Cabletron Systems manual SmartSwitch Router User Reference Manual 101

Chapter 7: VRRP Configuration Guide

Configuration of Router R1

The following is the configuration file for Router R1 in Figure 6.

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

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.

SmartSwitch Router User Reference Manual 101