Jumbo frame configuration on Nexus

I have tried to explain the MTU configuration on the Nexus platform. MTU configuration varies based on the port type and hardware platform.

1. Layer 3 MTU Configurations

MTU configuraiton on L3 port is quite straight forward. Configuration is also same on all the platforms. We just need to give the MTU command on the interface configuration mode.

Configure MTU on a Switched Virtual Interface (SVI)

interface vlan 1
mtu 9216

Configure MTU on a Layer 3 Port

interface ethernet 1/1
no switchport
mtu 9216

2. Layer 2 MTU Configurations

MTU configuration on L2 port varies based on the hardware. On some platforms, we have to modify MTU under network-qos policy whereas on some MTU commands can be given under interface configuration mode.

2.1 Using QOS policy

On below hardware, jumbo frames can be configured using QOS policy.

Nexus 3000: Includes Nexus 3048, 3064, 3132Q, 3132Q-X, 3132Q-XL, 3172, and 3500 Series switches

Nexus 5000: All Nexus 5000 and 5500 Series switches

Nexus 6000: All Nexus 6000 Series switches

    Configuration: -

policy-map type network-qos jumbo
  class type network-qos class-default
          mtu 9216
system qos
  service-policy type network-qos jumbo

2.1 Per-Port MTU Configuration

On below hardware, jumbo frames can be configured directly under the interface.

           Nexus 3000: Includes Nexus 3132Q-V, 3164, 31108, 31128PQ, 3200 Series, and 36180YC-R switches

Nexus 7000: All Nexus 7000- and 7700 Series switches

Nexus 9000: All Nexus 9200 Series switches (includes 92xxx), 9300 Series switches (includes 93xxx), and 9500 Series switches

Nexus(config)#interface ethernet 1/1
Nexus(config-if)#mtu 9216