3Com 10014299 Debugging Vrrp, Configure Standby, Group Timer, Monitoring, Specified Interface

		Displaying and Debugging VRRP 657
Configure Standby	The master router of a VRRP standby group notifies its normal operation state to
Group Timer	the routers within the group by sending them VRRP packets regularly
	(adver_interval). If the backup routers fail to receive the VRRP packets over a
	certain period of time (master_down_interval), they reach the conclusion that the
	master routers are not functioning properly and will change their own state to
	master.
	The user can adjust the master routers' sending interval (adver_interval) of VRRP
	packets by configuring the timer command. The master_down_interval of the
	backup routers are three times that of the adver_interval. Too much network
	traffic or the differences of different router timers will result in abnormal
	master_down_interval and state switchover. Such problems can be solved through
	prolonging the adver_interval and configuring delay time.
	Perform the following configuration in interface view:
	Table 708 Configure VRRP Timer
	Operation	Command
	Configure VRRP timer	vrrp vrid virtual_router_id
		timer-advertise seconds
	Restore the default value of VRRP timer	undo vrrp vrid virtual_router_id
		timer-advertise
	By default adver_interval is set 1 seconds, namely, the default value of
	adver_interval is 1 second, while the default value of master_down_interval is 3
	seconds.
Monitoring the	The interface monitoring function of VRRP expands backup function: when the
Specified Interface	interface of the router is unavailable, it is regarded that the router is not stable,
	hence it should not act as a master router. After the interface monitoring function
	is set, the router's priority will be adjusted dynamically according to the state of
	the interface that is under monitoring. Once the monitored interface becomes
	unavailable, the priority value of this router is reduced, so that another router with
	a more stable interface state in the same backup group can act as a master router
	more easily
	Perform the following configuration in Ethernet interface view:
	Table 709 Configure Monitoring Interface
	Operation	Command
	Set to monitor the specified interface	vrrp vrid virtual_router_id track
		interface_type interface_number [
		reduced priority ]
	Cancel the monitoring of the specified	undo vrrp vrid virtual_router_id
	interface	track interface_type
		interface_number
	By default interface-priority is 10.
Displaying and	Perform the display and debugging commands in all views.
Debugging VRRP