It is no need test...the as-path-accesslist of chunk is doing what you want.. it is no problem by my practise..
----- Original Message ----- From: "Julian Eccli" To: Sent: Monday, October 29, 2001 3:40 PM Subject: Re: Second opinion on Regular Expression [7:24460] > Chuck, > > You need to make the deny '^5555 .*'. Assuming you are putting this on an > EBGP router peering with AS5555. > > "ip as-path access-list 55 deny ^5555 .*" > > The '^' is an anchor in regex and forces a match at the beginning of the > input string you are comparing. IE: Whatever is after the '^' must start > at the beginning of the string being compared to match and make the > epxression true. > > To see if you are getting anything from AS5555 try: > > "show ip bgp regexp ^5555 .*" > > Good way to test your regexp as well. > > > -Julian > > ""Chuck Larrieu"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > 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 Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24476&t=24460 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
