RuggedCom RuggedRouter RX1100 - Manual (Page 190)

19. Configuring VRRP
Revision 1.14.3 190 RX1000/RX1100™
Each Virtual Router has a user-configured Virtual Router Identifier (VRID) and an Virtual IP address
or set of IP addresses on the shared LAN. Hosts on the shared LAN are configured to use these
addresses as the default gateway.
One router in the Virtual Router Group will be elected as the Master, all other routers in the group
will be Backups.
Each router in the group will run at a specific Priority. The router with the highest priority is elected
Master. The value of Priority varies from 1 to 255.
VRRP can also monitor a specified interface and give up control of a VRIP if that interface goes down.
In the following network, host 1 uses a gateway of 1.1.1.253 and host 2 uses a gateway of 1.1.1.252.
The 1.1.1.253 gateway is provided by VRID 10. In normal practice router 1 will provide this virtual IP
as its priority for VRID 10 is higher than that of router 2. If router 1 becomes inoperative or if its w1ppp
link fails, it will relinquish control of VRIP 1.1.1.253 to router 2.
In a similar fashion host 2 can use the VRID 11 gateway address of 1.1.1.252 which will normally
be supplied by router 2.
Figure 19.1. VRRP Example
In this example traffic from host1 will be sent through router 1 and traffic from host2 through router 2.
A failure of either router (or its wan link) will be recovered by the other router.
Note that both routers can always be reached by the hosts at their “real” IP addresses.
Two or more VRRP instances can be assigned to be in the same VRRP Group, in which case, they
can fail over together.