North American Network Operators Group|
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RE: QOS or more bandwidth
TE isn't just for congestion avoidance/mitigation. It's also for choosing the best path, based on the costs and characteristics of the traffic, as well as the load on the network. So delay-intolerant (voice, video) traffic gets preference on the lowest latency path, and pushes delay-tolerant flows to alternate higher-latency (possibly longer) unused paths. MPLS constraint-based routing allows this, as does ATM. PBR w/ IP routing would be extremely complicated to do this. Same rules can be applied to homogeneous traffic, where I can manage at a finer granularity than per-desination-CIDR-block. I can move traffic around my network internally as well as to peers, to get full utilization out of my network without introducing congestion. This presumes a network with multiple paths to a given destination, with approximately equal performance and cost. Pete. On Tue, 29 May 2001, Ukyo Kuonji wrote: > How is TE part of QoS? Maybe we are talking a different > type of TE. To me, TE is the part that the traffic > takes, not really what queue it sits in to transmit. > > I could see a arguement for QoS being part of TE, but... > (Assuming that you TE your netword so there is no > conjestion.) > > --- Original Message --- > > Everything that you said is correct. However, you missed one > important part of QoS, which is TE. TE is about avoiding congestion > in the first place by more efficiently using all of the bandwidth > you already have in the network. To that extent, it is a substitute > for adding more pipe.