H3C Technologies H3C MSR 5600 - Manual (Page 77)

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# Display information about track entry 1 on Router B.
display track 1
Track ID: 1
State: Positive
Duration: 0 days 0 hours 0 minutes 32 seconds
Notification delay: Positive 0, Negative 0 (in seconds)
Tracked object:
BFD session mode: Echo
Outgoing Interface: Ethernet1/1
VPN instance name: -
Remote IP: 192.168.0.101
Local IP: 192.168.0.102
The output shows that when the status of the track entry becomes Positive, Router A is the master, and
Router B the backup.
# Enable VRRP state debugging and BFD event debugging on Router B.
terminal debugging
terminal monitor
debugging vrrp state
debugging bfd event
# When Router A fails, the following output is displayed on Router B.
*Dec 17 14:44:34:142 2008 RouterB BFD/7/EVENT:Send sess-down Msg,
[Src:192.168.0.102,Dst:192.168.0.101,Ethernet1/1,Echo], instance:0, protocol:Track
*Dec 17 14:44:34:144 2008 RouterB VRRP/7/DebugState: IPv4 Ethernet1/1 | Virtual Router
1 : Backup --> Master reason: The status of the tracked object changed
# Display detailed information about the VRRP group on Router B.
display vrrp verbose
IPv4 Virtual Router Information:
Running Mode : Standard
Total number of virtual routers : 1
Interface Ethernet1/1
VRID : 1 Adver Timer : 100
Admin Status : Up State : Master
Config Pri : 100 Running Pri : 100
Preempt Mode : Yes Delay Time : 0
Auth Type : None
Virtual IP : 192.168.0.10
Virtual MAC : 0000-5e00-0101
Master IP : 192.168.0.102
VRRP Track Information:
Track Object : 1 State : Negative Switchover
The output shows that when BFD detects that Router A fails, it notifies VRRP through the Track module to
change the status of Router B to master without waiting for a period three times the advertisement interval.
This ensures that a backup can quickly preempt as the master.