Modification of RIPE-181's as-in/as-out attributes
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Steven J. Richardson
sjr at merit.edu
Fri Oct 27 20:35:45 CET 1995
Actually, I'd like to even extend this further; it would be wonderful to have the "<aut-num>" of both the "as-in" and "as-out" attributes become an expression--called, say, "<as-list expression>"--more like the "<routing policy expression>" which appears later in these attributes. Whereas the <routing policy expression> evaluates to "a list of one or more ASes, AS Macros, Communities, Route Lists," the <as-list expression> would evaluate to one or more ASs, and would allow the Boolean operators which can be used in the <routing policy expression>. This is particularly usefule for customers of rps/RIPE-181 who wish to express their policy in the easiest manner--e.g., with NOT, one can specify the set one does _not_ want, as well as the set one wants, and there are a lot of cases where the use of NOT (ASxx ) would be very helpful. If the <aut-num> -> <as-list> transition makes sense, I think we should wrap the addition of the Boolean operators into this, as well, so that there is a nice, complete syntax for this element of the as-in/as-out attributes (or their equivalent), rather than a "half-baked" version. How does this sound? Steve R. == >Date: Tue, 24 Oct 1995 16:11:59 -0400 >From: "Steven J. Richardson" <sjr at merit.edu> >Message-Id: <199510242011.QAA26472 at home.merit.edu> >To: rps at isi.edu >Subject: Modification of RIPE-181's as-in/as-out attributes >Cc: db-wg at ripe.net, sjr at home.merit.edu >Status: RO > >In the process of reviewing RIPE-181-represented policies, I've >noticed an opportunity for what I think would be a useful >modification of the as-in/as-out attributes of the aut-num >object. > >Currently, the syntax for these attributes is given as: > > as-in: from <aut-num> <cost> accept <routing policy expression> > > as-out: to <aut-num> announce <routing policy expression> > >I see policies which would be usefully condensed via allowing >the <aut-num> to be an AS *macro*, too. > >E.g.: > >aut-num: 99999 >as-name: SOMEAS >... >as-in: from AS10 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS20 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS30 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS40 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS50 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS60 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS70 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS110 150 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS120 150 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS130 150 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS140 150 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS150 150 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS160 150 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS170 150 accept ANY AND NOT {0.0.0.0/0} > > >could be equivalent to: > >aut-num: 99999 >... >as-in: from AS-SOMEAS-100-NO-DEFAULT 100 accept ANY AND NOT {0.0.0.0/0} >as-in: from AS-SOMEAS-150-NO-DEFAULT 150 accept ANY AND NOT {0.0.0.0/0} > > >with the macro definitions: > >as-macro: AS-SOMEAS-100-NO-DEFAULT >descr: ASs which AS-99999 accepts at pref. 100 (any but >descr: the default route) >as-list: AS110 AS120 AS130 AS140 AS150 AS160 AS170 >... > >as-macro: AS-SOMEAS-150-NO-DEFAULT >descr: ASs which AS-99999 accepts at pref. 150 (any but >descr: the default route) >as-list: AS10 AS20 AS30 AS40 AS50 AS60 AS70 >... > >(The same could be said of as-out lines.) > >What do you think? > > >Steve Richardson/Merit
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