R3303-HP HSR6800 Routers MPLS Configuration Guide

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routing loop, you can configure a routing policy on PE2 to add the SoO attribute to route updates
received from CE 2 and CE 3 so that PE 2 does not advertise route updates from CE 3 to CE 2.
MPLS L3VPN FRR
MPLS L3VPN Fast Reroute (FRR) is applicable to a dual-homed scenario, as shown in Figure 83.
MPLS L3VPN FRR supports the two backup modes, backup between two VPNv4 routes and backup
between one IPv4 route and one VPNv4 route.
Backup between two VPNv4 routes
Figure 83 Backup between two VPNv4 routes
Configure FRR on PE 1 and specify the backup next hop to reach CE 2 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 route, and the
route from PE 3 as the backup route.
Backup between one IPv4 route and one VPNv4 route
Figure 84 Backup between one IPv4 route and one VPNv4 route
As shown in Figure 84, configure FRR on the egress node PE 2 and specify the backup next hop to reach
CE 2 as PE 3. When PE 2 receives an IPv4 route from CE 2 and a VPNv4 route from PE 3 (both routes
are destined to VPN 1 connected to CE 2), PE 2 uses the IPv4 route as the primary route, and the VPNv4
route as the backup route.