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Setting the Port Configuration
When you enter the clear config all command or in the event of a configuration loss, all ports collapse
into VLAN 1. This situation might cause a security and network instability problem. Entering the set
default portstatus command puts all ports into a disable state and blocks the traffic flowing through the
ports during a configuration loss. You can then manually configure the ports back to the enable state.
The default port status configuration is stored on the chassis. The configuration is tied to a chassis and
not to the supervisor engine. The clear config all command uses this setting to determine whether ports
should be enabled or disabled when returning to default configuration. The clear config all command
does not change the default port status setting on the chassis. The output of the show config command
shows the current default port status configuration.
To change the port enable state, perform this task in privileged mode:
Task
Step 1
Change the port enable state.
Step 2
Display the port enable state.
This example shows how to change the default port enable state from enabled to disabled:
Console> (enable) set default portstatus disable
Default port status set to disable.
Console> (enable)
This example shows how to display the port enable state:
Console> (enable) show default
portstatus: disable
Console> (enable)
Setting the Port Debounce Timer
You can set the port debounce timer on a per-port basis for Ethernet, Fast Ethernet, Gigabit Ethernet, and
10-Gigabit Ethernet ports. When you set the port debounce timer, the switch delays notifying the main
processor of a link change that can decrease traffic loss due to network reconfiguration.
Caution
Enabling the port debounce timer causes link up and link down detections to be delayed, resulting in loss
of data traffic during the debouncing period. This situation might affect the convergence and
reconvergence of various Layer 2 and Layer 3 protocols.
Table 4-4
before and after the switch enables the debounce timer.
Table 4-4
Port Type
10BASE-FL ports
10/100BASE-TX ports
100BASE-FX ports
10/100/1000BASE-TX ports
1000BASE-TX ports
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
4-10
Chapter 4
Configuring Ethernet, Fast Ethernet, Gigabit Ethernet, and 10-Gigabit Ethernet Switching
lists the time delay that occurs before the switch notifies the main processor of a link change
Port Debounce Timer Delay Time
Command
set default portstatus {enable | disable}
show default
Debounce Timer Disabled
300 milliseconds
300 milliseconds
300 milliseconds
300 milliseconds
300 milliseconds
Debounce Timer Enabled
3100 milliseconds
3100 milliseconds
3100 milliseconds
3100 milliseconds
3100 milliseconds
OL-8978-04
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Troubleshooting
