BGP-Case-Studies

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3- Other updates to have a weight of 10. * The above statement will set a weight of 20 for updates that are local to AS200, and will set a weight of 10 for updates that are behind AS400 and will drop updates coming from AS400. 1 Use of set as-path prepend In some situations we are forced to manipulate the path information in order to manipulate the BGP decision process. The command that is used with a route map is: set as-path prepend ... 0 to two different ASs: AS100 and AS200.

Note that we could only override options that affect inbound updates. Now, let us look at how we can use peer groups with external neighbors. In the same diagram we will configure RTC with a peer-group externalmap and we will apply it to external neighbors. 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).

2 Page 61 Sam Halabi-cisco Systems Solution 2: In addition to the static route we add an entry for the network command, this will have the same effect except that the origin of the update will be set to IGP. 3 CIDR example 2 (as-set) AS-SETS are used in aggregation to reduce the size of the path information by listing the AS number only once, regardless of how many times it may have appeared in multiple paths that were aggregated. The as-set aggregate command is used in situations were aggregation of information causes loss of information regarding the path attribute.

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