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Nexus 7K mtu - interface mtu or policy-map type network

peterbe
Beginner
Beginner

We currently have the interfaces configured with 'mtu 9216'. Now we are adding a policy-map type network for the data and iSCSI classes.  Where do we set mtu - see example

interface e8/1

mtu 9216  << with this set, do we need to specify mtu in the policy-map?

policy-map type network-qos CONVERGED-DATA-ISCSI-NQ

    class type network-qos C-NQ-DATA-DROP

      congestion-control tail-drop

      mtu 9216  <<  Is this needed

    class type network-qos C-NQ-ISCSI-NODROP

      pause

      mtu 9216  <<  Is this needed

Is one method of setting mtu prefered over the other?

thanks

Peter

2 REPLIES 2

Reza Sharifi
Hall of Fame Expert Hall of Fame Expert
Hall of Fame Expert

You don't need a policy-map to set the mtu, just the mtu command:

mtu 9216

verify with sh int ex/xx

HTH

Thanks Reza.

I configured:

  policy-map type network-qos CONVERGED-DATA-ISCSI-NQ

    class type network-qos C-NQ-DATA-DROP

      congestion-control tail-drop

    class type network-qos C-NQ-ISCSI-NODROP

      pause

But a show:

sh policy-map type network-qos CONVERGED-DATA-ISCSI-NQ

  Type network-qos policy-maps

  ============================

  policy-map type network-qos CONVERGED-DATA-ISCSI-NQ

    class type network-qos C-NQ-DATA-DROP

      congestion-control tail-drop

      mtu 1500

    class type network-qos C-NQ-ISCSI-NODROP

      pause

      mtu1500

So configuring the policy-map defaults mtu to 1500 if you don't specify a specific mtu.

What takes preference, the policy-map mtu or interface mtu?

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