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Configuration Overview Configuring VRRP
page 19-8 OmniSwitch 6600 Family Network Configuration Guide April 2006
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 Chapter 25, “Configur-
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 and IP addresses. 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 show vrrp statistics command to check for conflicting parameters. 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 vrrp command with the desired VRID and the relevant VLAN ID. 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 Chapter 4, “Configuring
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 19-10 for more information about how
priority is used.