Shutting Down And Restarting An Interface - Cisco Catalyst 4500 series Administration Manual

Chapter 8 Configuring Interfaces

Shutting Down and Restarting an Interface

You can disable an interface, which 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.
To shut down an interface and then restart it, perform this task:
Command
Step 1
Switch(config)# interface {vlan vlan_ID} |
{{fastethernet | gigabitethernet |
tengigabitethernet} slot/port} | {port-channel
port_channel_number}
Step 2
Switch(config-if)# shutdown
Step 3
Switch(config-if)# no shutdown
This example shows how to shut down Fast Ethernet interface 5/5:
Switch(config)# interface fastethernet 5/5
Switch(config-if)# shutdown
Switch(config-if)#
*Sep 30 08:33:47: %LINK-5-CHANGED: Interface FastEthernet5/5, changed state to a
administratively down
Switch(config-if)#
This example shows how to reenable Fast Ethernet interface 5/5:
Switch(config-if)# no shutdown
Switch(config-if)#
*Sep 30 08:36:00: %LINK-3-UPDOWN: Interface FastEthernet5/5, changed state to up
Switch(config-if)#
To verify whether an interface is disabled, enter the EXEC show interfaces command. An interface that
has been shut down appears as "administratively down."
Configuring Interface Link Status and Trunk Status Events
You can configure interface link status and trunk status events. On the Catalyst 4500 series switch, the
following interface logging event notifications are supported both globally and per interface:
•
•
Use the [no] logging event link-status use-global command to enable or disable the interface link status
event. Use the [no] logging event trunk-status use-global command to enable or disable the interface
trunk status event.
Each interface link status logging event can be configured in one of the following states:
•
•
OL-30933-01
Enable or disable notification on the interface whenever its data link status is changed.
Enable or disable notification on the trunk interface whenever its trunking status is changed.
logging event link-status—Link status logging event is enabled explicitly on the interface
regardless of the switch global setting.
no logging event link-status—Link status logging event is disabled explicitly on the interface
regardless of the switch global setting.
Purpose
Specifies the interface to be configured.
Shuts down the interface.
Reenables the interface.
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
Monitoring and Maintaining the Interface
8-37