Cisco Catalyst 3560-X Command Reference Manual page 226

errdisable detect cause
Command Default
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Catalyst 3750-X and 3560-X Switch Command Reference
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Detection is enabled for all causes. All causes, except for per-VLAN error disabling, are configured to
shut down the entire port.
Global configuration
Release Modification
12.2(53)SE2 This command was introduced.
A cause (link-flap, dhcp-rate-limit, and so forth) is the reason for the error-disabled state. When a
cause is detected on an interface, the interface is placed in an error-disabled state, an operational state
that is similar to a link-down state.
When a port is error-disabled, it is effectively shut down, and no traffic is sent or received on the port. For the
BPDU guard, voice aware 802.1x security, and port-security features, you can configure the switch to
shut down just the offending VLAN on the port when a violation occurs, instead of shutting down the
entire port.
If you set a recovery mechanism for the cause by entering the errdisable recovery global configuration
command for the cause, the interface is brought out of the error-disabled state and allowed to retry the
operation when all causes have timed out. If you do not set a recovery mechanism, you must enter the
shutdown and then the no shutdown commands to manually recover an interface from the
error-disabled state.
This example shows how to enable error-disabled detection for the link-flap error-disabled cause:
Switch(config)# errdisable detect cause link-flap
This command shows how to globally configure BPDU guard for per-VLAN error disable:
witch(config)#
S errdisable detect cause bpduguard shutdown vlan
This command shows how to globally configure voice aware 802.1x security for per-VLAN error
disable:
Switch(config)# errdisable detect cause security-violation shutdown vlan
You can verify your setting by entering the show errdisable detect privileged EXEC command.
Command
show errdisable detect
show interfaces status err-disabled
clear errdisable interface
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Chapter 2 Catalyst 3750-X and 3560-X Switch Cisco IOS Commands
Description
Displays error-disabled detection information.
Displays interface status or a list of interfaces in the
error-disabled state.
Clears the error-disabled state from a port or VLAN that
was error disabled by the per-VLAN error disable feature.
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