Configuration Overview; Basic Virtual Router Configuration; Creating A Virtual Router - Alcatel OmniSwitch 6624 Network Configuration Manual

Configuring VRRP

Configuration Overview

VRRP is part of the base software. At startup, VRRP is loaded onto the switch and is enabled. Virtual
routers must first be configured and enabled as described in the sections. Since VRRP is implemented on
multiple switches in the network, some VRRP parameters must be identical across switches:
VRRP and ACLs
•
If QoS filtering rules (Access Control Lists) are configured for Layer 3 traffic on a VRRP router, all of
the VRRP routers on the LAN must be configured with the same filtering rules; otherwise the security
of the network will be compromised. For more information about filtering, see
ing ACLs."
Conflicting VRRP Parameters Across Switches
•
All virtual routers with the same VRID on the LAN should be configured with the same advertisement
interval, IP addresses, and authentication password. If the virtual routers are configured differently, it
may result in more than one virtual router acting as the master router. This in turn would result in
duplicate IP and MAC address messages as well as multiple routers forwarding duplicate packets to the
virtual router MAC address. Use the
ters. For information about configuring VRRP parameters, see the remaining sections of this chapter.

Basic Virtual Router Configuration

At least two virtual routers must be configured on the LAN—a master router and a backup router. The
virtual router is identified by a number called the Virtual Router ID (VRID), the VLAN on which the
virtual router is configured, and the IP address or addresses associated with the router. Multiple virtual
routers may be configured on a single physical VRRP router.
Basic commands for setting up virtual routers include:
vrrp
vrrp ip
The next sections describe how to use these commands.

Creating a Virtual Router

To create a virtual router, enter the
VRID must be a unique number in the range from 1 to 7. The VLAN must already be created on the
switch through the vlan command. For information about creating VLANs, see
VLANs." For example:
-> vrrp 6 4
This command creates VRID 6 on VLAN 4.
When you create a new virtual router, the VRID ID and a VLAN ID are required. Optionally, you may
also specify:
Priority (in the range from 1 to 255); use the priority keyword with the desired value. The default is
•
100. Note that the IP address owner will be automatically assigned a value of 255 if you do not specify
the priority. See "Configuring Virtual Router Priority" on page 16-9
priority is used.
OmniSwitch 6624/6648 Network Configuration Guide
show vrrp statistics
vrrp command with the desired VRID and the relevant VLAN ID. The
April 2004
Configuration Overview
Chapter 22, "Configur-
command to check for conflicting parame-
Chapter 4, "Configuring
for more information about how
page 16-7