Configuring Bfd For The Vrrp Master To Monitor The Uplinks - HP A5830 series Configuration Manual

BFD session:
Packet type: Echo
Interface
Remote IP
Local IP
The output shows that when the status of the track entry becomes Positive, Switch A is the master, and
Switch B the backup.
# Enable VRRP state debugging and BFD event debugging on Switch B.
<SwitchB> terminal debugging
<SwitchB> terminal monitor
<SwitchB> debugging vrrp state
<SwitchB> debugging bfd event
# When Switch A fails, the following output is displayed on Switch B.
*Dec 17
[Src:192.168.0.102,Dst:192.168.0.101,Vlan-interface2,Echo], instance:0, protocol:Track
*Dec 17 14:44:34:144 2008 SwitchB VRRP/7/DebugState: IPv4 Vlan-interface2 | Virtual
Router 1 : Backup --> Master
# Display the detailed information of the VRRP group on Switch B.
<SwitchB> display vrrp verbose
IPv4 Standby Information:
Run Mode
Run Method
Total number of virtual routers : 1
Interface Vlan-interface2
VRID
Admin Status
Config Pri
Preempt Mode
Auth Type
Virtual IP
Virtual MAC
Master IP
VRRP Track Information:
Track Object
The output shows that when BFD detects that Switch A fails, it notifies VRRP through the track module to
change the status of Switch 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 uplinks

Network requirements
As shown in
•
192.168.0.10.
The default gateway of the hosts in the LAN is 192.168.0.10.
•
When Switch A works normally, the hosts in the LAN access the external network through Switch A.
•
When Switch A detects that the uplink is down through BFD, it decreases its priority so that Switch
: Vlan-interface2
: 192.168.0.101
: 192.168.0.102
14:44:34:142 2008
reason: The status of the tracked object changed
: Standard
: Virtual MAC
: 1
: Up
: 100
: Yes
: None
: 192.168.0.10
: 0000-5e00-0101
: 192.168.0.102
: 1
47, Switch A and Switch B belong to VRRP group 1, whose virtual IP address is
Figure
SwitchB BFD/7/EVENT:Send
Adver Timer : 1
State : Master
Running Pri : 100
Delay Time : 0
State : Negative
173
sess-down
Switchover
Msg,