Hi Scott, Regarding my suggested terminology, you wrote in the thread "Thoughts on the RRG/Routing Space Problem" (msg 713):
>> The MAB, UAB and micronet terminology I use here is discussed >> in: http://psg.com/lists/rrg/2007/msg00533.html >> http://psg.com/lists/rrg/2007/msg00535.html > > iirc a MAB is an aggregate of addresses that are not globally > routed, "Mapped Address Blocks" are not globally routed (advertised in BGP) in eFIT-APT or the original conception of LISP, but they are in Ivip and for whichever MABs are handled by LISP Proxy Tunnel Routers. > a "micronet" is a chunk of addresses within that, which need not > be on a power-of-2 boundary, and a UAB is somewhere in the > middle. Yes. A User Address Block is a range of addresses one end-user controls the mapping of. They can configure this as one micronet or as many micronets as they like, subject to the technical restrictions of the ITR-ETR scheme (AKA map&encap scheme). For MAB, I think it's just as easy to say what you mean. By all means do so. I think it is a common enough concept in all these ITR-ETR schemes that it deserves a term which saves space and can clearly be seen as meaning one thing. The troubles with people making up a phrase to describe something in their own way, such as: ... prefix which is not routed and for which the mapping database has entries ... ... address block which is excised from the DFZ and for which ITRs tunnel packets when addressed thereto ... ... prefix which is advertised by all ITRs and for which the mapping database controls the ITR's encapsulation of packets whose destination addresses fall within this prefix ... etc. is firstly that it is tedious and wordy, and secondly that there is a high risk that even specialists in this field won't understand that all three phrases above refer to the same thing, with the exception that the MAB described in the third one is advertised and the first two are not. Hopefully other people will find MAB and the other terms useful, or suggest some alternatives. I believe we do need some common terminology to make our discussions understandable, even to ourselves - let alone hapless newcomers to this difficult field. I am keen to keep the definitions wide enough to not constrain the technical details of each ITR-ETR / map&encaps scheme, while still making the terms useful. > For "UAB" and "micronet", we have tried non-power-of-2 alignment > in the past and it has been a big problem. We ended up with CIDR > on power-of-2 boundaries for a good reason. That's fine, but Ivip is intended to have arbitrary boundaries and lengths regarding the UAB and micronet, so I don't want to use terminology which assumes power-of-2 boundaries. > The term for a chunk of addresses aligned on a power-of-2 boundary > is a prefix. We've been using this for over 20 years. That's fine, but I can't use this for Ivip's UAB or micronet concepts. If you use the term "prefix", you have to attach further words to describe exactly what sort of prefix you mean, which raises the problems of multiple complex and confusing ways of describing the same things. > Finally, the labels "M" and "U" unnecessarily assume a simple > two-tier system. Still, I think they are useful. Others may find them useful too. If a scheme uses a more complex hierarchy of address divisions, then the terms won't work for that, and new terms or phrases should be used. - Robin -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
