Configuring Virtual Connections

This chapter describes how to configure a typical ATM network after autoconfiguration has established the default network connections. The network configuration modifications described in this chapter are used to optimize your ATM network operation.

This chapter uses the following virtual path (VP) and virtual channel (VC) terminology:

Virtual Channel (VC)—A generic term used to describe transport of ATM cells associated with a common unique identifier value.
Virtual Channel Link—A means of transport of ATM cells between a point where a VCI value is assigned and the point where that value is translated or terminated.
Virtual Channel Identifier (VCI)—Identifies a particular VC link for a given VPC.
Virtual Channel Connection (VCC)—A concatenation of VC links that extends between two points where the adaptation layer is accessed. VCCs allow user-to-user, user-to-network, or network-to-network information transfer. Cell sequence integrity is preserved for the cells belonging to the same VCC.
Virtual Path (VP)—A generic term for a bundle of VC links: all the VC links in a bundle have the same end points.
Virtual Path Link—A group of VC links, identified by a common value VPI, between a point where the VPI value is assigned and the point where that value is translated or terminated.
Virtual Path Identifier (VPI)—Identifies a particular VP link.
Virtual Path Connection (VPC)—A concatenation of VP links that extends between two points where the VCI values are assigned and the point where those values are translated or removed. VPCs allow user-to-user, user-to-network, or network-to-network information transfer.

The characteristics of the VC are established when the VC is created and include the following:

Quality of service (QOS)
AAL mode (AAL5)
Peak and average transmission rates
Cell sequencing integrity

These switching features can be turned off with interface configuration commands; autonomous switching must be explicitly enabled per interface.

Note For a complete description of the commands mentioned in this chapter, refer to the LightStream 1010 ATM Switch Command Reference publication.

When configuring virtual connections perform the following tasks:

Table 6-1 list the types of supported virtual connections.

Table 6-1 Supported LightStream 1010 Virtual Connection Types

Connection Point-to-
Point Point-to-
Multipoint Transit Terminate

Permanent virtual channel link (PVCL)

3

3

—

—

Permanent virtual path link (PVPL)

3

3

—

—

Permanent virtual channel connection (PVCC)

3

3

3

3

Permanent virtual path connection (PVPC)

3

3

3

—

Soft permanent virtual channel connection (Soft PVCC)

3

—

3

—

Soft permanent virtual path connection (Soft PVPC)

3

—

3

—

Switched virtual channel connection (SVCC)

3

3

3

3

Switched virtual path connection (SVPC)

3

3

3

—

Connection	Point-to- Point	Point-to- Multipoint	Transit	Terminate
Permanent virtual channel link (PVCL)	3	3	—	—
Permanent virtual path link (PVPL)	3	3	—	—
Permanent virtual channel connection (PVCC)	3	3	3	3
Permanent virtual path connection (PVPC)	3	3	3	—
Soft permanent virtual channel connection (Soft PVCC)	3	—	3	—
Soft permanent virtual path connection (Soft PVPC)	3	—	3	—
Switched virtual channel connection (SVCC)	3	3	3	3
Switched virtual path connection (SVPC)	3	3	3	—

For an overview description of LightStream 1010 ATM switch configuration examples see the Light Stream 1010 ATM Switch User Guide publication. The LightStream 1010 ATM Switch Command Reference publication provides the complete syntax for every switch configuration command and describes the no form of each command.

Configure Permanent Virtual Channel Connections

This section describes configuring LightStream 1010 virtual channel connections (VCCs). A VCC is established as a bidirectional facility to transfer ATM traffic between two ATM layer users. Figure 6-1 shows a VCC between ATM user A and user D.

Figure 6-1 Virtual Channel Connection Example

Note The value of the virtual path and virtual channel identifiers may change as the traffic is relayed through the ATM network.

Virtual Channel Connection Command Description

To configure a point-to-point VCC, use the following configuration command using the no form of this command to remove an entry:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card/sub_card/port [.sub-inter #]
Configure the PVC.	atm pvc vpi [vci\|any-vci²] [upc upc] [pd pd] [rx-cttr index] [tx-cttr index] interface atm card/subcard/port[.vpt #] vpi [vci\|any-vci²] [upc upc]

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

2The any-vci parameter is only available for atm interface 2/0/0.

Note The row index for rx-cttr and tx-cttr must be configured before using this optional parameter. See the section "Configure Connection Traffic Table" in the chapter "Configuring Resource Management."

Parameter pd is not applicable to a virtual path.

Note When configuring PVC connections configure the lowest VPI and VCI numbers first.

Example

The following example configures the internal cross-connect PVC on Switch B between interface 3/0/1, VPI=0, VCI =50 and interface 3/0/2, VPI=2, VCI=100 (see Figure 6-1):

 
Switch-B(config)#interface atm 3/0/1

 
Switch-B(config-if)#atm pvc 0 50 interface atm 3/0/2 2 100

The following example configures the internal cross-connect PVC on Switch-C between interface 4/1/0, VPI=2, VCI =100 and interface 0/0/1, VPI 50, VCI=255:

 
Switch-C(config)#interface atm 4/1/0

 
Switch-C(config-if)#atm pvc 2 100 interface atm 0/0/1 50 255

Each subsequent VC cross-connection and link must be configured until the VC is terminated to create the entire VCC.

Example

The following example configures the CPU leg of any terminating PVC:

 
Switch(config)#interface atm 2/0/0

 
Switch(config-if)#atm pvc 0 ?

 
  <32-16383>  vci

 
  any-vci     Choose any available vci

 
Switch(config-if)#atm pvc 0 any-vci

 
Switch(config-if)#

When configuring the CPU leg of a PVC that is not a tunnel, the VPI should be configured as 0. The preferred method of VCI configuration is to select the any-vci parameter, unless a specific VCI is needed as a parameter in another command, such as map-list.

Note If configuring a specific VCI value for the CPU leg, select a VCI value higher than 300. This will prevent a conflict with an automatically assigned VCI for well-known channels if the switch reboots.

Use the show vc Command to Display Virtual Channel Connections

To show the VC configuration use the following EXEC mode commands:

Task	Command
Show the ATM interface configuration.	show atm interface [ atm interface atm card/sub_card/port ]
Show the PVC interface configuration.	show atm vc interface atm card/sub_card/port vpi vci

Examples

The following example displays Switch-B PVC configuration on interface 3/0/1:

 
Switch-B#show atm interface

 
Interface:      ATM-P0/0/3      Port-type:    CBR

 
IF Status:      UP              Admin Status: up

 
Auto-config:    enabled         AutoCfgState: waiting for response from peer

 
IF-Side:        Network         IF-type:      UNI

 
Uni-type:       Private         Uni-version:  V3.0

 
Max-VPI-bits:   8               Max-VCI-bits: 14

 
Max-VP:         255             Max-VC:       16383

 
Svc Upc Intent: pass            Signalling:   Enabled

 
ATM Address for Soft VC: 47.0091.8100.0000.0040.0b0a.2b81.4000.0c80.0030.00

 
Configured virtual links:

 
  PVCLs SoftVCLs   SVCLs   PVPLs SoftVPLs   SVPLs  Total-Cfgd  Installed-Conns

 
      0        0       0       0        0       0           0                0

 
Logical ports(VP-tunnels):     0

 
Input cells:    0               Output cells: 0

 
5 minute input rate:             0 bits/sec,       0 cells/sec

 
5 minute output rate:            0 bits/sec,       0 cells/sec

 
Input AAL5 pkts: 0, Output AAL5 pkts: 0, AAL5 crc errors: 0

 
<Information Deleted>

 
Switch#

The following example displays Switch-B PVC configuration on interface 3/0/1:

 
Switch-B#show atm vc interface atm 3/0/1

 
Interface    VPI     VCI     Type   X-Interface  X-VPI   X-VCI   Status

 
ATM3/0/1     0       50      PVC    ATM3/0/2     2       100     UP

 
Switch-B#

The following example displays Switch-B VC configuration on interface 3/0/1, VPI = 0, VCI = 50:

 
Switch-B#show atm vc interface atm 3/0/1 0 50

 
Interface: ATM3/0/1

 
VPI = 0  VCI = 50

 
Status: UP

 
Last-status-change-time: 15:44

 
Connection-type: PVC

 
Cast-type: point-to-point

 
Packet-discard-option: enabled

 
Usage-Parameter-Control (UPC): pass

 
Number of OAM-configured connections: 0

 
OAM-configuration: disabled

 
OAM-states:  Not-applicable

 
Cross-connect-interface: ATM3/0/2

 
Cross-connect-VPI = 2

 
Cross-connect-VCI = 100

 
Cross-connect-UPC: pass

 
Cross-connect OAM-configuration: disabled

 
Cross-connect OAM-state:  Not-applicable

 
Encapsulation: AAL5PNNI

 
Rx cells: 0, Tx cells: 0

 
Rx connection-traffic-table-index: 3

 
Rx service-category: VBR-RT (Realtime Variable Bit Rate)

 
Rx pcr-clp01: 424

 
Rx scr-clp01: 424

 
Rx tolerance: 50

 
Tx connection-traffic-table-index: 3

 
Tx service-category: VBR-RT (Realtime Variable Bit Rate)

 
Tx pcr-clp01: 424

 
Tx scr-clp01: 424

 
Tx tolerance: 50

 
Crc Errors:0, Sar Timeouts:0, OverSizedSDUs:0

 
Switch-B#

Configure Terminating PVC Connections

This section describes configuring terminating permanent virtual channel (PVC) connections. Terminating connections provide the connection to the LightStream 1010 switch CPU for LANE, IP over ATM, and control channels for ILMI, signaling, and PNNI plus network management.

Figure 6-2 is an illustration of transit and terminating connections.

Figure 6-2 Virtual Connection Types Example

Point-to-point and point-to-multipoint are two type of terminating connections. Both terminating connections are configured using the same commands as transit connections (discussed in the previous sections). However, all switch terminating connections use interface 2/0/0 to connect to the switch CPU.

The following sections describe both point-to-point and point-to-multipoint configuration of PVC and PVP connections.

Terminate PVC Connection Command Description

To configure both point-to-point and point-to-multipoint terminating PVC connections, use the following EXEC commands. Use the no form of this command to disable

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card-A/sub_card-A/port-A [.vpt #]
Configure the PVC between ATM switch connections.	atm pvc vpi-A [vci-A \|any-vci²] [cast-type p2mp-leaf p2mp-root p2p] [upc upc-A] [pd pd] [rx-cttr index] [tx-cttr index] interface atm card-B/subcard-B/port-B[.vpt #] vpi-B [vci-A\|any-vci²] [upc upc-B] [cast-type p2mp-leaf p2mp-root p2p]

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

2The any-vci feature is only available for interface ATM 2/0/0.

When configuring point-to-multipoint PVC connections using the atm pvc command, the root point is port A and the leaf points are port B.

Examples

The following example configures the CPU leg of any terminating PVC:

 
Switch(config)#interface atm 2/0/0

 
Switch(config-if)#atm pvc 0 ?

 
  <32-16383>  vci

 
  any-vci     Choose any available vci

 
Switch(config-if)#atm pvc 0 any-vci

 
Switch(config-if)#

The following example configures the internal cross-connect PVC between interface 3/0/1, VPI=1, VCI =50 and the terminating connection at the CPU interface 2/0/0, VPI=0, and VCI unspecified:

 
Switch-B(config)#interface atm 3/0/1

 
Switch-B(config-if)#atm pvc 1 50 interface atm 2/0/0 0 any-vci encap aal5snap

The following example configures a point-to-multipoint connection from the root point PVC on switch interface 0/0/0, VPI=50, VCI =100 and the terminating connection at the leaf point switch CPU interface 2/0/0, VPI=0, VCI=300:

 
Switch(config)#interface atm 0/0/0

 
Switch(config-if)#atm pvc 50 100 interface atm 2/0/0 0 300 enacap aal5snap

Displaying the Terminating PVC Connections

To show the terminating PVC configuration, use the following EXEC mode commands:

Task	Command
Show the ATM interface configuration.	show atm vc card/sub_card/port
Show the PVC interface configuration.	show atm vc interface atm card/sub_card/port vpi vci

See the section "Use the show vc Command to Display Virtual Channel Connections" for examples of the show atm vc commands.

Configure Permanent Virtual Path Connections

This section describes configuring a permanent virtual path (PVP) connection. Figure 6-3 is an example of an LightStream 1010 switch with PVPs configured through the switch.

Figure 6-3 Virtual Path Connection Example

To configure a permanent virtual path connection, use the following EXEC commands. Use the no form of this command to disable:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the physical interface to be configured.	interface atm card/sub_card/port
Configure interface PVP.	atm pvp vpi [cast-type type] [upc upc] [rx-cttr index] [tx-cttr index] interface card/sub_card/port

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

Note When configuring PVP connections configure the lowest VPI numbers first.

Example

The following example configures the internal cross-connect PVP within Switch-B between interfaces 3/0/1, VPI=0 and interface 3/0/2, VPI=2:

 
Switch-B(config)#interface atm 3/0/1

 
Switch-B(config-if)#atm pvp 1 interface atm 3/0/2 2

 
Switch-B(config-if)# 

The following example configures the internal cross-connect PVP within Switch-C between interfaces 4/1/0, VPI=2 and interface 0/0/1, VPI=50:

 
Switch-C(config)#interface atm 4/1/0

 
Switch-C(config-if)#atm pvp 2 interface atm 0/0/1 50

 
Switch-C(config-if)# 

Each subsequent PVP cross-connection and link must be configured until the VP is terminated to create the entire PVP.

Use show atm vp Command to Display Virtual Path Connection

To show the ATM interface configuration, use the following command:

Task	Command
Show the ATM VP configuration.	show atm vp

Example

The following example displays the PVP configuration of Switch-B:

 
Switch-B#show atm vp

 
Interface    VPI    Type  X-Interface     X-VPI     Status

 
ATM3/0/1     0      PVP   ATM3/0/2        2         UP

 
Switch-B#

Configure Point-To-Multipoint PVC Connection

This section describes configuring point-to-multipoint PVC connections.

In Figure 6-4, cells entering the switch at the root point (on the left side at interface 0/0/0, VPI=50, VCI=100), are duplicated and switched to the leaf points (output interfaces), on the right side of the example.

Figure 6-4 Point-to-Multipoint PVC Example

Note If desired, one of the leaf points can terminate in the LightStream 1010 at the CPU interface ATM 2/0/0.

Point-To-Multipoint PVC Connection Command Description

This section describes the commands needed to configure the example in Figure 6-4.

To configure point-to-multipoint PVC connections use the following EXEC commands. Use the no form of this command to disable:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card/sub_card/port [.vpt #]
Configure the PVC between ATM switch connections.	atm pvc vpi-A vci-A [cast-type p2mp-leaf p2mp-root p2p] [upc upc-A] [pd pd] [rx-cttr index] [tx-cttr index] interface atm card-B/subcard-B/port-B[.vpt #] vpi-B vci-B [cast-type type] [upc upc-B]

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

To configure the point-to-multipoint PVC connections using the atm pvc command the root point is port-A and the leaf points are port-B.

Example

The following example configures the root point PVC on switch interface 0/0/0, VPI=50, VCI =100 to the leaf point interface 0/1/0, VPI=60, VCI=200 (see Figure 6-4):

 
Switch(config)#interface atm 0/0/0

 
Switch(config-if)#atm pvc 50 100 cast-type p2mp-root interface atm 0/1/0 60 200 cast-type p2mp-leaf

The following example configures the same root point PVC to the leaf point interface 0/1/1, VPI=70, VCI=210:

 
Switch(config-if)#atm pvc 50 100 cast-type p2mp-root interface atm 0/1/1 70 210 cast-type p2mp-leaf

The following example configures the same root point PVC to the leaf point interface 0/1/2, VPI=80, VCI=220:

 
Switch(config-if)#atm pvc 50 100 cast-type p2mp-root interface atm 0/1/2 80 220 cast-type p2mp-leaf

show atm vc Example to Display Point-To-Multipoint PVC Configuration

To show the point-to-multipoint PVC configuration use the following EXEC mode commands:

Task	Command
Show the ATM interface configuration.	show atm vc card/sub_card/port
Show the PVC interface configuration.	show atm vc interface atm card/sub_card/port vpi vci

Examples

The following example displays the point-to-multipoint PVC configuration on interface 3/0/1:

 
Switch#show atm vc interface atm 0/0/0

 
Interface    VPI     VCI     Type   X-Interface  X-VPI   X-VCI   Status

 
ATM0/0/0     50      100     PVC    ATM1/1/0     60      200     UP

 
ATM0/0/0     50      100     PVC    ATM1/1/1     70      210     UP

 
ATM0/0/0     50      100     PVC    ATM1/1/2     80      220     UP

 
Switch#

The following example displays the VC configuration on interface 3/0/1, VPI = 50, VCI = 100:

 
Switch#show atm vc interface atm 0/0/0 50 100

 
Interface: ATM3/0/1

 
VPI = 50  VCI = 100

 
Status: UP

 
Last-status-change-time: 15:44

 
Connection-type: PVC

 
Cast-type: point-to-multipoint

 
Packet-discard-option: enabled

 
Usage-Parameter-Control (UPC): pass

 
Number of OAM-configured connections: 0

 
OAM-configuration: disabled

 
OAM-states:  Not-applicable

 
Cross-connect-interface: ATM0/1/0

 
Cross-connect-VPI = 60

 
Cross-connect-VCI = 200

 
Cross-connect-UPC: pass

 
Cross-connect-interface: ATM0/1/1

 
Cross-connect-VPI = 70

 
Cross-connect-VCI = 210

 
Cross-connect-UPC: pass

 
Cross-connect-interface: ATM0/1/2

 
Cross-connect-VPI = 80

 
Cross-connect-VCI = 220

 
Cross-connect-UPC: pass

 
Encapsulation: AAL5PNNI

 
Rx cells: 0, Tx cells: 0

 
Rx connection-traffic-table-index: 3

 
Rx service-category: VBR-RT (Realtime Variable Bit Rate)

 
Rx pcr-clp01: 424

 
Rx scr-clp01: 424

 
Rx tolerance: 50

 
Tx connection-traffic-table-index: 3

 
Tx service-category: VBR-RT (Realtime Variable Bit Rate)

 
Tx pcr-clp01: 424

 
Tx scr-clp01: 424

 
Tx tolerance: 50

 
Switch#

Configure Point-To-Multipoint PVP Channel

This section describes configuring point-to-multipoint PVP connections.

Figure 6-5 provides an example of point-to-multipoint PVP connections.

Figure 6-5 Point-to-Multipoint Permanent Virtual Path Example

In Figure 6-5, cells entering the switch at the root point (the left side at interface 0/0/0), VPI=50, are duplicated and switched to the leaf points (output interfaces), on the right side of the example.

The following section describes the commands needed to configure this example.

Point-To-Multipoint PVP Command Description

To configure point-to-multipoint PVP connections, use the following EXEC commands. Use the no form of this command to disable:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card-A/sub_card-A/port-A
Configure interface PVP.	atm pvp vpi-A [cast-type p2mp-leaf p2mp-root p2p] [upc upc-A] [rx-cttr index] [tx-cttr index] interface card-B/sub_card-B/port-B vpi-B [cast-type type]

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

To configure the point-to-multipoint PVP connections using the atm pvp command the root point is Port A and the leaf points are Port B.

Examples

The following example configures the root point PVP on switch interface 0/0/0, VPI=50 to the leaf point interface 0/1/0, VPI=60 (see Figure 6-5):

 
Switch(config)#interface atm 0/0/0

 
Switch(config-if)#atm pvc 50 cast-type p2mp-root interface atm 0/1/0 60 cast-type p2mp-leaf

The following example configures the same root point PVP to the leaf point interface 0/1/0, VPI=70:

 
Switch(config-if)#atm pvc 50 cast-type p2mp-root 0/1/0 70 cast-type p2mp-leaf

The following example configures the same root point PVP to the leaf point interface 0/1/2, VPI=80:

 
Switch(config-if)#atm pvc cast-type p2mp-root 50 0/1/2 80 p2mp-leaf

Use show atm vp Command to Display Point-To-Multipoint PVP Configuration

To show the ATM interface configuration use the following command:

Task	Command
Show the ATM VP configuration.	show atm vp

Example

The following example displays the PVP configuration of the point-to-multipoint PVP connections:

 
Switch#show atm vp

 
Interface    VPI    Type  X-Interface     X-VPI     Status

 
ATM0/0/0     50      PVP   ATM0/1/0       60         UP

 
                           ATM0/1/1       70         UP

 
                           ATM0/1/2       80         UP

 
Switch#

Configure Soft Permanent Virtual Channel (Soft PVC) Connections

This section describes configuring soft PVC connections. Soft PVC connections provide the following features:

Connection to another host or switch that does not support signaling
Configuration of PVCs without the manual configuration steps described in the section "Configure Permanent Virtual Channel Connections"
Configuration of PVCs with the reroute or retry capabilities when a failure occurs within the network

Figure 6-6 is an illustration of the soft PVC connections used in the following examples:

Figure 6-6 Soft Permanent Virtual Channel Connection Example

Soft Permanent Virtual Channel Command Description

To configure a soft PVC connection, use the following EXEC commands. Use the no form of this command to disable:

Task	Command
Determine dstination ATM address.	show atm addresses
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card/sub_card/port [.vpt #]
Configure soft PVC connection.	atm soft-vc src-vpi src-vci dest-address dest-vpi dest-vci [pd pd] [rx-cttr index] [slow-retry-interval seconds] [tx-cttr index] [upc drop pass tag]

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

Example

The following example allows User A to determine the destination ATM address of the interface connected to User D:

 
Switch-C#show atm addresses

 
Switch Address(es):

 
  47.00918100000000603E5ADB01.00603E5ADB01.00 active

 
Soft VC Address(es):

 
  47.0091.8100.1111.1111.1111.1111.1111.1111.1111.00 ATM4/0/0

 
ILMI Switch Prefix(es):

 
  47.0091.8100.0000.0060.3e5a.db01

 
ILMI Configured Interface Prefix(es):

 
LECS Address(es):

 
Switch-C#

The following example configures a soft PVC on Switch-B between interface 0/0/0, source VPI = 0, source, VCI = 200, and Switch-C, destination ATM address = 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00, VPI = 0, VCI = 100 (see Figure 6-6):

 
Switch-B(config)#interface atm 0/0/0

 
Switch-B(config-if)#atm soft-vc 0 200 dest-address 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00 
00 100 

show vc Example

To display the soft VC configuration at either end switch use the following EXEC mode commands:

Task	Command
Show the ATM interface configuration.	show atm vc card/sub_card/port
Show the soft VC interface configuration.	show atm vc interface atm card/sub_card/port vpi vci

Examples

The following example displays the soft VC configuration of Switch-B, on interface 0/0/0 out to the ATM network:

 
Switch-B#show atm vc interface atm 0/0/0

 
Interface    VPI     VCI     Type   X-Interface  X-VPI   X-VCI   Status

 
ATM0/0/0     0       200     softvc ATM2/0/0     50      135     UP

 
Switch-B#

The following example displays the soft VC configuration of Switch-C, on interface 4/0/0 out to the ATM network:

 
Switch-C#show atm vc interface atm 4/0/0

 
Interface    VPI     VCI     Type   X-Interface  X-VPI   X-VCI   Status

 
ATM4/0/0     0       100     softvc ATM0/1/0     75      250     UP

 
Switch-C#

Configure Soft Permanent Virtual Path (Soft PVP) Connections

This section describes configuring soft permanent virtual path (soft PVP) connections. Soft PVP connections provide the following features:

Connection to another host or switch that does not support signaling
Configuration of PVPs without the manual configuration steps described in the section "Configure Permanent Virtual Channel Connections"
Configuration of PVPs with the reroute or retry capabilities when a failure occurs within the network

Figure 6-7 is an illustration of the soft PVP connections used in the section.

Figure 6-7 Soft Permanent Virtual Path Connection Example

Soft Permanent Virtual Path Command Description

To configure a soft PVP connection, use the following EXEC commands. Use the no form of this command to disable:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card/sub_card/port
Configure soft PVP connection.	atm soft-vp src-vpi dest-address dest-vpi [pd pd] [rx-cttr index] [slow-retry-interval seconds] [tx-cttr index] [upc drop pass tag]

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

Example

The following example configures a soft PVP on Switch-B between interface 0/0/0, source VPI=75, and Switch-C, destination ATM address=47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00, VPI=50 (Figure 6-7):

 
Switch-B(config)#interface atm 0/0/0

 
Switch-B(config-if)#atm soft-vp 75 47.0091.8100.00.0000.1111.1111.1111.1111.1111.1111.00 50 

Use show atm vp Command to Display Virtual Path Connection

To show the ATM virtual path configuration use the following command:

Task	Command
Show the ATM VP configuration.	show atm vp

Example

The following example displays the soft VP configuration at switch B, on interface 0/0/0 out to the ATM network:

 
Switch-B#show atm vp

 
Interface    VPI    Type  X-Interface     X-VPI     Status

 
ATM0/0/0     75     SoftvpATM1/1/0        45        UP

 
Switch-B#

The following example displays the soft VP configuration at switch C, on interface 4/0/0 out to the ATM network:

 
Switch-C#show atm vp

 
Interface    VPI    Type  X-Interface     X-VPI     Status

 
ATM4/0/0     50     SoftvpATM3/1/3        60        UP

 
Switch-C#

Configure Soft PVC Route Optimization Feature

This section describes the soft PVC route optimization feature. Most soft PVCs have a much longer lifetime than SVCs. The route chosen during PVC setup remains the same even though the network topology may change.

Soft PVC connections, with the route optimization percentage threshold set, provide the following features:

When a better route is available, soft PVCs are dynamically rerouted.
Route optimization can be triggered manually

Note Soft PVC route optimization should not be configured with CBR connections.

Route optimization is directly related to administrative weight. Administrations weight is similar to hop count. For a description of administrative weight see the section "Configure Administrative Weight Mode" in the chapter "Configuring ATM Routing and PNNI."

Configuring soft PVC route optimization is described in the following sections:

Enable Soft PVC Route Optimization

Soft PVC route optimization must be enabled, and a threshold level configured, to determine the point when a better route is identified and the old route is reconfigured.

To enable and configure soft PVC route optimization, use the following EXEC commands. Use the no form of this command to disable:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Configure soft PVP route optimization.	atm route-optimization {percentage-threshold 5-500}

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

Example

The following example enables soft PVC route optimization and sets the threshold percentage to 250 percent:

 
Switch(config)#atm  route-optimization percentage-threshold 250

 
Switch(config)#

Configuring a Soft PVC Interface with Route Optimization

Soft PVC route optimization must be enabled and configured to determine the point when a better route is found the old route is reconfigured.

To enable and configure asoft PVC interface with route optimization, use the following interface configuration commands. Use the no form of this command to disable:

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card/sub_card/port
Configure the interface soft PVP route optimization.	atm route-optimization soft-connection {interval minute\|time-of-day {anytime \|start time_hh:mm\|end time_hh:mm}

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

Example

The following example configures a soft PVC with route optimization interval configured as every 30 minutes between the hours of 6:00 PM and 5:00 AM:

 
Switch(config)#interface atm 0/0/0

 
Switch(config-if)#

 
Switch(config-if)#atm route-optimization soft-connection interval 30

 
Switch(config-if)#$ptimization soft-connection interval 30 time-of-day 18:00 5:00

 
Switch(config-if)#

show Interface Route Optimization Configuration Example

To display the soft PVC route optimization configuration, use the following EXEC mode commands:

Task	Command
Show the soft VC interface configuration.	show atm interface atm card/sub_card/port

Examples

The following example displays the soft PVC configuration on interface 0/0/0:

 
Switch#show atm interface atm 0/0/0

 
Interface:      ATM0/0/0        Port-type:    oc3suni

 
IF Status:      UP              Admin Status: up

 
Auto-config:    enabled         AutoCfgState: completed

 
IF-Side:        Network         IF-type:      NNI

 
Uni-type:       not applicable  Uni-version:  not applicable

 
Max-VPI-bits:   8               Max-VCI-bits: 14

 
Max-VP:         255             Max-VC:       16383

 
Svc Upc Intent: pass            Signalling:   Enabled

 
Soft vc route optimization is enabled

 
Soft vc route optimization interval = 30 minutes

 
Soft vc route optimization time-of-day range = (18:0 - 5:0)

 
ATM Address for Soft VC: 47.0091.8100.0000.0041.0b0a.1081.4000.0c80.0000.00

 
Configured virtual links:

 
  PVCLs SoftVCLs   SVCLs   PVPLs SoftVPLs   SVPLs  Total-Cfgd  Installed-Conns

 
      3        0       0       0        0       0           3                3

 
Logical ports(VP-tunnels):     0

 
Input cells:    335654          Output cells: 335588

 
5 minute input rate:             0 bits/sec,       0 cells/sec

 
5 minute output rate:            0 bits/sec,       0 cells/sec

 
Input AAL5 pkts: 219142, Output AAL5 pkts: 219123, AAL5 crc errors: 0

 
Switch#

Configuring Non-Default Well-known PVCs

Normally the default well-known VCs will be automatically created with default VCIs. But for the unusual instances where the LightStream 1010 switch will interface to non-standard equipment, the steps described in this scetion will allow configuring nondefault well-known VCI values on a per-interface basis.

Table 6-2 list the default well-known VCs and their default configuration.

Table 6-2 Well-Known Virtual Channels

Channel Type Virtual Path Identifier Virtual Channel Identifier

Signaling

0

5

ILMI

0

16

PNNI

0

18

Channel Type	Virtual Path Identifier	Virtual Channel Identifier
Signaling	0	5
ILMI	0	16
PNNI	0	18

Caution Do not change the well-known channels to use a VC where the remote end is sending AAL-5 messages not intended for this well-known VC. For example, do not swap VC values between two types of Well-Known VCs.

Following is an overview of the steps needed to configure nondefault well-known VCs:

Step 1 Enable manual well-known VC configuration

Step 2 Delete the existing automatically created well-known VCs.

Step 3 Configure the individual encapsulation type as follows:

Signaling (QSAAL)
ILMI
PNNI

Step 4 Copy running-config to startup-config

To configure the nondefault VCs for signaling, ILMI, and PNNI, use the following EXEC commands. Use the no form of this command to disable

Task	Command
At the privileged EXEC prompt, enter configuration mode from the terminal.	configure¹ [terminal]
Select the interface to be configured.	interface atm card/sub_card/port
Delete existed well-known VCs from the selected interface and enter manual-well-known-vc mode.	atm manual-well-known-vc {keep\|delete}
Configure the nondefault PVC for each of the signaling, ILMI, and, if needed, the PNNI channels.	atm pvc vpi vci [upc upc] [pd pd] [rx-cttr index] [tx-cttr index] interface atm 2/0/0 any-vci [encap {ilmi\|pnni\|qsaal}]
Disable the PVC.	no atm pvc vpi vci
Shutdown the interface.	shutdown
Disable signaling on the interface.	no atm signalling-enable
Enable signaling on the interface.	atm signalling-enable
Return to EXEC configuration mode.	^Z
Copy the running configuration file to the startup configuration file.	copy running-config startup-config

1This command is documented in the LightStream 1010 ATM Switch Command Reference publication.

Examples

The following example performs the nondefault VC configuration steps:

Step 1 Uses show atm vc interface atm 0/0/0 to display the configuration of the exiting default well-known VCs for ATM interface 0/0/0.

Step 2 Change to interface configuration mode for ATM interface 0/0/0.

Step 3 Enter manual-well-known-vc mode and delete the existing default well-known VCs using the atm manual-well-known-vc delete command.

Step 4 Confirm deletion by entering y.

Step 5 Configure the nondefault VC for signaling from the default 5 to 35 using the atm pvc 0 35 interface atm 2/0/0 0 any-vci encap qsaal command.

Step 6 Cofigure the ILMI VC then, configure the PNNI VC if needed using the same procedure.

Step 7 Save the new running configuration to the startup configuration using the copy running-config startup-config command.

Following is an example of this procedure:

 
Switch#show atm vc interface atm 0/0/0

 
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status

 
ATM0/0/0     0     5      PVC     ATM2/0/0     0     49    QSAAL  UP

 
ATM0/0/0     0     16     PVC     ATM2/0/0     0     33    ILMI   UP

 
ATM0/0/0     0     18     PVC     ATM2/0/0     0     65    PNNI   UP

 
Switch#

 
Switch#config t

 
Enter configuration commands, one per line.  End with CNTL/Z.

 
Switch(config)#interface atm 0/0/0

 
Switch(config-if)#atm manual-well-known-vc delete

 
Okay to delete well-known VCs for this interface? [no]: y

 
Switch(config-if)#ex

 
Switch(config)#interface atm 0/0/0

 
Switch(config-if)#atm pvc 0 35 interface atm 2/0/0 0 any-vci encap qsaal

 
Switch(config-if)#^Z

 
Switch#

 
%SYS-5-CONFIG_I: Configured from console by console

 
Switch#show atm vc interface atm 0/0/0

 
Interface    VPI   VCI   Type    X-Interface  X-VPI X-VCI  Encap Status

 
ATM0/0/0     0     35     PVC     ATM2/0/0     0     150   QSAAL  UP

 
Switch#copy running-config startup-config

 
Building configuration...

 
[OK]

 
Switch#

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