Example for Configuring Single-Hop BFD
- Tracy Yang
Owned by Tracy Yang
Mar 19, 2024
5 min read
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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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