MTU for SVL

[ckuwajima]

Is it necessary to change the MTU for SVL links in a scenario in which interfaces are configured with MTU larger than default 1500 bytes?
Traffic could flow between chassis through SVL links in a Stackwise Virtual cluster. Could not find any references in StackWise Virtual configuration guides.

[Reza Sharifi]

Port MTU for SVL links Can not be changed

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9400/software/release/17-1/configuration_guide/int_hw/b_171_int_and_hw_9400_cg/configuring_per_port_mtu.pdf

HTH

[ckuwajima]

Thanks.

Does this mean that System MTU needs to be changed in a scenario in which ports with MTU larger than 1500 bytes is necessary?

[Reza Sharifi]

No, usually system MTU does not need to be changed.

HTH

[ckuwajima]

I decided to be increase the MTU globally (system mtu 9216).

This changed the SVL interfaces to 9216 automatically, and I am sure that there will be no issues with jumbo frames traversing these links.

[balaji.bandi]

You can have 2 option system MTU and per interface, SVI is just logical interface, you can change the MTU  and also speed - some time some monitor system complain about utilization.

Make sure other side also support jumbo frames