Example for Configuring BFD for PIM-SM
- Tracy Yang
Networking Requirements
As shown in Figure 1, PIM-SM is configured between SwitchA and SwitchB, and the L2 switch between SwitchA and SwitchB only provides the transparent transmission function. Users can configure BFD sessions on SwitchA and SwitchB so that faults on the link between SwitchA and SwitchB can be detected rapidly.
Figure 1 Configuring BFD for PIM-SM
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 Configure basic PIM functions.
admin@SwitchA# set protocols pim interface vlan13 sm
Step3 Enable BFD and create a BFD session for PIM on SwitchA.
admin@SwitchA# set protocols pim interface vlan13 bfd
Step4 Commit the configuration.
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 configuration.
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 Configure basic PIM functions.
admin@SwitchB# set protocols pim interface vlan13 sm
Step3 Enable BFD and create a BFD session for PIM on SwitchB.
admin@SwitchB# set protocols pim interface vlan13 bfd
Step4 Commit the configuration.
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 BFD session between SwitchA and SwitchB is set up and its status is up.
admin@SwitchA# run show bfd peers brief Session count: 1 SessionId LocalAddress PeerAddress Status ========= ============ =========== ====== 406990062 10.10.13.1 10.10.13.3 up admin@SwitchB# run show bfd peers brief Session count: 1 SessionId LocalAddress PeerAddress Status ========= ============ =========== ====== 1576079599 10.10.13.3 10.10.13.1 up
- Run command run show pim neighbor to show information about PIM neighbors.
admin@SwitchA# run show pim neighbor Interface Neighbor Uptime Holdtime DR Pri vlan13 10.10.13.3 00:01:42 00:01:33 1 admin@SwitchB# run show pim neighbor Interface Neighbor Uptime Holdtime DR Pri vlan13 10.10.13.1 00:02:51 00:01:24 1
- 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 BFD session between SwitchA and SwitchB is set up but its status is down.
admin@SwitchA# run show bfd peers brief Session count: 1 SessionId LocalAddress PeerAddress Status ========= ============ =========== ====== 406990062 10.10.13.1 10.10.13.3 down admin@SwitchB# run show bfd peers brief Session count: 1 SessionId LocalAddress PeerAddress Status ========= ============ =========== ====== 1576079599 10.10.13.3 10.10.13.1 down
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