Cisco Catalyst 4500 Series Command Reference Guide

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
system mtu
system mtu
To set the maximum Layer 2 or Layer 3 payload size, use the system mtu command. To revert to the
default MTU setting, use the no form of this command.
system mtu datagram-size
no system mtu
Syntax Description
Defaults The default MTU setting is 1500 bytes.
Command Modes Global configuration mode
Command History
Usage Guidelines The datagram-size parameter specifies the Ethernet payload size, not the total Ethernet frame size, and
the Layer 3 MTU is changed as a result of changing the system mtu command.
For ports from 3 to18 on model WS-X4418-GB and ports from 1 to 12 on model WS-X4412-2GB-TX,
only the standard IEEE Ethernet payload size of 1500 bytes is supported.
For other modules, an Ethernet payload size of up to 1552 bytes is supported with a total Ethernet frame
size of up to 1600 bytes.
Examples This example shows how to set the MTU size to 1550 bytes:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# system mtu 1550
Switch(config)# end
Switch#
This example shows how to revert to the default MTU setting:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# no system mtu
Switch(config)# end
Switch#
datagram-size Layer 2 payload size; valid values from 1500 to 1552 bytes.
Release Modification
12.1(12c)EW Support for this command was introduced on the Catalyst 4500 series switch.

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