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Note Loopback interfaces are rarely used between EBGP peers because EBGP peers are usually directly connected and, therefore, depend on a particular physical interface for connectivity. External BGP (EBGP) When two BGP speakers that are not in the same AS run BGP to exchange routing information, they are said to be running EBGP. Synchronization When an AS provides transit service to other ASs when there are non-BGP routers in the AS, transit traffic might be dropped if the intermediate non-BGP routers have not learned routes for that traffic via an IGP.

Route-map check-community permit 10 match community 1 set weight 20 ! route-map check-community permit 20 match community 2 exact set weight 10 ! route-map check-community permit 30 match community 3 ! ip community-list 1 permit 100 ip community-list 2 permit 200 ip community-list 3 permit internet In the preceding configuration, any route that has 100 in its community attribute matches community list 1 and has its weight set to 20. Any route whose community attribute is only 200 (by virtue of the exact keyword) matches community list 2 and has its weight set to 10.

2 remote-as 100 weight 2000 remote-as 200 weight 1000 This configuration sets the weight of all route updates from AS 100 to 2000, and the weight of all route updates coming from AS 200 to 1000. The higher weight assigned to route updates from AS 100 causes Router C to send traffic through Router A. Local Preference Attribute When there are multiple paths to the same destination, the local preference attribute indicates the preferred path. The path with the higher preference is preferred (the default value of the local preference attribute is 100).

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