Cisco Systems EA6500 Manual De Usuario

Release 12.1(13)E and later releases support nondefault MTU sizes between 1,500 and 9,216 bytes for 
Layer 2 Ethernet ports, configured per-port with the mtu command and globally with the 
system jumbomtu command.

With earlier releases, 9216 bytes is the only supported nondefault MTU size for Layer 2 Ethernet ports, 
configured per-port with the mtu command.

You can configure a different MTU size on each Layer 3 VLAN interface. Configuring a nondefault 
MTU size on a VLAN interface limits traffic to the nondefault MTU size.

You can configure the MTU size on VLAN interfaces to support jumbo frames with the following 
hardware and software:

Supervisor Engine 1 and Release 12.1(7)E or later

Supervisor Engine 2 and Release 12.1(8a)E or later

These sections describe how to configure MTU sizes:

To configure the MTU size, perform this task:

When configuring the MTU size, note the following syntax information:

For VLAN interfaces and Layer 3 Ethernet ports, supported MTU values are from 64 to 9216 bytes.

For Layer 2 Ethernet ports with Release 12.1(13)E and later releases, you can configure only the 
global egress LAN port MTU size (see the 

For Layer 2 Ethernet ports with earlier releases, the only supported MTU size is 9216 bytes.

Router(config)# interface {{vlan vlan_ID} | 

{{type

1

 slot/port} | {port-channel 

port_channel_number} slot/port}} 

1.

type = ethernet, fastethernet, gigabitethernet, tengigabitethernet, or ge-wan 

Selects the interface to configure.

Router(config-if)# mtu mtu_size 

Configures the MTU size. 

Router(config-if)# no mtu 

Reverts to the default MTU size (1500 bytes). 

Router(config-if)# end 

Exits configuration mode.

Router# show running-config interface 

[{gigabitethernet | tengigabitethernet} 

slot/port] 

Displays the running configuration.