[Nexus NX-OS] MTU + FCoE

[andre.godoy]

Hello Experts,

Do you guys have any experience or had a chance to apply Jumbo MTU commands with FCoE in production?

I wonder if this can have any impact. Today this switches is just L2 and FCoE is running , but with MTU default.

policy-map type network-qos jumbo-plus-FCOE
class type network-qos class-fcoe
pause no-drop
mtu 2158
class type network-qos class-default
mtu 9216
system qos
service-policy type qos input fcoe-default-in-policy
service-policy type queuing input fcoe-default-in-policy
service-policy type queuing output fcoe-default-out-policy
service-policy type network-qos jumbo-plus-FCOE

Thanks!

[Brandon Rumer (Cisco) · Accepted solution]

Official answer: do this in a maintenance window as it could cause data plane disruption.

With that said, one of my customer's moved to an MTU of 9216 (from 1500) for 'class type network-qos class-default' and there wasn't any impact to the production network. Still, this was done in a maintenance window.

[andre.godoy]

Great , thank you @Brandon Rumer (Cisco) . I did the change last week and wasn't any impact to the network.

[Brandon Rumer (Cisco)]

Great! Thanks for following up.

Sorry I missed your previous post.