Cisco 1000v MTU

[Daniel Moloney]

         Hi,

We are trying to setup Jumbo frames within a flexpod enviroment. Now we have configured the 7ks to have a MTU of 9216 but are unable to configure the Cisco 1000v to have the same MTU size (9216) as it has a maximum of 9000.

Is this a limitation of the 1000v, and if so will it be resolved in newer releases?

Thanks

[Reza Sharifi]

Hi,

The max MTU for Nexus 1000V is 9000

Q. Does the Cisco Nexus 1000V support jumbo frames?

A. Yes. The Cisco Nexus 1000V supports jumbo frames up to 9000 bytes, as long as the NIC supports them.

http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9902/qa_c67-556624.html

HTH

[Daniel Moloney]

Hi Reza,

Thanks for your reply. I understand that they support upto 9000 MTU.

The issue we are seeing is if we configure the MTU on the 1000v to 9000 and the MTU on the NFS vmkernel to 9000 when we run the following command from the host console:

vmkping -c 5 -d [ip address of filer] -s 9000

we get a response of:

sendto() failed (Message to long)

Now if we drop the size on the command:

vmkping -c 5 -d [ip address of filer] -s 8972

we get a successful respose.

Should we not be able to ping the filers at 9000?

[aanderson]

Some problem, anyone with an answer