Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.


QOS 4500

Is there any way to do QOS on a 4500 with a supII+ that is setup as a layer 2 device only ? Or is the only way to turn ip routing on the box . Devices like the 2960 do it , the 4500 can't ? I have read the 4500 qos docs but don't see anything for a 4500 with no routing.


Re: QOS 4500

The SupII+ is an IOS only sup and it looks like the latest support is 12.1(19)EW1. Here is a config guide on QoS and I do not see any requirement about enabling routing.

Hope that helps.


Re: QOS 4500

We tried to configure it on a layer 4500 and it rejected it . Upon further investigation

from the qos doc we see this . We got the same error message from the switch when we tried to do this. We are running like 12.2.37Sg I think .

Note You cannot enable marking commands on an interface until IP routing is enabled globally. If IP routing is disabled globally and you try to configure the service policy on an interface, the configuration is accepted but it does not take effect. You are prompted with the message: "Set command will not take effect since CEF is disabled. Please enable IP routing and CEF globally.. " To enable IP routing globally, issue the ip routing and ip cef global configuration commands. After you do this, the marking commands take effect.

Hall of Fame Super Silver

Re: QOS 4500

Hello Glen,

the note says that multilayer action starts only when you enable ip routing as a way to start CEF.

Before it behaves as a L2 switch only and uses only CAM table.

Modular QoS requires CEF enabled also on routers, so this last part is not a surprise (I mean that CEF needs to be enabled)

Best Regards


CreatePlease login to create content