HP MSR2000 Configuration Manual page 194

VPNv4 route backup for a VPNv4 route
Figure 59 Network diagram
As show in Figure
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 LSP tunnel between
PE 1 and PE 2. When the link 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 link 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 "Configuring MPLS OAM."
VPNv4 route backup for an IPv4 route
Figure 60 Network diagram
As shown in
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.
Configure ARP or echo-mode BFD on PE 2 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, PE 2 switches fast to the link PE 2—PE 3—CE 2, and traffic from CE 1 to CE 2 goes
59, configure FRR on the ingress node PE 1, and specify the backup next hop as PE 3.
Figure 60, configure FRR on the egress node PE 2, and specify the backup next hop as PE
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