R3303-HP HSR6800 Routers MPLS Configuration Guide

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• The two PEs use different PW signaling protocols.
In such cases, you can establish multiple continuous PW segments that function as a single PW, called a
"multi-hop PW," a virtual connection between the two PEs.
Figure 58 Diagram for multi-hop PW
As shown in Figure 58, PE 1 and PE 2 are in different ASs. To set up a multi-hop PW between PE 1 and
PE 2, perform the following tasks:
• Establish three PWs: PW 1 between PE 1 and ASBR 1, PW 2 between ASBR 1 and ASBR 2, and
PW 3 between ASBR 2 between PE 2.
• Associate PW 1 and PW 2 on ASBR 1. Then, when receiving a packet from PW 1 (or PW 2), ASBR
1 removes the existing inner and outer labels of the packet and adds the inner and outer labels of
PW 2 (or PW 1) to the packet.
• Associate PW 2 and PW 3 on ASBR 2. Then, upon receiving a packet from PW 2 (or PW 3), ASBR
2 removes the existing inner and outer labels of the packet and then adds the inner and outer labels
of PW 3 (or PW 2) to the packet.
Thus, PW 1, PW 2, and PW 3 are put end to end and a multi-hop PW is formed across the ASs.
NOTE:
Only LDP VPLS connections can form a multi-hop PW.
VPLS configuration task list
Task Remarks
Enabling L2VPN and MPLS L2VPN Required.
Configuring static VPLS
Configure one type of VPLS as needed. Configuring LDP VPLS
Configuring BGP VPLS
Binding a VPLS instance Required.
Configuring MAC address learning Optional.