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End stations are often configured with a static default gateway IP address. Loss of the default gateway router can have catastrophic results. The Virtual Router Redundancy Protocol (VRRP) is designed to eliminate this single point of failure in a routed environment by introducing the concept of a virtual IP address (transparent to users) shared between two or more routers connecting the common subnet to the enterprise network. With the virtual IP address as the default gateway on end hosts, VRRP provides a dynamic default gateway redundancy in the event of a failure.
In Passport version-A hardware (ARU2 ASICs), four VRRP interfaces (isolated routing ports and VLANs) are allowed per switch and all virtual router IDs (VRIDs) must be unique. In version-B hardware, you can configure a maximum of 255 VRIDs.
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