BGP-Case-Studies

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2 Page 41 Sam Halabi-cisco Systems RTD are in AS300 and RTB is in AS400. Assume that we have set the metric coming from RTC to 120, the metric coming from RTD to 200 and the metric coming from RTB to 50. 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).

Let us study the above example. 0 from AS4 and will propagate the update to RTC. 0 from AS4 and will propagate it to RTC. 0 and has to decide which way to go. 0. 0 from RTB will have 100 *Routes with higher weight are preferred when multiple routes exist to the same destination. RTA will be preferred as the next hop. The same outcome can be achieved via ip as-path and filter lists. 2 remote-as 100 filter-list 5 weight 200 remote-as 200 filter-list 6 weight 100 ip as-path access-list 5 permit ^100$(this will only permit path 100) ip as-path access-list 6 permit ^200$ The same outcome as above can be achieved by using routmaps.

2 filter-list 3 in Note that in the above configs we have defined the remote-as statements outside of the peer group because we have to define different external ASs. 2 by assigning filter-list 3. 0 One of the main enhancements of BGP4 over BGP3 is CIDR (Classless Interdomain Routing). CIDR or supernetting is a new way of looking at IP addresses. There is no notion of classes anymore (class A, B or C). 0/16 where the 16 is the number of bits in the subnet mask counting from the far left of the IP address.

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