QOS-ios 12.2

[nkhwaja]

6509(12.2(17d)SXB10)-->4500(12.2.25SG)

I am planning to use vlan-based-qos.

-Several VLANs are defined at 6509 and trunked to 4500. To use, vlan-based-qos, is it enough to define qos-vlan at vlan interfaces at 6509 only.

Do i have to define one interface for each vlan at 4500 ? At present only one interface (VLAN1) with IP address is configured on 4500 though ports belong to different Vlans.

[mheusinger]

Hi,

generally QoS has to be applied where there can be a lack of resources. In your case this can be f.e. trunk and access ports. The question is what you want to achieve where. In case you want a VLAN based policer you need a vlan interface to apply the policy to. For queueing you can apply per port or per switch settings, so no VLAN interfaces nessessary.

Hope this helps

Martin

[nkhwaja]

Hi,

Thanks for the reply. I want to apply Vlan-based QOS on 4500 access/trunk ports. VLAN interfaces are defined at 6509 but not at 4500. Question is: Do I have to define an interface for each VLAN at 4500 for vlan-based qos at 4500?? or command 'qos vlan-based' at 6509-vlan interface is enough ?

[mheusinger · Accepted solution]

Hi,

In case you want to apply a service policy per VLAN in the 4500 you would need a VLAN interface.

QoS according to the DiffServ frame-work, which you will be using is a LOCAL treatment of traffic called per-hop-behaviour. The Catalyst 4500 will not "know" what or whether qos is configured on the 6500.

Hope this helps

Martin

[nkhwaja]

Perfect answer ! Thank you, that answered my question.