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ATM Traffic Management

VBR, UBR and ABR Soft PVCs in Shaped Tunnels

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Document ID: 9204


Contents

Introduction
Prerequisites
      Requirements
      Components Used
      Conventions
Configure
      VP Tunnel Restrictions
      Network Diagram
      Configurations
Verify
Troubleshoot
Related Information

Introduction

This document provides a sample configuration for passing variable bit rate (VBR), available bit rate (ABR) and unspecified bit rate (UBR) traffic across a WAN link using shaped virtual path (VP) tunnels on a LightStream 1010 or Catalyst 8500 ATM switch.

Note: VP tunnels must be in the constant bit rate (CBR) category in order to be shaped. Shaped VP tunnels cannot simultaneously transport virtual circuits (VCs) of multiple categories. In this example, there are three VP tunnels, one for each ATM service category (VBR, UBR, and ABR).

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

Shaped VP tunnels in the CBR service category are supported on the following hardware platforms:

  • LightStream 1010 with feature card per flow queuing (FC-PFQ).

  • Catalyst 8510-MSRs.

  • Catalyst 8540-MSRs.

Note: All VCs within CBR VP tunnels must be of the same service category.

Software support for shaped VP tunnels is as follows:

  • Cisco IOS® Software Release 11.2(8.0.1) FWA4 introduced support for shaped VP tunnels.

  • Cisco IOS Software 11.1 and WA3 release trains do not support shaped VP tunnels.

  • For Cisco IOS software releases after 11.3(0.8) TWA4, shaped VP tunnels are supported for non-CBR service category VCs within a shaped tunnel.

  • For earlier Cisco IOS software releases that do support shaped VP tunnels, VCs within shaped CBR tunnels must be in the CBR service category.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, refer to Cisco Technical Tips Conventions.

Configure

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) .

VP Tunnel Restrictions

  • LightStream 1010s with FC-PFQ and Catalyst 8510-MSRs support a maximum of 2 x 64 = 128 shaped VP tunnels: 64 shaped VP tunnels on x/0/y numbered ports and 64 on x/1/y numbered ports.

  • Catalyst 8540-MSRs support a maximum of 8 x 64 = 512 shaped VP tunnels. You can define a maximum of 64 shaped VP tunnels on each of the following interface groups: (0/0/x, 1/0/x), (0/1/x, 1/1/x), (2/0/x, 3/0/x), (2/1/x,3/1/x), (9/0/x, 10/0/x), (9/1/x, 10/1/x), (11/0/x, 12/0/x), and (11/1/x, 12/1/x).

  • The bandwidth of the shaped VP tunnel is shared by the active VCs inside the tunnel in a strict round-robin fashion.

  • Shaped VP tunnels do not support merged VCs for tag switching.

  • UBR+ and ABR VCs with non-zero minimum cell rates (MCRs) are not allowed on a shaped VP tunnel interface.

  • A maximum of 128 VCs can travel along a shaped VP tunnel interface.

Network Diagram

In this configuration, the LS1010-MID switch serves as the WAN link.

This document uses this network setup:

vp-tunnel-1.gif

Configurations

Router A

 
interface ATM1/0 
  no ip address 
  no ip route-cache cef 
  logging event subif-link-status 
  load-interval 30 
  no atm ilmi-keepalive 
! 
interface ATM1/0.1 point-to-point 
  ip address 10.10.10.2 255.255.255.0 
  pvc 11/800 
   vbr-nrt 7000 4000 
! 
! 
interface ATM1/0.2 point-to-point 
  ip address 20.20.20.2 255.255.255.0 
  PVC 30/900 
   ubr 7000 
! 
interface ATM1/0.3 point-to-point 
  ip address 30.30.30.2 255.255.255.0 
  PVC 40/1000 
   abr 7000 4000

LS1010-2

 
ATM connection-traffic-table-row index 50 cbr pcr 7200 
ATM connection-traffic-table-row index 60 vbr-nrt pcr 7000 scr0 4000  mbs 100 
ATM connection-traffic-table-row index 90 ubr pcr 7200 
ATM connection-traffic-table-row index 95 abr pcr 7000  mcr 0 
ATM address 47.0091.8100.0000.0040.0b0a.1b81.0040.0b0a.1b81.00 
ATM router pnni 
  no aesa embedded-number left-justified 
  node 1 level 56 lowest 
   redistribute ATM-static 
! 
! 
! 
interface ATM0/0/0 
  no ip address 
  no ip directed-broadcast 
  no ATM auto-configuration 
  no ATM ilmi-keepalive 
  ATM nni 
  ATM pvp 10 shaped rx-cttr 50 tx-cttr 50 
  ATM pvp 20 shaped rx-cttr 50 tx-cttr 50 
  ATM pvp 30 shaped rx-cttr 50 tx-cttr 50 
  no ATM signaling enable 
! 
interface ATM0/0/0.10 point-to-point 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM cac service-category cbr deny 
  ATM cac service-category vbr-nrt permit 
! 
interface ATM0/0/0.20 point-to-point 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM cac service-category cbr deny 
  ATM cac service-category ubr permit 
! 
interface ATM0/0/0.30 point-to-point 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM cac service-category cbr deny 
  ATM cac service-category abr permit 
interface ATM0/0/1 
  no ip address 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM soft-vc 11 800 dest-address 47.0091.8100.0000.0060.5c72.2b01.4000.0c80.0010 
 .00  11 800 rx-cttr 60 tx-cttr 60 
  ATM soft-vc 30 900 dest-address 47.0091.8100.0000.0060.5c72.2b01.4000.0c80.0010 
 .00  30 900 rx-cttr 90 tx-cttr 90 
  ATM soft-vc 40 1000 dest-address 47.0091.8100.0000.0060.5c72.2b01.4000.0c80.001 
 0.00  40 1000 rx-cttr 95 tx-cttr 95

LS1010-MID

 
ATM connection-traffic-table-row index 50 cbr pcr 8000 
ATM address 47.0091.8100.0000.0005.5e8f.3601.0005.5e8f.3601.00 
ATM router pnni 
 no aesa embedded-number left-justified 
 node 1 level 56 lowest 
   redistribute ATM-static 
! 
! 
interface ATM0/1/2 
  no ip address 
  load-interval 30 
  no ATM ilmi-keepalive 
! 
interface ATM0/1/3 
  no ip address 
  load-interval 30 
  no ATM ilmi-keepalive 
  ATM pvp 10 rx-cttr 50 tx-cttr 50  interface  ATM0/1/2 10 
  ATM pvp 20 rx-cttr 50 tx-cttr 50  interface  ATM0/1/2 20 
  ATM pvp 30 rx-cttr 50 tx-cttr 50  interface  ATM0/1/2 30

LS1010-1

 
ATM connection-traffic-table-row index 50 cbr pcr 7200 
ATM connection-traffic-table-row index 60 vbr-nrt pcr 7000 scr0 4000  mbs 100 
ATM connection-traffic-table-row index 90 ubr pcr 7200 
ATM connection-traffic-table-row index 95 abr pcr 7000  mcr 0 
ATM address 47.0091.8100.0000.0060.5c72.2b01.0060.5c72.2b01.00 
ATM router pnni 
  no aesa embedded-number left-justified 
  node 1 level 56 lowest 
   redistribute ATM-static 
! 
! 
! 
interface ATM0/0/0 
  no ip address 
  no ip directed-broadcast 
  no ATM auto-configuration 
  no ATM ilmi-keepalive 
  ATM uni type public side user version 3.1 
  ATM pvp 10 shaped rx-cttr 50 tx-cttr 50 
  ATM pvp 20 shaped rx-cttr 50 tx-cttr 50 
  ATM pvp 30 shaped rx-cttr 50 tx-cttr 50 
  no ATM signaling enable 
! 
interface ATM0/0/0.10 point-to-point 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM cac service-category cbr deny 
  ATM cac service-category vbr-nrt permit 
! 
interface ATM0/0/0.20 point-to-point 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM cac service-category cbr deny 
  ATM cac service-category ubr permit 
! 
interface ATM0/0/0.30 point-to-point 
  no ip directed-broadcast 
  no ATM ilmi-keepalive 
  ATM cac service-category cbr deny 
  ATM cac service-category abr permit 
! 
interface ATM0/0/1 
  no ip address 
  no ip directed-broadcast 
  no ATM ilmi-keepalive

Router B

 
interface ATM1/0/0 
  no ip address 
  no ip route-cache distributed 
  no ip mroute-cache 
  load-interval 30 
  no ATM ilmi-keepalive 
! 
interface ATM1/0/0.1 point-to-point 
  ip address 10.10.10.1 255.255.255.0 
  no ip mroute-cache 
  PVC 11/800 
   vbr-nrt 7000 4000  
! 
interface ATM1/0/0.2 point-to-point 
  ip address 20.20.20.1 255.255.255.0 
  no ip mroute-cache 
  PVC 30/900 
   ubr 7000 
! 
interface ATM1/0/0.3 point-to-point 
  ip address 30.30.30.1 255.255.255.0 
  PVC 40/1000 
   abr 7000 4000

Verify

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 resources—Confirms that hierarchical scheduling is enabled.

  • show atm interface resource atm 0/0/0—Displays allocated resources by all connections on physical interface atmx/y/z. It also shows the total available resources on this interface.

  • show atm vc interface atm 0/0/1—Displays all VCs going through the VP tunnel with virtual path identifier (VPI)=n.

  • show atm interface resource atm 0/1/3—Displays the allocated resources by all connections on physical interface atmx/y/z. It also shows the total available resources on this interface.

  • show atm vp interface atm 0/1/3 10—Displays specific information on the VP tunnel with VPI=n, as illustrated in the sample output below. Be sure to verify that:

    • The STATUS field indicates the correct type of tunnel.

    • The Rx and Tx service category are configured properly and match the category of VP purchased from the service provider.

    • The correct traffic parameters, such as Peak Cell Rate (PCR), sustained cell rate (SCR), minimum cell rate (MCR), cell delay variation tolerance (CDVT) and maximum burst size (MBS).

  • show atm pnni neighbor—Lists the neighboring ATM switches with which the local switch has formed Private Network-to-Network Interface (PNNI) adjacencies. In this configuration, the neighbor is LS1010-1 since the middle switch acts as the WAN or telco connection and signaling is not running in the main interface.

  • ping 10.10.10.1—Verifies connectivity.

LS1010-2#show atm resources  
    Resource configuration: 
    Over-subscription-factor 8  Sustained-cell-rate-margin-factor 1% 
    Abr-mode:   relative-rate 
    Service Category to Threshold Group mapping: 
     cbr 1 vbr-rt 2 vbr-nrt 3 abr 4 ubr 5 
    Threshold Groups: 
    Group Max    Max Q  Min Q  Q thresholds  Cell  Name 
          cells  limit  limit  Mark Discard  count 
          instal instal instal 
    --------------------------------------------------- 
     1    65535  63     63     25 %  87 %      0     cbr-default-tg 
     2    65535  127    127    25 %  87 %      0     vbrrt-default-tg 
     3    65535  511    31     25 %  87 %      0     vbrnrt-default-tg 
     4    65535  511    31     25 %  87 %      0     abr-default-tg 
     5    65535  511    31     25 %  87 %      0     ubr-default-tg 
     6    65535  1023   1023   25 %  87 %      0     well-known-vc-tg
LS1010-2#show atm interface resource atm 0/0/0 

    Resource Management configuration: 
    Service Classes: 
        Service Category map: c1 cbr, c2 vbr-rt, c3 vbr-nrt, c4 abr, c5 ubr 
        Scheduling: RS c1 WRR c2, WRR c3, WRR c4, WRR c5 
        WRR Weight: 8 c2, 1 c3, 1 c4, 1 c5 
    Pacing: disabled   0 Kbps rate configured, 0 Kbps rate installed 
    Service Categories supported: cbr,vbr-rt,vbr-nrt,abr,ubr 
    Link Distance: 0 kilometers 
    Controlled Link sharing: 
        Max aggregate guaranteed services: none RX,  none TX 
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX, 
                       none abr RX, none abr TX, none ubr RX, none ubr TX 
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX, 
                       none abr RX, none abr TX, none ubr RX, none ubr TX 
    Best effort connection limit: disabled  0 max connections 
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times): 
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr 
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr 
        Sustained-cell-rate: none vbr RX, none vbr TX 
        Minimum-cell-rate RX: none abr, none ubr 
        Minimum-cell-rate TX: none abr, none ubr 
        CDVT RX: none cbr, none vbr, none abr, none ubr 
        CDVT TX: none cbr, none vbr, none abr, none ubr 
        MBS: none vbr RX, none vbr TX 
    Resource Management state: 
    Available bit rates (in Kbps): 
        133342 cbr RX, 133342 cbr TX, 133342 vbr RX, 133342 vbr TX, 
        133342 abr RX, 133342 abr TX, 133342 ubr RX, 133342 ubr TX 
    Allocated bit rates: 
        14400 cbr RX, 14400 cbr TX, 0 vbr RX, 0 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX 
    Best effort connections: 0 pvcs,  0 svcs
LS1010-2#show atm interface resource atm 0/0/0.10 

    Resource Management configuration: 
    Service Categories supported: vbr-nrt 
    Link Distance: 0 kilometers 
    Best effort connection limit: disabled  0 max connections 
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times): 
        Peak-cell-rate RX: none vbr, 
        Peak-cell-rate TX: none vbr, 
        Sustained-cell-rate: none vbr RX, none vbr TX 
        Minimum-cell-rate RX: 
        Minimum-cell-rate TX: 
        CDVT RX: none vbr, 
        CDVT TX: none vbr, 
        MBS: none vbr RX, none vbr TX 
    Resource Management state: 
    Available bit rates (in Kbps): 
        0 cbr RX, 0 cbr TX, 2810 vbr RX, 2810 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX 
    Allocated bit rates: 
        0 cbr RX, 0 cbr TX, 4029 vbr RX, 4029 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX
LS1010-2#show atm interface resource atm 0/0/0.20 
  
    Resource Management configuration: 
    Service Categories supported: ubr 
    Link Distance: 0 kilometers 
    Best effort connection limit: disabled  0 max connections 
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times): 
        Peak-cell-rate RX: none ubr 
        Peak-cell-rate TX: none ubr 
        Minimum-cell-rate RX: none ubr 
        Minimum-cell-rate TX: none ubr 
        CDVT RX: none ubr 
        CDVT TX: none ubr 
    Resource Management state: 
    Available bit rates (in Kbps): 
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX 
    Allocated bit rates: 
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX
LS1010-2#show atm interface resource atm 0/0/0.30 

    Resource Management configuration: 
    overbooking :  disabled 
    Service Categories supported: abr 
    Link Distance: 0 kilometers 
    Best effort connection limit: disabled  0 max connections 
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times): 
        Peak-cell-rate RX: none abr, 
        Peak-cell-rate TX: none abr, 
        Minimum-cell-rate RX: none abr, 
        Minimum-cell-rate TX: none abr, 
        CDVT RX: none abr, 
        CDVT TX: none abr, 
    Resource Management state: 
    Available bit rates (in Kbps): 
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX 
    Allocated bit rates: 
        0 cbr RX, 0 cbr TX, 0 vbr RX, 0 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX
LS1010-2#show atm vc interface atm 0/0/1  
Interface         VPI  VCI   Type   X-Interface      X-VPI X-VCI Encap  Status 
ATM0/0/1          0    5     PVC    ATM2/0/0          0    40    QSAAL  UP 
ATM0/0/1          0    16    PVC    ATM2/0/0          0    36    ILMI   UP 
ATM0/0/1          11   800   SoftVC ATM0/0/0.10       10   36           UP 
ATM0/0/1          30   900   SoftVC ATM0/0/0.20       20   36           UP 
ATM0/0/1          40   1000  SoftVC ATM0/0/0.30       30   36           UP
LS1010-MID#show atm interface resource atm 0/1/3 

    Resource Management configuration: 
    Service Classes: 
        Service Category map: c2 cbr, c2 vbr-rt, c3 vbr-nrt, c4 abr, c5 ubr 
        Scheduling: RS c1 WRR c2, WRR c3, WRR c4, WRR c5 
        WRR Weight: 15 c2, 2 c3, 2 c4, 2 c5 
    CAC Configuration to account for Framing Overhead : Disabled 
    Pacing: disabled   0 Kbps rate configured, 0 Kbps rate installed 
    overbooking :  disabled 
    Service Categories supported: cbr,vbr-rt,vbr-nrt,abr,ubr 
    Link Distance: 0 kilometers 
    Controlled Link sharing: 
        Max aggregate guaranteed services: none RX,  none TX 
        Max bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX, 
                       none abr RX, none abr TX, none ubr RX, none ubr TX 
        Min bandwidth: none cbr RX, none cbr TX, none vbr RX, none vbr TX, 
                       none abr RX, none abr TX, none ubr RX, none ubr TX 
    Best effort connection limit: disabled  0 max connections 
    Max traffic parameters by service (rate in Kbps, tolerance in cell-times): 
        Peak-cell-rate RX: none cbr, none vbr, none abr, none ubr 
        Peak-cell-rate TX: none cbr, none vbr, none abr, none ubr 
        Sustained-cell-rate: none vbr RX, none vbr TX 
        Minimum-cell-rate RX: none abr, none ubr 
        Minimum-cell-rate TX: none abr, none ubr 
        CDVT RX: none cbr, none vbr, none abr, none ubr 
        CDVT TX: none cbr, none vbr, none abr, none ubr 
        MBS: none vbr RX, none vbr TX 
    Resource Management state: 
    Available bit rates (in Kbps): 
        131743 cbr RX, 131743 cbr TX, 131743 vbr RX, 131743 vbr TX, 
        131743 abr RX, 131743 abr TX, 131743 ubr RX, 131743 ubr TX 
    Allocated bit rates: 
        16000 cbr RX, 16000 cbr TX, 0 vbr RX, 0 vbr TX, 
        0 abr RX, 0 abr TX, 0 ubr RX, 0 ubr TX 
    Best effort connections: 0 pvcs,  0 svcs
LS1010-MID#show atm vp interface atm 0/1/3 10 

Interface: ATM0/1/3, Type: oc3suni 
VPI = 10 
Status: UP 
Time-since-last-status-change: 5d00h 
Connection-type: PVP 
Cast-type: point-to-point 
Usage-Parameter-Control (UPC): pass 
Wrr weight: 2 
Number of OAM-configured connections: 0 
OAM-configuration: disabled 
OAM-states:  Not-applicable 
Cross-connect-interface: ATM0/1/2, Type: oc3suni 
Cross-connect-VPI = 10 
Cross-connect-UPC: pass 
Cross-connect OAM-configuration: disabled 
Cross-connect OAM-state:  Not-applicable 
Threshold Group: 1, Cells queued: 0 
Rx cells: 275955, TX cells: 468885 
TX Clp0:468885,  TX Clp1: 0 
Rx Clp0:275955,  Rx Clp1: 0 
Rx Upc Violations:0, Rx cell drops:0 
Rx Clp0 q full drops:0, Rx Clp1 qthresh drops:0 
Rx connection-traffic-table-index: 50 
Rx service-category: CBR (Constant Bit Rate) 
Rx pcr-clp01: 8000 
Rx scr-clp01: none 
Rx mcr-clp01: none 
Rx      cdvt: 1024 (from default for interface) 
Rx       mbs: none 
TX connection-traffic-table-index: 50 
TX service-category: CBR (Constant Bit Rate) 
TX pcr-clp01: 8000 
TX scr-clp01: none 
TX mcr-clp01: none 
TX      cdvt: none 
TX       mbs: none
LS1010-2#show atm pnni neighbor 

Neighbors For Node (Index 1, Level 56) 

  Neighbor Name: LS1010-1, Node number: 9 
  Neighbor Node Id: 56:160:47.00918100000000605C722B01.00605C722B01.00
  
!--- LS1010-1 address
 
  Neighboring Peer State: Full 
  Link Selection For CBR    : minimize blocking of future calls 
  Link Selection For VBR-RT : minimize blocking of future calls 
  Link Selection For VBR-NRT: minimize blocking of future calls 
  Link Selection For ABR    : balance load 
  Link Selection For UBR    : balance load 
   Port                      Remote Port Id            Hello state 
   ATM0/0/0.30               ATM0/0/0.30               2way_in 
   ATM0/0/0.20               ATM0/0/0.20               2way_in 
   ATM0/0/0.10               ATM0/0/0.10               2way_in  (Flood Port)
Router-A#ping 10.10.10.1 

Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 10.10.10.1, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms 

Router-A#ping 20.20.20.1 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 20.20.20.1, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms 

Router-A#ping 30.30.30.1 
Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 30.30.30.1, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

Troubleshoot

There is currently no specific troubleshooting information available for this configuration.

Related Information

Updated: Oct 14, 2009 Document ID: 9204