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Configuring bidirectional control detection
1. Enter system view.
system-view
N/A
2. Enter RIP view.
rip
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Specify a RIP neighbor.
peer
ip-address
By default, RIP does not unicast
updates to any peer.
Because the
undo peer
command does not remove the
neighbor relationship
immediately, executing the
command cannot bring down the
BFD session immediately.
4. Enter interface view.
interface
interface-type
interface-number
N/A
5. Enable BFD on the RIP
interface.
rip bfd enable
By default, BFD is disabled on a
RIP interface.
Configuring RIP FRR
A link or router failure on a path can cause packet loss and even routing loop until RIP completes
routing convergence based on the new network topology. FRR enables fast rerouting to minimize the
impact of link or node failures.
Figure 6 Network diagram for RIP FRR
As shown in 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.
Configuration restrictions and guidelines
RIP FRR takes effect only for RIP routes learned from directly connected neighbors.
RIP FRR is available only when the state of primary link (with Layer 3 interfaces staying up)
changes from bidirectional to unidirectional or down.
Equal-cost routes do not support RIP FRR.
Router A Router B
Router E
Backup nexthop
:
Router C
Nexthop
: Router D
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