Configuration procedure – H3C Technologies H3C SecPath F1000-E User Manual
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When Device A works normally, hosts in the LAN access the external network through Device A.
When Device A detects that the uplink is down through BFD, it decreases its priority so that Device
B can preempt as the master, thus ensuring that the hosts in the LAN can access the external
network through Device B.
Figure 4 Network diagram for monitoring uplinks using BFD
Internet
Master
Uplink device
Backup
Uplink
device
Uplink
Virtual Router
Virtual IP address:
192.168.0.10
GE1/2
192.168.0.101/24
GE1/2
192.168.0.102/24
Device A
Master
Device B
Backup
GE1/1
1.1.1.1/24
GE1/1
1.1.1.2/24
L2 switch
Uplink
VRRP packets
BFD probe packets
Configuration procedure
Step1
Configure BFD on Device A.
# Configure the source address of BFD echo packets as 10.10.10.10.
[DeviceA] bfd echo-source-ip 10.10.10.10
Step2
Create the track entry to associate with the BFD session on Device A
# Create track entry 1 for the BFD session on Device A to check whether the uplink device with the IP
address 1.1.1.2 is reachable.
[DeviceA] track 1 bfd echo interface gigabitethernet 1/1 remote ip 1.1.1.2 local ip 1.1.1.1
Step3
Configure VRRP on Device A
# Create VRRP group 1, and configure the virtual IP address of the group as 192.168.0.10; configure the
priority of Device A in VRRP group 1 as 110; configure VRRP group 1 to monitor the status of track entry
1. When the status of the track entry becomes Negative, the priority of Device A decreases by 20.
[DeviceA] interface gigabitethernet 1/2
[DeviceA-GigabitEthernet1/2] vrrp vrid 1 virtual-ip 192.168.0.10