Example for Configuring Multi-Hop BFD
- Tracy Yang
Networking Requirements
As shown in Figure 1, SwitchA and SwitchC are connected through the Layer 3 switch SwitchB. Users can configure multi-hop BFD session on SwitchA and SwitchC so that faults on the multi-hop link between SwitchA and SwitchC can be detected rapidly.
Figure 1 Multi-hop BFD for detecting faults
Procedure
Switch A
Step1 Configure VLAN interface.
admin@SwitchA# set vlans vlan-id 12 admin@SwitchA# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 12 admin@SwitchA# set l3-interface vlan-interface vlan12 address 10.10.12.1 prefix-length 24 admin@SwitchA# set vlans vlan-id 12 l3-interface vlan12
Step2 Configure a static route for connection between SwitchA and SwitchC.
admin@SwitchA# set protocols static route 10.10.23.0/24 next-hop 10.10.12.2
Step3 Enable BFD and create a multi-hop BFD session on SwitchA.
admin@SwitchA# set protocols bfd multihop peer 10.10.23.1 local-address 10.10.12.1
Step4 Commit the configurations.
admin@SwitchA# commit
Switch B
Step1 Configure VLAN interface.
admin@SwitchB# set vlans vlan-id 12 admin@SwitchB# set vlans vlan-id 23 admin@SwitchB# set interface gigabit-ethernet ge-1/1/1 family ethernet-switching native-vlan-id 12 admin@SwitchB# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 23 admin@SwitchB# set l3-interface vlan-interface vlan12 address 10.10.12.2 prefix-length 24 admin@SwitchB# set l3-interface vlan-interface vlan23 address 10.10.23.2 prefix-length 24 admin@SwitchB# set vlans vlan-id 12 l3-interface vlan12 admin@SwitchB# set vlans vlan-id 23 l3-interface vlan23
Step2 Commit the configurations.
admin@SwitchB# commit
Switch C
Step1 Configure VLAN interface.
admin@SwitchC# set vlans vlan-id 23 admin@SwitchC# set interface gigabit-ethernet ge-1/1/2 family ethernet-switching native-vlan-id 23 admin@SwitchC# set l3-interface vlan-interface vlan23 address 10.10.23.1 prefix-length 24 admin@SwitchC# set vlans vlan-id 23 l3-interface vlan23
Step2 Configure a static route for connection between SwitchA and SwitchC.
admin@SwitchC# set protocols static route 10.10.12.0/24 next-hop 10.10.23.2
Step3 Enable BFD and create a multi-hop BFD session on SwitchC.
admin@SwitchC# set protocols bfd multihop peer 10.10.12.1 local-address 10.10.23.1
Step4 Commit the configurations.
admin@SwitchC# commit
Verify the Configuration
- After the configuration is complete, run the command run show bfd peers brief on SwitchA and SwitchC. You can see that a multi-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 ========= ============ =========== ====== 2486827319 10.10.12.1 10.10.23.1 up admin@SwitchC# run show bfd peers brief Session count: 1 SessionId LocalAddress PeerAddress Status ========= ============ =========== ====== 1810426318 10.10.23.1 10.10.12.1 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 SwitchC. You can see that a multi-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 ========= ============ =========== ====== 2486827319 10.10.12.1 10.10.23.1 down admin@SwitchC# run show bfd peers brief Session count: 1 SessionId LocalAddress PeerAddress Status ========= ============ =========== ====== 1810426318 10.10.23.1 10.10.12.1 down
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