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N:1 PVC Mapping to PWE with Non Unique VPIs

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N:1 PVC Mapping to PWE with Non Unique VPIs

Table Of Contents

N:1 PVC Mapping to PWE with Non Unique VPIs

Finding Feature Information

Contents

Restrictions for N:1 PVC Mapping to PWE with Non Unique VPIs

Information About N:1 PVC Mapping to PWE with Non Unique VPIs

N:1 PVC Mapping to PWE with Non Unique VPIs Feature Description

How to Configure N:1 PVC Mapping to PWE with Non Unique VPIs

Configuring N:1 PVC Mapping to PWE with Non Unique VPIs

Configuration Examples for N:1 PVC Mapping to PWE with Non Unique VPIs

Example: Configuring N:1 PVC Mapping to PWE with Non Unique VPIs

Additional References

Related Documents

Technical Assistance

Feature Information for N:1 PVC Mapping to PWE with Non Unique VPIs


N:1 PVC Mapping to PWE with Non Unique VPIs


First Published: November 1, 2011
Last Updated: November 18, 2011

The N:1 PVC Mapping to PWE with Non Unique VPIs feature maps one or more ATM permanent virtual circuits (PVCs) to a single pseudowire. Benefits of this feature include the following:

Aggregate quality of service (QoS) can be applied to related PVCs.

Bandwidth is conserved with the reduction in the number of pseudowires that are used.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

Restrictions for N:1 PVC Mapping to PWE with Non Unique VPIs

Information About N:1 PVC Mapping to PWE with Non Unique VPIs

How to Configure N:1 PVC Mapping to PWE with Non Unique VPIs

Configuration Examples for N:1 PVC Mapping to PWE with Non Unique VPIs

Additional References

Feature Information for N:1 PVC Mapping to PWE with Non Unique VPIs

Restrictions for N:1 PVC Mapping to PWE with Non Unique VPIs

N:1 PVC mapping configuration is supported only on multipoint subinterfaces; it is not supported on main interfaces or point-to-point subinterfaces.

N:1 PVC mapping mode is not supported on Access Circuit Redundancy subinterfaces.

Preconfigured PVCs cannot exist on the multipoint subinterface on which you want to configure N:1 PVC mapping.

An attachment circuit that has been bound to a pseudowire cannot be removed unless all Layer 2 VCs have been removed.

Layer 3 PVCs cannot be configured on N:1 subinterfaces.

Cell packing values configured under a virtual circuit (VC) class attached to the PVC, main interface, or subinterface will not be inherited by N:1 PVCs.

Operation, Administration, and Maintenance (OAM) functionality is not supported on N:1 Layer 2 PVCs. OAM cells coming from the customer edge network will be treated as normal data traffic and traverse the pseudowire.

Only ATM adaptation layer type 0 (AAL-0) encapsulation is supported for N:1 PVCs.

Service policy configuration can be configured only at the subinterface level for N:1 PVCs.

Information About N:1 PVC Mapping to PWE with Non Unique VPIs

N:1 PVC Mapping to PWE with Non Unique VPIs Feature Description

N:1 PVC Mapping to PWE with Non Unique VPIs Feature Description

To transport ATM cells over Multiprotocol Label Switching (MPLS), a virtual circuit is established between the provider edge (PE) routers on both ends of the MPLS backbone. With the N:1 PVC Mapping to PWE with Non Unique VPIs feature, multiple PVCs irrespective of their VPIs, are transported over a single pseudowire configured on a subinterface. ("N:1" refers to the number of PVCs transported over one pseudowire). ATM cells are packed together on a single frame and sent over the single pseudowire. The ATM cell header information is packed together with the cell payload on a per-cell basis in the packets so that packets received at the egress end are unpacked and the ATM cells are mapped to the respective PVCs.

In N:1 PVC mapping mode, the router can pack cells only from a single PVC in an MPLS packet to transmit over a pseudowire; cells from multiple PVCs cannot be packed in a single MPLS packet and mapped to a single pseudowire for transmission. However, if an MPLS packet packed with cells from multiple PVCs is received, then those cells will be unpacked and sent to the respective PVCs.

How to Configure N:1 PVC Mapping to PWE with Non Unique VPIs

Configuring N:1 PVC Mapping to PWE with Non Unique VPIs

Configuring N:1 PVC Mapping to PWE with Non Unique VPIs

SUMMARY STEPS

1. enable

2. configure terminal

3. interface atm slot/subslot/port.subinterface

4. atm mcpt-timers timer-1 timer-2 timer-3

5. exit

6. interface atm slot/subslot/port.subinterface multipoint

7. no ip address

8. atm enable-ilmi-trap

9. cell-packing cells mcpt-timer timer-number

10. xconnect peer-address vc-id encapsulation mpls

11. pvc vpi/vci l2transport

12. Repeat Step 11 for the number of PVCs you want to configure.

13. end

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

interface atm slot/subslot/port

Example:

Router# interface atm 9/1/1

Enables the ATM interface and enters interface configuration mode.

Enter the interface number, slot number, and port number.

Step 4 

atm mcpt-timers timer1 timer2 timer3

Example:

Router(config-if)# atm mcpt-timers 100 200 300

Sets the Maximum Cell Packing Timeout (MCPT) values in microseconds.

The range for the timer1 and timer2 arguments is 10 to 4095. The range for the timer3 argument is 20 to 4095.

MCPT timer sets the time that the router waits for the raw cells (AAL-0 encapsulation) to be packed into a single packet for punting into the pseudowire.

Step 5 

exit

Example:

Router(config-if)# exit

Exits interface configuration mode.

Step 6 

interface atm slot/subslot/port.subslot multipoint

Example:

Router(config)# interface atm 9/1/1.1 multipoint

Enters subinterface configuration mode and creates the specified multipoint subinterface on the given port on the specified ATM SPA.

Step 7 

no ip address

Example:

Router(config-subif)# no ip address

Removes the interface IP address.

Step 8 

atm enable-ilmi-trap

Example:

Router(config-subif)# atm enable-ilmi-trap

Generates an Integrated Local Management Interface (ILMI) atmfVccChange trap when an ATM interface or subinterface is enabled or shut down.

Step 9 

cell-packing maxcells mcpt-timer timer-number

Example:

Router(config-subif)# cell-packing 20 mcpt-timer 2

Enables ATM over MPLS to pack multiple ATM cells into each MPLS packet within the MCPT timing.

Step 10 

xconnect peer-ipaddress vc-id encapsulation mpls

Example:

Router(config-subif)# xconnect 10.1.1.1 100 encapsulation mpls

Enables the attachment circuit and specifies the IP address of the peer, a VC ID, and the data encapsulation method.

The range of the VC ID is from 1 to 4294967295.

Step 11 

pvc vpi/vci l2transport

Example:

Router(config-subif)# pvc 10/100 l2transport

Assigns a VPI and VCI.

vpi—Specifies the ATM network virtual path identifier (VPI) of the VC to multiplex on the permanent virtual path. The range is from 0 to 255.

vci—Specifies the virtual circuit identifier (VCI).

The l2transport keyword indicates that the PVC is a switched PVC instead of a terminated PVC.

Step 12 

Repeat Step 11 for the number of PVCs you want to configure.

Step 13 

end

Example:

Router(config-subif)# end

Exits subinterface configuration mode and returns to privileged EXEC mode.

Configuration Examples for N:1 PVC Mapping to PWE with Non Unique VPIs

Example: Configuring N:1 PVC Mapping to PWE with Non Unique VPIs

Example: Configuring N:1 PVC Mapping to PWE with Non Unique VPIs

The following example shows how to configure the N:1 ATM PVC mapping to pseudowires with non unique VPIs:

Router> enable
Router# configure terminal
Router(config)# interface atm 9/1/1
Router(config-if)# atm mcpt-timers 20 30 40
Router(config-if)# exit
Router(config)# interface atm 9/1/1.1 multipoint
Router(config-subif)# no ip address
Router(config-subif)# atm enable-ilmi-trap
Router(config-subif)# cell packing 20 mcpt-timer 2
Router(config-subif)# xconnect 10.1.1.1 100 encapsulation mpls
Router(config-subif)# pvc 10/100 l2transport
Router(config-subif)# pvc 11/122 l2transport
Router(config-subif)# pvc 19/231 l2transport
Router(config-subif)# exit
Router(config)# end
 
   

Additional References

Related Documents


Technical Assistance

Description
Link

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http://www.cisco.com/cisco/web/support/index.html


Feature Information for N:1 PVC Mapping to PWE with Non Unique VPIs

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.


Note Table 1 lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.


Table 1 Feature Information for N:1 PVC Mapping to PWE with Non Unique VPIs

Feature Name
Releases
Feature Information

N:1 PVC Mapping to PWE with Non Unique VPIs

15.2(1)S

The N:1 PVC Mapping to PWE with Non Unique VPIs feature maps one or more ATM PVCs to a single pseudowire.