[c-nsp] Nex3K and MTU

[Christophe Fillot]

On 03/03/2016 02:10 AM, CiscoNSP List wrote:
> Yet "other" ports show 1500bytes:
>
> # sh int eth 1/1
> Ethernet1/1 is down (Link not connected)
> Dedicated Interface
>   Hardware: 10/100/1000 Ethernet, address: 547f.ee7b.ff28 (bia 547f.ee7b.ff28)
>   MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec
>   reliability 255/255, txload 1/255, rxload 1/255
>   Encapsulation ARPA
>   Port mode is access
>

To see the real MTU you have to use "show queuing interface <phys_int>".
For example:

# sh int e1/45
Ethernet1/45 is up
 Dedicated Interface

  Hardware: 1000/10000 Ethernet, address: 8c60.4f96.2cf4 (bia
8c60.4f96.2cf4)
  Description: storage2-01
  *MTU 1500 bytes*,  BW 10000000 Kbit,, BW 10000000 Kbit, DLY 10 usec
[...]

# sh queuing int e1/45
n5k-pg2-a# sh queuing int e1/45
Ethernet1/45 queuing information:
  TX Queuing
    qos-group  sched-type  oper-bandwidth
        0       WRR            100

  RX Queuing
    qos-group 0
    q-size: 100160, q-size-40g: 100160, *HW MTU: 9216 (9216 configured)*
    drop-type: drop, xon: 0, xoff: 0
[...]

Hope this helps

Christophe