H3C Technologies H3C SR8800 - Manual (Page 56)

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NOTE:
•
RIP FRR is only effective for non-recursive RIP routes (that are learned from directly connected
neighbors).
• Do not use RIP FRR and BFD (for RIP) at the same time; otherwise, RIP FRR may fail to take effect.
When a link in a RIP network fails, the traffic is interrupted until RIP completes routing convergence based
on the new network topology.
You can enable RIP fast reroute (FRR) to reduce traffic recovery time.
Figure 9 Network diagram for RIP FRR
In Figure 9 , after you enable FRR on Router B, RIP designates a backup next hop using a routing policy
when a network failure is detected. Packets are directed to the backup next hop to reduce traffic recovery
time. At the same time, RIP calculates the shortest path based on the new network topology, and forwards
packets over the path after network convergence.
Configuration prerequisites
You must specify a next hop by using the apply fast-reroute backup-interface command in a routing
policy and reference the routing policy with RIP FRR. For more information about routing policy
configuration, see the chapter “Configuring routing policies.”
Configuration procedure
To configure RIP FRR:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the source address
of echo packets.
bfd echo-source-ip ip-address Not configured by default
3. Enter RIP view.
rip [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
4. Enable RIP FRR and reference
a routing policy to designate
a backup next hop.
fast-reroute route-policy
route-policy-name
Disabled by default
Configuring BFD for RIP
NOTE:
For more information about BFD, see High Availability Configuration Guide.
BFD for RIP provides the following link detection modes: