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Route Tags

A route tag is a field in a RIP message that allows boundary routers in an autonomous system (AS) to exchange information about external routes. Route tags provide a method of separating internal RIP routes (routes within the RIP routing domain) from external RIP routes, which may have been imported from an EGP (exterior gateway protocol) or another IGP (interior gateway protocol).

Routers supporting protocols other than RIP should be configurable to allow the route tags to be configured for routes imported from different sources. For example, routes imported from BGP should be able to have their route tags set to the number of the ASs from which the routes were learned.

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