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DES-7200 Configuration Guide Chapter 3 BFD Configuration
3-19
3.3.8 Configuring the BFD for
BGP
Being similar to OSPF, by configuring the BFD for BGP, BGP protocol rapidly
detects the faults, realizes the rapid detection of the neighbor relationship and
fastens the protocol convergence. By default, the BGP keepalive interval is 60s
and the holdtime is 180s. The minimum value of the keepalive interval and
holdtime are 1s and 3s respectively. It is slow to detect the neighbor relationship.
A large amount of the packets will be lost on the interface that receives and
sends the packets at the fast speed.
Use the neighbor ip-address fall-over bfd command to enable the BFD for
BGP.
Command Function
DES-7200>enable
Enter the privileged mode.
DES-7200# configure terminal
Enter the global configuration mode.
DES-7200(config)# router bgp
as-tag
Enter the Router configuration mode.
DES-7200(config-router)# neighbor
ip-address fall-over bfd
Configure the BFD for BGP to detect the fault
of the specific neighbor.
DES-7200(config-router)# end
(Optional) Exit to the privileged mode.
DES-7200# show bfd neighbor
[details]
(Optional) Show the information of the BFD
session establishment and whether BGP is
associated to the specified session.
DES-7200# show ip bgp neighbors
(Optional) Verify whether BGP is associated
to the specified session.
Use the no neighbor ip-address fall-over bfd command in the Router
configuration mode to disable the BFD for BGP.
The following example shows how to enable the BFD for BGP, and detect the
forwarding path with the neighbor 172.16.0.2:
DES-7200# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
DES-7200(config)# interface FastEthernet 0/1
DES-7200(config-if)# no switchport
DES-7200(config-if)# ip address 172.16.0.1 255.255.255.0
DES-7200(config-if)# bfd interval 50 min_rx 50 multiplier 3
DES-7200(config-if)# exit
DES-7200(config)# router bgp 44000
DES-7200(config-router)# bgp log-neighbors-changes
DES-7200(config-router)# neighbor 172.16.0.2 remote-as 45000