Building the IP routing table - Adding IBGP Routes to the IP Routing table - Route Reflectors

6 important questions on Building the IP routing table - Adding IBGP Routes to the IP Routing table - Route Reflectors

What are the rules for RR (route reflectors) servers?

-Allowed it learn iBGP routes from their clients
-Advertise them to other iBGP peers

Are routes learned from a client  advertised by RR  server to non-clients?

Yes

What is a RR cluster and when does it make sense?

multiple RR's in a cluster
Makes only sense when physical redundancy exits
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What are the RR features to prevent loops?

-CLUSTER_LIST
-ORIGINATOR_ID
-Only advertise beste routes

What is the RR CLUSTER_LIST used for?

RR add cluster ID into BGP PA, called cluster list
RR discard recieved prefixes with their cluster ID (this prevents loops!)

What is the RR ORIGINATOR_ID used for?

-PA lists the RID of first iBGP peer to advertise the route into the AS
-If router sees its own BGP ID as the ORIGINATOR in recieved route, it does not use or propagate the route

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