[afnog] QoS/TE

[Phil Regnauld]

On Wed, Jan 18, 2006 at 08:57:08PM +0000, Brian Candler wrote:
> FWIW, I know a large UK ISP which *has* deployed QoS in the core -
> specifically, low-latency queuing with MPLS. It's a simple model, where
> there are low-latency queues for delay-sensitive applications like VoIP,
> and then there's everything else.

	Simple is the keyword.  Prioritizing VoIP and nothing else is a good
	approach.  I've seen networks where people went overboard trying to
	classify *everything*.

> So if you have a network link with moderate utilisation (say 50%)
> and a relatively low proportion of high-priority traffic (say 20%
> of that), the performance for the high priority traffic can be made
> noticeably better.

	Good point.  Traffic bursts alone will do that (not to mention worms
	spreading...).

> There's another reason for implementing QoS in the core, and that's
> purely as a marketing gimmick. Some customers will associate "quality
> of service" with "good quality service", or at least recognise it as a
> technical buzzword which your competitor doesn't have. If rolling out
> QoS means more people paying you money, then hey, why not :-)

	:)