H3C Technologies H3C S10500 Series Switches - Manual (Page 190)

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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,
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
Figure
49 , 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 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
B can preempt as the master, ensuring that the hosts in the LAN can access the external network
through Switch B.
Figure 49 Network diagram for monitoring uplinks using BFD
Internet
Master
uplink device
Backup
uplink device
Uplink
Virtual router
Virtual IP address:
192.168.0.10
Vlan-int2
192.168.0.101/24
Vlan-int2
192.168.0.102/24
Switch A
Master
Switch B
Backup
Vlan-int3
1.1.1.1/24
Vlan-int3
1.1.1.2/24
L2 switch
Uplink
VRRP packets
BFD probe packets
Configuration procedure
1. Create VLANs, and assign corresponding ports to the VLANs. Configure the IP address of each
VLAN interface as shown in Figure 49 . (Details not shown)
2. Configure BFD on Switch A.
# Configure the source address of BFD echo packets as 10.10.10.10.
<SwitchA> system-view
[SwitchA] bfd echo-source-ip 10.10.10.10