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Bidirectional Forwarding Detection | 181
To establish a BFD session:
Verify that sessions have been created for static routes using the command
show bfd neighbors, as shown
in Figure 9-10. View detailed session information using the command
show bfd neighbors detail, as shown
in Figure 9-8.
Figure 9-10. Viewing Established Sessions for Static Routes
Changing static route session parameters
BFD sessions are configured with default intervals and a default role. The parameters that can be
configured are: Desired TX Interval, Required Min RX Interval, Detection Multiplier, and system role.
These parameters are configured for all static routes; if you change a parameter, the change affects all
sessions for static routes.
To change parameters for static route sessions:
View session parameters using the command
show bfd neighbors detail, as shown in Figure 9-8 on
page 179.
Disabling BFD for static routes
If BFD is disabled, all static route BFD sessions are torn down. A final Admin Down packet is sent to all
neighbors on the remote systems, and those neighbors change to the Down state (Message 3 on page 179).
Step Task Command Syntax Command Mode
1 Establish BFD sessions for all neighbors that are the next hop
of a static route.
ip route bfd
CONFIGURATION
Step Task Command Syntax Command Mode
1 Change parameters for all static route
sessions.
ip route bfd interval milliseconds min_rx
milliseconds multiplier value role
[active |
passive
]
CONFIGURATION
R1(conf)#ip route 2.2.3.0/24 2.2.2.2
R1(conf)#ip route bfd
R1(conf)#do show bfd neighbors
* - Active session role
Ad Dn - Admin Down
C - CLI
I - ISIS
O - OSPF
R - Static Route (RTM)
LocalAddr RemoteAddr Interface State Rx-int Tx-int Mult Clients
2.2.2.1 2.2.2.2 Gi 4/24 Up 100 100 4 R
BFD for Static Routes Enabled