North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: VoIP QOS best practices
On Tue, 11 Feb 2003, Petri Helenius wrote: > > > > > Reordering per se doesn't affect VoIP at all since RTP has an inherent > > resync mechanism. > > Most VoIP implementations donīt care about storing out-of-order packets > because they think that 20ms or 30ms late packets should be thrown > away in any case. > > > > Reordering is also unlikely, since each packet is sent 20ms or more apart; > > I'm not aware of any network devices that reorder on that scale. > > > Most "core" routers, at least from vendors C and J have enough packet > memory to keep packets for hundreds of milliseconds. Apply sufficent Really.. including many Gigabit, OC-12,48 interfaces > per packet load balancing (which would be stupid but doable) to this, > and youīll arrive at the end result. And its unlikely you will be doing this therefore.. > > Our observations tell us that reordering does not happen too much but > there are periods from a few minutes to an hour where reordering from > specific ASīs skyrocket to return to normal, in many cases even without > observable path change. (MPLS in action?) > > Pete > >
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