Table Of Contents
N:1 PVC Mapping to PWE with Non Unique VPIs
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
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, 2011Last Updated: November 18, 2011The 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
•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
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
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.
Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)
Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.
© 2011 Cisco Systems, Inc. All rights reserved.