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:

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