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Auto Detect Implementation in VRRP 69
# Detect the reachability of 10.1.1.3, with the next hop being 192.168.1.1/24,
and the detecting number being 1.
[SwitchC-detect-group-9] detect-list 1 ip address 192.168.1.1 nextho
p 10.1.1.3
[SwitchC-detect-group-9] quit
# Configure a static route to Switch A.
[SwitchC] ip route-static 192.168.1.1 24 10.1.1.3
# Configure the master route, which is valid when the detected group is
reachable.
[SwitchC] ip route-static 192.168.2.1 24 10.1.1.3 detect-group 9
# Configure the backup static route, and set its preference to 80. The backup
route is valid when the detected group is unreachable.
[SwitchC] ip route-static 192.168.2.1 24 10.1.2.2 preference 80
n
This configuration procedure only provides the auto-detect related configuration.
To ensure the normal communication between Host A and Host C, corresponding
static routes must already exist on Switch B and Switch D.
Complete Configuration
■ Configure Switch A
#
detect-group 8
detect-list 1 ip address 10.1.1.4 nexthop 192.168.1.2
#
ip route-static 10.1.1.0 255.255.255.0 192.168.1.2 preference 60
ip route-static 10.1.3.0 255.255.255.0 192.168.1.2 preference 60 de
tect-group 8
ip route-static 10.1.3.0 255.255.255.0 192.168.3.2 preference 80
#
■ Configure Switch C
#
detect-group 9
detect-list 1 ip address 192.168.1.1 nexthop 10.1.1.3
#
ip route-static 192.168.1.0 255.255.255.0 10.1.1.3 preference 60
ip route-static 192.168.2.0 255.255.255.0 10.1.1.3 preference 60 de
tect-group 9
ip route-static 192.168.2.0 255.255.255.0 10.1.2.2 preference 80
#
Precautions None
Auto Detect
Implementation in
VRRP
You can use the auto detect function on the master switch of a VRRP group to
detect the routes from the master switch to other networks, and use the detection
results (reachable/unreachable) to control the priority of the master switch, so as
to realize the automatic master-backup switchover: