Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
mtu
mtu
To enable jumbo frames on an interface by adjusting the maximum size of a packet or maximum
transmission unit (MTU), use the mtu command. To return to the default setting, use the no form of this
command.
mtu bytes
no mtu
Syntax Description
Defaults T he default settings are as follows:
• Jum bo frames are disabled
• 1500 bytes f or all ports
Command Modes Interface configuration mode
Usage Guidelines Ju mbo fra mes are sup ported on nonbloc king Gigabi t Etherne t ports, s witch vi rtual inter faces (SVI), and
EtherChannels. Jumbo fr ames are not available for stu b-based ports.
The baby giants feature uses the global system mtu size command to set the global baby giant MTU. It
allows all stub-based port in terfaces to support an Ether net payload size of up to 1552 byte s.
Both the system mtu command and the per-interface mtu command work on interface s that can support
jumbo frames, bu t the per-inter face mtu command takes precedence.
Examples This exampl e shows how to specify an MTU of 1800 byte s:
Switch(config)# interface GigabitEthernet 1/1
Switch(config-if)# mtu 1800
Related Commands
bytes Byte size; valid values are from 1500 to 9198.
Command Description
system mtu Se ts the maximum Layer 2 or Layer 3 pa yload size.