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Bidirectional Forwarding Detection | 183
Figure 9-11. Establishing Sessions with OSPF Neighbors
To establish BFD with all OSPF neighbors:
To establish BFD for all OSPF neighbors on a single interface:
View the established sessions using the command
show bfd neighbors, as shown in Figure 9-12.
Figure 9-12. Viewing Established Sessions for OSPF Neighbors
Step Task Command Syntax Command Mode
1 Establish sessions with all OSPF neighbors.
bfd all-neighbors
ROUTER-OSPF
Step Task Command Syntax Command Mode
1 Establish sessions with all OSPF neighbors on a
single interface.
ip ospf bfd all-neighbors
INTERFACE
2.2.2.1/24
2.2.3.1/24
fnC0040mp
4/24
2/1
2/2
6/0
AREA 0
AREA 1
6/1
1/1
Force10(conf-if-gi-4/24)# ip address 2.2.2.1/24
Force10(conf-if-gi-4/24)# no shutdown
Force10(conf-if-gi-4/24)# exit
Force10(config)# router ospf 1
Force10(config-router_ospf)# network 2.2.2.0/24 area 0
Force10(config-router_ospf)# bfd all-neighbors
Force10(conf-if-gi-2/1)# ip address 2.2.2.2/24
Force10(conf-if-gi-2/1)# no shutdown
Force10(conf-if-gi-2/1)# exit
Force10(config)# router ospf 1
Force10(config-router_ospf)# network 2.2.2.0/24 area 0
Force10(config-router_ospf)# bfd all-neighbors
Force10(conf-if-gi-2/2)# ip address 2.2.3.1/24
Force10(conf-if-gi-2/2)# no shutdown
Force10(conf-if-gi-2/2)# exit
Force10(config)# router ospf 1
Force10(config-router_ospf)# network 2.2.3.0/24 area 1
Force10(config-router_ospf)# bfd all-neighbors
Force10(conf-if-gi-6/1)# ip address 2.2.4.1/24
Force10(conf-if-gi-6/1)# no shutdown
Force10(conf-if-gi-6/1)# exit
Force10(config)# router ospf 1
Force10(config-router_ospf)# network 2.2.4.0/24 area
1
Force10(config-router_ospf)# bfd all-neighbors
Force10(conf-if-gi-6/0)# ip address 2.2.3.2/24
Force10(conf-if-gi-6/0)# no shutdown
Force10(conf-if-gi-6/0)# exit
Force10(config)# router ospf 1
Force10(config-router_ospf)# network 2.2.3.0/24 area 1
Force10(config-router_ospf)# bfd all-neighbors
Force10(conf-if-gi-6/0)# ip address 2.2.4.2/24
Force10(conf-if-gi-6/0)# no shutdown
Force10(conf-if-gi-6/0)# exit
Force10(config)# router ospf 1
Force10(config-router_ospf)# network 2.2.4.0/24 area 1
Force10(config-router_ospf)# bfd all-neighbors
2.2.2.2/24
2.2.3.2/24
2.2.4.1/24
2.2.4.2/24
R1
R3R2
R4
R2(conf-router_ospf)#bfd all-neighbors
R2(conf-router_ospf)#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
* 2.2.2.2 2.2.2.1 Gi 2/1 Up 100 100 3 O
OSPF BFD Sessions Enabled