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This feature module explains how to configure L2VPN Pseudowire Switching, which extends Layer 2 Virtual Private Network (L2VPN) pseudowires across an interautonomous system (inter-AS) boundary or across two separate Multiprotocol Label Switching (MPLS) networks. The feature supports ATM and time-division multiplexing (TDM) attachment circuits (ACs) and Ethernet ACs.
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 www.cisco.com/go/cfn. An account on Cisco.com is not required.
For the Cisco 12000 series routers, the L2VPN Pseudowire Switching feature for Any Transport over MPLS (AToM) is supported on the following engines:
For engines that do not support this feature, the packets are sent to the software and forwarded through the slow path.
Note |
Engines E1 and E4 do not support L2VPN Pseudowire Switching, even in the slow path. |
L2VPN Pseudowire Switching allows the user to extend L2VPN pseudowires across two separate MPLS networks or across an inter-AS boundary, as shown in the two figures below.
L2VPN Pseudowire Switching connects two or more contiguous pseudowire segments to form an end-to-end multihop pseudowire. This end-to-end pseudowire functions as a single point-to-point pseudowire.
As shown in the second figure below, L2VPN Pseudowire Switching enables you to keep the IP addresses of the edge PE routers private across inter-AS boundaries. You can use the IP address of the Autonomous System Boundary Routers (ASBRs) and treat them as pseudowire aggregation (PE-agg) routers. The ASBRs join the pseudowires of the two domains.
L2VPN Pseudowire Switching also enables you to keep different administrative or provisioning domains to manage the end-to-end service. At the boundaries of these networks, PE-agg routers delineate the management responsibilities.
Figure 1 | L2VPN Pseudowire Switching in an Intra-AS Topology |
Figure 2 | L2VPN Pseudowire Switching in an Inter-AS Topology |
Switching AToM packets between two AToM pseudowires is the same as switching any MPLS packet. The MPLS switching data path switches AToM packets between two AToM pseudowires. The following list explains exceptions:
Use the following procedure to configure L2VPN Pseudowire Switching on each of the PE-agg routers. In this configuration, you are limited to two neighborcommands after entering the l2 vficommand.
The following example displays output from the show mpls l2transport vc command:
Router# show mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ----- ----
MPLS PW 10.0.1.1:100 10.0.1.1 100 UP
MPLS PW 10.0.1.1:100 10.0.1.1 100 UP
The following example displays output from the show vficommand:
Router# show vfi
VFI name: test, type: point-to-point
Neighbors connected via pseudowires:
Router ID Pseudowire ID
10.0.1.1 100
10.0.1.1 100
Two separate autonomous systems are able to pass L2VPN packets, because the two PE-agg routers have been configured with L2VPN Pseudowire Switching. This example configuration is shown in the figure below.
Figure 3 | L2VPN Pseudowire Switching in an Interautonomous System |
PE-agg-1 |
PE-agg-2 |
---|---|
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [pe-agg1] ! boot-start-marker boot-end-marker ! enable secret 5 $1$Q0Bb$32sIU82pHRgyddWaeB4zs/ ! ip subnet-zero ip cef no ip domain-lookup mpls label protocol ldp pseudowire-class SW-PW encapsulation mpls ! l2 vfi PW-SWITCH-1 point-to-point neighbor 172.17.255.3 100 pw-class SW-PW neighbor 172.16.255.1 16 pw-class SW-PW ! interface Loopback0 ip address 172.16.255.3 255.255.255.255 no ip directed-broadcast ! interface Serial0/0 ip address 172.16.0.6 255.255.255.252 no ip directed-broadcast mpls ip ! interface Serial1/0 ip address 192.168.0.1 255.255.255.252 no ip directed-broadcast mpls bgp forwarding ! router ospf 16 log-adjacency-changes network 172.16.0.0 0.0.255.255 area 0 ! router bgp 65016 no synchronization bgp log-neighbor-changes network 172.16.255.3 mask 255.255.255.255 neighbor 192.168.0.2 remote-as 65017 neighbor 192.168.0.2 send-label no auto-summary ! ip classless control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [pe-agg2] ! boot-start-marker boot-end-marker ! enable secret 5 $1$32jd$zQRfxXzjstr4llV9DcWf7/ ! ip subnet-zero ip cef no ip domain-lookup mpls label protocol ldp pseudowire-class SW-PW encapsulation mpls ! l2 vfi PW-SWITCH-1 point-to-point neighbor 172.16.255.3 100 pw-class SW-PW neighbor 172.17.255.1 17 pw-class SW-PW ! interface Loopback0 ip address 172.17.255.3 255.255.255.255 no ip directed-broadcast ! interface Serial0/0 ip address 172.17.0.6 255.255.255.252 no ip directed-broadcast mpls ip ! interface Serial1/0 ip address 192.168.0.2 255.255.255.252 no ip directed-broadcast mpls bgp forwarding ! router ospf 17 log-adjacency-changes network 172.17.0.0 0.0.255.255 area 0 ! router bgp 65017 no synchronization bgp log-neighbor-changes network 172.17.255.3 mask 255.255.255.255 neighbor 192.168.0.1 remote-as 65016 neighbor 192.168.0.1 send-label no auto-summary ! ip classless control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
A-P1 |
B-P1 |
---|---|
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [a-p1] ! boot-start-marker boot-end-marker ! enable secret 5 $1$eiUn$rTMnZiYnJxtMTpO0NKpQQ/ ! ip subnet-zero ip cef no ip domain-lookup mpls label protocol ldp ! interface Loopback0 ip address 172.16.255.2 255.255.255.255 no ip directed-broadcast ! interface Serial0/0 ip address 172.16.0.5 255.255.255.252 no ip directed-broadcast mpls ip ! interface Serial1/0 ip address 172.16.0.2 255.255.255.252 no ip directed-broadcast mpls ip ! router ospf 16 log-adjacency-changes network 172.16.0.0 0.0.255.255 area 0 ! ip classless ! control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [b-p1] ! boot-start-marker boot-end-marker ! enable secret 5 $1$svU/$2JmJZ/5gxlW4nVXVniIJe1 ! ip subnet-zero ip cef no ip domain-lookup mpls label protocol ldp ! interface Loopback0 ip address 172.17.255.2 255.255.255.255 no ip directed-broadcast ! interface Serial0/0 ip address 172.17.0.5 255.255.255.252 no ip directed-broadcast mpls ip ! interface Serial1/0 ip address 172.17.0.2 255.255.255.252 no ip directed-broadcast mpls ip ! router ospf 17 log-adjacency-changes network 172.17.0.0 0.0.255.255 area 0 ! ip classless ! control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
PE1 |
PE2 |
---|---|
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [pe1] ! boot-start-marker boot-end-marker ! enable secret 5 $1$9z8F$2A1/YLc6NB6d.WLQXF0Bz1 ! ip subnet-zero ip cef no ip domain-lookup mpls label protocol ldp pseudowire-class ETH-PW encapsulation mpls ! interface Loopback0 ip address 172.16.255.1 255.255.255.255 no ip directed-broadcast ! interface Ethernet0/0 no ip address no ip directed-broadcast no cdp enable xconnect 172.16.255.3 16 pw-class ETH-PW ! interface Serial1/0 ip address 172.16.0.1 255.255.255.252 no ip directed-broadcast mpls ip ! router ospf 16 log-adjacency-changes network 172.16.0.0 0.0.255.255 area 0 ! ip classless ! control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [pe2] ! boot-start-marker boot-end-marker ! enable secret 5 $1$rT.V$8Z6Dy/r8/eaRdx2TR/O5r/ ! ip subnet-zero ip cef no ip domain-lookup mpls label protocol ldp pseudowire-class ETH-PW encapsulation mpls ! interface Loopback0 ip address 172.17.255.1 255.255.255.255 no ip directed-broadcast ! interface Ethernet0/0 no ip address no ip directed-broadcast no cdp enable xconnect 172.17.255.3 17 pw-class ETH-PW ! interface Serial1/0 ip address 172.17.0.1 255.255.255.252 no ip directed-broadcast mpls ip ! router ospf 17 log-adjacency-changes network 172.17.0.0 0.0.255.255 area 0 ! ip classless ! control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
CE1 |
CE2 |
---|---|
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [ce1] ! boot-start-marker boot-end-marker ! enable secret 5 $1$o9N6$LSrxHufTn0vjCY0nW8hQX. ! ip subnet-zero ip cef no ip domain-lookup ! interface Ethernet0/0 ip address 10.0.0.1 255.255.255.252 no ip directed-broadcast ! ip classless ! control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
version 12.0 service timestamps debug uptime service timestamps log uptime service password-encryption ! hostname [ce2] ! boot-start-marker boot-end-marker ! enable secret 5 $1$YHo6$LQ4z5PdrF5B9dnL75Xvvm1 ! ip subnet-zero ip cef no ip domain-lookup ! interface Ethernet0/0 ip address 10.0.0.2 255.255.255.252 no ip directed-broadcast ! ip classless ! control-plane ! line con 0 exec-timeout 0 0 line aux 0 line vty 0 4 login ! no cns aaa enable end |
Related Topic |
Document Title |
---|---|
Any Transport over MPLS |
|
Pseudowire redundancy |
http://www.cisco.com/univercd/cc/td/doc/product/software/ios120/120newft/120limit/120s/120s31/fsstitch.htm L2VPN Pseudowire Redundancy |
High availability for AToM |
|
L2VPN interworking |
|
Layer 2 local switching |
|
PWE3 MIB |
Pseudowire Emulation Edge-to-Edge MIBs for Ethernet and Frame Relay Services |
Packet sequencing |
Standard |
Title |
---|---|
draft-ietf-pwe3-control-protocol-14.txt |
Pseudowire Setup and Maintenance using LDP |
draft-martini-pwe3-pw-switching-01.txt |
Pseudo Wire Switching |
MIB |
MIBs Link |
---|---|
|
To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL: |
RFCs |
Title |
---|---|
None |
-- |
Description |
Link |
---|---|
The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies. To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds. Access to most tools on the Cisco Support website requires a Cisco.com user ID and password. |
The following table provides release information about the feature or features described in this module. This table 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.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Table 1 | Feature Information for L2VPN Pseudowire Switching |
Feature Name |
Releases |
Feature Information |
---|---|---|
L2VPN Pseudowire Switching |
12.0(31)S, 12.2(28)SB, 12.2(33)SRB, 12.2(33)SRD2, 12.2(33)SRE |
This feature configures L2VPN Pseudowire Switching, which extends L2VPN pseudowires across an interautonomous system (inter-AS) boundary or across two separate MPLS networks. In Cisco IOS Release 12.2(28)SB, support was added for the Cisco 7200 and 7301 series routers. In 12.2(33)SRD2, support was added for ATM and TDM ACs. The following commands were introduced or modified: l2 vfi point-to-point, neighbor(L2VPN Pseudowire Switching), show vfi. |
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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.