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From: Naidu, Venkata (Venkata.Naidu_at_MARCONI.COM)
Date: Wed Oct 02 2002 - 09:22:13 CDT
-> This is why the original IS-IS design was limited to 6 bit
-> metrics. But
-> times have changed. Processors are orders of magnitude
-> faster, and nobody
-> builds REALLY big networks (areas), so there is really no
-> advantage in the
-> optimization, and people like using wide metric ranges.
Addition to what mike said - using wide metrics became
necessity. Times have changed - today, links over which
traditional routing protocols can run ranges from DCs to OCxxx.
So the representation of link characteristics in a limited
space [0, 2^6] is unreasonable. RIP suffered a lot because
of its metric size (of course that was the tradeoff between
how fast RIP can reach the infinity vs how well link can be
represented etc etc).