[42833] in North American Network Operators' Group
Re: looking for SLA examples
daemon@ATHENA.MIT.EDU (Alex Bligh)
Sun Sep 23 18:55:39 2001
Date: Sun, 23 Sep 2001 23:55:03 +0100
From: Alex Bligh <alex@alex.org.uk>
Reply-To: Alex Bligh <alex@alex.org.uk>
To: Tim Peiffer <peiffer@nts.umn.edu>, nanog@merit.edu
Cc: Alex Bligh <alex@alex.org.uk>
Message-ID: <786021545.1001289303@[195.224.237.69]>
In-Reply-To: <200109232015.PAA27668@nts.nts.umn.edu>
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--On Sunday, 23 September, 2001 3:15 PM -0500 Tim Peiffer
<peiffer@nts.umn.edu> wrote:
> some amount for router serialization and queuing delays
> (~5 msec/hop?)
5ms per hop? Assuming >=OC-12 backbone, that's way
excessive. At OC-12, a 1500 byte packet takes
20 microseconds to serialize. OK you will statistically
encounter a few queuing delays even on a near-idle
backbone (think about number of other
ingress interfaces), but again these should
be a few packets when the circuit is not
loaded. So 0.5ms per hop seems generous.
Remember that with cloak-of-indeterminacy technologies
such as ATM and MPLS, you may not be able to see many
of the hops.
--
Alex Bligh
Personal Capacity
