Shutting Down And Restarting The Interface - Cisco Catalyst 3550 series Software Configuration Manual

Monitoring and Maintaining the Interfaces
Use the clear interface or clear line privileged EXEC command to clear and reset an interface or serial
line. Under most circumstances, you do not need to clear the hardware logic on interfaces or serial lines.
This example shows how to clear and reset Fast Ethernet interface 0/5:
Switch# clear interface fastethernet0/5

Shutting Down and Restarting the Interface

Shutting down an interface disables all functions on the specified interface and marks the interface as
unavailable on all monitoring command displays. This information is communicated to other network
servers through all dynamic routing protocols. The interface is not mentioned in any routing updates.
Beginning in privileged EXEC mode, follow these steps to shut down an interface:
Command
Step 1 configure terminal
Step 2
interface {vlan vlan-id} | {{fastethernet | gigabitethernet}
interface-id} | {port-channel port-channel-number}
Step 3
shutdown
Step 4
end
Step 5 show running-config
Use the no shutdown interface configuration command to restart the interface.
This example shows how to shut down Fast Ethernet interface 0/5:
Switch# configure terminal
Switch(config)# interface fastethernet0/5
Switch(config-if)# shutdown
Switch(config-if)#
*Sep 30 08:33:47: %LINK-5-CHANGED: Interface FastEthernet0/5, changed state to a
administratively down
This example shows how to re-enable Fast Ethernet interface 0/5:
Switch# configure terminal
Switch(config)# interface fastethernet0/5
Switch(config-if)# no shutdown
Switch(config-if)#
*Sep 30 08:36:00: %LINK-3-UPDOWN: Interface FastEthernet0/5, changed state to up
To verify that an interface is disabled, enter the show interfaces privileged EXEC command. A disabled
interface is shown as administratively down in the show interface command display.
Catalyst 3550 Multilayer Switch Software Configuration Guide
10-22
Chapter 10 Configuring Interface Characteristics
Purpose
Enter global configuration mode.
Select the interface to be configured.
Shut down an interface.
Return to privileged EXEC mode.
Verify your entry.
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