Re: IP namespace
Anders Karlsson <sak@cdg.chalmers.se> Thu, 14 May 1992 23:11 UTC
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From: Anders Karlsson <sak@cdg.chalmers.se>
Message-Id: <9205142142.AA12010@wilfer0.cdg.chalmers.se>
Subject: Re: IP namespace
To: osi-ds@cs.ucl.ac.uk
Date: Thu, 14 May 1992 23:42:48 -0000
Cc: huitema@mitsou.inria.fr
X-Mailer: ELM [version 2.3 PL11]
Christian Huitema writes: >This is in fact a case where you would like to use "longest match" >searches, i.e. select all possible entries in the database where >attribute X contains the "firs t bits" (yes, I said BIT, not octet) of >the target Y, then select the "longest X" and continue the search. >Similar searches would be absolutely needed for NSAP resolution. I have been playing around with the directory as a tool for registering NSAP's. With NSAP's I don't think there is the same need for a "longest match" search. The reason for this is that NSAP's (at least those we deal with) have a lot of "natural" points for delegation. Example: This NSAP ... 47002300000006000001000041460100000001 ... can be split up in its diffrent parts and put into directory like this: Back-translation root: @c=SE@o=Chalmers@cn=back-translation -- folowed by ... @bt=nsap -- with attributes ... btBits=8 registrationAuthority=Joint ISO/CCITT description=AFI @bt=47 btBits=16 registrationAuthority=ISO description=IDI @bt=0023 btBits=32 registrationAuthority=Nordunet description=8 bit Version + 24 bit Administrative Authority @bt=00000006 btBits=32 registrationAuthority=SUNET description=16 bit reserved + 16 bit routing domain @bt=00000100 btBits=16 registrationAuthority=Chalmers Networking Group description=Area @bt=0041 btBits=48 registrationAuthority=Chalmers Networking Group description=Open system identification number @bt=460100000001 description=Chalmers NIC This way our NSAP could be resolved with 7 read-operations that descend through the DIT. An other feature with not having the "longest match search" approach is that the descended path could be localy cached in a client to speedup future lookups. Anders Karlsson Chalmers Networking Group
- Re: IP namespace Thomas Johannsen
- Re: IP namespace Anders Karlsson
- Re: IP namespace Christian Huitema