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Configuring ATM PVCs and PVCs with Traffic Shaping

Configuring ATM PVCs and PVCs with Traffic Shaping

This chapter describes how to configure permanent virtual connection (PVC)-supported virtual LANs (VLANs) and PVC-supported VLANs with traffic shaping for the Catalyst 5000 series ATM modules.

Note For complete information on installing Catalyst 5000 series ATM modules, refer to the Catalyst 5000 Series Module Installation Guide.
Note For complete syntax and usage information for the commands used in this chapter, refer to the Catalyst  5000 Series Command Reference publication.

This chapter consists of these sections:

Understanding How ATM PVC Traffic Shaping Works

PVC-based ATM links allow Catalyst  5000 series switches to connect to each other through ATM interfaces over PVCs. You can configure one or more PVCs for each VLAN on every Catalyst  5000 series ATM module. Connectivity can be back-to-back or through an ATM switch cloud, using RFC 1483-compliant, bridged Logical Link Control/Subnetwork Access Protocol (LLC/SNAP) packet encapsulation.

When you create a PVC, you create a virtual channel descriptor (VCD) and attach it to the virtual path identifier (VPI) and virtual channel identifier (VCI). A VCD identifies the VPI-VCI pair for a particular packet. The ATM module requires this feature to manage packet transmission. The number chosen for the VCD is independent of the VPI-VCI pair used.

To use PVCs, you must configure PVCs in both the Catalyst  5000 series ATM module and the ATM switch cloud. PVCs remain active until the circuit is removed from either configuration.

PVCs are compatible with switched virtual connection (SVC)-based LAN Emulation (LANE), with the following restrictions:

You can configure PVCs with Catalyst  5000 series ATM software release 3.2 or with ATM PVC traffic-shaping software release 50.1 or 51.1. Software releases 50.1 and 51.1 allow you to configure a VLAN to run over PVCs so that you can specify a cell rate for traffic flow.

Note Software releases 50.1 and 51.1 are separate images from the Catalyst  5000 series LANE/MPOA software; software releases 50.1 and 51.1 do not support traffic shaping with LANE and support only RFC 1483-bridged Ethernet SNAP-encapsulated PVCs with peak cell-rate shaping.

Caution The ATM single PHY OC-3, dual PHY OC-3, and dual PHY DS3 modules require compatible releases of the Catalyst 5000 series supervisor engine and ATM PVC traffic-shaping software. See Table 9-1 for a list of ATM modules and compatible software releases.


Table 9-1: ATM Module Software Release Compatibility
Module Product Number Supervisor Engine Software Release ATM PVC Software Release

ATM Single PHY OC-3

WS-X5153 WS-X5154 WS-X5155

1.6 or above

50.1(1) or above

ATM Dual PHY OC-3

WS-X5156 WS-X5157 WS-X5158

2.1(5) or above

50.1(1) or above

ATM Dual PHY DS3

WS-X5166

3.1 or above

51.1(2) or above

Note The ATM dual PHY OC-3 modules (WS-X5167 and WS-X5168) and the ATM dual PHY OC-12 modules (WS-X5161 and WS-X5162) do not support the ATM PVC traffic-shaping software.

Figure 9-1 shows two Catalyst  5000 series switches with ATM dual PHY DS3 modules in a redundant configuration running ATM PVC traffic-shaping software. The ATM dual PHY DS3 modules contain ten rate queues. Twenty-four PVCs are divided among the ten rate queues; each specifies a particular cell rate for the PVC set attached to it. In this example, PVC  1 through PVC  7 are in VLAN 1, PVC  8 through PVC  20 are in VLAN 2, and PVC  21 through PVC  24 are in VLAN  3.

To configure ATM PVC traffic shaping, you must assign a specified cell rate to a PVC. The software places the PVC to which the cell rate has been assigned in a dynamically created rate queue. The software creates rate queues, and you can assign each queue a unique cell-rate value.

Ten rate queues are available on any ATM module. However, the allowable peak cell rate (PCR) range varies depending on the software release and ATM module you are using, as follows:

You can configure up to 4096 PVCs on the ATM module. In addition, you can divide the PVCs attached to the rate queues among different VLANs. Traffic shaping supports only PCR.

If you enable VLAN Trunk Protocol (VTP) in the ATM module, the ATM module creates LAN Emulation Clients (LECs) for each VLAN configured on the supervisor engine module. The ATM module software also deletes a previously existing LEC for a particular VLAN when that LEC is configured to run over a PVC.


Figure 9-1: ATM PVC Traffic Shaping with the ATM Dual PHY DS3 Module


Default ATM PVC Traffic-Shaping Configuration

Table 9-2 shows the default ATM PVC traffic-shaping configuration.


Table 9-2: Default Fast Ethernet and Gigabit Ethernet Trunk Configuration
Feature Default Configuration

Clock internal

Transmit clock is generated internally

ATM framing

C-Bit with ADM

Line buildout

Short

DS3-scramble

Disabled

Configuring PVC-Supported VLANs

These sections describe how to configure PVC-supported VLANs on the Catalyst 5000 series ATM modules:

Setting Up PVCs in the ATM Cloud

To configure a PVC within the ATM cloud, refer to the documentation from your ATM switch vendor.

Configuring a PVC-Supported VLAN

To set up a PVC-supported VLAN on the ATM module, perform this task in privileged mode:
Task Command

Step 1 On the Catalyst 5000 series switch, assign an Ethernet port to the desired VLAN.

set vlan vlan_num mod_num/port_num

Step 2 Establish a connection to the ATM module.

session mod_num

Step 3 Activate privileged mode on the ATM module.

enable

Step 4 Enter configuration mode.

configure terminal

Step 5 Select the ATM interface.

interface atm0

Step 6 Set up the PVCs.

atm pvc vcd vpi vci aal5snap

Step 7 Bind the PVCs to the VLAN.

atm bind pvc vlan vcd vlan_num

Step 8 (Optional) Set up other PVCs for the same VLAN if needed by repeating Steps 6 and 7.

Step 9 Exit configuration mode.

Ctrl-Z

Step 10 Verify the PVC configuration.

show atm vlan
show atm vc

Step 11 Save the configuration.

write memory

Configuring a PVC-Supported VLAN with Traffic-Shaping

Note Traffic shaping requires software release  50.1 or release  51.1.

To configure a PVC-supported VLAN with ATM PVC traffic-shaping, perform this task in privileged mode:
Task Command

Step 1 Assign an Ethernet port to the desired VLAN.

set vlan vlan_num mod_num/port_num

Step 2 Establish a connection to the ATM module.

session mod_num

Step 3 Activate privileged mode on the ATM module.

enable

Step 4 Enter configuration mode.

configure terminal

Step 5 Select the ATM interface.

interface atm0

Step 6 (Optional) Customize the interface configuration if needed.

atm clock internal
atm framing [m23adm | cbitplcp | m23plcp]
atm lbo {short | long}
atm ds3-scramble

Step 7 Set up the PVCs, indicating the desired peak cell rate.

atm pvc vcd vpi vci [aal-encap] aal5snap1 peak2 [oam seconds]

Step 8 Bind the PVCs to the VLAN.

atm bind pvc vlan vcd vlan_num3

Step 9 Set up other PVCs for the same VLAN if needed by repeating Steps 6 through 8.

Step 10 Exit configuration mode.

Ctrl-Z

Step 11 Verify the setup.

show atm vlan
show atm vc

Step 12 Write the configuration to NVRAM.

write memory

1To configure traffic shaping, you must use the aal5snap options.
2The peak argument must not exceed 45000 for DS3 modules or 155000 for OC-3 modules.
3The atm bind pvc vlan vcd vlan_num command is valid only for the current software release; this command may change in future releases.

Note The atm bind pvc vlan vcd vlanid command is valid only for the current software release. The atm traffic-shape rate command is not available in software releases  50.1 or  51.1.

Unbinding or Removing PVCs from a VLAN

You can unbind and remove a previously assigned PVC from a VLAN. You can also unbind a previously assigned PVC from a VLAN without removing the PVC itself. If you do not remove the PVC itself, you can bind the PVC to a different VLAN.

Note The procedures in this section apply to ATM software release 4.1 and ATM PVC traffic-shaping software release 50.1.

To remove a previously assigned PVC from a VLAN, perform this task in privileged mode:
Task Command

Step 1 Enter privileged mode on the ATM module.

enable

Step 2 Enter configuration mode.

configure terminal

Step 3 Select the ATM interface.

interface atm0

Step 4 Remove the PVC from the VLAN.

no atm pvc vcd

Step 5 End the session.

Ctrl-Z

To unbind a previously assigned PVC from a VLAN without removing the PVC itself, perform this task in privileged mode:
Task Command

Step 1 Activate privileged mode on the ATM module.

enable

Step 2 Enter configuration mode.

configure terminal

Step 3 Select the ATM interface.

interface atm0

Step 4 Unbind the PVC from the VLAN.

no atm bind pvc vlan vcd vlan_num

Step 5 End the session.

Ctrl-Z

ATM PVC Traffic-Shaping Configuration Examples

These sections show ATM PVC traffic-shaping configuration examples:

Nonredundant Configuration Traffic-Shaping Example

This example configuration describes how to configure a nonredundant PVC-supported VLAN configuration with traffic-shaping. Figure 9-2 shows the network used in this example. Assume that the ATM module in each Catalyst 5000 series switch is in slot 2. This example applies to both the single and dual PHY OC-3 ATM modules and the dual PHY DS3 ATM module.


Figure 9-2: Nonredundant Configuration Traffic-Shaping Example Network


Table 9-3 shows the VLAN and switch connections, VPIs, VCIs, and traffic rates for the network shown in Figure 9-3:


Table 9-3: PVC Connections for Example Network
PVC VLAN/Switch Connections VPI VCI Rate in kbps

1

Connects Switch 1 to Switch 2 on VLAN 5

0

32

45000

2

Connects Switch 2 to Switch 3 on VLAN 5

0

33

2080

3

Connects Switch 1 to Switch 3 on VLAN 5

0

34

45000

These assumptions apply for this example:

Before configuring the VLAN over PVCs, you must perform these tasks:

Set up the PVCs within the ATM cloud.

Note These procedures apply only if your ATM switch is a Cisco LightStream  1010 ATM switch. If you have a different ATM switch, consult the documentation provided by the switch vendor.

Step 1 Create PVC 1 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 2 Verify the setup of PVC 1. Enter this command on the LightStream  1010 ATM switch:

Step 3 Create PVC 2 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 4 Verify the setup of PVC 2. Enter this command on the LightStream  1010 ATM switch:

Step 5 Create PVC 3 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 6 Verify the setup of PVC 3. Enter this command on the LightStream  1010 ATM switch:

Set up PVC 1 and PVC 3 on the Catalyst  5000 series Switch 1.

Step 7 At the console of the Catalyst  5000 series Switch 1, establish a connection to the ATM module in slot 2 by entering these commands:

Step 8 Configure PVC 1 and PVC 3 on Switch 1 by entering these commands:

You can perform all PVC-related configurations for all VLANs on atm0, the major interface, because the subinterface number has no significance for PVC-supported VLANs. VCDs 10 and 11 (used above) can be any unused VCDs. Enter the show atm vc command to find unused VCDs.

Step 9 Bind PVC 1 and PVC 3 to VLAN 5 on Switch 1 by entering these commands:

Enter the VCD numbers used in Step 8. The last option in the atm bind pvc command specifies VLAN 5.

Step 10 Verify the setup on Switch 1 by entering these commands:

Step 11 Save the configuration as follows:

Set up PVC 1 and PVC 2 on the Catalyst  5000 series Switch 2.

Step 12 At the console of the Catalyst  5000 series Switch 2, establish a connection to the ATM module in slot 2 by entering these commands:

Step 13 Configure PVC 1 and PVC 2 on Switch 2 by entering these commands:

You can perform all PVC-related configurations for all VLANs on atm0, the major interface, because the subinterface number has no significance for PVC-supported VLANs. VCDs 10 and 11 (used above) can be any unused VCDs. Enter the show atm vc command to find unused VCDs.

Step 14 Bind PVC 1 and PVC 2 to VLAN 5 on Switch 2 by entering these commands:

Enter the VCDs used in Step 13. The last option in the atm bind pvc command specifies VLAN  5.

Step 15 Verify the setup on Switch 2 by entering these commands:

Step 16 Save the configuration as follows:

Set up PVC 2 and PVC 3 on the Catalyst 5000 series Switch 3.

Step 17 At the console of the Catalyst  5000 series Switch 3, establish a connection to the ATM module in slot 2 by entering these commands:

Step 18 Configure PVC 2 and PVC 3 on Switch 3 by entering these commands:

You can perform all PVC-related configurations for all VLANs on atm0, the major interface, because the subinterface number has no significance for PVC-supported VLANs. VCDs 10 and 11 (used above) can be any unused VCDs. Enter the show atm vc command to find unused VCDs.

Step 19 Bind PVC 2 and PVC 3 to VLAN 5 on Switch 3 by entering these commands:

Enter the VCDs used in Step 18. The last option in the atm bind pvc command specifies VLAN  5.

Step 20 Verify the setup on Switch 3 by entering these commands:

Step 21 Save the configuration as follows:

Redundant Configuration Traffic-Shaping Example

Figure 9-3 shows the PVCs needed for complete redundancy if PHY  A or PHY  B on either Switch  1 or Switch 2 fails. This example (referred to as example 2) applies to the dual PHY DS3 module, but you can use the same configuration for dual PHY OC-3 modules (with appropriate PCRs).


Figure 9-3: Redundant PVC Traffic-Shaping


In Figure 9-3, you see Catalyst  5000 series Switch 1 and Catalyst  5000 series Switch 2, each with an ATM dual PHY  DS3  module, connected to a LightStream 1010 ATM switch in the ATM cloud.

Assume PHY  A on Switch 1 goes down and transmits no data to PHY  A on Switch 2 over PVC  1, even though PHY  A on Switch 2 remains active. When PHY  A on Switch 1 goes down, PHY  B on Switch 1 becomes active and transmits data to PHY  B on Switch 2 over PVC  2.

Similarly, if PHY  A on Switch 2 goes down and transmits no data to Switch 1 over PVC  1, PHY  B on Switch 2 becomes active and transmits data to PHY  B on Switch 1 over PVC  3.

Table 9-4 shows the PVCs used to transmit data when the specified PHYs for the Catalyst  5000 series switches in Figure 9-3 are active. For example, if PHY  A on Switch 1 and PHY  A on Switch  2 are both active, data is transmitted on PVC 1.


Table 9-4: Redundancy Coverage for Figure 9-3
Switch 1 Switch 2 PVC Used

PHY  A--- active

PHY  A--- active

1

PHY  A--- active

PHY  B--- active

2

PHY  B--- active

PHY  A--- active

3

PHY  B--- active

PHY  B--- active

4

Note To ensure redundancy for data transmission using dual PHYs, you must set up PVCs  1,  2,  3, and  4 on the same VLAN and configure the same data rate for each PVC.

The following assumptions apply for example 2:


Table 9-5: PVC Connections in Figure 9-2
PVC Switch Connections VPI VCI kbps Rate

1

Connects PHY  A on Switch 1 to PHY  A on Switch 2

0

32

45000

2

Connects PHY  A on Switch 1 to PHY  B on Switch 2

0

33

45000

3

Connects PHY  B on Switch 1 to PHY  A on Switch 2

0

34

45000

4

Connects PHY  B on Switch 1 to PHY  B on Switch 2

0

35

45000

Before configuring the VLAN over PVCs, you must perform these tasks:

To configure example 2 in this section, follow these steps:

Note These procedures apply only if your ATM switch is a Cisco LightStream 1010 ATM switch. If you have a different ATM switch, consult the publication that accompanied the switch.

Set up the PVCs within the ATM cloud.

Step 1 Create PVC  1 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 2 Verify the setup of PVC  1. Enter this command on the LightStream  1010 ATM switch:

Step 3 Create PVC  2 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 4 Verify the setup of PVC  2. Enter this command on the LightStream  1010 ATM switch:

Step 5 Create PVC  3 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 6 Verify the setup of PVC  3. Enter this command on the LightStream  1010 ATM switch:

Step 7 Create PVC  4 within the ATM cloud. Enter these commands on the LightStream  1010 ATM switch:

Step 8 Verify the setup of PVC  4. Enter this command on the LightStream  1010 ATM switch:

Set up the PVCs on the Catalyst  5000 series Switch 1.

Step 9 At the console of the Catalyst  5000 series Switch 1, session to the ATM module in slot 2 by entering these commands:

Step 10 Configure PVCs 1, 2, 3, and 4 on Switch 1 by entering these commands:

You can perform all PVC-related configurations for all VLANs on atm0, the major interface, because the subinterface number has no significance for PVC-supported VLANs. VCDs 10 and 11 (used above) can be any unused VCDs. Enter the show atm vc command to find unused VCDs.

Step 11 Bind the PVCs to VLAN 5 on the Switch 1 by entering these commands:

Enter the VCD numbers used in Step 8. The last option in the atm bind pvc command specifies VLAN 5.

Step 12 Verify the setup on the Switch 1 by entering these commands:

Step 13 Save the configuration as follows:

Set up the PVCs on the Catalyst  5000 series Switch 2.

Step 14 At the console of the Catalyst  5000 series Switch 2, session to the ATM module in slot 2 by entering these commands:

Step 15 Configure PVCs 1, 2, 3, and 4 on Switch 2 by entering these commands:

You can perform all PVC-related configurations for all VLANs on atm0, the major interface, because the subinterface number has no significance for PVC-supported VLANs. VCDs 10 and 11 (used above) can be any unused VCDs. Enter the show atm vc command to find unused VCDs.

Step 16 Bind the PVCs to VLAN 5 on the Catalyst  5000 series Switch 2 by entering these commands:

Step 17 Verify the setup on the Catalyst  5000 series Switch 2 by entering these commands:

Step 18 Save the configuration as follows:


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