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This chapter describes the Interim Local Management Interface (ILMI) protocol implementation within the Lightstream 1010 ATM switch.The Lightstream 1010 uses ILMI to automatically identify which of its interfaces are User-Network Interface (UNI), attached to ATM end-systems, and which are Network-to-Network Interface (NNI), attached to other systems. It can also differentiate between private and public network links. This information is used by the ATM routing protocols, Private Network-to-Network Interface (PNNI) and Interim Interswitch Protocol (IISP), to automatically discover and bring up a network of interconnected LightStream 1010 switches.
The ILMI protocol is also used for ATM address registration across an ATM UNI, and for the following:
ILMI reduces the need for manual configuration of attached end-systems, and is important in the plug-and-play operation of Lightstream 1010 based networks. ILMI is also used to inform LANE clients of the location of the LANE Configuration Server (LECS). ILMI on the LightStream 1010 also allows the switch to provide Cisco ATM adapters with the address of an Internet protocol (IP) over ATM (RFC 1577) Address Resolution Protocol (ARP) server. This allows plug-and-play operation of ATM desktops.
Two tasks will be described in the following sections:
This section describes configuring the ATM address and the LAN emulation configuration server (LECS) address, and displaying the ILMI configuration for the entire switch.
The LightStream 1010 ATM Switch is autoconfigured with an ATM address using a hierarchical addressing model similar to the Open System Interconnect (OSI) network service access point (NSAP) addresses. PNNI uses this hierarchy to construct ATM peer groups. ILMI uses the first 13 bytes of this address as the switch prefix that it registers with end systems.
During the initial startup, the LightStream 1010 generates an ATM address using the defaults described in the section "ATM Address Configuration" in the chapter "Initially Configuring the LightStream 1010 ATM Switch."
Note The most important rule in the addressing scheme is to maintain the uniqueness of the address across very large networks.
For configuration of a new ATM address that replaces the previous ATM address and is used to generate a new PNNI node ID and peer group ID, see the section "Configure PNNI Node" in the chapter "Configuring ATM Routing and PNNI."
Multiple addresses can be configured for a single switch and this configuration can be used during ATM address migration. ILMI registers end systems with multiple prefixes during this period until an old address is removed. PNNI automatically summarizes all of the switch's prefixes in its reachable address advertisement.
To configure a new ATM address that replaces the previous ATM address when running IISP only, perform the following task in global configuration mode:
| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
The following example adds the ATM address prefix 47.0091.8100.5670.000.0ca7.ce01 and the ellipses (...) add the default MAC address as the last six bytes.
The Lightstream 1010 ATM switch allows configuration of per interface ILMI address prefixes. This allows for different address prefixes to be registered with end systems attached to different interfaces. When any per interface ILMI address prefixes are configured, they override the prefix(es) derived from the first 13-bytes of the switch ATM address(es), for that specific interface.
Multiple ILMI address prefixes can be configured on each interface, for example, during ATM address migration.
To configure a per interface ILMI address prefix, use the following command using the no form of this command to remove the prefix:
| Task | Command |
|---|---|
At the privileged EXEC prompt, enter configuration mode from the terminal. |
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Specify an ATM interface and enter interface configuration mode. |
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| 1These commands are documented in the LightStream 1010 ATM Switch Command Reference publication. |
The following example changes the ATM address of the switch from the auto-configured address 47.0091.8100.0000.0041.0b0a.1081.0041.0b0a.1081.00 to the new address prefix 47.0091.8100.5670.0000.0000.1122.0041.0b0a.1081.00:
The following example configure an additional ATM address manually, address prefix 47.0091.8100.0000.0003.c386.b301 on ATM interface 0/0/1:
Use the show atm address command to display the ILMI address prefix configuration for all interfaces or a specific interface.
To display the ILMI address prefix configuration, perform the following task in user EXEC mode:
The following example displays the ILMI address prefix configuration for all ATM interfaces:
Use the following command to configure the LAN Emulation Configuration Server (LECS) address advertised to the directly connected end nodes. Use the no form of this command to return to the default configuration.
| Task | Command |
|---|---|
At the privileged EXEC prompt, enter configuration mode from the terminal. |
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| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
The sequence_number provides the position of this address in the ordered LECS address table.
The following example configures the LECS ATM address:
Proceed to the following section to confirm the switch ILMI configuration.
To display the switch ILMI configuration, use the following EXEC mode commands:
| Task | Command |
|---|---|
The following example displays the LightStream 1010 ATM address and the LECS address:
The following example displays the ILMI configuration:
The following example displays the ILMI status:
This section describes configuration of an ILMI interface on a per interface basis. Use the no form of the following commands to disable ILMI parameters:
| Task | Command |
|---|---|
At the privileged EXEC prompt, enter configuration mode from the terminal. |
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Configure ILMI address registration for a specified interface. |
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| 1This command is documented in the LightStream 1010 ATM Switch Command Reference publication. |
The following example enables ILMI on ATM interface 3/0/3:
The following example enables ATM address registration on ATM interface 3/0/3:
Note If you use the no atm address-registration command to disable ILMI on this interface the keep-alives and responses to incoming ILMI queries will continue to function. If you want ILMI to be completely disabled at this interface, the ILMI permanent virtual channel (PVC) should be disabled.
The following example configures the ILMI ATM interface 3/0/3 with a keepalive time of 20 seconds:
In this example, the peer network element is polled every 20 seconds.
Proceed to the following section to confirm the ILMI interface configuration.
To show the ILMI configuration use the following EXEC mode command:
| Task | Command |
|---|---|
The following example displays the ILMI status for ATM interface 3/0/0:
Posted: Thu Jan 23 21:04:31 PST 2003
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