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Pseudowire stitching is a technique where a pair of independent pseudowires are configured in such a way that they behave like a single point to point pseudowire. It is also called as multi-segment pseudowire (MS-PW).
Pseudowire stitching can be achieved using cross-connect.
Pseudowire stitching is useful in scenarios where a large network needs to be divided into small pieces, for example, core and metro side, each part of the network will be stitched to achieve end-to-end seamless connectivity.
Below is an example with three nodes connected:
Router IDs are:
R1 - 1.1.1.1
R2 - 2.2.2.2
R3 - 3.3.3.3
Configuration on R1 node:
interface GigabitEthernet0/1/0
no ip address
negotiation auto
service instance 1 ethernet
encapsulation dot1q 1
xconnect 2.2.2.2 100 encapsulation mpls
!Configuration on R2 node: (Stitching point)
l2vpn xconnect context PW
member 1.1.1.1 100 encapsulation mpls
member 3.3.3.3 100 encapsulation mpls
Configuration on R3 node:
interface GigabitEthernet0/1/0
no ip address
negotiation auto
service instance 1 ethernet
encapsulation dot1q 1
xconnect 2.2.2.2 100 encapsulation mpls
!R2#show mpls l2transport vc
Local intf Local circuit Dest address VC ID Status
------------- -------------------------- --------------- ---------- ----------
pw100010 3.3.3.3 100 1.1.1.1 100 UP
pw100009 1.1.1.1 100 3.3.3.3 100 UP
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