3Com 10014299 manual Configuring Vrrp, Adding a Virtual IP, Address

654CHAPTER 46: CONFIGURING VRRP

Figure 208 Virtual router diagram

Real IP Address:	Network	Real IP Address:
10.10.100.2		10.10.100.3
	Router	Router
MASTER	Virtual IP Address:	BACKUP
	10.10.100.1
	Ethernet

PCPCPC

	This virtual router has its own IP address: 10.100.10.1 (it can be the same as the
	interface address of a router within the standby group). The routers within the
	standby group have their own IP addresses (10.100.10.2 for the master routers
	and 10.100.10.3 for the backup routers). The host within the LAN only knows the
	IP address of this virtual router but not the specific IP addresses of the master
	router and the backup router. They configure their own default routes as the IP
	address of this virtual router. Therefore, hosts within the network communicate
	with the external network through this virtual router. If a master router in the
	virtual group breaks down, another backup router function as the new master
	router to continue serving the host with routing to avoid interrupting the
	communication between the host and the external networks.
	For the details of VRRP, refer to RFC 2338.
Configuring VRRP	■ Configuring VRRP includes tasks that are described in the following section:s
	■ Add Virtual IP AddAdding a Virtual IP Addressress
	■ Configuring Router Priority in a Standby Group
	■ Configuring Preemption Mode and Delay of Standby Group Routers
	■ Configuring the Authentication Method and Authentication Key
	■ Configure Standby Group Timer
	■ Monitoring the Specified Interface
Adding a Virtual IP	Add one IP address of the standby group network-segment to this standby group
Address	(also called a virtual router).
	Perform the following configuration in Ethernet interface view: