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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.
For Cisco ASR 900 RSP3 module, on pseudowire stitching point regular hardware programming is be seen because in this case pseudowire has to swap the label.
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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