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Extra resources for BGP Design
2- Updates originating from AS400 to be dropped. 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
Another type of filtering, is path filtering which is described in the next section. 0 You can specify an access list on both incoming and outgoing updates based on the BGP autonomous system paths information. 0 from going to AS100 by defining an access list on RTC that prevents any updates that have originated from AS 200 from being sent to AS100. To do this use the following statements. 2 filter-list 1 out (the 1 is the access list number below) 1. * In the above example, access-list 1 states: deny any updates with path information that start with 200 (^) and end with 200 ($).
2 Page 53 Sam Halabi-cisco Systems route-map stamp match as-path 1 set weight 20 ip as-path access-list 1 permit ^200$ Any updates that originate from AS200 have a path information that starts with 200 and ends with 200 and will be permitted. Any other updates will be dropped. Example 2: Assume that we want the following: 1- Updates originating from AS200 to be accepted with weight 20. 2- Updates originating from AS400 to be dropped. 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.