Service provider provides QoS

[wfqk]

Hi, I am not clear about the below stating: 

"service provider will provide four/one classes of traffic."

I think it means when the traffic go through WAN cloud, the marker in the traffic keep unchanged from ingress to egress the WAN cloud. I am all right? Is that all about it? Thank you

[Reza Sharifi]

Hi,

I am not sure what that statement means. Service providers don't configure QoS on their site. Only the customers do, if they need to. Who is the provider and what are they providing you?

HTH

[wfqk]

That is technical document statement, which does not mean specific service provider. It is general concept. 

 https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Education/CCVE/CCVE_DG/CCVE_Ch4.html

---- "Service providers don't configure QoS on their site"

If provider do not configure any Qos for the traffic, when two campus network connect to each other through WAN(provider), can we say all mark in traffic would be lost? 

[Reza Sharifi]

That is correct. The service provider's usually don't match any layer-2 marking you configure on your site.

HTH

[wfqk]

Do you mean service provider do not match any layer2 mark, or they do not affect any layer2 Qos configuration, but they can configure and affect layer 3 mark or Qos? 

[Joseph W. Doherty]

Some WAN providers do support QoS. This if often found in MPLS and/or MetroE based networks.

Such providers may support some fixed number of QoS models, some allow some customization.

Often such models only support four QoS classes, some support more, though.

Specifics, again, depend on the service provider.

[wfqk]

I think since it is end to end network. All devices should have the same Qos configuration including ISP. but they might use different mark system. so for enterprise network, it should change the mark system in its edge devices that are connected to ISP(WAN) in order to be consistent with ISP. Do you think so? Thank you

[Joseph W. Doherty]

That would be nice, but often not possible working with service providers. If not, you do the best you can with marking within the provider's QoS framework, and then remark when traffic reenters your network.