[c-nsp] traffic shaping inbound wan?

[Mikael Abrahamsson]

On Fri, 13 Jan 2006, Oliver Boehmer (oboehmer) wrote:

> i.e. when the access speed is higher than the subscriber speed, right.

Yes.

> Not sure if this is a chicken & egg thing, but isn't the QoS/business
> model in this case "Dear Mr. Customer, you can send me 20 Mbit over this
> 100Mbit connection, and I'll drop the egress, possibly taking some peak
> into account. If you need some preferred treatment for certain traffic
> (which is more than a policer, even a color-aware policer is able to
> provide), you need to do this at your side.".

Nope, I don't agree at all. The customer rarely has the possibility to do 
queueing as they most likely will have L2/3 switches or something like 
that.

> "shaping" or "policing"?

Policing doesn't work well for TCP based traffic in real life. One doesn't 
need to do 600ms shaping, but I'd at least like to do 25ms of shaping, 
that should satisfy most customers.

> define "working"

As in "up" and moving at least some traffic.

> Hmm, not sure I follow. You say "don't want to buy L3 CPE" and "want to 
> have something managable on their prem" in the same paragraph? This 
> "something" could do the queuing.. did I miss the point?

Not if it's a simple fiber media converter for up to 100 meg access.

Let me paint you a scenario:

customer lan - media converter - fiber - media converter - switch - Cisco 7304.

(everything is ethernet, either 100M or gige). We can manage the media 
converter (read error counters etc) from the CO media converter, they have 
some specialised management protocol between them.

Now I want to sell QoS 30M service, fully managed and us doing all the 
intelligent stuff. Either I buy a Cisco 2800 and put somewhere in the 
path, doing outgoing shaping for the intelligence, or I could try to 
accomplish the same thing with ingress policing on the 7304.

The business case for me would be better if I didnt have to put a cisco 
2800 anywhere in the path, but instead pay extra for the 7304 to do 
ingress shaping, or of course, pay nothing extra at all and still have the 
7304 do ingress shaping, even if it meant doing one more PXF round.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se