BGP Design

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Given that by default a router compares metrics coming from neighbors in the same AS, RTA can only compare the metric coming from RTC to the metric coming from RTD and will pick RTC as the best next hop because 120 is less than 200. When RTA gets an update from RTB with metric 50, he can not compare it to 120 because RTC and RTB are in different ASs (RTA has to choose based on some other attributes). In order to force RTA to compare the metrics we have to add bgp always-compare-med to RTA. 4 route-map setmetricout out route-map setmetricout permit 10 set metric 50 With the above configs, RTA will pick RTC as next hop, considering all other attributes are the same.

Assuming that all other attributes are the same, AS600 will pick the shortest path and will choose the route via AS100. AS300 will be getting all its traffic via AS100. If we want to influence this decision from the AS300 end we can make the path through AS100 look like it is longer than the path going through AS400. We can do this by prepending autonomous system numbers to the existing path info advertised to AS100. 0 via AS100 with a path information of: (100, 300, 300, 300) which is longer than (400, 200, 300) received from AS100.

0 If the common media as you see in the shaded area above is a frame relay or any NBMA cloud then the exact behavior will occur as if we were connected via ethernet. 3. The problem is that RTA does not have a direct PVC to RTD, and cannot reach the next hop. In this case routing will fail. In order to remedy this situation a command called NextHopself is created. 3 Next-hop-self Because of certain situations with the nexthop as we saw in the previous example, a command called next-hop-self is created.

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