On 28-Feb-2008, at 01:56, Paul Wall wrote:
> UU/MFS tried running IP on the 'protect' path of their
SONET rings
> 10 years ago. It didn't work then.
Well, it works so long as whoever was trying to troubleshoot
the
circuits at 3am on US Thanksgiving understands that having
the system
"switch to protect" is quite bad, in the sense
that it causes both
sides to go down at once (I seem to remember there was a
protect paths
built for each side of the original ring using a loopback).
Other than the unfamiliarity with the concept demonstrated
by phone
companies, I didn't notice any great fundamental problem
with the
idea. The extra 10G of capacity across the Atlantic was
arguably more
useful in the grand scheme of things than the being able to
recover
from a single-point failure at SONET speeds. It's probably
fair to say
there's more real-time traffic on the network today than
there was
then, however.
I have never worked for UU/MFS, lest anybody draw that
conclusion.
Joe
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