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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter10 Configuring Interface Characteristics
Configuring the System MTU
To remove an IP address from an interface, use the no ip address interface configuration command.
This example shows how to configure a port as a routed port and to assign it an IP a dd ress:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# no switchport
Switch(config-if)# ip address 192.20.135.21 255.255.255.0
Switch(config-if)# no shutdown
Configuring the System MTU
The default maximum transmission unit (MTU) size for frames received and sent on a ll interfaces on the
switch or switch stack is 1500 bytes. You can change the MTU size to support switched jumbo frames
on all Gigabit Ethernet and 10-Gigabit Ethernet interfaces and to support routed frames on all route d
ports.
•The system jumbo MTU value applies to switched packets on the Gigabit Ethernet and 10-Gigabit
Ethernet ports of the switch or switch stack. Use the system mtu jumbo bytes g lobal configuration
command to specify the system jumbo MTU value.
•The system routing MTU value applies only to routed packets on all rout ed por ts of the switc h or
switch stack. Use the system mtu routing bytes global configuration command to specify the
system routing MTU value.
When configuring the system MTU values, follow these guidelines:
•The switch does not support the MTU on a per-interface basis.
•You can enter the system mtu bytes global configuration command on a switch, but the command
does not take effect on the switch.
•The system mtu jumbo global configuration commands do not take effect when you enter the
system mtu routing command on a switch on which only Layer 2 ports are configured.
•When you use the system mtu bytes or system mtu jumbo bytes command to change the system
MTU or system 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.
The system MTU jumbo setting is saved in the switch environmental variable in NVRAM and
becomes effective when the switch reloads. Unlike the system MTU routing co nfigurati on, the MTU
settings you enter with the system mtu and system mtu jumbo commands are not saved in the
switch Cisco IOS configuration file, even if you enter the copy running-config startup-config
privileged EXEC command. Therefore, if you use TFTP to configure a new switch by using a backup
configuration file and want the system MTU to be other than the default, you must explicitly
configure the system mtu and system mtu jumbo settings on the new switch and then reload the
switch.
Step6 end Return to privileged EXEC mode.
Step7 show interfaces [interface-id]
show ip interface [interface-id]
show running-config interface [interface-id]
Verify the configuration.
Step8 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose