The only difference between a traditional VRRP implementation and the Px series application switch implementation is that instead of using the VRRP MAC address for a single layer 3 router address, the Px series application switch uses the VRRP MAC address for all VIPs configured in the system. Whenever the VRRP state changes, all VIPs either start accepting traffic and making forwarding decisions, or stop doing so.
For VRRP to work, there must be a layer 2 adjacency between the application switches. Each of the VLANs that are configured on the primary Px series application switch and its adjacent layer 3 switch must be configured on the standby Px series application switch and standby layer 3 switch. Additionally, depending on the configuration of the application switch, the layer 3 switch needs some special configuration. This manual assumes the layer 3 switch is running ExtremeWare.
Before configuring VRRP, make the following decisions:
•Select which system should initially be primary and which should be secondary. Configure the secondary switch with a lower priority.
•Assign a virtual router ID (VRID), which must be the same on both systems. If VRRP is being used by other devices on the same network, it is important to make sure that the VRID is unique.
•Set a priority for each application switch.
•Decide whether to preempt or not preempt. If a transition occurs because the primary (highest priority) device goes down, do you want it to take over from the standby when it comes back up? This can cause unneeded network interruptions.
Adding and Configuring VRRPs
The highest priority device is selected as the primary. Priorities are in the range
config vrrp vrid <number> priority <number>
To configure a VRRP to be the initial primary, use the following commands:
config vrrp add vrid <number>
config vrrp vrid <number> priority 255
enable vrrp
build
Give backup systems lower priorities:
Px Series Application Switch Installation and Configuration Guide |