Multiple conditions of different types are "AND". Multiple conditions
of the same type are coalesced into one line and are effectively "OR".
This means that constructing "AND" cases involving something like
communities and as-paths is easy, but trying to do "AND" cases of
two communities or two as-paths requires creating new access-lists
that enumerate all the allowable combinations.
Why route-maps are the way they are probably has to do with "easy"
extensions to the original model that are embedded in the code and/or
firmware that works "everywhere", a more general decision language
would probably be bugs-from-hell for the next n-releases.
George
> Date: Thu, 14 Dec 2000 19:04:48 +0800
> From: "Miguel A.L. Paraz" <map@internet.org.ph>
> To: cisco-nsp@puck.nether.net
> Subject: Re: Filter subnets
>
> In a private mail (thanks):
> > yes you can mark with communities or just match and deny any routes
> > _asnB_ out thru provider C?
>
> So, if the route matches the prefix list but fails the AS path, will it
> be sent? Are these "AND", or are they "OR" matching?
>
> Thanks.
>
> --
>
> http://www.internet.org.ph Internet and ISP's in the Philippines
> http://www.ASARproject.org Artists for Social Action and Response
>
> GSM Mobile: +63-917-8109728
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