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N5k Jumbo frames just on few ports

Hello there,

How could I enable jumbo frames on Nexus5k just on few ports?

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1 ACCEPTED SOLUTION

Accepted Solutions
Cisco Employee

N5k Jumbo frames just on few ports

Yes, you can apply it to just one or group-of interface for Layer3 , instead of the "system qos" interface just use "interface ethx/y".

For L2, you cannot set the MTU per interface but only system wide. The mtu is set under network-qos which can only be attached to system qos.

Hope this helps.

-amit singh

5 REPLIES
Cisco Employee

N5k Jumbo frames just on few ports

Cisco Nexus devices support different MTUs per QoS group and we cannot represent the MTU
as an interface value.

You have to do it for the whole system.

switch(config)#policy-map type network-qos jumbo
switch(config-pmap-nq)#class type network-qos class-default
switch(config-pmap-c-nq)#mtu 9216
switch(config-pmap-c-nq)#exit
switch(config-pmap-nq)#exit
switch(config)#system qos
switch(config-sys-qos)#service-policy type network-qos jumbo

In order to check the MTU for an interface and a particular queue, you should use the
following command:

switch# show queuing interface ethernetX/Y

N5k Jumbo frames just on few ports

Hello Amit, thanks for your help, but I´d like to configure just 4 interfaces to allow jumbo frames. Is it possible?

I can´t enable jumbo on my whole system...

Could I create a QoS group and associate it just to these ports?

Cisco Employee

N5k Jumbo frames just on few ports

Yes, you can apply it to just one or group-of interface for Layer3 , instead of the "system qos" interface just use "interface ethx/y".

For L2, you cannot set the MTU per interface but only system wide. The mtu is set under network-qos which can only be attached to system qos.

Hope this helps.

-amit singh

N5k Jumbo frames just on few ports

Thank you so much Amit.

It totally answers my question.

Cisco Employee

N5k Jumbo frames just on few ports

No problem Andre. Glad I was of help. Appreciate your rating.

Please continue to use the Cisco support forums for support.

Cheers,

-amit singh

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