My problem is when I try set the mtu of a class, I get the error in the title. A simple recreation is here:
(config)# class-map type network-qos JumboTest
(config-cmap-nq)# match qos-group 5
(config)# Policy-map type network-qos JumboTestPolicy
(config-pmap-nq)# class type network-qos JumboTest
(config-pmap-nq-c)# mtu 9000
ERROR: network-qos: MTU value different from class-default
I am fairly new getting this deeply into the switching environment. I assume I am overlooking something simple. I need to set the MTU on 2 of several VLANs on this switch. All the cisco docs seem to set the mtu at class-default but I wasn't planning to enable jumbo frames for the rest of my traffic (side question: is there really any harm there? I seem to find conflicting answers as to whether my network will explode if I just allow 9216 across my switches or not)
Re: ERROR: network-qos: MTU value different from class-default
As far as I know, the Nexus 3k supports MTU as a default setting for all the ports, not for individual ports.
Define it in the class-default.
3k(config)# class-map type network-qos jumbo 3k(config-cmap-nq)# match qos-group 1 3k(config-cmap-nq)# exit 3k(config)# policy-map type network-qos jumbo 3k(config-pmap-nq)# class type network-qos class-default 3k(config-pmap-nq-c)# mtu 9126 Warning: This platform only supports class class-default configured MTU across all classes. 3k(config-pmap-nq-c)# system qos 3k(config-sys-qos)# service-policy type network-qos jumbo 3k(config-sys-qos)# end
and check it with: show queuing interface ethernet 1/13
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