Document ID: 27923
Updated: Dec 18, 2007
Contents
Introduction
This document provides sample configurations for virtual path (VP) tunnels and VP switching.
With VP switching, the switching decision is solely based on the virtual path identifier (VPI) number. This is unlike VPI and virtual channel identifier (VCI) for virtual channel (VC) switching, which reduces administration as well as allows for faster switching of cells.
With VP tunnels, the VP interface is a multiplexing/demultiplexing point on an ATM switch at which VCs from various ATM interfaces are aggregated to a VP on an interface. VPs are ATM connections that are an aggregate of multiple VCs that all have the same VPI number. VPs are most often used across WANs.
ATM Connections
The two major types of ATM connections are VCs and VPs.
VCs are uniquely identified on the port of an ATM switch by the VPI and VCI numbers.
VPs are uniquely identified on the ATM port by the VPI number on the ATM port.
In the diagram above, ATM cells that arrive on the VC are switched based on both the VPI and VCI number in the cell header. On the other hand, ATM cells that arrive on the VP are switched based on the VPI number only. Configuration of the ATM switch determines if the switch is supposed to be a VC or VP switch for a specific VPI/VCI pair or VPI respectively.
In this diagram, a cell is switched at the VC or VP level. With VC switching, the switch receives a cell with a configured VPI and VCI. It then looks up its connection table to determine the outgoing port (or ports) with a new VPI/VCI value. VCI/VPI 100/2 and 110/2 are attached to port 1 and the VCI/VPI associated with port 2 is 110/5. Notice that the VCI has only local significance and does not need to be unique. For port 3, the VPI/VCI associated with it is 1/50. VPI/VCI 7/100 and 7/110 are associated to port 4.
You can switch traffic from an upcoming port on the switch to an outgoing port. For example, you can determine that all traffic coming on port 1 VPI/VCI 2/100 is switched to port 4 VPI/VCI 7/110. In the same manner, you can configure the ATM switch to transfer traffic from port 2 VPI/VCI 5/110 to port 4 VCI/VPI 7/100. This table shows how the packets can be switched from one VPI/VCI to another. This is VC switching since it uses the VPI and VCI information to switch the traffic.
Another way to switch ATM traffic is to use only the VPI information. In this table you can see that port 1 VPI 2 is switched to port 4 VPI 7 and port 2 VPI 5 is switched to port 3 VPI 1.
Both VP and VC switching can be seen in this diagram:
There are three different types of VP tunnels on Cisco Enterprise ATM Switches:
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Regular or unshaped VP tunnels
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Shaped VP tunnels
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Hierarchical VP tunnels
Regular or unshaped VP tunnels are VP tunnels on which there is no traffic shaping for any ATM service category. VP tunnels can be of any service category but cannot be shaped. VCs in a tunnel have to be of the same service category as the VP tunnel.
Shaped VP tunnels are VP tunnels that are traffic shaped. They are defined only for the Constant Bit Rate (CBR) service category on Cisco Enterprise ATM switches. All VCs within a single VP tunnel must be the same service category. The overall output of this VP tunnel is rate-limited by hardware to the PCR of the tunnel.
Hierarchical VP tunnels are VP tunnels that are traffic shaped and support VCs of multiple service categories to co-exist in the tunnel at the same time. They are used, for example, if you have more than one service category but only one VP tunnel.
Prerequisites
Requirements
There are no specific requirements for this document.
Components Used
The information in this document is based on these software and hardware versions.
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An unshaped VP tunnel of any service category is supported on LS1010 (with either feature card per-class queuing (FC-PCQ) and feature card per-flow queuing (FC-PFQ)), a Catalyst 8540-MSR, a Catalyst 8510-MSR, a Cisco 7500 series router with PA-A3, and a Cisco 7200 series router with PA-A2 or PA-A3, Cisco 7500 series router with PA-A6, and a Cisco 7200 series router with PA-A6. Cisco IOS® Software Releases 11.2, 11.3 or 12.0 support this feature. VCs within an unshaped tunnel have to be of the same service category of an unshaped VP tunnel.
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A shaped VP tunnel of a CBR service category is supported on LS1010 with FC-PFQ, Catalyst 8510-MSR, Catalyst 8540-MSR, Cisco 7500 series routers with PA-A3, and Cisco 7200 series routers with PA-A2 or PA-A3, Cisco 7500 series router with PA-A6, and a Cisco 7200 series router with PA-A6. All VCs within a CBR VP tunnel have to be of the same service category.
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Shaped VP tunnels are first supported in Cisco IOS Software Release 11.2(8.0.1)FWA4. Cisco IOS Software Release 11.1 and WA3 release trains do not support shaped VP tunnels.
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For software versions after Cisco IOS Software Release 11.3(0.8)TWA4, it is supported for a service category of VCs within a shaped VP tunnel to be on CBR.
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Earlier software versions that support shaped VP tunnel VCs within a shaped CBR tunnel have to be of the CBR service category.
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Hierarchical VP tunnels of the CBR service category are supported on LS1010 with FC-PFQ, Catalyst 8510-MSR, and Catalyst 8540-MSR. The minimum software requirement is the W5 train of Cisco IOS.
The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are working in a live network, ensure that you understand the potential impact of any command before using it.
Conventions
For more information on document conventions, refer to Cisco Technical Tips Conventions.
Configure VP Switching
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .
Network Diagram
This section uses the network setup shown in the diagram below.
Configurations
This section uses these configurations.
| ATM5/1/0-R1 |
|---|
interface ATM5/1/0 no ip address no atm ilmi-keepalive ! interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 10/20 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 10/30 encapsulation aal5snap ! interface ATM5/1/0.3 point-to-point ip address 3.1.1.1 255.255.255.0 pvc 11/40 |
| ATM0/0/1-S1 |
|---|
interface ATM0/0/1 no ip address atm pvp 10 interface ATM0/0/0 10 atm pvp 11 interface ATM0/0/0 11 |
| ATM0/0/1-S2 |
|---|
interface ATM0/0/1 no ip address atm pvp 10 interface ATM0/0/0 10 atm pvp 12 interface ATM0/0/0 11 |
| ATM0/0/0-R2 |
|---|
interface ATM0/0/0 no ip address no atm ilmi-keepalive ! interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 10/20 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 10/30 encapsulation aal5snap ! interface ATM0/0/0.3 point-to-point ip address 3.1.1.2 255.255.255.0 pvc 12/40 encapsulation aal5snap |
Verify
This section provides information you can use to confirm your configuration is working properly.
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
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show atm vp - Verifies that the VP tunnel is up.
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show atm vp traffic interface atm0/0/0 - Verifies the ATM layer connection information about the virtual path.
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show atm vp interface atm0/0/0 10 - Verifies all the VPs that go through the VP tunnel with VPIs.
This is sample command output for the show atm vp command.
Switch#show atm vp Interface VPI Type X-Interface X-VPI Status ATM0/0/0 10 PVP ATM0/0/1 10 UP ATM0/0/0 11 PVP ATM0/0/1 12 UP ATM0/0/1 10 PVP ATM0/0/0 10 UP ATM0/0/1 12 PVP ATM0/0/0 11 UP
This is sample command output for the show atm vp traffic interface atm0/0/0 command.
Switch#show atm vp traffic interface atm0/0/0 Interface VPI Type rx-cell-cnts tx-cell-cnts ATM0/0/0 10 PVP 70 60 ATM0/0/0 11 PVP 94 90
This is sample command output for the show atm vp interface atm0/0/0 10 command.
Switch#show atm vp interface atm0/0/0 10 Interface: ATM0/0/0, Type: oc3suni VPI = 10 Status: UP Time-since-last-status-change: 00:58:11 Connection-type: PVP Cast-type: point-to-point Cross-connect-interface: ATM0/0/1, Type: oc3suni Cross-connect-VPI = 10 Rx connection-traffic-table-index: 1 Rx service-category: UBR (Unspecified Bit Rate) Rx pcr-clp01: 7113539 Rx scr-clp01: none Rx mcr-clp01: none Rx cdvt: 1024 (from default for interface) Rx mbs: none Tx connection-traffic-table-index: 1 Tx service-category: UBR (Unspecified Bit Rate) Tx pcr-clp01: 7113539 Tx scr-clp01: none Tx mcr-clp01: none Tx cdvt: none Tx mbs: none
Configure Regular or Unshaped VP Tunnels
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .
Network Diagram
This section uses the network setup shown in the diagram below.
Configurations
This section describes the configurations for regular or unshaped VP tunnels. This example shows a permanent virtual path (PVP) created to go accross a WAN cloud.
This section uses these configurations.
| Router 1 |
|---|
interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 100/33 encapsulation aal5snap |
| Switch 1 |
|---|
interface ATM0/0/0 no ip address atm pvp 100 ! interface ATM0/0/0.100 point-to-point no ip directed-broadcast no atm ilmi-keepalive ! interface ATM0/0/1 no ip address no ip directed-broadcast logging event subif-link-status atm ilmi-keepalive atm svcc vci min 100 atm pvc 100 32 interface ATM0/0/0.100 100 32 atm pvc 100 33 interface ATM0/0/0.100 100 33 |
| Switch 2 |
|---|
interface ATM0/0/0 no ip address atm pvp 100 ! interface ATM0/0/0.100 point-to-point ! interface ATM0/0/1 no ip address atm pvc 100 32 interface ATM0/0/0.100 100 32 atm pvc 100 40 interface ATM0/0/0.100 100 33 ! |
| Router 2 |
|---|
interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 100/40 encapsulation aal5snap ! |
Verify
This section provides information you can use to confirm your configuration is working properly.
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
-
show atm vp - Verifies that the VP tunnel is up.
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show atm vp traffic interface atm0/0/0 - Verifies the ATM layer connection information about the virtual path.
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show atm vp interface atm0/0/0 100 - Verifies all the VPs that go through the VP tunnel with VPIs.
This is sample command output for the show atm vp interface atm 0/0/0 100 command.
Switch#show atm vp interface atm 0/0/0 100 Interface: ATM0/0/0, Type: oc3suni VPI = 100 Status: TUNNEL Time-since-last-status-change: 17:21:32 Connection-type: PVP Cast-type: point-to-point Rx cells: 49968, Tx cells: 50371 Rx connection-traffic-table-index: 1 Rx service-category: UBR (Unspecified Bit Rate) Rx pcr-clp01: 7113539 Rx scr-clp01: none Rx mcr-clp01: none Rx cdvt: 1024 (from default for interface) Rx mbs: none Tx connection-traffic-table-index: 1 Tx service-category: UBR (Unspecified Bit Rate) Tx pcr-clp01: 7113539 Tx scr-clp01: none Tx mcr-clp01: none Tx cdvt: none Tx mbs: none
This is sample command output for the show atm vp command.
Switch#show atm vp Interface VPI Type X-Interface X-VPI Status ATM0/0/0 100 PVP TUNNEL
This is sample command output for the show atm vp traffic interface atm0/0/0 command.
Switch#show atm vp traffic interface atm0/0/0 Interface VPI Type rx-cell-cnts tx-cell-cnts ATM0/0/0 100 PVP 49865 50271
Configure VP Tunnels for a Single Service Category
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .
Network Diagram
This section uses the network setup shown in this diagram.
Configurations
This example shows how to configure a VP tunnel for a single service category. Notice that traffic shaping is enabled in the ATM interfaces of the routers using variable bit rate non real time (vbr-nrt).
This section uses these configurations.
| Router 1 |
|---|
interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 vbr-nrt 50000 40000 100 encapsulation aal5snap ! ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 100/33 vbr-nrt 10000 8000 100 encapsulation aal5snap ! |
| Switch 1 |
|---|
interface ATM0/0/0 no ip address atm pvp 100 rx-cttr 7 tx-cttr 7 ! interface ATM0/0/0.100 point-to-point no ip directed-broadcast no atm ilmi-keepalive ! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 8 tx-cttr 8 interface ATM0/0/0.100 100 32 atm pvc 100 33 rx-cttr 9 tx-cttr 9 interface ATM0/0/0.100 100 33 |
| Switch 2 |
|---|
interface ATM0/0/0 no ip address atm pvp 100 rx-cttr 7 tx-cttr 7 ! interface ATM0/0/0.100 point-to-point ! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 8 tx-cttr 8 interface ATM0/0/0.100 100 32 atm pvc 100 40 rx-cttr 9 tx-cttr 9 interface ATM0/0/0.100 100 33 |
| Router 2 |
|---|
interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 vbr-nrt 50000 40000 100 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 100/40 vbr-nrt 10000 8000 100 encapsulation aal5snap |
Verify
This section provides information you can use to confirm your configuration is working properly.
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
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show atm vp interface atm0/0/0 100 - Verifies all the VPs that go through the VP tunnel with VPIs.
c8510m-r2#show atm vp int atm 0/0/0 100 Interface: ATM0/0/0, Type: oc3suni VPI = 100 Status: TUNNEL Time-since-last-status-change: 00:43:49 Connection-type: PVP Cast-type: point-to-point Rx connection-traffic-table-index: 7 Rx service-category: VBR-NRT (Non-Realtime Variable Bit Rate) Rx pcr-clp01: 100000 Rx scr-clp0 : 80000 Rx mcr-clp01: none Rx cdvt: 1024 (from default for interface) Rx mbs: 100 Tx connection-traffic-table-index: 7 Tx service-category: VBR-NRT (Non-Realtime Variable Bit Rate) Tx pcr-clp01: 100000 Tx scr-clp0 : 80000 Tx mcr-clp01: none Tx cdvt: none Tx mbs: 100
Configure Shaped VP Tunnels
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .
If the VP Service Provider polices, the connection most likely experiences cell drops in the Service Provider network. The best way to overcome this is to configure shaped VP tunnels.
Shaped VP tunnels are VP tunnels that are traffic shaped. They are defined only for the CBR service category on Cisco Enterprise ATM Switches. All VCs within a single VP tunnel must be the same service category. The overall output of this VP tunnel is rate-limited by hardware to the PCR of the tunnel.
Network Diagram
This section uses the network setup shown in this diagram.
Configurations
This section describes the configurations for shaped VP tunnels and uses these configurations.
| Switch 1 |
|---|
atm connection-traffic-table-row index 10 cbr pcr 8000 atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100 atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0 ! interface ATM0/0/0 no ip address atm pvp 100 shaped rx-cttr 10 tx-cttr 10 atm pvp 110 shaped rx-cttr 10 tx-cttr 10 atm pvp 120 shaped rx-cttr 10 tx-cttr 10 ! interface ATM0/0/0.100 point-to-point atm cac service-category cbr deny atm cac service-category vbr-nrt permit ! interface ATM0/0/0.110 point-to-point atm cac service-category cbr deny atm cac service-category ubr permit ! interface ATM0/0/0.120 point-to-point atm cac service-category cbr deny atm cac service-category abr permit ! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM0/0/0.100 100 32 atm pvc 110 40 rx-cttr 30 tx-cttr 30 interface ATM0/0/0.110 110 40 atm pvc 120 50 rx-cttr 40 tx-cttr 40 interface ATM0/0/0.120 120 50 |
| Switch 2 |
|---|
atm connection-traffic-table-row index 10 cbr pcr 8000 atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100 atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0 ! interface ATM0/0/0 no ip address atm pvp 100 shaped rx-cttr 10 tx-cttr 10 atm pvp 110 shaped rx-cttr 10 tx-cttr 10 atm pvp 120 shaped rx-cttr 10 tx-cttr 10 ! interface ATM0/0/0.100 point-to-point atm cac service-category cbr deny atm cac service-category vbr-nrt permit ! interface ATM0/0/0.110 point-to-point atm cac service-category cbr deny atm cac service-category ubr permit ! interface ATM0/0/0.120 point-to-point no atm ilmi-keepalive atm cac service-category cbr deny atm cac service-category abr permit ! interface ATM0/0/1 no ip address atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM0/0/0.100 100 32 atm pvc 110 40 rx-cttr 30 tx-cttr 30 interface ATM0/0/0.110 110 40 atm pvc 120 50 rx-cttr 40 tx-cttr 40 interface ATM0/0/0.120 120 50 |
| Router 1 |
|---|
interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 110/40 ubr 8000 ! interface ATM5/1/0.3 point-to-point ip address 3.1.1.1 255.255.255.0 pvc 120/50 abr 8000 5000 |
| Router 2 |
|---|
interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 110/40 ubr 8000 ! interface ATM0/0/0.3 point-to-point ip address 3.1.1.2 255.255.255.0 pvc 120/50 abr 8000 5000 |
Verify
This section provides information you can use to confirm your configuration is working properly.
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
-
show atm vp interface atm0/0/0 - Verifies all the VPs that go through the VP tunnel with VPIs.
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show atm vp traffic interface atm0/0/0 - Verifies the ATM layer connection information about the virtual path.
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show atm interface atm0/0/0.110 - Displays information about the ATM interface.
This is sample command output for the show atm vp interface atm 0/0/0 command.
Switch#show atm vp interface atm0/0/0 Interface VPI Type X-Interface X-VPI Status ATM0/0/0 100 PVP SHAPED TUNNEL ATM0/0/0 110 PVP SHAPED TUNNEL ATM0/0/0 120 PVP SHAPED TUNNEL
This is sample command output for the show atm vp traffic interface atm0/0/0 command.
Switch#show atm vp traffic interface atm0/0/0 Interface VPI Type rx-cell-cnts tx-cell-cnts ATM0/0/0 100 PVP 1438 1446 ATM0/0/0 110 PVP 1374 1384 ATM0/0/0 120 PVP 755 772
This is sample command output for the show atm interface atm0/0/0.110 command.
Switch#show atm interface atm0/0/0.110 Interface: ATM0/0/0.110 Port-type: vp tunnel IF Status: UP Admin Status: up
Restrictions for Shaped VP Tunnels
This list describes restrictions related to shaped VP tunnels.
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LS1010 with FC-PFQ and Catalyst 8510-MSR support a maximum of 2x64=128 shaped VP tunnels. 64 shaped VP tunnels are supported on x/0/y numbered ports and 64 on x/1/y numbered ports.
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Catalyst 8540-MSR supports a maximum of 8x64=512 shaped VP tunnels. A maximum of 64 shaped VP tunnels can be defined on each of these interface groups:
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(0/0/x, 1/0/x)
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(0/1/x, 1/1/x)
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(2/0/x, 3/0/x)
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(2/1/x, 3/1/x)
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(9/0/x, 10/0/x)
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(9/1/x, 10/1/x)
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(11/0/x, 12/0/x)
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(11/1/x, 12/1/x)
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The bandwidth of the shaped VP tunnel is shared by the active VCs inside the tunnel in strict round-robin (RR) fashion.
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Shaped VP tunnels do not support merged VCs for tag switching.
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Unspecified bit rate (UBR)+ and available bit rate (ABR) VCs with non-zero minimum cell rate (MCR) are not allowed on a shaped VP tunnel interface.
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A maximum of 128 VCs can transit an s-shaped VP tunnel interface.
Configure Hierarchical VP Tunnels for Multiple Service Categories
In this section, you are presented with the information to configure the features described in this document.
Note: To find additional information on the commands used in this document, use the Command Lookup Tool (registered customers only) .
A hierarchical VP tunnel configuration is used if you have more than one service category and cannot buy more than one VP tunnel. A hierarchical VP tunnel is a VP tunnel that is traffic shaped and supports VCs of multiple service categories to co-exist in a tunnel at the same time.
Network Diagram
This section uses the network setup shown in the diagram below.
Configurations
This section describes the configurations for hierarchical VP tunnels for multiple services categories and uses these configurations.
| Switch 1 |
|---|
atm hierarchical-tunnel atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100 atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0 atm connection-traffic-table-row index 50 cbr pcr 50000 ! interface ATM0/0/0 no ip address no ip directed-broadcast logging event subif-link-status atm pvp 100 hierarchical rx-cttr 50 tx-cttr 50 ! interface ATM0/0/0.100 point-to-point no ip directed-broadcast no atm ilmi-keepalive ! interface ATM0/0/1 no ip address no ip directed-broadcast logging event subif-link-status atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM0/0/0.100 100 32 atm pvc 100 40 rx-cttr 30 tx-cttr 30 interface ATM0/0/0.100 100 40 atm pvc 100 50 rx-cttr 40 tx-cttr 40 interface ATM0/0/0.100 100 50 |
| Switch 2 |
|---|
atm hierarchical-tunnel atm connection-traffic-table-row index 20 vbr-nrt pcr 7000 scr0 4000 mbs 100 atm connection-traffic-table-row index 30 ubr pcr 8000 atm connection-traffic-table-row index 40 abr pcr 8000 mcr 0 atm connection-traffic-table-row index 50 cbr pcr 50000 ! interface ATM2/1/0 no ip address atm pvp 100 hierarchical rx-cttr 50 tx-cttr 50 ! interface ATM2/1/0.100 point-to-point ! interface ATM2/1/1 no ip address atm pvc 100 32 rx-cttr 20 tx-cttr 20 interface ATM2/1/0.100 100 32 atm pvc 100 40 rx-cttr 30 tx-cttr 30 interface ATM2/1/0.100 100 40 atm pvc 100 50 rx-cttr 40 tx-cttr 40 interface ATM2/1/0.100 100 50 |
| Router 1 |
|---|
interface ATM5/1/0.1 point-to-point ip address 1.1.1.1 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM5/1/0.2 point-to-point ip address 2.1.1.1 255.255.255.0 pvc 100/40 ubr 8000 encapsulation aal5snap ! interface ATM5/1/0.3 point-to-point ip address 3.1.1.1 255.255.255.0 pvc 100/50 abr 8000 5000 encapsulation aal5snap |
| Router 2 |
|---|
interface ATM0/0/0.1 point-to-point ip address 1.1.1.2 255.255.255.0 pvc 100/32 vbr-nrt 7000 4000 100 encapsulation aal5snap ! interface ATM0/0/0.2 point-to-point ip address 2.1.1.2 255.255.255.0 pvc 100/40 ubr 8000 encapsulation aal5snap ! interface ATM0/0/0.3 point-to-point ip address 3.1.1.2 255.255.255.0 pvc 100/50 abr 8000 5000 encapsulation aal5snap |
Verify
This section provides information you can use to confirm your configuration is working properly.
Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.
-
show atm vp - Verifies that the VP tunnel is up.
-
show atm resource - Displays global resource manager configuration and status.
-
show atm vp traffic interface atm2/1/0 100 - Verifies the ATM layer connection information about the virtual path.
-
show atm vp interface atm2/1/0 100 - Verifies all the VPs that go through the VP tunnel with VPIs.
This is sample command output for the show atm vp command.
Switch#show atm vp Interface VPI Type X-Interface X-VPI Status ATM2/1/0 100 PVP HIE. TUNNEL
This is sample command output for the show atm resource command.
Switch#show atm resource
Resource configuration:
Sustained-cell-rate-margin-factor 1%
Abr-mode: EFCI
Hierarchical Scheduling Mode : enabled
!--- Truncated.
This is sample command output for the show atm vp traffic interface atm2/1/0 100 command.
Switch#show atm vp traffic interface atm 2/1/0 100 Interface VPI Type rx-cell-cnts tx-cell-cnts ATM2/1/0 100 PVP 2451 2470
This is sample command output for the show atm vp interface atm2/1/0 100 command.
Switch#show atm vp interface atm2/1/0 100 Interface: ATM2/1/0, Type: oc3suni VPI = 100 Status: HIE. TUNNEL Time-since-last-status-change: 00:49:16 Connection-type: PVP Cast-type: point-to-point Rx cells: 2214, Tx cells: 2234 Rx connection-traffic-table-index: 50 Rx service-category: CBR (Constant Bit Rate) Tx connection-traffic-table-index: 50 Tx service-category: CBR (Constant Bit Rate) Tx pcr-clp01: 50000 Tx scr-clp01: none Tx mcr-clp01: none Tx cdvt: none Tx mbs: none
Restriction for Hierarchical VP Tunnels
This list describes restrictions related to hierarchical VP tunnels.
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LS1010 with FC-PFQ, Catalyst 5500 with ATM Switch Processor (ASP) and FC-PFQ, and Catalyst 8510-MSR support a maximum of 62 hierarchical VP tunnels.
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Hierarchical VP tunnels can only be defined on ports in slots 0 and 3 on LS1010 and Catalyst 8510-MSR. Hierarchical VP tunnels can be defined in slots 9 and 11 on Catalyst 5500 with ASP and FC-PFQ.
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LS1010 equipped with FC-PFQ and ASP-B supports a maximum of 30 hierarchical VP tunnels on ports 0/0/z and 3/0/z combined, and a maximum of 32 on ports 0/1/z and 3/1/z combined. Use the show hardware command to find out the type of ASP and feature card.
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LS1010 equipped with FC-PFQ and ASP-C as well as Catalyst 8510-MSR support a maximum of 30 hierarchical VP tunnels on ports 0/y/z and a maximum of 32 on ports 3/y/z.
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On a Catalyst 5500 with ASP and FC-PFQ with a maximum of 30, hierarchical VP tunnels can be defined on ports 9/0/z and 11/0/7 combined. A maximum of 32 hierarchical VP tunnels can be defined on ports 9/1/z and 11/1/z combined.
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On a Catalyst 8540-MSR, hierarchical VP tunnels can be defined on slots 0,2,9, and 11.
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The maximum number of hierarchical VP tunnels varies between 120 and 240 depending on the type of port adapter modules (PAMs) used. If all the ports are super PAMs (full with modules), the maximum number of VP tunnels supported is 240. If all the ports installed are super CAMs with LS1010, the PAM's maximum number of hierarchical VP tunnels is 120.
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Hierarchical VP tunnels cannot co-exist with any other type of connection (VCs, VPs, Tag VCs, regular or shaped VP tunnels, and so forth) on the same physical interface. Therefore, the only type of connection that can co-exist with hierarchical VP tunnels on the same physical interface are additional hierarchical VP tunnels and well known VCs (signaling 0/5, PNNI, 0/18, ILMI 0/16, and so forth).
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Hierarchical VP tunnels can only support either ATM Forum VCs or Tag VCs, but not both at the same time.
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When you perform on line insertion and removal (OIR) of PAM that has hierarchical VP tunnels configured for its ports, configuration of the hierarchical tunnel is preserved. If the same PAM is inserted back in, the hierarchical VP tunnel is automatically active. However, if a different type of PAM is to be inserted, it is strongly recommended that any configured hierarchical VP tunnel (on the port about to be removed) be deleted prior to the physical removal of PAM.
Troubleshoot
There is currently no troubleshooting information available for this document.
Related Information
- Troubleshooting VP Tunnels
- Understanding VP Tunnels and VP Switching
- LANE, CES, and VBR PVCs in Shaped VP Tunnels
- LANE and CES (Using PVCs) in Unshaped VP Tunnels
- LANE and CES (Using PVCs) Through Hierarchical VP Tunnels
- VBR, UBR and ABR Soft PVCs in Shaped Tunnels
- ATM Technology Support Pages
- Technical Support - Cisco Systems
- Tools and Utilities - Cisco Systems
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