Example for Configuring Single-Hop BFD

Owned by Tracy Yang
Nov 13, 2023

Networking Requirements

As shown in Figure 1, SwitchA and SwitchB are connected through the Layer 2 switch. Users can configure BFD sessions on SwitchA and SwitchB so that faults on the link between SwitchA and SwitchB can to be detected rapidly. 

Figure 1 Single-hop BFD for detecting faults

Procedure

Switch A

Step1          Configure VLAN interface.

admin@SwitchA# set vlans vlan-id 13
admin@SwitchA# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 13
admin@SwitchA# set l3-interface vlan-interface vlan13 address 10.10.13.1 prefix-length 24
admin@SwitchA# set vlans vlan-id 13 l3-interface vlan13

Step2          Enable BFD and create a single-hop BFD session on SwitchA.

admin@SwitchA# set protocols bfd interface vlan13 peer 10.10.13.3

Step3          Commit the configurations.

admin@SwitchA# commit

L2 Switch

Step1          Configure the VLAN.

admin@L2Switch# set vlans vlan-id 13
admin@L2Switch# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 13
admin@L2Switch# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 13

Step2          Commit the configurations.

admin@L2Switch# commit

Switch B

Step1          Configure VLAN interface.

admin@SwitchB# set vlans vlan-id 13
admin@SwitchB# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 13
admin@SwitchB# set l3-interface vlan-interface vlan13 address 10.10.13.3 prefix-length 24
admin@SwitchB# set vlans vlan-id 13 l3-interface vlan13

Step2          Enable BFD and create a BFD session on SwitchB.

admin@SwitchB# set protocols bfd interface vlan13 peer 10.10.13.1

Step3          Commit the configurations.    

admin@SwitchB# commit

Verify the Configuration

  • After the configuration is complete, run the command run show bfd peers brief on SwitchA and SwitchB. You can see that a single-hop BFD session is set up and its status is up.
admin@SwitchA# run show bfd peers brief 
Session count: 1
SessionId  LocalAddress                             PeerAddress                             Status         
=========  ============                             ===========                             ======         
2107973506 10.10.13.1                                10.10.13.3                              up

admin@SwitchB# run show bfd peers brief 
Session count: 1
SessionId  LocalAddress                             PeerAddress                             Status         
=========  ============                             ===========                             ======         
1620807635 10.10.13.3                                10.10.13.1                              up
  • Run the set interface gigabit-ethernet ge-1/1/2 disable true command on the GE-1/1/2 interface of SwitchB to simulate a link fault.
admin@SwitchB# set interface gigabit-ethernet ge-1/1/2 disable true
admin@SwitchB# commit
  • After the configuration is complete, run the command run show bfd peers brief on SwitchA and SwitchB. You can see that a single-hop BFD session is set up and its status is down.
admin@SwitchA# run show bfd peers brief 
Session count: 1
SessionId  LocalAddress                             PeerAddress                             Status         
=========  ============                             ===========                             ======         
2107973506 10.10.13.1                                10.10.13.3                              down

admin@SwitchB# run show bfd peers brief 
Session count: 1
SessionId  LocalAddress                             PeerAddress                             Status         
=========  ============                             ===========                             ======         
1620807635 10.10.13.3                                10.10.13.1                              down








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