Implementation of RIPE-181++

Currently, in the 81++ document, thought it is not written explicitly, it 
implies that if one does not list certain AS or nets in as-in/out, it means 
the opposite policy of what mentioned.
For example, if AS1 has the policy of

as-in: from AS100 1 accept AS690 AS200
means from AS100 it will only accept AS690 and AS200 and NOT rest of the ASs.

as-in: from AS300 1 accept NOT (AS301 AS302)
means from AS300, it will accept ANY ASs except AS301 and AS302.

Same rule can not be applied to interas-in/out since according to the rule
of interaction between the two set, interas-in will also accept whatever
the difference between the as-in and the union of the interas-ins.  This
means that if an AS has the policy of NOT accepting a particular AS or routes
at a particular connection, its interas-in has to always explicitly list the 
NOT's.

as-in: from AS100 1 accept AS690 AS200
interas-in: from AS100 L1 R1 (pref=1) accept NOT AS200
(he can not say here 'interas-in: from AS100 L1 R1 (pref=1) accept AS690' and 
expect it implies NOT accept AS200) 
interas-in: from AS100 L1 R1 (pref=1) accept AS690 AS200
 
That is, one can not expect the same as what him gets from as-in where if he
list what to accept then he does not need to list what he does not want to 
accept.  This needs to be explained in the document. 

						--Jessica



-------- Logged at  Tue Oct 4 21:25:22 MET 1994  ---------