[c-nsp] How can I increase Ethernet MTU?

Nick Hilliard nick at foobar.org
Sat Jan 24 07:18:24 EST 2015

On 24/01/2015 11:47, Lukas Tribus wrote:
> Don't think it will work without reload though ...

Yes, it needs a reboot on the C3560/3750X platform.  The command is:

Switch(config)#system mtu jumbo 9198

It's a pain that Cisco doesn't enable jumbo MTUs on all switches by
default.  Occasionally a 1500 byte MTU switch slips into production and
it's a real pain to get this sorted, especially if someone has dumped new
software on the box without using "archive download-sw /upgrade-ucode" to
do a microcode preload.  Otherwise it's 35m of downtime to fix the problem,


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