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Software can learn several routes to a given destination network through several protocols. If the alternate route is enabled, it stores all of these routes sorted in order of preference/cost. The best route according to the preference/cost is used for the data forwarding. The remaining routes are referred to as alternate routes.
To avoid traffic interruption, the alternative-route feature can be enabled globally to replace best routes with the next-best route if the best route becomes unavailable. The alternate route concept is applied between routing protocols; for example if an OSPF route becomes unavailable and an alternate RIP route is available it is immediately activated without waiting for an update interval to expire.For more information about alternative routes, see Networking Concepts for the Passport 8000 Series Switch.
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