Cisco Catalyst 3750 - Page 211

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Catalyst 3750 Switch Command Reference
OL-8552-07
Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
errdisable detect cause
Command Default Detection is enabled for all causes. All causes, except for per-VLAN error disabling, are configured to
shut down the entire port.
Command Modes Global configuration
Command History
Usage Guidelines A cause (link-flap, dhcp-rate-limit, and so forth) is the reason why the error-disabled state occurred.
When a cause is detected on a port, the port 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, voice aware 802.1x security, guard 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 port 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 change the port from the error-disabled
state.
Examples This example shows how to enable error-disable 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:
Switch(config)# 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 settings by entering the show errdisable detect privileged EXEC command.
Release Modification
12.1(11)AX This command was introduced.
12.1(14)EA1 The loopback keyword was added.
12.1(19)EA1 The dhcp-rate-limit keyword was added.
12.2(20)SE The arp-inspection keyword was added.
12.2(25)SE The l2ptguard keyword was added.
12.2(37)SE The Per-VLAN error-detection feature was added. The inline-power and
sfp-config-mismatch keywords were added.
12.2(46)SE The security-violation shutdown vlan keywords were added.