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TCP/IP Guide by Charles M. Kozierok

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BGP Route Determination and the BGP Decision Process

You have now looked at the fundamentals of how BGP devices store and manage information about routes to networks. This included an overview of the four route information management activities performed by BGP speakers: route storage, update, selection, and advertisement. Route storage is the function of the RIB in each BGP speaker. Path attributes are the mechanism by which BGP stores details about routes and also describes those details to BGP peers.

BGP Decision Process Phases

As you have seen, the RIB also contains sections for holding input information received from BGP peers and for holding output information that each BGP device wants to send to those peers. The functions of route update, ...

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