| 摘要 |
Redundant gateway methods, apparatus and systems use more than one gateway device in a gateway device group for communications directed outside of a LAN. Failover services in the event that an active router or other gateway device fails. In determining the priority of members of the group to become the active router/device for the group, a route metric is used as the priority value in elections held to determine the operating mode of each group member. This route metric is a numerical value representing the optimality of a route available between the router and a destination such as a remote network. By comparing the members' respective route metrics from time to time and in the event of a trigger event, the active router/device in a group is guaranteed to be the router with the optimal route to that remote network.
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