3Com 3500 manual Define the virtual, Backup Index number of an IP Virtual LAN Vlan that

ip vrrp define 493

Advertisement Intervals

■When you define a Primary router on a VLAN that contains a single interface, the single interface is automatically chosen as the primary address when you select IP-addressas the Address mode.

■When you define a Backup virtual router, selecting auto-learnas the address mode configures the Backup router to learn the IP addresses that are associated with the virtual router by means of VRRP advertisements from the Primary router. The Primary router must be up for backup routers to auto-learn the addresses that are associated with the specified VRID.

■When you define Backup virtual routers, the auto-learn address mode option enables auto address learning for the specified VRID. If a new interface is added to the VLAN on a primary virtual router, the new IP address is sent out in VRRP advertisements so that the Backup routers in auto-learn mode can learn the new address without having to manually add the new address to each backup router.

■The smaller the advertisement interval, the smaller the failover time if the master fails.

■The advertisement interval must be the same across the set of VRRP routers that are associated with a single VRID. Backup routers must have the same advertisement interval as the Master router.

Options

Prompt Description Possible Values [Default]

Virtual router type Type of virtual router that you want to define

VLAN interface	Index number of the
index	virtual LAN (VLAN) on
	which you want to
	define the virtual
	router

■ Primary Primary

■Backup

■ Index number of an IP	Index
virtual LAN (VLAN) that	number of
is defined on the	first
system.	available
■ ? (for a list of selectable	VLAN
indexes)

VRID	Virtual router	1 – 255		1
	identifier. Identifies
	the virtual router that
	you want to define on
	the LAN.
Address mode	Method by which the	■	auto-learn	auto-learn
	virtual router you	■	IP address
	want to define learns

its IP addresses