Nexus 3000 Series MTU on one Port only

[dkafrissen]

Hi

I rarely work on our Nexus 3000 series switches, I've been here four years and with the panini I haven't touched them in two years (by the Config backup date at least).

Anyway, my boss wants to try to use one of our Storage array as an SMB and would like me to move an existing port to our main VLAN (1 to be boring) but also wants me to enable Jumbo Frames (MTU 9216) but it loos like this can only be set on a per VLAN or PortChannel level, as the regular MTU setting in the INT is not being accepted.

Am I correct that this cannot be done on an individual basis.

Thanks

David Kafrissen

[Flavio Miranda]

Hi

"

MTU Configuration

The Cisco Nexus device switch does not fragment frames. As a result, the switch cannot have two ports in the same Layer 2
domain with different maximum transmission units (MTUs). A per-physical Ethernet interface MTU is not supported. Instead, the MTU
is set according to the QoS classes. You modify the MTU by setting class and policy maps."

https://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus3000/sw/interfaces/6_x/b_Cisco_n3k_Interfaces_Configuration_Guide_602_U11/b_Cisco_n3k_Interfaces_Configuration_Guide_602_U11_chapter_010.html#con_1266623 

[dkafrissen]

HI

Thanks for the response.

So we already have QOS set to jumbo, that would mean that the VLAN and the port are already set that way?
I thought it was better not to waste the overhead with assigning Jumbo to ports that were not using.

THanks

David

[balaji.bandi]

depends on how you con figured system global level or per port :

https://www.cisco.com/c/en/us/support/docs/switches/nexus-9000-series-switches/118994-config-nexus-00.html