Configuring LAN Emulation

Table Of Contents

Configuring LAN Emulation

LANE Functionality and Requirements

LANE Router and Switch Router Requirements

LANE Configuration Tasks

Creating a LANE Plan and Worksheet

Displaying LANE Default Addresses

Entering the ATM Address of the Configuration Server

Setting Up the Configuration Server Database

Enabling the Configuration Server

Setting Up LESs and Clients

Configuring a LAN Emulation Client on the ATM Switch Router

Configuring Fault-Tolerant Operation

Monitoring and Maintaining the LANE Components

LANE Configuration Examples

Default Configuration for a Single Emulated LAN

Default Configuration for a Single Emulated LAN with Backup LECS and LES on the ATM Switch Router

Default Configuration for a Token Ring ELAN with IP Source Routing (Catalyst 8510 MSR and LightStream 1010)

Configuring LAN Emulation

This chapter describes LAN emulation (LANE) and how to configure it on the ATM switch router.

Note This chapter provides advanced configuration instructions for the Catalyst 8540 MSR, Catalyst 8510 MSR, and LightStream 1010 ATM switch routers. For an overview of LANE architecture and operation, refer to the Guide to ATM Technology. For complete descriptions of the commands mentioned in this chapter, refer to the ATM Switch Router Command Reference publication. For a detailed description of LANE and its components, refer to Cisco IOS Switching Services Configuration Guide: Virtual LANs.

This chapter contains the following sections:

• LANE Functionality and Requirements

• LANE Configuration Tasks

• LANE Configuration Examples

LANE Functionality and Requirements

LANE uses ATM as a backbone to interconnect existing legacy LANs. In doing so, LANE allows legacy LAN users to take advantage of ATM's benefits without requiring modifications to end station hardware or software.

Multiple emulated LANs (ELANs), which are logically separated, can share the same physical ATM network and the same physical ATM interface. LANE makes an ATM interface look like one or more separate Ethernet or Token Ring interfaces.

LANE services provide connectivity between ATM-attached devices and LAN-attached devices. Two primary applications for the LANE protocol are as follows:

•Connectivity between LAN-attached stations across an ATM network, effectively extending LANs over a high-speed ATM transport backbone.

•Connectivity between ATM-attached hosts and LAN-attached hosts. Centralized hosts with high-speed ATM port adapters provide services, such as Domain Name System (DNS), to traditional LAN-attached devices.

Figure 13-1 illustrates the various connections LANE provides.

Figure 13-1 LANE Concept

Refer to the Guide to ATM Technology for the following background topics on LANE:

•How LANE works—the operation of LANE and the function of ATM network devices in LANE

•LANE components—the function of the server and client components that are required for LANE

•LANE virtual circuit connection (VCC) types—the role of each VCC type in establishing, maintaining, and tearing down LANE connections

•Addressing—the scheme used in automatically assigning ATM addresses to LANE components

•LANE examples—step-by-step process of joining an emulated LAN and building a LANE connection from a PC

LANE Router and Switch Router Requirements

You must manually configure Q.2931 over Signaling ATM Adaptation Layer (QSAAL) and ILMI signaling PVCs on routers and edge LAN switch routers to run LANE. However, these signaling permanent virtual channels (PVCs) are automatically configured on the ATM switch router.

Note The Catalyst 8510 MSR and LightStream 1010 processor and port adapters can be installed in slots 9 through 13 of the Catalyst 5500 switch. In this case, no physical connection is required between the ATM port adapter and the LANE card if the ATM Fabric Integration Module is used.

At least one ATM switch router is required to run LANE. For example, you cannot run LANE on routers connected back-to-back.

LANE Configuration Tasks

Before you begin to configure LANE, you must decide whether you want to set up one or multiple emulated LANs. If you set up multiple emulated LANs, you must also decide where the servers and clients will be located, and whether to restrict the clients that can belong to each emulated LAN. The procedure for configuring bridged emulated LANs is the same as for any other LAN.

To configure LANE, complete the tasks in the following sections:

• Creating a LANE Plan and Worksheet

• Displaying LANE Default Addresses

• Entering the ATM Address of the Configuration Server

• Setting Up the Configuration Server Database

Note For fault tolerance, multiple LANE services and servers can be assigned to the emulated LAN. This requires the use of our ATM switch routers and our ATM edge devices end-to-end.

• Enabling the Configuration Server

An ATM cloud can contain multiple configuration servers.

• Setting Up LESs and Clients

Every ELAN must have at least a LAN emulation server/broadcast-and unknown server (LES/BUS) pair, the maximum is 10. Every LANE cloud (one or multiple ELANs) must have at least one LAN emulation configuration server (LECS).

You can configure some emulated LANs with unrestricted membership and some emulated LANs with restricted membership. You can also configure a default emulated LAN, which must have unrestricted membership.

After LANE is configured, you can monitor and maintain the components, as described in the "Monitoring and Maintaining the LANE Components" section .

Creating a LANE Plan and Worksheet

Draw up a plan and a worksheet for your LANE scenario, containing the following information and leaving spaces for the ATM address of each LANE component on each subinterface of each participating router or switch router:

•The component and interface where the LECS will be located.

•The component, interface, and subinterface where the LES and BUS for each emulated LAN will be located. Each emulated LAN has multiple servers for fault-tolerant operation.

•The component, interfaces, and subinterfaces where the clients for each emulated LAN will be located.

•The component and database name of the default database.

•The name of the default emulated LAN (optional).

•The names of the emulated LANs that have unrestricted membership.

•The names of the emulated LANs that have restricted membership.

The last three items in this list are very important; they determine how you set up each emulated LAN in the configuration server database.

Automatic ATM Addressing and Address Templates for LANE Components

The ATM switch router automatically assigns ATM addresses to LANE components using the scheme described in the Guide to ATM Technology. You can also override the automatic address assignments using an ATM address template.

You can use ATM address templates in many LANE commands that assign ATM addresses to LANE components or that link client ATM addresses to emulated LANs. Using templates can greatly simplify the use of these commands.

Note E.164-format ATM addresses do not support the use of LANE ATM address templates.

LANE ATM address templates can use two types of wildcards: an asterisk (*) to match any single character, and an ellipsis (...) to match any number of leading or trailing characters.

In LANE, a prefix template explicitly matches the prefix but uses wildcards for the end station interface (ESI) and selector fields. An ESI template explicitly matches the ESI field but uses wildcards for the prefix and selector fields. Table 13-1 shows how the values of unspecified digits are determined when an ATM address template is used.

Table 13-1 Values of Unspecified Digits in ATM Address Templates

Unspecified Digits In

Value Is

Prefix (first 13 bytes)

Obtained from ATM switch router via Integrated Local Management Interface (ILMI)

ESI (next 6 bytes)

Filled with the slot MAC address¹ plus

•0—LANE Client (LEC)

•1—LANE Server (LES)

•2—LANE broadcast-and-unknown server (BUS)

•3—LANE Configuration Server (LECS)

Selector field (last 1 byte)

Subinterface number, in the range 0 through 255

¹The lowest MAC addresses in the pool addresses assigned to the ATM interface plus a value that indicates the LANE component.

Rules for Assigning Components to Interfaces and Subinterfaces

The following rules apply to assigning LANE components to the major ATM interface and its subinterfaces:

•The LECS always runs on the major interface.

The assignment of any other component to the major interface is identical to assigning that component to the 0 subinterface.

•The server and the client of the same emulated LAN can be configured on the same subinterface.

•Clients of two different emulated LANs cannot be configured on the same subinterface.

•Servers of two different emulated LANs cannot be configured on the same subinterface.

Note On the ATM switch router, LANE components can be configured only on the multiservice route processor interface or on one of its subinterfaces.

Example LANE Plan and Worksheet

This section is an example of the LANE plan and worksheet that would be created for the example network configuration described in the "Default Configuration for a Single Emulated LAN" section .

Note This example configures LANE on the route processor interface (ATM 0), rather than an ATM router module interface. For LANE client configuration examples on ATM router module interfaces, refer to "Configuring LECs on ATM Router Module Interfaces (Catalyst 8540 MSR)" section .

Figure 13-2 shows the single emulated LAN example network.

Figure 13-2 LANE Plan Example Network

The following information describes the LANE plan in Figure 13-2:

•LECS:
—Location: ATM_Switch
—Interface: atm 0
—ATM address: 47.00918100000000E04FACB401.00E04FACB405.00

•LES:
—Location: Switch_1
—Interface/Subinterface: atm 0.1
—Type: Ethernet
—ATM address: 47.00918100000000E04FACB401.00E04FACB403.01

•BUS:
—Location: Switch_1
—Interface/Subinterface: atm 0.1
—Type: Ethernet
—ATM address: "use default"

•Database:
—Location: ATM_Switch
—Name: eng_dbase
—ELAN name: eng_elan
—Default ELAN name: eng_elan
—ATM address: 47.00918100000000E04FACB401.00E04FACB403.01

•LANE Client:
—Location: ATM_Switch
—Interface/Subinterface: atm 0.1
—Server/BUS name: eng_elan
—IP Address/Subnet mask: 172.16.0.4 255.255.0.0
—Type: Ethernet

•LANE Client:
—Location: Switch_1
—Interface/Subinterface: atm 0.1
—Server/BUS name: eng_elan
—Type: Ethernet

•LANE Client:
—Location: Router_1
—Interface/Subinterface: atm 3/0.1
—Server/BUS name: eng_elan
—IP Address/Subnet mask: 172.16.0.1 255.255.0.0
—Type: Ethernet

Note Virtual LANs (VLANs) need to be configured on the LAN edge switches. These VLANs must be mapped to the appropriate ELANs.

Continue with the following sections to start configuring LANE on your ATM network.

Displaying LANE Default Addresses

To make configuration easier, you should display the LANE default addresses for each router or switch router that is running any of the LESs or services and write down the displayed addresses on your worksheet.

To display the default LANE addresses, use the following EXEC command:

Command

Purpose

show lane default-atm-addresses

Displays the LANE default addresses for all ATM interfaces present on the router or switch router.

Example

The following example displays the default LANE addresses:
Switch# show lane default-atm-addressesinterface ATM13/0/0:LANE Client: 47.00918100000000E04FACB401.00E04FACB402.**LANE Server: 47.00918100000000E04FACB401.00E04FACB403.**LANE Bus: 47.00918100000000E04FACB401.00E04FACB404.**LANE Config Server: 47.00918100000000E04FACB401.00E04FACB405.00note: ** is the subinterface number byte in hex
Entering the ATM Address of the Configuration Server

You must enter the configuration server ATM address into the ATM switch routers and save it permanently, so that the value is not lost when the device is reset or powered off. The configuration server address can be specified for all of the ATM switch routers, or per port.

To enter the configuration server addresses for all of the ATM switch routers, perform the following steps in global configuration mode:

Command

Purpose

Step 1

Switch(config)# atm lecs-address-default lecsaddress

Specifies the LECS ATM address for all of the ATM switch routers.

Step 2

Switch(config)# end

Switch#

Exits configuration mode.

Step 3

Switch# copy system:running-config nvram:startup-config

Saves the configuration.

For examples of these commands, see the "LANE Configuration Examples" section .

Setting Up the Configuration Server Database

After you have determined all LESs, BUSs, and LECS on all ATM subinterfaces on all routers and switch routers that will participate in LANE, and have displayed their ATM addresses, you can use the information to populate the configuration server's database.

You can set up a default emulated LAN, whether or not you set up any other emulated LANs. You can also set up some emulated LANs with restricted membership and others with unrestricted membership.

To set up the LANE database, complete the tasks in the following subsections as appropriate for your emulated LAN plan and scenario. To set up fault-tolerant operation, see the "Configuring Fault-Tolerant Operation" section .

Setting Up the Database for the Default Emulated LAN Only

When you configure a router as the LECS for one default emulated LAN, you provide the following information:

•A name for the database

•The ATM address of the server for the emulated LAN

•The ring number of the emulated LAN for Token Ring (Catalyst 8510 MSR and LightStream 1010)

•A default name for the emulated LAN

When you set up a database of only a default unrestricted emulated LAN, you do not have to specify where the LANE clients are located. That is, when you set up the configuration servers database for a single default emulated LAN, you do not have to provide any database entries that link the ATM addresses of any clients with the emulated LAN name.

To set up the LECS for the default emulated LAN, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# lane database database-name

Switch(lane-config-database)#

Creates a named database for the LECS.

Step 2

Switch(lane-config-database)# name elan-name server-atm-address atm-address [index n]

In the configuration database, binds the name of the emulated LAN to the ATM address of the LES.

Step 3

Switch(lane-config-database)# name elan-name local-seg-id seg-num

(Token Ring only.) In the configuration database, specifies the ring number for the emulated LAN. (Catalyst 8510 MSR and LightStream 1010)

Step 4

Switch(lane-config-database)# default-name elan-name

In the configuration database, assigns an emulated LAN to the LECS trying to join without specifying an ELAN name.

In Step 2, enter the ATM address of the server for the specified emulated LAN, as noted in your worksheet and obtained in the "Displaying LANE Default Addresses" section . You can have any number of servers per emulated LAN for fault tolerance. Entry order determines priority: the first entry has the highest priority unless you override it with the index option.

If you are setting up only a default emulated LAN, the elan-name value in Step 2 is the same as the default emulated LAN name you provide in Step 4.

To set up fault-tolerant operation, see the "Configuring Fault-Tolerant Operation" section .

For examples of these commands, see the "LANE Configuration Examples" section .

Setting Up the Database for Unrestricted-Membership Emulated LANs

When you set up a database for unrestricted emulated LANs, you create database entries that link the name of each emulated LAN to the ATM address of its server.

However, you can choose not to specify the locations of the LANE clients. That is, when you set up the configuration server database, you do not have to provide any database entries that link the ATM addresses or media access control (MAC) addresses of any clients with the emulated LAN name.

To configure a router or switch router as the LECS for multiple emulated LANs with unrestricted membership, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# lane database database-name

Switch(lane-config-database)#

Creates a named database for the LECS.

Step 2

Switch(lane-config-database)# name elan-name1 server-atm-address atm-address [index n]

In the configuration database, binds the name of the first emulated LAN to the ATM address of the LES for that emulated LAN.

Step 3

Switch(lane-config-database)# name elan-name1 local-seg-id seg-num

(Token Ring only.) In the configuration database, specifies the ring number for the first emulated LAN. (Catalyst 8510 MSR and LightStream 1010)

Step 4

Switch(lane-config-database)# name elan-name2 server-atm-address atm-address [index n]

In the configuration database, binds the name of the second emulated LAN to the ATM address of the LES.

Repeat this step, providing a different emulated LAN name and an ATM address, for each additional emulated LAN in this switch cloud.

Step 5

Switch(lane-config-database)# name elan-name2 local-seg-id seg-num

(Token Ring only) In the configuration database, specifies the ring number for the second emulated LAN. (Catalyst 8510 MSR and LightStream 1010)

Repeat this step for each additional Token Ring emulated LAN.

Step 6

Switch(lane-config-database)# default name elan-name1

Specifies a default emulated LAN for LANE clients not explicitly bound to an emulated LAN. (Optional)

In Steps 2 and 4, enter the ATM address of the server for the specified emulated LAN, as noted in your worksheet and obtained in the "Displaying LANE Default Addresses" section .

To set up fault-tolerant operation, see the "Configuring Fault-Tolerant Operation" section .

For examples of these commands, see the "LANE Configuration Examples" section .

Setting Up the Database for Restricted-Membership Emulated LANs

When you set up the database for restricted-membership emulated LANs, you create database entries that link the name of each emulated LAN to the ATM address of its server. However, you also must specify where the LANE clients are located. That is, for each restricted-membership emulated LAN, you provide a database entry that explicitly links the ATM address or MAC address of each client of that emulated LAN with the name of that emulated LAN.

When clients for the same restricted-membership emulated LAN are located in multiple routers, each client's ATM address or MAC address must be linked explicitly with the name of the emulated LAN. As a result, you must configure as many client entries (See Step 7 in the following procedure) as you have clients for emulated LANs in all the routers. Each client will have a different ATM address in the database entries.

To set up the configuration server for emulated LANs with restricted membership, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# lane database database-name

Switch(lane-config-database)#

Creates a named database for the LECS.

Step 2

Switch(lane-config-database)# name elan-name1 server-atm-address atm-address [index n]

In the configuration database, binds the name of the first emulated LAN to the ATM address of the LES for that emulated LAN.

Step 3

Switch(lane-config-database)# name elan-name1 local-seg-id seg-num

(Token Ring only) In the configuration database, specifies the ring number for the first emulated LAN. (Catalyst 8510 MSR and LightStream 1010)

Step 4

Switch(lane-config-database)# name elan-name2 server-atm-address atm-address [index n]

In the configuration database, binds the name of the second emulated LAN to the ATM address of the LES.

Repeat this step, providing a different name and a different ATM address for each additional emulated LAN.

Step 5

Switch(lane-config-database)# name elan-name2 local-seg-id seg-num

(Token Ring only.) In the configuration database, specifies the ring number for the second emulated LAN. (Catalyst 8510 MSR and LightStream 1010)

Repeat this step for each additional Token Ring emulated LAN.

Step 6

Switch(lane-config-database)# default-name elan-name1

(Optional.) Specifies a default emulated LAN for LANE clients not explicitly bound to an emulated LAN.

Step 7

Switch(lane-config-database)# client-atm-address atm-address-template name elan-name

Adds a database entry associating a specific client's ATM address with a specific restricted-membership emulated LAN.

Repeat this step for each client of each restricted-membership emulated LANs on this switch cloud, in each case specifying that client's ATM address and the name of the emulated LAN with which it is linked.

To set up fault-tolerant operation, see the "Configuring Fault-Tolerant Operation" section .

Enabling the Configuration Server

After you create the database entries appropriate to the type and to the membership conditions of the emulated LANs, you enable the configuration server on the selected ATM interface, router, or switch router, and specify that the configuration server's ATM address is to be computed automatically.

To enable the configuration server, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# interface atm 0[.subinterface#]

Switch(config-if)#

If you are not currently configuring the interface, specifies the major ATM interface where the configuration server is located.

Step 2

Switch(config-if)# lane config database database-name

Links the configuration server's database name to the specified major interface, and enables the configuration server.

Step 3

Switch(config-if)# lane config auto-config-atm-address

Specifies that the configuration server's ATM address will be computed by our automatic method.

For examples of these commands, see the "LANE Configuration Examples" section .

Note Since the 12.0(1a)W5(5b) release of the system software, addressing the interface on the Catalyst 8510 MSR and LightStream 1010 processor card has changed. The ATM interface is now called atm0, and the Ethernet interface is now called ethernet0. The old formats (atm 2/0/0 and ethernet 2/0/0) are still supported.

Setting Up LESs and Clients

For each device that participates in LANE, set up the necessary servers and clients for each emulated LAN; then display and record the server and client ATM addresses. Be sure to keep track of the router or switch router interface where the LECS will be located.

For one default emulated LAN, you must set up one set of servers: one as a primary server and the rest as backup servers for the same emulated LAN. For multiple emulated LANs, you can set up servers for another emulated LAN on a different subinterface or on the same interface of this router or switch router, or you can place the servers on a different router.

When you set up a server and BUS on a router, you can combine them with a client on the same subinterface, a client on a different subinterface, or no client at all on the router.

Where you put the clients is important, because any router with clients for multiple emulated LANs can route frames between those emulated LANs.

Note For Token Ring LANE environments that source-route bridge IP traffic to the ATM switch routers, multiring must be configured to enable Routing Information Field (RIF) packets. For an example, see the "Default Configuration for a Token Ring ELAN with IP Source Routing (Catalyst 8510 MSR and LightStream 1010)" section .

Setting Up the Server, BUS, and a Client on a Subinterface

To set up the server, BUS, and (optionally) clients for an emulated LAN, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# interface atm 0.subinterface#

Switch(config-subif)#

Specifies the subinterface for the first emulated LAN on this router.

Step 2

Switch(config-subif)# lane server-bus {ethernet | tokenring} elan-name1

Enables a LES and a LANE BUS for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)

Step 3

Switch(config-subif)# lane client {ethernet | tokenring} [elan-name1]

(Optional.) Enables a LANE client for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)

Step 4

Switch(config-subif)# ip address ip-address mask

Provides a protocol address for the client.

If the emulated LAN in Step 2 will have restricted membership, consider carefully whether you want to specify its name here. You will specify the name in the LECS's database when it is set up. However, if you link the client to an emulated LAN, and by some mistake it does not match the database entry linking the client to an emulated LAN, this client will not be allowed to join this or any other emulated LAN.

If you do decide to include the name of the emulated LAN linked to the client in Step 3 and later want to associate that client with a different emulated LAN, make the change in the configuration server's database before you make the change for the client on this subinterface.

Each emulated LAN is a separate subnetwork. In Step 4, make sure that the clients of the same emulated LAN are assigned protocol addresses on the same subnetwork, and that clients of different emulated LANs are assigned protocol addresses on different subnetworks.

For examples of these commands, see the "LANE Configuration Examples" section .

Setting Up a Client on a Subinterface

On any given router or switch router, you can set up one client for one emulated LAN or multiple clients for multiple emulated LANs without a server and BUS. You can set up a client for a given emulated LAN on any routers you select to participate in that emulated LAN. Any router with clients for multiple emulated LANs can route packets among those emulated LANs.

To set up a client for an emulated LAN, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# interface atm 0.subinterface#

Switch(config-subif)#

or

Switch(config)# interface atm card/subcard/port.subinterface#

Switch(config-subif)#

Specifies the route processor subinterface number for an emulated LAN on this router.

If you are using the optional ATM router module, specifies the ATM subinterface number. (Catalyst 8540 MSR)

Step 2

Switch(config-subif)# ip address ip-address

Provides a protocol address for the client on this subinterface.

Step 3

Switch(config-subif)# lane client {ethernet | tokenring} elan-name1

Enables a LANE client for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)

Note To route traffic between an emulated LAN and a Fast Ethernet (FE) or Gigabit Ethernet (GE) interface, you must configure the LANE client on an ATM router module interface rather than a route processor interface.

Each emulated LAN is a separate subnetwork. In Step 2, make sure that the clients of the same emulated LAN are assigned protocol addresses on the same subnetwork, and that clients of different emulated LANs are assigned protocol addresses on different subnetworks.

Note For Token Ring LANE environments that source-route bridge IP traffic to the ATM switch routers, multiring must be configured to enable Routing Information Field (RIF) packets. For an example, see the "Default Configuration for a Token Ring ELAN with IP Source Routing (Catalyst 8510 MSR and LightStream 1010)" section .

Example (Catalyst 8540 MSR)

The following example shows how to configure a client for emulated LAN on an ATM router module subinterface:
Switch(config)# interface atm 10/0/1.1Switch(config-if)# ip address 172.16.4.0 255.255.0.0Switch(config-if)# lane client ethernet elan_1205

For additional examples of these commands, see the "LANE Configuration Examples" section .

Configuring a LAN Emulation Client on the ATM Switch Router

This section explains how to configure a LANE client connection from the ATM switch router in the headquarters building to the route processor interface (or optional ATM router module interface on the Catalyst 8540 MSR) of the ATM switch router.

Note This connection can be used for switch router management only.

A route processor (or optional ATM router module interface) configured as a LANE client allows you to configure the ATM switch router from a remote host.

Configuring an Ethernet LANE Client

To configure the route processor interface (or optional ATM router module interface on the Catalyst 8540 MSR) as an Ethernet LANE client on the ATM switch router, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# atm lecs-address lecsaddress

Specifies the address to the LECS.

Step 2

Switch(config)# interface atm 0[.subinterface#]

Switch(config-if)#

or

Switch(config)# interface atm card/subcard/port[.subinterface#]

Switch(config-if)#

Specifies the route processor interface.

If you are using the optional ATM router module, specifies the ATM interface number. (Catalyst 8540 MSR)

Step 3

Switch(config-if)# lane client-atm-address atm-address-template

Specifies an ATM address, and overrides the automatic ATM address assignment for the LANE client.

Step 4

Switch(config-if)# lane client ethernet [elan-name]

Configures a LANE client on the specified subinterface.

Note To route traffic between an emulated LAN and a Fast Ethernet (FE) or Gigabit Ethernet (GE) interface, you must configure the LANE client on an ATM router module interface rather than a route processor interface.

Example

The following example shows how to specify the LANE configuration server (LECS) address and configure a LANE client on the route processor interface to emulate an Ethernet connection using the automatic ATM address assignment:
Switch(config)# atm lecs-address 47.0091.0000.0000.0000.0000.0000.0000.00Switch(config)# interface atm 0Switch(config-if)# lane client ethernet eng_elan

For additional examples of these commands, see the "LANE Configuration Examples" section . For LANE client configuration examples on ATM router module interfaces, refer to "Configuring LECs on ATM Router Module Interfaces (Catalyst 8540 MSR)" section .

Configuring Fault-Tolerant Operation

The LANE simple server redundancy feature creates fault tolerance using standard LANE protocols and mechanisms. If a failure occurs on the LECS or on the LES/BUS, the emulated LAN can continue to operate using the services of a backup LES. This protocol is called the Simple Server Redundancy Protocol (SSRP).

For a detailed description of SSRP for LANE, refer to the Guide to ATM Technology.

Enabling Redundant LECSs and LES/BUSs

To enable fault tolerance, you enable multiple, redundant, and standby LECSs and multiple, redundant, and standby LES/BUSs. This allows the connected LANE components to obtain the global list of LECS addresses. Our LANE continues to operate seamlessly with other vendors' LANE components, but fault tolerance is not effective when other vendors' LANE components are present.

To configure multiple LES/BUSs for emulated LANs on the routers or switch routers, perform the following steps, beginning in global configuration mode:

Command

Purpose

Step 1

Switch(config)# lane database database-name

Switch(lane-config-database)#

Creates a named database for the LECS.

Step 2

Switch(lane-config-database)# name elan-name server-atm-address address index n

Specifies redundant LES/BUSs, or simple server replication. Enter the command for each LES address for the same emulated LAN. The index determines the priority. The 0 is the highest priority.

Step 3

Switch(lane-config-database)# lane client {ethernet | tokenring} elan-name

Enables a LANE client for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)

Server redundancy guards against the failure of the hardware on which LES components are running. This includes all the ATM interface cards in our routers and Catalyst switches. Fault tolerance is not effective for ATM network or switch router failures.

Caution For server redundancy to work correctly, all ATM switch routers must have identical lists of the global LECS addresses, in the identical priority order. The operating LECSs must use exactly the same configuration database.

Load the configuration table data using the configure network command. This method minimizes errors and enables the database to be maintained centrally in one place.

For examples of these commands, see the "LANE Configuration Examples" section .

Implementation Considerations

For important considerations when implementing SSRP, refer to the LANE discussion in the Guide to ATM Technology.

Caution You can override the LECS address on any subinterface by using the lane auto-config-atm-address, lane fixed-config-atm-address, and lane config-atm-address commands. When you perform an override using one of these commands, however, fault-tolerant operation cannot be guaranteed. To avoid affecting the fault-tolerant operation, do not override any LECS, LES, or BUS addresses.

Monitoring and Maintaining the LANE Components

After configuring LANE components on an interface or any of its subinterfaces, on a specified subinterface, or on an emulated LAN, you can display their status. To show LANE information, use the following EXEC commands:

Command

Purpose

show lane [interface atm card/subcard/port[.subinterface#] |
name elan-name] [brief]

Displays the global and per-virtual channel connection LANE information for all the LANE components and emulated LANs configured on an interface or any of its subinterfaces.

show lane bus [interface atm
card/subcard/port[.subinterface#] |
name elan-name] [brief]

Displays the global and per-VCC LANE information for the BUS configured on any subinterface or emulated LAN.

show lane client [interface atm card/subcard/port[.subinterface#] |
name elan-name] [brief]

Displays the global and per-VCC LANE information for all LANE clients configured on any subinterface or emulated LAN.

show lane config [interface atm
card/subcard/port[.subinterface#]]

Displays the global and per-VCC LANE information for the configuration server configured on any interface.

show lane database [name]

Displays the LECS's database.

show lane le-arp [interface atm
card/subcard/port[.subinterface#] |
name elan-name]

Displays the LANE ARP table of the LANE client configured on the specified subinterface or emulated LAN.

show lane server [interface atm
card/subcard/port[.subinterface#] |
name elan-name] [brief]

Displays the global and per-VCC LANE information for the LES configured on a specified subinterface or emulated LAN.

LANE Configuration Examples

The examples in the following sections illustrate how to configure LANE for the following cases:

•Default configuration for a single emulated LAN with a LANE client on the ATM switch router

•Default configuration for a single emulated LAN with a backup LECS and LES on the ATM switch router

•Default configuration for a single emulated Token Ring LAN using IP source routing across a source-route bridged network with a LANE client on the ATM switch router

All examples use the automatic ATM address assignment method described in the "Automatic ATM Addressing and Address Templates for LANE Components" section .

These examples show the LANE configurations, not the process of determining the ATM addresses and entering them.

Note For LANE client configuration examples on ATM router module interfaces, refer to "Configuring LECs on ATM Router Module Interfaces (Catalyst 8540 MSR)" section .

Default Configuration for a Single Emulated LAN

The following examples show how to configure one Cisco 7505 router, one ATM switch, and one Catalyst 5500 switch for a single emulated LAN. Configurations for both Ethernet and Token Ring emulated LANs are shown.

The ATM switch contains the LECS, LES, BUS, and an LEC. The router and Catalyst 5500 switch each contain an LEC for the emulated LAN. This example uses all LANE default settings. For example, it does not explicitly set ATM addresses for the different LANE components that are colocated on the ATM switch. Membership in this emulated LAN is not restricted (see Figure 13-3).

Figure 13-3 Single Emulated LAN Example Network

Ethernet Example

ATM Switch
ATM_Switch# show lane default-atm-addressesinterface ATM13/0/0:LANE Client: 47.00918100000000E04FACB401.00E04FACB402.**LANE Server: 47.00918100000000E04FACB401.00E04FACB403.**LANE Bus: 47.00918100000000E04FACB401.00E04FACB404.**LANE Config Server: 47.00918100000000E04FACB401.00E04FACB405.00note: ** is the subinterface number byte in hex
ATM_Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM_Switch(config)# atm lecs-address-default 47.00918100000000E04FACB401.00E04FACB405.00ATM_Switch(config)# endATM_Switch#ATM_Switch# copy system:running-config nvram:startup-configBuilding configuration...[OK]ATM_Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM_Switch(config)# lane database eng_dbaseATM_Switch(lane-config-database)# name eng_elan server-atm-address 47.00918100000000E04FACB401.00E04FACB403.01ATM_Switch(lane-config-database)# default-name eng_elanATM_Switch(lane-config-database)# endATM_Switch# show lane database
LANE Config Server database table 'eng_dbase'default elan: eng_elanelan 'eng_elan': un-restrictedserver 47.00918100000000E04FACB401.00E04FACB403.01 (prio 0)
ATM_Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM_Switch(config)# interface atm 0ATM_Switch(config-if)# lane config database eng_dbaseATM_Switch(config-if)# lane config auto-config-atm-addressATM_Switch(config-if)# exitATM_Switch(config)# endATM_Switch# show lane configLE Config Server ATM13/0/0 config table: eng_dbaseAdmin: up State: operationalLECS Mastership State: active masterlist of global LECS addresses (42 seconds to update):47.00918100000000E04FACB401.00E04FACB405.00 <-------- meATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)cumulative total number of unrecognized packets received so far: 0cumulative total number of config requests received so far: 0cumulative total number of config failures so far: 0
ATM_Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM_Switch(config)# interface atm 0.1ATM_Switch(config-subif)# lane server-bus ethernet eng_elanATM_Switch(config-subif)# ip address 172.16.0.4 255.255.0.0ATM_Switch(config-subif)# end
ATM_Switch# show laneLE Config Server ATM13/0/0 config table: eng_dbaseAdmin: up State: operationalLECS Mastership State: active masterlist of global LECS addresses (46 seconds to update):47.00918100000000E04FACB401.00E04FACB405.00 <-------- meATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)vcd rxCnt txCnt callingParty82 0 0 47.00918100000000E04FACB401.00E04FACB403.01 LES eng_elan 0 activecumulative total number of unrecognized packets received so far: 0cumulative total number of config requests received so far: 0cumulative total number of config failures so far: 0
LE Server ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operationaltype: ethernet Max Frame Size: 1516ATM address: 47.00918100000000E04FACB401.00E04FACB403.01LECS used: 47.00918100000000E04FACB401.00E04FACB405.00 connected, vcd 81
LE BUS ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operationaltype: ethernet Max Frame Size: 1516ATM address: 47.00918100000000E04FACB401.00E04FACB404.01
ATM_Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM_Switch(config)# interface atm 0.1ATM_Switch(config-subif)# lane client ethernet eng_elanATM_Switch(config-subif)# endATM_Switch# show lane clientLE Client ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operationalClient ID: 1 LEC up for 30 secondsELAN ID: 0Join Attempt: 1HW Address: 00e0.4fac.b402 Type: ethernet Max Frame Size: 1516ATM Address: 47.00918100000000E04FACB401.00E04FACB402.01
VCD rxFrames txFrames Type ATM Address0 0 0 configure 47.00918100000000E04FACB401.00E04FACB405.0087 1 2 direct 47.00918100000000E04FACB401.00E04FACB403.0190 1 0 distribute 47.00918100000000E04FACB401.00E04FACB403.0191 0 1 send 47.00918100000000E04FACB401.00E04FACB404.0194 0 0 forward 47.00918100000000E04FACB401.00E04FACB404.01
ATM_Switch# copy system:running-config nvram:startup-configBuilding configuration...[OK]ATM_Switch#

Note The ELAN ID shown in the above show lane client command display is relevant only for LANE version 2-capable clients. The ELAN ID is configured with either the name elan-name command in database configuration mode, or the lane server-bus command in subinterface configuration mode.

Router 1
router1# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router1(config)# interface atm 3/0router1(config-if)# atm pvc 1 0 5 qsaalrouter1(config-if)# atm pvc 2 0 16 ilmirouter1(config-if)# interface atm 3/0.1router1(config-subif)# ip address 172.16.0.1 255.255.0.0router1(config-subif)# lane client ethernet eng_elanrouter1(config-subif)# endrouter1# more system:running-configBuilding configuration...
Current configuration:!version 11.1
<Information deleted>
!interface ATM3/0no ip addressatm pvc 1 0 5 qsaalatm pvc 2 0 16 ilmi!interface ATM3/0.1 midpointlane client ethernet eng_elan!
<information deleted>
!end
router1# show interfaces atm 3/0.1ATM3/0.1 is up, line protocol is upHardware is Caxias ATMMTU 1500 bytes, BW 156250 Kbit, DLY 80 usec, rely 255/255, load 1/255Encapsulation ATM-LANEARP type: ARPA, ARP Timeout 04:00:00router1#
Catalyst 5500 Switch 1
Switch1> session 4Trying ATM-4...Connected to ATM-4.Escape character is '^]'.ATM> enableATM# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM(config)# interface atm 0ATM(config-if)# lane server-bus ethernet eng_elanATM(config-if)# endATM# copy system:running-config nvram:startup-configBuilding configuration...[OK]ATM# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM(config)# interface atm 0ATM(config-if)# atm pvc 1 0 5 qsaalATM(config-if)# atm pvc 2 0 16 ilmiATM(config-if)# endATM#ATM# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM(config)# interface atm 0.1ATM(config-subif)# lane client ethernet 1 eng_elanATM(config-subif)# endATM# show lane clientLE Client ATM0.1 ELAN name: eng_elan Admin: up State: operationalClient ID: 3 LEC up for 24 secondsJoin Attempt: 11HW Address: 00e0.4fac.b030 Type: ethernet Max Frame Size: 1516 VLANID: 1ATM Address: 47.00918100000000E04FACB401.00E04FACB030.01
VCD rxFrames txFrames Type ATM Address0 0 0 configure 47.00918100000000E04FACB401.00E04FACB405.0027 1 14 direct 47.00918100000000E04FACB401.00E04FACB403.0129 13 0 distribute 47.00918100000000E04FACB401.00E04FACB403.0130 0 15 send 47.00918100000000E04FACB401.00E04FACB404.0131 0 0 forward 47.00918100000000E04FACB401.00E04FACB404.01
ATM# copy system:running-config nvram:startup-configBuilding configuration...[OK]ATM#
Confirming Connectivity between the ATM Switch and Other LANE Members

The following example shows how to use the show lane and ping commands to confirm the connection between the ATM switch, routers, and LAN switches.

ATM Switch
Switch# show laneLE Config Server ATM13/0/0 config table: eng_dbaseAdmin: up State: operationalLECS Mastership State: active masterlist of global LECS addresses (31 seconds to update):47.00918100000000E04FACB401.00E04FACB405.00 <-------- meATM Address of this LECS: 47.00918100000000E04FACB401.00E04FACB405.00 (auto)vcd rxCnt txCnt callingParty82 2 2 47.00918100000000E04FACB401.00E04FACB403.01 LES eng_elan 0 activecumulative total number of unrecognized packets received so far: 0cumulative total number of config requests received so far: 4cumulative total number of config failures so far: 0
LE Server ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operationaltype: ethernet Max Frame Size: 1516ATM address: 47.00918100000000E04FACB401.00E04FACB403.01LECS used: 47.00918100000000E04FACB401.00E04FACB405.00 connected, vcd 81control distribute: vcd 89, 2 members, 2 packets
proxy/ (ST: Init, Conn, Waiting, Adding, Joined, Operational, Reject, Term)lecid ST vcd pkts Hardware Addr ATM Address1 O 88 2 00e0.4fac.b402 47.00918100000000E04FACB401.00E04FACB402.012 O 96 2 0080.1c93.8060 47.00918100000000E04FACB401.00801C938060.01
LE BUS ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operationaltype: ethernet Max Frame Size: 1516ATM address: 47.00918100000000E04FACB401.00E04FACB404.01data forward: vcd 93, 2 members, 95 packets, 0 unicasts
lecid vcd pkts ATM Address1 92 95 47.00918100000000E04FACB401.00E04FACB402.012 97 42 47.00918100000000E04FACB401.00801C938060.01
LE Client ATM13/0/0.1 ELAN name: eng_elan Admin: up State: operationalClient ID: 1 LEC up for 1 hour 34 minutes 46 secondsELAN ID: 0Join Attempt: 1HW Address: 00e0.4fac.b402 Type: ethernet Max Frame Size: 1516ATM Address: 47.00918100000000E04FACB401.00E04FACB402.01
VCD rxFrames txFrames Type ATM Address0 0 0 configure 47.00918100000000E04FACB401.00E04FACB405.0087 1 2 direct 47.00918100000000E04FACB401.00E04FACB403.0190 2 0 distribute 47.00918100000000E04FACB401.00E04FACB403.0191 0 95 send 47.00918100000000E04FACB401.00E04FACB404.0194 42 0 forward 47.00918100000000E04FACB401.00E04FACB404.01
ATM_Switch# ping 172.16.0.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 msATM_Switch# ping 172.16.0.3Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.0.2, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 ms
Token Ring Example (Catalyst 8510 MSR and LightStream 1010)

In this Token Ring example, the Cisco 7505 router contains the LECS, LES, BUS, and an LEC. The ATM switch router and Catalyst 5500 Fast Ethernet switch each contain an LEC for the emulated LAN. This example uses all LANE default settings. For example, it does not explicitly set ATM addresses for the different LANE components that are co-located on the router. Membership in this emulated LAN is not restricted.

Router 1
router1# show lane default-atm-addressesinterface ATM3/0:LANE Client: 47.00918100000000603E7B2001.00000C407572.**LANE Server: 47.00918100000000603E7B2001.00000C407573.**LANE Bus: 47.00918100000000603E7B2001.00000C407574.**LANE Config Server: 47.00918100000000603E7B2001.00000C407575.00note: ** is the subinterface number byte in hex
ATM Switch
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# atm lecs-address-default 47.00918100000000603E7B2001.00000C407575.00Switch(config)# endSwitch#
Router 1
router1# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router1(config)# lane database eng_dbaserouter1(lane-config-database)# name eng_elan server-atm-address 47.00918100000000603E7B2001.00000C407573.01router1(lane-config-database)# name eng_elan local-seg-id 2048router1(lane-config-database)# default-name eng_elanrouter1(lane-config-database)# exitrouter1(config)# interface atm0router1(config-if)# atm pvc 1 0 5 qsaalrouter1(config-if)# atm pvc 2 0 16 ilmirouter1(config-if)# lane config auto-config-atm-addressrouter1(config-if)# lane config database eng_dbaserouter1(config-if)#%LANE-5-UPDOWN: ATM0 database example1: LE Config Server (LECS) changed state to uprouter1(config-if)# interface atm3/0.1router1(config-subif)# ip address 172.16.0.1 255.255.0.0router1(config-subif)# lane server-bus tokenring eng_elanrouter1(config-subif)# lane client tokenring eng_elanrouter1(config-subif)#%LANE-5-UPDOWN: ATM0.1 elan eng: LE Client changed state to uprouter1(config-subif)# endrouter1#
Catalyst 5000 Switch 1
Switch1> session 4Trying ATM-4...Connected to ATM-4.Escape character is '^]'.ATM> enableATM# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM(config)# interface atm 0ATM(config-if)# lane server-bus tokenring eng_elanATM(config-if)# endATM# copy system:running-config nvram:startup-configBuilding configuration...[OK]ATM# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM(config)# interface atm 0ATM(config-if)# atm pvc 1 0 5 qsaalATM(config-if)# atm pvc 2 0 16 ilmiATM(config-if)# endATM#ATM# configure terminalEnter configuration commands, one per line. End with CNTL/Z.ATM(config)# interface atm 0.1ATM(config-subif)# lane client tokenring 1 eng_elanATM(config-subif)# endATM#
ATM Switch
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface atm 0.1Switch(config-subif)# ip address 172.16.0.4 255.255.0.0Switch(config-subif)# lane client tokenring eng_elanSwitch(config-subif)#%LANE-5-UPDOWN: ATM13/0/0.1 elan : LE Client changed state to upSwitch(config-subif)# endSwitch#
Confirming Connectivity between the ATM switch and the Routers

The following example shows how to use the ping command to confirm the connection between the ATM switch and routers:
ATM_Switch# ping 172.16.0.1Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.0.1, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 msATM_Switch# ping 172.16.0.3Type escape sequence to abort.Sending 5, 100-byte ICMP Echos to 172.16.0.3, timeout is 2 seconds:!!!!!Success rate is 100 percent (5/5), round-trip min/avg/max = 1/202/1000 ms
Displaying the LANE Client Configuration on the ATM switch

The following example shows the show lane client command display for the Ethernet LANE client in the ATM switch:
ATM_Switch# show lane clientLE Client ATM13/0/0.1 ELAN name: eng Admin: up State: operationalClient ID: 3 LEC up for 4 minutes 58 secondsJoin Attempt: 1HW Address: 0060.3e7b.2002 Type: ethernet Max Frame Size: 1516ATM Address: 47.00918100000000603E7B2001.00603E7B2002.01VCD rxFrames txFrames Type ATM Address0 0 0 configure 47.00918100000000603E7B2001.00000C407575.0052 1 4 direct 47.00918100000000603E7B2001.00000C407573.0153 9 0 distribute 47.00918100000000603E7B2001.00000C407573.0154 0 13 send 47.00918100000000603E7B2001.00000C407574.0155 19 0 forward 47.00918100000000603E7B2001.00000C407574.0156 11 10 data 47.00918100000000603E7B2001.00000C407572.0157 6 5 data 47.00918100000000603E7B2001.00000C407C02.02

The following example shows the show lane client command display for the Token Ring LANE client in the ATM switch router:
ATM_Switch# show lane clientLE Client ATM13/0/0.1 ELAN name: eng Admin: up State: operationalClient ID: 3 LEC up for 4 minutes 58 secondsJoin Attempt: 1HW Address: 0060.3e7b.2002 Type: token ring Max Frame Size: 4544ATM Address: 47.00918100000000603E7B2001.00603E7B2002.01VCD rxFrames txFrames Type ATM Address0 0 0 configure 47.00918100000000603E7B2001.00000C407575.0052 1 4 direct 47.00918100000000603E7B2001.00000C407573.0153 9 0 distribute 47.00918100000000603E7B2001.00000C407573.0154 0 13 send 47.00918100000000603E7B2001.00000C407574.0155 19 0 forward 47.00918100000000603E7B2001.00000C407574.0156 11 10 data 47.00918100000000603E7B2001.00000C407572.0157 6 5 data 47.00918100000000603E7B2001.00000C407C02.02

Default Configuration for a Single Emulated LAN with Backup LECS and LES on the ATM Switch Router

The following examples show how to configure two Cisco 4500 routers and one ATM switch router for one emulated LAN with fault tolerance. Configurations for both Ethernet and Token Ring emulated LANs are shown.

Router 1 contains the LECS, LES, BUS, and an LEC. Router 2 contains only an LEC. The ATM switch router contains the backup LECS and the backup LES for this emulated LAN, along with another LEC (see Figure 13-4).

Figure 13-4 Single Emulated LAN with Backup LANE Example Network

This example shows how to accept all default settings provided. For example, it does not explicitly set ATM addresses for the different LANE components that are also on the router. Membership in this emulated LAN is not restricted.

Ethernet Example

Router 1
router1# show lane default-atm-addressesinterface ATM0:LANE Client: 47.00918100000000603E7B2001.00000C407572.**LANE Server: 47.00918100000000603E7B2001.00000C407573.**LANE Bus: 47.00918100000000603E7B2001.00000C407574.**LANE Config Server: 47.00918100000000603E7B2001.00000C407575.00note: ** is the subinterface number byte in hex
ATM Switch Router
Switch# show lane default-atm-addressinterface ATM2/0/0:LANE Client: 47.00918100000000603E7B2001.00603E7B2002.**LANE Server: 47.00918100000000603E7B2001.00603E7B2003.**LANE Bus: 47.00918100000000603E7B2001.00603E7B2004.**LANE Config Server: 47.00918100000000603E7B2001.00603E7B2005.00note: ** is the subinterface number byte in hex
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# atm lecs-address-default 47.00918100000000603E7B2001.00000C407575.00Switch(config)# atm lecs-address-default 47.00918100000000603E7B2001.00603E7B2005.00Switch(config)# endSwitch#
Router 1
router1# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router1(config)# lane database example1router1(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00000C407573.01router1(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00603E7B2003.01router1(lane-config-database)# default-name engrouter1(lane-config-database)# exitrouter1(config)# interface atm 3/0router1(config-if)# atm pvc 1 0 5 qsaalrouter1(config-if)# atm pvc 2 0 16 ilmirouter1(config-if)# lane config auto-config-atm-addressrouter1(config-if)# lane config database example1router1(config-if)#%LANE-5-UPDOWN: ATM0 database example1: LE Config Server (LECS) changed state to uprouter1(config-if)# interface atm 3/0.1router1(config-subif)# ip address 172.16.0.1 255.255.0.0router1(config-subif)# lane server-bus ethernet engrouter1(config-subif)# lane client ethernet engrouter1(config-subif)#%LANE-5-UPDOWN: ATM0.1 elan eng: LE Client changed state to uprouter1(config-subif)# endrouter1#
ATM Switch Router
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# lane database example1_backupSwitch(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00000C407573.01Switch(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00603E7B2003.01Switch(lane-config-database)# default-name engSwitch(lane-config-database)# exitSwitch(config)# interface atm 0Switch(config-if)# lane config auto-config-atm-addressSwitch(config-if)# lane config database example1_backupSwitch(config-if)#%LANE-5-UPDOWN: ATM2/0/0 database example1_backup: LE Config Server (LECS) changed state to up%LANE-6-LECS_INFO: ATM2/0/0: started listening on the well known LECS address%LANE-6-LECS_INFO: LECS on interface ATM2/0/0 became a BACKUP%LANE-6-LECS_INFO: ATM2/0/0: stopped listening on the well known LECS addressSwitch(config-if)# interface atm 0.1Switch(config-subif)# ip address 172.16.0.4 255.255.0.0Switch(config-subif)# lane server-bus ethernet engSwitch(config-subif)#%LANE-5-UPDOWN: ATM2/0/0.1 elan eng: LE Server/BUS changed state to upSwitch(config-subif)# lane client ethernet engSwitch(config-subif)#%LANE-5-UPDOWN: ATM2/0/0.1 elan eng: LE Client changed state to upSwitch(config-subif)# endSwitch#
Router 2
router2# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router2(config)# interface atm 3/0router2(config-if)# atm pvc 1 0 5 qsaalrouter2(config-if)# atm pvc 2 0 16 ilmirouter2(config-if)# interface atm 3/0.2router2(config-subif)# ip address 172.16.0.3 255.255.0.0router2(config-subif)# lane client ethernet engrouter2(config-subif)#%LANE-5-UPDOWN: ATM0.2 elan : LE Client changed state to uprouter2(config-subif)# endrouter2#
Token Ring Example (Catalyst 8510 MSR and LightStream 1010)

Router 1
router1# show lane default-atm-addressesinterface ATM3/0:LANE Client: 47.00918100000000603E7B2001.00000C407572.**LANE Server: 47.00918100000000603E7B2001.00000C407573.**LANE Bus: 47.00918100000000603E7B2001.00000C407574.**LANE Config Server: 47.00918100000000603E7B2001.00000C407575.00note: ** is the subinterface number byte in hex
ATM Switch
Switch# show lane default-atm-addressinterface ATM2/0/0:LANE Client: 47.00918100000000603E7B2001.00603E7B2002.**LANE Server: 47.00918100000000603E7B2001.00603E7B2003.**LANE Bus: 47.00918100000000603E7B2001.00603E7B2004.**LANE Config Server: 47.00918100000000603E7B2001.00603E7B2005.00note: ** is the subinterface number byte in hex
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# atm lecs-address-default 47.00918100000000603E7B2001.00000C407575.00Switch(config)# atm lecs-address-default 47.00918100000000603E7B2001.00603E7B2005.00Switch(config)# endSwitch#
Router 1
router1# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router1(config)# lane database example1router1(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00000C407573.01router1(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00603E7B2003.01router1(lane-config-database)# name eng local-seg-id 2048router1(lane-config-database)# default-name engrouter1(lane-config-database)# exitrouter1(config)# interface atm 3/0router1(config-if)# atm pvc 1 0 5 qsaalrouter1(config-if)# atm pvc 2 0 16 ilmirouter1(config-if)# lane config auto-config-atm-addressrouter1(config-if)# lane config database example1router1(config-if)#%LANE-5-UPDOWN: ATM0 database example1: LE Config Server (LECS) changed state to uprouter1(config-if)# interface atm 3/0.1router1(config-subif)# ip address 172.16.0.1 255.255.0.0router1(config-subif)# lane server-bus tokenring engrouter1(config-subif)# lane client tokenring engrouter1(config-subif)#%LANE-5-UPDOWN: ATM0.1 elan eng: LE Client changed state to uprouter1(config-subif)# endrouter1#
ATM Switch
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# lane database example1_backupSwitch(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00000C407573.01Switch(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00603E7B2003.01Switch(lane-config-database)# name eng local-seg-id 2048Switch(lane-config-database)# default-name engSwitch(lane-config-database)# exitSwitch(config)# interface atm 0Switch(config-if)# lane config auto-config-atm-addressSwitch(config-if)# lane config database example1_backupSwitch(config-if)#%LANE-5-UPDOWN: ATM2/0/0 database example1_backup: LE Config Server (LECS) changed state to up%LANE-6-LECS_INFO: ATM2/0/0: started listening on the well known LECS address%LANE-6-LECS_INFO: LECS on interface ATM2/0/0 became a BACKUP%LANE-6-LECS_INFO: ATM2/0/0: stopped listening on the well known LECS addressSwitch(config-if)# interface atm 0.1Switch(config-subif)# ip address 172.16.0.4 255.255.0.0Switch(config-subif)# lane server-bus tokenring engSwitch(config-subif)#%LANE-5-UPDOWN: ATM2/0/0.1 elan eng: LE Server/BUS changed state to upSwitch(config-subif)# lane client tokenring engSwitch(config-subif)#%LANE-5-UPDOWN: ATM2/0/0.1 elan eng: LE Client changed state to upSwitch(config-subif)# endSwitch#
Router 2
router2# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router2(config)# interface atm 3/0router2(config-if)# atm pvc 1 0 5 qsaalrouter2(config-if)# atm pvc 2 0 16 ilmirouter2(config-if)# interface atm 3/0.2router2(config-subif)# ip address 172.16.0.3 255.255.0.0router2(config-subif)# lane client tokenring engrouter2(config-subif)#%LANE-5-UPDOWN: ATM0.2 elan : LE Client changed state to uprouter2(config-subif)# endrouter2#
Displaying the LECS Configuration on the ATM Switch Router

The following example shows the show lane config command display for the LECS (Ethernet and Token Ring):
Switch# show lane configLE Config Server ATM2/0/0 config table: example1_backupAdmin: up State: operationalLECS Mastership State: backuplist of global LECS addresses (45 seconds to update):47.00918100000000603E7B2001.00000C407575.00 incoming call (vcd 88)47.00918100000000603E7B2001.00603E7B2005.00 <-------- meATM Address of this LECS: 47.00918100000000603E7B2001.00603E7B2005.00 (auto)vcd rxCnt txCnt callingParty88 0 0 47.00918100000000603E7B2001.00000C407575.00 LECScumulative total number of unrecognized packets received so far: 0cumulative total number of config requests received so far: 0cumulative total number of config failures so far: 0
Displaying the LES Configuration on the ATM Switch Router

The following example shows the show lane server command display for the Ethernet LES:
Switch# show lane serverLE Server ATM2/0/0.1 ELAN name: eng Admin: up State: operationaltype: ethernet Max Frame Size: 1516ATM address: 47.00918100000000603E7B2001.00603E7B2003.01LECS used: 47.00918100000000603E7B2001.00000C407575.00 connected, vcd 95
The following example shows the show lane server command display for the Token Ring LANE server:
Switch# show lane serverLE Server ATM2/0/0.1 ELAN name: eng Admin: up State: operationaltype: token ring Max Frame Size: 4544 Segment ID: 2048ATM address: 47.00918100000000603E7B2001.00603E7B2003.01LECS used: 47.00918100000000603E7B2001.00000C407575.00 connected, vcd 95
Default Configuration for a Token Ring ELAN with IP Source Routing (Catalyst 8510 MSR and LightStream 1010)

The following example shows how to configure a single emulated Token Ring LAN using a Cisco 4500 router and an ATM switch with IP source routing across a source-route bridged network. In this example, the emulated Token Ring LAN is source-route bridged to two physical Token Rings.

The router contains the LECS, LES, BUS, and an LEC. Both the ATM switch and Token Ring switch contain an LEC for the emulated LAN. This example uses all LANE default settings. For example, it does not explicitly set ATM addresses for the different LANE components that are colocated on the router. Membership in this emulated LAN is not restricted (see Figure 13-5).

Figure 13-5 Single Emulated Token Ring LAN with Token Ring Switch

Router
router# show lane default-atm-addressesinterface ATM0:LANE Client: 47.00918100000000603E7B2001.00000C407572.**LANE Server: 47.00918100000000603E7B2001.00000C407573.**LANE Bus: 47.00918100000000603E7B2001.00000C407574.**LANE Config Server: 47.00918100000000603E7B2001.00000C407575.00note: ** is the subinterface number byte in hex
ATM Switch
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# atm lecs-address-default 47.00918100000000603E7B2001.00000C407575.00Switch(config)# endSwitch#
Router
router# configure terminalEnter configuration commands, one per line. End with CNTL/Z.router(config)# lane database example1router(lane-config-database)# name eng server-atm-address 47.00918100000000603E7B2001.00000C407573.01router(lane-config-database)# name eng local-seg-id 2048router(lane-config-database)# default-name engrouter(lane-config-database)# exitrouter(config)# interface atm 3/0router(config-if)# atm pvc 1 0 5 qsaalrouter(config-if)# atm pvc 2 0 16 ilmirouter(config-if)# lane config auto-config-atm-addressrouter(config-if)# lane config database example1router(config-if)#%LANE-5-UPDOWN: ATM0 database example1: LE Config Server (LECS) changed state to uprouter(config-if)# interface atm 3/0.1router(config-subif)# ip address 172.16.0.1 255.255.0.0router(config-subif)# lane server-bus tokenring engrouter(config-subif)# lane client tokenring engrouter(config-subif)#%LANE-5-UPDOWN: ATM0.1 elan eng: LE Client changed state to uprouter(config-subif)# endrouter#
ATM Switch
Switch# configure terminalEnter configuration commands, one per line. End with CNTL/Z.Switch(config)# interface atm 0.1Switch(config-subif)# ip address 172.16.0.4 255.255.0.0Switch(config-subif)# lane client tokenring engSwitch(config-subif)# multiring ipSwitch(config-subif)#%LANE-5-UPDOWN: ATM2/0/0.1 elan : LE Client changed state to upSwitch(config-subif)# endSwitch#

Unspecified Digits In	Value Is
Prefix (first 13 bytes)	Obtained from ATM switch router via Integrated Local Management Interface (ILMI)
ESI (next 6 bytes)	Filled with the slot MAC address¹ plus •0—LANE Client (LEC) •1—LANE Server (LES) •2—LANE broadcast-and-unknown server (BUS) •3—LANE Configuration Server (LECS)
Selector field (last 1 byte)	Subinterface number, in the range 0 through 255

	Command	Purpose
Step 1	Switch(config)# atm lecs-address-default lecsaddress	Specifies the LECS ATM address for all of the ATM switch routers.
Step 2	Switch(config)# end Switch#	Exits configuration mode.
Step 3	Switch# copy system:running-config nvram:startup-config	Saves the configuration.

	Command	Purpose
Step 1	Switch(config)# lane database database-name Switch(lane-config-database)#	Creates a named database for the LECS.
Step 2	Switch(lane-config-database)# name elan-name server-atm-address atm-address [index n]	In the configuration database, binds the name of the emulated LAN to the ATM address of the LES.
Step 3	Switch(lane-config-database)# name elan-name local-seg-id seg-num	(Token Ring only.) In the configuration database, specifies the ring number for the emulated LAN. (Catalyst 8510 MSR and LightStream 1010)
Step 4	Switch(lane-config-database)# default-name elan-name	In the configuration database, assigns an emulated LAN to the LECS trying to join without specifying an ELAN name.

	Command	Purpose
Step 1	Switch(config)# interface atm 0[.subinterface#] Switch(config-if)#	If you are not currently configuring the interface, specifies the major ATM interface where the configuration server is located.
Step 2	Switch(config-if)# lane config database database-name	Links the configuration server's database name to the specified major interface, and enables the configuration server.
Step 3	Switch(config-if)# lane config auto-config-atm-address	Specifies that the configuration server's ATM address will be computed by our automatic method.

	Command	Purpose
Step 1	Switch(config)# interface atm 0.subinterface# Switch(config-subif)#	Specifies the subinterface for the first emulated LAN on this router.
Step 2	Switch(config-subif)# lane server-bus {ethernet \| tokenring} elan-name1	Enables a LES and a LANE BUS for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)
Step 3	Switch(config-subif)# lane client {ethernet \| tokenring} [elan-name1]	(Optional.) Enables a LANE client for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)
Step 4	Switch(config-subif)# ip address ip-address mask	Provides a protocol address for the client.

	Command	Purpose
Step 1	Switch(config)# interface atm 0.subinterface# Switch(config-subif)# or Switch(config)# interface atm card/subcard/port.subinterface# Switch(config-subif)#	Specifies the route processor subinterface number for an emulated LAN on this router. If you are using the optional ATM router module, specifies the ATM subinterface number. (Catalyst 8540 MSR)
Step 2	Switch(config-subif)# ip address ip-address	Provides a protocol address for the client on this subinterface.
Step 3	Switch(config-subif)# lane client {ethernet \| tokenring} elan-name1	Enables a LANE client for the first emulated LAN. (The tokenring option is not supported on the Catalyst 8540 MSR.)

	Command	Purpose
Step 1	Switch(config)# atm lecs-address lecsaddress	Specifies the address to the LECS.
Step 2	Switch(config)# interface atm 0[.subinterface#] Switch(config-if)# or Switch(config)# interface atm card/subcard/port[.subinterface#] Switch(config-if)#	Specifies the route processor interface. If you are using the optional ATM router module, specifies the ATM interface number. (Catalyst 8540 MSR)
Step 3	Switch(config-if)# lane client-atm-address atm-address-template	Specifies an ATM address, and overrides the automatic ATM address assignment for the LANE client.
Step 4	Switch(config-if)# lane client ethernet [elan-name]	Configures a LANE client on the specified subinterface.

Command	Purpose
show lane [interface atm card/subcard/port[.subinterface#] \| name elan-name] [brief]	Displays the global and per-virtual channel connection LANE information for all the LANE components and emulated LANs configured on an interface or any of its subinterfaces.
show lane bus [interface atm card/subcard/port[.subinterface#] \| name elan-name] [brief]	Displays the global and per-VCC LANE information for the BUS configured on any subinterface or emulated LAN.
show lane client [interface atm card/subcard/port[.subinterface#] \| name elan-name] [brief]	Displays the global and per-VCC LANE information for all LANE clients configured on any subinterface or emulated LAN.
show lane config [interface atm card/subcard/port[.subinterface#]]	Displays the global and per-VCC LANE information for the configuration server configured on any interface.
show lane database [name]	Displays the LECS's database.
show lane le-arp [interface atm card/subcard/port[.subinterface#] \| name elan-name]	Displays the LANE ARP table of the LANE client configured on the specified subinterface or emulated LAN.
show lane server [interface atm card/subcard/port[.subinterface#] \| name elan-name] [brief]	Displays the global and per-VCC LANE information for the LES configured on a specified subinterface or emulated LAN.