H3C Technologies H3C SecPath F1000-E - Manual (Page 300)

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Packet type: Echo
Interface : GigabitEthernet1/1
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, Device A is the master and
Device B the backup.
# Enable VRRP state debugging and BFD event debugging on Device B.
terminal debugging
terminal monitor
debugging vrrp state
debugging bfd event
# When Device A fails, the following output information is displayed on Device B.
*Dec 17 14:44:34:142 2008 DeviceB BFD/7/EVENT:Send sess-down Msg,
[Src:192.168.0.102,Dst:192.168.0.101,GigabitEthernet1/1,Echo], instance:0,
protocol:Track
*Dec 17 14:44:34:144 2008 DeviceB VRRP/7/DebugState: IPv4 GigabitEthernet1/1 | Virtual
Router 1 : Backup --> Master reason: The status of the tracked object changed
# Display the detailed information of the VRRP group on Device B.
display vrrp verbose
IPv4 Standby Information:
Run Mode : Standard
Run Method : Virtual MAC
Total number of virtual routers : 1
Interface GigabitEthernet1/1
VRID : 1 Adver Timer : 1
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 Device A fails, it notifies VRRP through the track module to
change the status of Device B to master, without waiting for a period three times the advertisement
interval so that a backup can quickly preempt as the master.
Configuring BFD for the VRRP Master to Monitor the Uplink
Network requirements
• As shown in Figure 4 , Device A and Device B belong to VRRP group 1, whose virtual IP address is
192.168.0.10.
• The default gateway of the hosts in the LAN is 192.168.0.10.