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Route Redistribution: Connecting Different Routing Protocols

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Route redistribution: where routing protocols meet

Enterprise networks often run multiple routing protocols — OSPF inside the campus, eBGP toward ISPs, static routes for specific paths. Route redistribution is the mechanism for moving routes learned by one protocol into another.

The core challenge: different protocols have different metrics (OSPF uses cost, BGP uses path attributes, RIP uses hop count) and different trust levels. The router needs rules to decide which source wins when multiple protocols know the same prefix — that's administrative distance.

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