Specifications

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Catalyst 4500 Se ries S wit ch C is co IO S C om mand R efer ence —Re lease I OS XE 3 .3.0 XO(1 5.1 (1)XO)
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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 comm and . To r eve rt 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 set ting is 1500 bytes.
Command Modes Global configura tion mode
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 changi ng 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 payl oad size of 1500 bytes is sup ported.
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#
Related Commands
datagram-size Layer 2 payload size; valid values from 1500 to 1552 bytes.
Command Description
show interfaces Displays traffic on a specific interface.
show system mtu Displays the global MTU setting.