R211x-HP Flexfabric 11900 High Availability Configuration Guide

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 fsm

<SwitchB> debugging bfd event

When Switch A fails, the following output is displayed on Switch B.

*Dec 17 14:44:34:142 2013 SwitchB BFD/7/EVENT:Send sess-down Msg,

[Src:192.168.0.102,Dst:192.168.0.101,Vlan-interface2,Echo], instance:0, protocol:Track

*Dec 17 14:44:34:144 2013 SwitchB VRRP4/7/FSM:

IPv4 Vlan-interface2 | Virtual Router 1 : Backup --> Master reason: The status of the

tracked object changed

# Display detailed information about the VRRP group on Switch B.

<SwitchB> display vrrp verbose

IPv4 Virtual Router Information:

Running Mode : Standard

Total number of virtual routers : 1

Interface Vlan-interface2

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 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.

This ensures that a backup can quickly preempt as the master.

Configuring BFD for the VRRP master to monitor the uplinks

Network requirements

As shown in Figure 23, Switch A and Switch 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.

When Switch A works correctly, 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 B can

preempt as the master, ensuring that the hosts in the LAN can access the external network through Switch