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DES-7200 Configuration Guide Chapter 3 BFD Configuration
3-44
I Hear You bit: 1 - Demand bit: 0
Poll bit: 0 - Final bit: 0
Multiplier: 3 - Length: 24
My Discr.: 2 - Your Discr.: 1
Min tx interval: 50000 - Min rx interval: 50000
Min Echo interval: 0
2) View the BFD session of RouterB
DES-7200# show bfd neighbors details
OurAddr NeighAddr LD/RD RH Holdown(mult) State Int
192.168.3.2 192.168.3.1 2/1 1 532 (5 ) Up
Ge2/1
Local Diag: 0, Demand mode: 0, Poll bit: 0
MinTxInt: 50000, MinRxInt: 50000, Multiplier: 3
Received MinRxInt: 200000, Received Multiplier: 5
Holdown (hits): 600(22), Hello (hits): 200(84453)
Rx Count: 49824, Rx Interval (ms) min/max/avg: 209/440/332 last: 66 ms ago
Tx Count: 84488, Tx Interval (ms) min/max/avg: 153/249/197 last: 190 ms ago
Registered protocols: PBR
Uptime: 02:18:49
Last packet: Version: 1 - Diagnostic: 0
I Hear You bit: 1 - Demand bit: 0
Poll bit: 0 - Final bit: 0
Multiplier: 5 - Length: 24
My Discr.: 1 - Your Discr.: 2
Min tx interval: 200000 - Min rx interval: 200000
Min Echo interval: 0
3.4.6 Example of Configuring BFD
for VRRP
3.4.6.1 Network Requirement
RouterA and RouterB are interconnected through a L2 switch. Both routers
run the VRRP protocol and enable the BFD for PBR on the interface to detect
the master and backup routers. After a link failure between RouterB and L2
switch occurs, BFD detects the failure, notifies VRRP of the failure, and
triggers the priority level decline of the VRRP master router resulting in the
switchover between the master and backup routers, which enables the
backup router rapidly.
RouterA and RouterB access the Internet through RouterC and RouterD
respectively. Configure the static routes to establish the forwarding path
between RouterA and RouterC, RouterB and RouterD and enable the BFD to