Specifications

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Cisco ME 2400 Ethernet Access Switch Command Reference
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Chapter 2 Cisco ME 2400 Ethernet Access Switch Cisco IOS Commands
system mtu
Note The switch does not support setting the MTU on a per-interface basis.
The size of frames that can be received by the switch CPU is limited to 1998 bytes, regardless of the
value entered with the system mtu command. Although forwarded or routed frames are usually not
received by the CPU, some packets (for example, control traffic, SNMP, Telnet, and routing protocols)
are sent to the CPU.
Because the switch does not fragment packets, it drops switched packets larger than the packet size
supported on the egress interface.
For example, if the system mtu value is 1998 bytes and the system mtu jumbo value is 5000 bytes,
packets up to 5000 bytes can be received on interfaces operating at 1000 Mbps. However, although a
packet larger than 1998 bytes can be received on an interface operating at 1000 Mbps, if its destination
interface is operating at 10 or 100 Mbps, the packet is dropped.
Examples This example shows how to set the maximum packet size for Gigabit Ethernet ports to 1800 bytes:
Switch(config)# system mtu jumbo 1800
Switch(config)# exit
Switch# reload
You can verify your setting by entering the show system mtu privileged EXEC command.
Related Commands Command Description
show system mtu Displays the packet size set for Fast Ethernet and Gigabit
Ethernet ports.