HP HPE FlexNetwork MSR Router Series Configuration Manual page 421

Figure 105 Multi-segment PW
CE 1
Multi-segment PWs include intra-domain multi-segment PWs and inter-domain multi-segment PWs.
Intra-domain multi-segment PW
An intra-domain multi-segment PW has concatenated PWs within an AS. You can create an
intra-domain multi-segment PW between two PEs that have no public tunnel to each other.
As shown in
between PE 1 and PE 2 and a public tunnel between PE 2 and PE 4. To create an intra-domain
multi-segment PW between PE 1 and PE 4, you can perform the following operations:
1. Create a PW between PE 1 and PE 2 (PW 1) and a PW between PE 2 and PE 4 (PW 2).
2. Concatenate the two PWs on PE 2.
Intra-domain multi-segment PWs can fully use existing public tunnels to reduce end-to-end public
tunnels.
Figure 106 Intra-domain multi-segment PW
CE 1
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
different ASs, you can perform the following operations:
•
Concatenate PW 1 and PW 2 on ASBR 1.
MPLS or IP backbone
PE 2
PW 2
PE 1
Figure 106, there is no public tunnel between PE 1 and PE 4. There is a public tunnel
MPLS or IP backbone
PE 1
Tunnel
PE 3
Figure 107, to create an inter-domain multi-segment PW between PE 1 and PE 2 in
PE 3
PW
PW 1
PE 2
PW
PE 4
411
PE 4
CE 2
PW 2
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