Prerequisites For Configuring L2Vpn Single Segment Pseudowires; Restrictions For Configuring L2Vpn Single Segment Pseudowires; Configuring L2Vpn Single Segment Pseudowire - Cisco ASR 9000 Series Configuration Manuallines

Implementing Point to Point Layer 2 Services
Figure 17: E-Line Services Network with SS-PWs

Prerequisites for Configuring L2VPN Single Segment Pseudowires

MPLS LDP, IGP, BGP, L2VPN, and interfaces must be configured on the two end points of the PW:
• Configuring MPLS Label Distribution Protocol.
• Configuring Interior Gateway Protocol (IGP).
• Configure Border Gateway Protocol (BGP).
• Configuring an Interface or Connection for L2VPN.

Restrictions for Configuring L2VPN Single Segment Pseudowires

• The routed pseudowire can only be enabled on Virtual Private Wire Service (VPWS) cross connects.
• A cross-connect cannot have both ends configured as "neighbor routed" pseudowire.
• SS-PW is not supported as the other member of the cross-connect, that is, at a T-PE, one end of the
• Source AII and AC-ID (attachment circuit identifier) are unique per router.
• L2TP and MPLS static are not supported.

Configuring L2VPN Single Segment Pseudowire

To configure single segment pseudowire in the network, do the following:
1. (Optional) Configuring the related L2VPN Global Parameters. See
This procedure is used to overwrite the default BGP Route Distinguisher (RD) auto-generated value and
also the Autonomous System Number (ASN) and Route Identifier (RID) of BGP.
2. Configuring L2VPN VPWS SS-PW
3. Configuring L2VPN MS-PW Address Family Under BGP
The address family is configured under BGP to exchange the dynamic pseudowire routes.
cross-connect can be the termination of the SS-PW and the other end can either be an attachment circuit
(AC) or a PW-HE.
L2VPN and Ethernet Services Configuration Guide for Cisco ASR 9000 Series Routers, IOS XR Release 6.3.x
Prerequisites for Configuring L2VPN Single Segment Pseudowires
Configuring L2VPN Global Parameters
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