3com S7906E 설치 설명서

 

1-3 

Figure 1-2 Network diagram for VRRP 

Host A

Host B

Host C

Router A

Router B

Router C

Network

 

 

As shown in 

, Router A, Router B, and Router C form a virtual router, which has its own IP 

address. Hosts on the Ethernet use the virtual router as the default gateway. 

The router with the highest priority of the three routers is elected as the master to act as the gateway, 

and the other two are backups. 

 

z 

The IP address of the virtual router can be either an unused IP address on the segment where the 

VRRP group resides or the IP address of an interface on a router in the VRRP group. In the latter 

case, the router is called the IP address owner. 

z 

In a VRRP group, you can configure only one IP address owner. 

z 

Status of a router in a VRRP group includes master, backup, and initialize. 

 

VRRP determines the role (master or backup) of each router in the VRRP group by priority. A router with 

a higher priority has more opportunity to become the master. 

VRRP priority is in the range of 0 to 255. The greater the number, the higher the priority. Priorities 1 to 

254 are configurable. Priority 0 is reserved for special uses and priority 255 for the IP address owner. 

When a router acts as the IP address owner, its running priority is always 255. That is, the IP address 

owner in a VRRP group acts as the master as long as it works properly.  

 

If two routers are both in the master state and have the same priority, the router with a higher IP address 

becomes the master.