23 Sep
2001
23 Sep
'01
6:55 p.m.
--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