December 2001
Intermediate to advanced
608 pages
25h 14m
English
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Name
ip as-path access-list — global
Synopsis
ip as-path access-listaccess-list{permit | deny}as-regexno ip as-path access-listaccess-list{permit | deny}as-regex
Configures
A BGP access list
Default
None
Description
This command allows you to build an access list for BGP autonomous
system (AS) paths. These lists can be applied to a neighbor with the
filter-list option to the
neighbor command.
access-list is a number that identifies
the list; as-regex is a regular expression
that matches AS paths. For more information on valid regular
expressions for BGP, see Chapter 10.
Example
The following commands create an AS-path access list that denies (blocks) routes that include AS 111. This access list is then applied to routes that are sent to the BGP neighbor 11.1.1.1.
ip as-path access-list 1 deny _111_ router bgp 120 network 10.1.0.0 neighbor 11.1.1.1 remote-as 200 neighbor 11.1.1.1 filter-list 1 out
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.