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Catalyst 3560 Switch Software Configuration Guide
OL-8553-06
Chapter 11 Configuring Interface Characteristics
Configuring the System MTU
This example shows how to configure a port as a routed port and to assign it an IP address:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# no switchport
Switch(config-if)# ip address 192.20.135.21 255.255.255.0
Switch(config-if)# no shutdown

Configuring SVI Autostate Exclude

Configuring SVI autostate exclude on an access or trunk port in an SVI excludes that port in the
calculation of the status of the SVI (up or down line state) even if it belongs to the same VLAN. When
the excluded port is in the up state, and all other ports in the VLAN are in the down state, the SVI state
is changed to down.
At least one port in the VLAN should be up and not excluded to keep the SVI line state up. You can use
this command to exclude the monitoring port status when determining the status of the SVI.
Beginning in privileged EXEC mode, follow these steps to exclude a port from SVI state-change
calculations:
This example shows how to configure an access or trunk port in an SVI to be excluded from the status
calculation:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet0/2
Switch(config-if)# switchport autostate exclude
Switch(config-if)# exit
Configuring the System MTU
The default maximum transmission unit (MTU) size for frames received and transmitted on all interfaces
on the switch 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.
Command Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 interface interface-id Specify a Layer 2 interface (physical port or port
channel), and enter interface configuration mode.
Step 3 switchport autostate exclude Exclude the access or trunk port when defining the
status of an SVI line state (up or down)
Step 4 end Return to privileged EXEC mode.
Step 5 show running config interface interface-id
show interface interface-id switchport
(Optional) Show the running configuration.
Verify the configuration.
Step 6 copy running-config startup-config (Optional) Save your entries in the configuration file.