The VRRP priority range is 0-255 (a larger number indicates a
higher priority). The router with higher priority will be more likely
to become the gateway router.
If the router works in the preemptive mode, once it finds that its own
priority is higher than that of the current gateway router, it will send
VRRP notification package, resulting in re-election of gateway
router and eventually replacing the original gateway router.
Accordingly, the original gateway router will become a Backup
router.
The monitoring interface function of VRRP can better expand the
backup function: It not only provides the backup function in case of
fault of a router’s interface, but also provides the backup function in
case that other interfaces (e.g. interfaces connecting the uplink) of
router are not available.
In case of fault with the interface of router that is connected to the
uplink and the virtual ip group can not perceive the uplink failure, if
the router is the gateway status, it will cause the host in LAN unable
to access to the external network. The problem can be solved
through the function of monitoring the specified interface. When the
interface connecting to the uplink is in the status of Down or
Removed, the router will initiatively reduce its own priority to let
other routers in the backup group have higher priority than this
router, so that the router with the highest priority will become the
gateway to undertake the forwarding task.
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