Cisco Catalyst 4500 Series Command Reference Guide

2-485
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
OL-27596 -01
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 The default settings are as follows:
• Jumbo frames are disabled
• 1500 bytes for all ports
Command Modes Interface configuration mode
Command History
Usage Guidelines Jumbo frames are supported on nonblocking Gigabit Ethernet ports, switch virtual interfaces (SVI), and
EtherChannels. Jumbo frames are not available for stub-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 interfaces to support an Ethernet payload size of up to 1552 bytes.
Both the system mtu command and the per-interface mtu command work on interfaces that can support
jumbo frames, but the per-interface mtu command takes precedence.
Examples This example shows how to specify an MTU of 1800 bytes:
Switch(config)# interface GigabitEthernet 1/1
Switch(config-if)# mtu 1800
Related Commands
bytes Byte size; valid values are from 1500 to 9198.
Release Modification
12.1(13)EW Support for this command was introduced on the Catalyst 4500 series switches.
Command Description
system mtu Sets the maximum Layer 2 or Layer 3 payload size.

Cisco Catalyst 4500 Series Specifications

General

Series	Catalyst 4500 Series
Category	Switch
Layer Support	Layer 2, Layer 3
Form Factor	Modular chassis
Stackable	No
Chassis Slots	3, 6, 7, 10
Power Supply Options	AC, DC
Redundancy	Power supply, Supervisor engine
Network Management	Cisco IOS Software CLI, SNMP, Cisco Prime Infrastructure
Features	Security, QoS
Port Density	Up to 384 ports per chassis
Security Features	802.1X, ACLs, DHCP Snooping, Dynamic ARP Inspection, IP Source Guard
Supervisor Engine	8-E