nanog mailing list archives

Re: TransAtlantic Cable Break


From: "Chris L. Morrow" <christopher.morrow () verizonbusiness com>
Date: Sun, 24 Jun 2007 15:27:40 +0000 (GMT)




On Sun, 24 Jun 2007, Robert Blayzor wrote:

However, if you put 15G down your "20G" path, you have no redundancy.
In a cut, dropping 5G on the floor, causing 33% packet loss is not
"up", it might as well be down.

I don't know if that's always true.  Case in point 802.17.  It runs
active-active in unprotected space.  While you have the extra bandwidth
and classes of service, a cut doesn't really mean you're hard down, it
all depends on the SLA's you provide to customers.  Of course anything
over the guaranteed bandwidth during failure would be classed only as
"best effort".

Then there's the interesting: "How do you classify 'to be dropped'
traffic?" Simon suggests nntp or BitTorrent could be put into a lower
class queue, I'm curious as to how you'd classify traffic which is
port-agile such as BitTorrent though. In theory that sounds like a grand
plan, in practice it isn't simple...


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