# Before You Configure VRRP

Before you configure VRRP, you must configure an IP interface and assign a primary IP address and subnet mask. When the IP address belongs to the owner of the VRID, you must associate the IP address with the VRID that you create.

To configure the IP interface for VRRP:

1. Configure an IP interface.
   host1(config)#interface fastEthernet 4/0
2. Assign an IP address and a subnet mask.
   host1(config-if)#ip address 194.50.1.42 255.255.255.0

   | Note: We recommend that you complete all IP address configurations before you configure VRRP. If for any reason the IP address information changes after you configure VRRP, you must revise the associated IP addresses configured on the related VRRP entries. If you specify auto addresses in the ip vrrp virtual-address command along with using priority 255, you must disable and reenable the VRRP entry to update the association list.

#### Related Documentation

- Configuring VRRP
- VRRP Overview