314
Figure 85 Intra-domain multi-segment PW
Inter-domain multi-segment PW
An inter-domain multi-segment PW has concatenated PWs in different ASs, and is a method for
inter-AS option B networking.
As shown in Figure 86, to create an inter-domain multi-segment PW between PE 1 and PE 2 in
different ASs, you can perform the following operations:
• Concatenate PW 1 and PW 2 on ASBR 1
• Concatenate PW 2 and PW 3 on ASBR 2.
Figure 86 Inter-domain multi-segment PW
VCCV
Virtual Circuit Connectivity Verification (VCCV) is an OAM function for L2VPN. It verifies the
connectivity of PWs on the data plane. VCCV includes two modes:
• Manual mode—Use the ping mpls pw command to manually test the connectivity of a PW.
• Auto mode—Configure BFD to automatically test the connectivity of a PW.
For more information about VCCV, see "Configuring MPLS OAM."
CE
1
PE 4
PE
1 PE 2
CE
2
MPLS
or IP backbone
PE 3
Tunnel
Tunnel
PW
1
PW 2
PW
CE 1
PE 1
PE 2
ASBR 1
ASBR 2
CE
2
AS 100
AS 200
MPLS or IP backbone MPLS or IP backbone
PW
1
PW 3
PW 2
PW
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