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metarouting [Re: [RRG] recent progress in routing research]
Again on the list to stimulate discussion...
On Sat, 20 Aug 2005, Dmitri Krioukov wrote:
3. Finally, I'd like to point out that importance of the research
direction established in the breakthrough metarouting paper
hardly be overestimated.
I'm not sure how useful the work will be in practice, as
implementation of these metalanguages, algebras and the necessary
abstraction layers for the routing protocols might be more work than
it is worth, but maybe there will be applications on this.
However, one detail disturbed me. In section 5, BGP modelling states
"The _med_ attribute (..) is used to implement cold potato routing.
In order to avoid the notorious problems of this attribute [18, 26],
we model _med_ as if this attribute is always compared, no matter what
the next hop ASN". That may be true, but that is hand-waving and
misses the point. The point for this paper (IMHO) in my opinion
should be to prove that it can express the same things that BGP can
do. That includes the current MED behaviour that exists today, even
though it can cause undeterministic scenarios. This approach makes
one wonder whether it is even possible to represent the real MED
behaviour with RAML (without significant amount of extensions -- and
the length and complexity of these extensions might give an idea of
the practical usefulness and representative power of the language).
Pekka Savola "You each name yourselves king, yet the
Netcore Oy kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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