H3C Technologies H3C S6800 Series Switches - Manual (Page 193)

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• IPv4 route backup for a VPNv4 route.
VPNv4 route backup for a VPNv4 route
Figure 59 Network diagram
As show in Figure 59 , configure FRR on the ingress node PE 1, and specify the backup next hop for VPN
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 "
Configuring MPLS OAM ."
VPNv4 route backup for an IPv4 route
Figure 60 Network diagram
As shown in Figure 60 , configure FRR on the egress node PE 2, and specify the backup next hop for VPN
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,
文件中找不到关系 ID 为 rId81 的图像部件。
文件中找不到关系 ID 为 rId82 的图像部件。