HP 6127xlg Configuration Manual page 189

IPv4 route backup for a VPNv4 route.
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VPNv4 route backup for a VPNv4 route
Figure 59 Network diagram
As show in Figure
1 as PE 3. When PE 1 receives a VPNv4 route to CE 2 from both PE 2 and PE 3, it uses the route from
PE 2 as the primary link, and the route from PE 3 as the backup link.
Configure BFD for LSPs or MPLS TE tunnels on PE 1 to detect the connectivity of the public tunnel from PE
1 to PE 2. When the tunnel PE 1—PE 2 operates correctly, traffic from CE 1 to CE 2 goes through the path
CE 1—PE 1—PE 2—CE 2. When the tunnel fails, the traffic goes through the path CE 1—PE 1—PE 3
—CE 2.
In this scenario, PE 1 is responsible for primary link detection and traffic switchover.
For more information about BFD for LSPs or MPLS TE tunnels, see
VPNv4 route backup for an IPv4 route
Figure 60 Network diagram
As shown in
1 as PE 3. When PE 2 receives an IPv4 route from CE 2 and a VPNv4 route from PE 3 (both routes are
destined for VPN 1 connected to CE 2), PE 2 uses the IPv4 route as the primary link, and the VPNv4 route
as the backup link.
PE 2 uses echo-mode BFD to detect the connectivity of the link from PE 2 to CE 2. When the link operates
correctly, traffic from CE 1 to CE 2 goes through the path CE 1—PE 1—PE 2—CE 2. When the link fails,
59, configure FRR on the ingress node PE 1, and specify the backup next hop for VPN
Figure 60, configure FRR on the egress node PE 2, and specify the backup next hop for VPN
"Configuring MPLS
180
OAM."