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Cisco IE 3010 Switch Software Configuration Guide
OL-23145-01
Chapter 12 Configuring Interface Characteristics
Configuring Layer 3 Interfaces
Use the no description interface configuration command to delete the description.
This example shows how to add a description on a port and how to verify the de scription:
Switch# config terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# description Connects to Marketing
Switch(config-if)# end
Switch# show interfaces gigabitethernet0/2 description
Interface Status Protocol Description
Gi0/2 admin down down Connects to Marketing
Configuring Layer 3 Interfaces
The switch does not support routing, but you can configure an IP address on an interface by using the no
switchport interface configuration command to facilitate device management.
Configuring the System MTU
The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces
is 1500 bytes. You can increase the MTU size for all interfaces operating at 10 or 100 Mb/s by using the
system mtu global configuration command. You can increase the MTU size to support jumbo frames on
all Gigabit Ethernet interfaces by using the system mtu jumbo global configuration command.
You can change the MTU size for routed ports by using the system mtu routing global configuration
command.
Note You cannot configure a routing MTU size that exceeds the system MTU size. If you change the system
MTU size to a value smaller than the currently configured routing MTU size, the configuration change
is accepted, but not applied until the next switch reset. When the configuration change takes effect, the
routing MTU size automatically defaults to the new system MTU size.
Gigabit Ethernet ports are not affected by the system mtu command; 10/100 ports are not affected by
the system mtu jumbo command. If you d o not configure the system mtu jumbo command, the setting
of the system mtu command applies to all Gigabit Ethernet interfaces.
You cannot set the MTU size for an individual interface; you set it for all 10/100 or all Gigabit E thernet
interfaces. When you change the system or jumbo MTU size, you must reset the switch before the new
configuration takes effect.The system mtu routing command does not require a switch reset to take
effect.
Step 5 show interfaces interface-id description
or
show running-config
Verify your entry.
Step 6 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose