A default gateway is a critical resource for connectivity. However, it's prone to a single point of failure. Thus, redundancy for the default gateway is required by the access point. If WAN backhaul is available, and a router failure occurs, then an access point should act as a router and forward traffic on to its WAN link.
Define an external VRRP (Virtual Router Redundancy Protocol) configuration when router redundancy is required in a wireless network requiring high availability.
The election of a VRRP master is central to the configuration of VRRP. A VRRP master (once elected) performs the following functions:
Nodes that lose the election process enter a backup state where they monitor the master for any failures. In case of a failure, one of the backups becomes the master and assumes the management of the designated virtual IPs. A backup does not respond to an ARP request, and discards packets destined for a virtual IP resource.
To define the configuration of a VRRP group:
| Virtual Router ID | A numerical index (from 1 - 255) used to differentiate VRRP configurations. The index is assigned when a VRRP configuration is initially defined. This ID identifies the virtual router for which a packet is reporting status. |
| Description | A description assigned to the VRRP configuration when it was either created or modified. The description is implemented to provide additional differentiation beyond the numerical virtual router ID. |
| Virtual IP Addresses | The virtual interface IP address used as the redundant gateway address for the virtual route. |
| Interface | The interfaces selected on the access point to supply VRRP redundancy failover support. |
| Priority | A numerical value (from 1 - 254) used for the virtual router master election process. The higher the numerical value, the higher the priority in the election process. |
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