H3C Technologies H3C S12500-X Series Switches - Manual (Page 52)

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In
927H
Figure 6 , configure FRR on Router B by using a routing policy to specify a backup next hop. When the
primary link fails, RIP directs packets to the backup next hop. At the same time, RIP calculates the shortest
path based on the new network topology, and forwards packets over that path after network
convergence.
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Configuration restrictions and guidelines
• RIP FRR takes effect only for RIP routes learned from directly connected neighbors.
• Do not use RIP FRR and BFD for RIP at the same time. Otherwise, FRR might fail to work.
• RIP FRR is available only when the state of primary link (with Layer 3 interfaces staying up) changes
from bidirectional to unidirectional or down.
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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 for FRR. For more information about routing policy configuration,
see "
928H
Configuring routing policies ."
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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
By default, the source address of
echo packets is not configured.
3. Enter RIP view.
rip [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
4. Configure RIP FRR.
fast-reroute route-policy
route-policy-name
By default, RIP FRR is disabled.
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Displaying and maintaining RIP
Execute display commands in any view and execute reset commands in user view.
Task Command
Display RIP current status and configuration
information.
display rip [ process-id ]
Display active routes in RIP database.
display rip process-id database [ ip-address
{ mask-length | mask } ]
Display RIP interface information.
display rip process-id interface [ interface-type
interface-number ]
Display routing information about a specified RIP
process. display rip process-id route [ ip-address { mask-length
| mask } [ verbose ] | peer ip-address | statistics ]
Reset a RIP process. reset rip process-id process
Clear the statistics of a RIP process. reset rip process-id statistics