H3C Technologies H3C S6800 Series Switches - Manual (Page 194)

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PE 2 switches traffic to the link PE 2—PE 3—CE 2, and traffic from CE 1 to CE 2 goes through the path
CE 1—PE 1—PE 2—PE 3—CE 2. This avoids traffic interruption before route convergence completes
(switching to the link CE 1—PE 1—PE 3—CE 2).
In this scenario, PE 2 is responsible for primary link detection and traffic switchover.
IPv4 route backup for a VPNv4 route
Figure 61 Network diagram
As shown in Figure 61 , configure FRR on the egress node PE 2, and specify the backup next hop for VPN
1 as CE 2. 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 VPNv4 route as the primary link, and the IPv4 route
as the backup link.
Configure BFD for LSPs or MPLS TE tunnels on PE 2 to detect the connectivity of the public tunnel from PE
2 to PE 3. When the tunnel operates correctly, traffic from CE 1 to CE 2 goes through the path CE 1—
PE 1—PE 2—PE 3—CE 2. When the tunnel fails, the traffic goes through the path CE 1—PE 1—PE 2
—
CE 2.
In this scenario, PE 2 is responsible for primary link detection and traffic switchover.
Protocols and standards
• RFC 3107, Carrying Label Information in BGP-4
• RFC 4360, BGP Extended Communities Attribute
• RFC 4364, BGP/MPLS IP Virtual Private Networks (VPNs)
• RFC 4577, OSPF as the Provider/Customer Edge Protocol for BGP/MPLS IP Virtual Private
Networks (VPNs)
MPLS L3VPN configuration task list
Tasks at a glance
(Required.) Configuring basic MPLS L3VPN
(Optional.) Configuring inter-AS VPN
(Optional.) Configuring nested VPN
文件中找不到关系 ID 为 rId83 的图像部件。