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Software Configuration Guide—Release 12.2(25)SG
OL-7659-02
Chapter 4 Configuring Interfaces
Monitoring and Maintaining the Interface
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 will not be mentioned in any
routing updates.
To shut down an interface and then restart it, perform this task:
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 will appear 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:
• Enable/disable notification on the interface whenever its data link status is changed.
• Enable/disable notification on the trunk interface whenever its trunking status is changed.
Use the [no]
logging event link-status [use-global] command to enable/disable the interface link status
event. Use the [no]
logging event trunk-status [use-global] command to enable/disable the interface
trunk status event.
Each interface link status logging event can be configured in one of the following states:
• 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.
Command Purpose
Step 1
Switch(config)# interface {vlan
vlan_ID
} |
{{fastethernet | gigabitethernet |
tengigabitethernet}
slot
/
port
} | {port-channel
port_channel_number
}
Specifies the interface to be configured.
Step 2
Switch(config-if)# shutdown
Shuts down the interface.
Step 3
Switch(config-if)# no shutdown
Reenables the interface.