I'll save ya the trouble John: http://www.cisco.com/univercd/cc/td/doc/product/atm/c8540/12_0/13_19/cmd_ref/appc.htm
Dave John Neiberger wrote: > > You are correct. The ^ character symbolizes the beginning of the AS > path so you're as-path access list looks like it should work exactly as > you think. I'm not aware of the ^ having any other meaning in this > context. I used to have a link on regular expressions but I can't seem > to find it. If I come across it I'll post it to the list. > > John > > >>> "Chuck Larrieu" 10/28/01 10:00:53 PM >>> > for an as-path filter, here is what I want to accomplish: > > from one particular router to another particular router I want to > filter any > AS path whose most recent AS was 5555 > > so if the BGP route has a path in the BGP table as 5555 1111 4444 ? or > 5555 > 9999 ? etc > then I want that route to be filtered to a particular neighbor > > routes such as 3333 5555 ? or 7777 2222 5555 3333, for example are OK > to > pass > > my access-list is: > > ip as-path access-list 55 deny ^5555_ > ip as-path access-list 55 permit .* > ! > and my neighbor statement is neighbor a.b.c.d filter-list 55 out > > does the ^ character really mean what I think it is supposed to mean? > I.e > does it filter any AS path that BEGINS with 5555, or is it doing > something > unexpected? > > I have a complex mesh ( mess too ;-> ) of BGP neighbors, and it is a > bit > hard to tell if I am accomplishing what I think I am accomplishing. > > thanks. > > Chuck -- David Madland Sr. Network Engineer CCIE# 2016 Qwest Communications Int. Inc. [EMAIL PROTECTED] 612-664-3367 "Emotion should reflect reason not guide it" Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24544&t=24460 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
