rtconfig & aspath filter
Ruediger Volk, Deutsche Telekom NP - FMED51..
rv at NIC.DTAG.DE
Mon Aug 29 15:36:28 UTC 2011
Hi Are,
> Hi,
> I'm trying to get rtconfig to generate as path filters, but it wants to
> expand the AS into prefix lists.
> Is there any obvious ways to do this?
>
> I've tried both to use filter set and as set.
>
> example:
>
> import: from AS65009 action pref = 660;
> community.append(65009:19999); accept AS65008:AS-65009-PREFER
well, in RPSL syntax this means
accept prefixes matching the route-set you get by resolving
AS65008:AS-65009-PREFER
The concept that is offered by RPSL is filtering by AS path regular expressions;
and you can reference AS-sets within those regexps.
RPSL syntax requires the reg exps to be enclosed in <>;
note that the regexpsare NOT anchored.
So <AS65008:AS-65009-PREFER> matches all paths in which an AS from
AS65008:AS-65009-PREFER
... occurs (anywhere);
<^AS65008:AS-65009-PREFER> - ... is next hop AS
<AS65008:AS-65009-PREFER$> - ... is origin AS
> as-set: AS65008:AS-65009-PREFER
> descr: preferred AS
> members: AS1, AS2
>
> OR
>
> import: from AS65009 action pref = 660;
> community.append(65009:19999); accept FLTR-AS-65009-PREFER
>
>
> filter-set: FLTR-AS-65009-PREFER
> descr: preferred AS
> filter: AS1 OR AS2
same syntax and semantics apply here!
>
> R,
> -Are
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Ruediger Volk
Deutsche Telekom AG -- Internet Backbone Engineering
E-Mail: rv at NIC.DTAG.DE
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