12-6 Riverstone Networks RS Switch Router User Guide Release 8.0
Configuring VRRP VRRP Configuration Guide
In this configuration, Router R1 is the Master for virtual router VRID=1 and the primary Backup for virtual routers
VRID=2 and VRID=3. If Router R2 or R3 were to go down, Router R1 would assume the IP addresses associated with
virtual routers VRID=2 and VRID=3.
Router R2 is the Master for virtual router VRID=2, the primary backup for virtual router VRID=1, and the secondary
Backup for virtual router VRID=3. If Router R1 should fail, Router R2 would become the Master for virtual router
VRID=1. If both Routers R1 and R3 should fail, Router R2 would become the Master for all three virtual routers.
Packets sent to IP addresses 10.0.0.1/16, 10.0.0.2/16, and 10.0.0.3/16 would all go to Router R2.
Router R3 is the secondary Backup for virtual routers VRID=1 and VRID=2. It would become a Master router only if
both Routers R1 and R2 should fail. In such a case, Router R3 would become the Master for all three virtual routers.
Configuration of Router R1
The following is the configuration file for Router R1 in Figure12-3.
Router R1’s IP address on interface test is 10.0.0.1. There are three virtual routers on this interface:
•VRID=1 – IP address=10.0.0.1/16
•VRID=2 – IP address=10.0.0.2/16
•VRID=3 – IP address=10.0.0.3/16
Since the IP address of virtual router VRID=1 is the same as the interface’s IP address (10.0.0.1), then the router
automatically becomes the address owner of virtual router VRID=1.
A priority is associated with each of the virtual routers. The priority determines whether the router will become the
Master or the Backup for a particular virtual router. Priorities can have values between 1 and 255. When a Master router
goes down, the router with the next-highest priority takes over the virtual router. If more than one router has the
next-highest priority, the router that has the highest-numbered interface IP address becomes the Master.
If a router is the address owner for a virtual router, then its priority for that virtual router is 255 and cannot be changed.
If a router is not the address-owner for a virtual-router, then its priority for that virtual router is 100 by default, and can
be changed by the user.
Since Router R1 is the owner of the IP address associated with virtual router VRID=1, it has a priority of 255 (the
highest) for virtual router VRID=1. Lines 8 and 9 set Router R1’s priority for virtual routers VRID=2 and VRID=3 at
200. If no other routers in the VRRP configuration have a higher priority, Router R1 will take over as Master for virtual
routers VRID=2 and VRID=3, should Router R2 or R3 go down.
1: interface create ip test address-netmask 10.0.0.1/16 port et.1.1
!
2: ip-redundancy create vrrp 1 interface test
3: ip-redundancy create vrrp 2 interface test
4: ip-redundancy create vrrp 3 interface test
!
5: ip-redundancy associate vrrp 1 interface test address 10.0.0.1/16
6: ip-redundancy associate vrrp 2 interface test address 10.0.0.2/16
7: ip-redundancy associate vrrp 3 interface test address 10.0.0.3/16
!
8: ip-redundancy set vrrp 2 interface test priority 200
9: ip-redundancy set vrrp 3 interface test priority 200
!
10: ip-redundancy start vrrp 1 interface test
11: ip-redundancy start vrrp 2 interface test
12: ip-redundancy start vrrp 3 interface test