Hello Abillo
All you need to do is put this configuration on all your nexus 5ks:
switch(config)#policy-map type network-qos jumbo
switch(config-pmap-nq)#class type network-qos class-default
switch(config-pmap-c-nq)#mtu 9216
switch(config-pmap-c-nq)#exit
switch(config-pmap-nq)#exit
switch(config)#system qos
switch(config-sys-qos)#service-policy type network-qos jumbo
This will globally enable jumbo frames.
To verify whether it works, do a "show int eth x/y", you should see the jumbo counters increasing.
Also note that the mtu won't change on the interface itself, its a global command, not a 'per interface' command. But thats ok, even if mtu says 1500 it can still accept jumbo frames if you have the global config applied.
Example:
Ethernet1/1 is up
...
RX
0 unicast packets 1221713 multicast packets 2644 broadcast packets
1224357 input packets 91236171 bytes
---> 458 jumbo packets 0 storm suppression packets
0 giants 0 input error 0 short frame 0 overrun 0 underrun
0 watchdog 0 if down drop
0 input with dribble 0 input discard
0 Rx pause
Please refer to this link:
http://www.cisco.com/en/US/products/ps9670/products_configuration_example09186a0080b44116.shtml
Hope that will help you.
Alex
