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Configuring bidirectional control detection
1. Enter system view.
system-view
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Enable BFD bidirectional
control detection.
ospf bfd enable
By default, BFD bidirectional control
detection is disabled.
Both ends of a BFD session must be
on the same network segment and in
the same area.
Configuring single-hop echo detection
1. Enter 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 interface view.
interface
interface-type
interface-number
N/A
4. Enable BFD single-hop
echo detection.
ospf bfd enable echo
By default, BFD single-hop echo
detection is disabled.
Configuring OSPF FRR
A link or router failure on a path can cause packet loss and even routing loop until OSPF completes
routing convergence based on the new network topology. FRR enables fast rerouting to minimize the
impact of link or node failures.
Figure 23 Network diagram for OSPF FRR
As shown in Figure 23, configure FRR on Router B by using a routing policy to specify a backup next
hop. When the primary link fails, OSPF directs packets to the backup next hop. At the same time,
OSPF calculates the shortest path based on the new network topology. It forwards packets over the
path after network convergence.
You can configure OSPF FRR to calculate a backup next hop by using the loop free alternate (LFA)
algorithm, or specify a backup next hop by using a routing policy.
Router A Router B Router E
Backup nexthop: Router C
Nexthop: Router D
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