North American Network Operators Group|
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Regular Expressions ......
Hi All, I am having a few problems getting my BGP filtering to work - and am experiencing some strange results.. I have two routers connected to a peering point, we have decided that we want to set local preferences of 110 to 1-deep AS-paths (as-path ACL 1) 100 to 2-deep AS-paths (as-path ACL 2) and 90 to 3-deep AS-paths (as-path ACL 3) and to not accept 4-deep AS-paths (as-path ACL 4) I have the following as-path ACLs to try to set that and am using route maps. ip as-path access-list 1 permit ^[0-9]*$ ip as-path access-list 2 permit ^[0-9]*_[0-9]*$ ip as-path access-list 3 permit ^[0-9]*_[0-9]*_[0-9]*$ ip as-path access-list 4 permit .* This appears to have failed miserably....It is not setting local prefs correctly if they are 3-deep and have a repetition of an AS number it sees it as 4-deep If they are 4 AS's deep it doesn't apply a local preference but if it knows it from our other core router it sets a local pref of 100 but prefers the direct route? (ALSO: If I do a sh ip bgp reg ^[0-9]*_[0-9]*$ it lists both 1-deep and 2-deep AS's....surely it should just list 2-deep?) Any help would be greatly appreciated!...... Thanks in advance.. Ally email - [email protected] ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. The views expressed in the email and files transmitted with it are those of the individual, not the company. If you have received this email in error please notify [email protected] +++++++++++++++++++++++++++++++++++++++++++++++++++++++++