System Mtu - Cisco Catalyst 2950 Command Reference Manual

system mtu

system mtu
Use the system mtu global configuration command to set the maximum packet size or maximum
transmission unit (MTU) size for the switch. Use the no form of this command to restore the global MTU
value to its original default value.
Syntax Description
bytes
Defaults
The default MTU size is 1500 bytes.
Command Modes Global configuration
Command History Release
12.1(6)EA2
Usage Guidelines This table lists the valid system MTU values for the switches:
Switch
Catalyst 2950G-12-EI
Catalyst 2950G-24-EI
Catalyst 2950G-24-EI-DC
Catalyst 2950G-48-EI
Catalyst 2950 Long-Reach Ethernet (LRE)
switches
Catalyst 2955 switches
Other non-LRE Catalyst 2950 switches
The size of frames that can be received by the switch CPU is limited to 1500 bytes, no matter what value
was entered with the system mtu command. Although frames that are forwarded or routed typically are
not received by the CPU, in some cases packets are sent to the CPU, such as traffic sent to control traffic,
Simple Network Management Protocol (SNMP), Telnet, or routing protocols.
If you enter a value that is outside of the range for the switch, the value is not accepted.
You cannot set the MTU on a per-interface basis.
Note
Catalyst 2950 and Catalyst 2955 Switch Command Reference
2-514
system mtu bytes
no system mtu
Packet size in bytes. For valid values, see the "Usage Guidelines" section.
Modification
This command was introduced.
Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands
MTU size
1500 to 1530 bytes
1500 bytes
0L-10102-01