Thursday, January 28, 2021

Cisco C9500 MTU

Hi!

We just received our new C9500 core switches. I saw that system mtu was set to 9100 by default.

New SVIs are also 9100. Will this affect performance considering the users in these VLANs are at 1500 ?

We will also have an SVI for the upstream firewalls (firewalls are using 1500).

I know that putting jumbo MTU on L2 interfaces is generally harmless but what about L3 interfaces (routed port, SVI) ?

I can't seem to understand how everything fits together (L2 vs L3 MTU, etc.) and what are the best practices.

Thank you for the help !



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