Cisco’s documentation implies that to enable jumbo frames on the 5K and 9K line, one must simply set mtu 9216 on the physical and logical L1/L2 interfaces:
However, currently working with the 93180YC-EX and previously worked with the 5672UP, I can tell you that both are actually based on the obscure 6K line.
So, in order to get jumbo frames, you have to do this additional step:
policy-map type network-qos jumbo class type network-qos class-default mtu 9216 system qos service-policy type network-qos jumbo
After applying this, also do a set mtu 9216 on the on the L3 SVIs:
Switch(config)#interface Vlan200 no shutdown mtu 9216 Switch# show interface vl200 Vlan200 is up, line protocol is up, autostate enabled Hardware is EtherSVI, address is 70ea.1a44.d0a7 Internet Address is 192.168.200.1/24 MTU 9216 bytes, BW 1000000 Kbit, DLY 10 usec,