On Tue, 29 May 2001, Stephen J. Wilcox wrote:
Although I generally agree, how does one keep QoS out of the core for CBR and jitter-sensitive applications?
I would disagree and argue that your core needs to be running top of the range routers with fat pipes with spare bandwidth, for a large network if you run out of CPU or bandwidth your routers will simply fall over.
If you have sufficient bandwidth and your routers are running smoothly then there is no use for QoS hence I wouldnt use it (plus it will slow down the routing process).
QoS isn't just about queueing algorithms and transmit reordering. QoS-triggered path selection (a la MPLS-TE, PBR) can be an equally compelling motivation, if the network is built for differentiated services (which most aren't today, since a packet is a packet is a packet). This would make most sense in the core, of course. Pete.