Hi, On Wed, Sep 21, 2016 at 02:40:43PM +0200, Robert Raszuk wrote: > > An implementation could easily do this in their route-policy language > > > > if ( community in ( MYAS:PEERAS:([1-9]) ) ) then > > set as-path prepend MYAS times $1 > > endif > > > > with "MYAS" and "PEERAS" properly pre-defined in route-policy context. > > Are you suggesting to embed the action (here prepend) into MYAS:PEERAS > fields ?
Well, the example was not ideal. The action would have to be part of the 3rd field, so the match would be more along the lines of if ( community in ( MYAS:PEERAS:1000([1-9]) ) ) then set as-path prepend MYAS times $1 endif if ( community in ( MYAS:PEERAS:20([0-9][0-9][0-9]) ) ) then set med $1 endif > Last part would be a parameter ... cool. This is what I've heard how people consider to use this, yes. > So if I need to also send different MED I would need yet one more magic > pair MYAS:PEERAS .... correct ? Well, since MYAS and PEERAS are the same for a given combination of "my AS" and "my peer AS", bits from the (vast!) 32 bit number space in field 3 would be needed. But the point is: this can be *signalled* using 32:32:32 just fine, and how easy it is to make policy statements out of this is a matter of flexibility of the vendors's route policy language. Gert Doering -- NetMaster -- have you enabled IPv6 on something today...? SpaceNet AG Vorstand: Sebastian v. Bomhard Joseph-Dollinger-Bogen 14 Aufsichtsratsvors.: A. Grundner-Culemann D-80807 Muenchen HRB: 136055 (AG Muenchen) Tel: +49 (0)89/32356-444 USt-IdNr.: DE813185279
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