Users Guide

debug spanning-tree
Enables STP to debug and display protocol information.
Syntax
debug spanning-tree {all | bpdu [tx | rx] | events}
Parameters
● all — Debugs all spanning-tree operations.
● bpdu — Enter transmit (tx) or receive (rx) to enable the debug direction.
● events — Debugs STP events.
Default Not configured
Command Mode EXEC
Usage
Information
None
Example
OS10# debug spanning-tree bpdu rx
Supported
Releases
10.5.0 or later
errdisable detect cause bpduguard
Configures the port to be shut down or moves the port to blocked state on detecting a BPDU guard violation.
Syntax
errdisable detect cause bpduguard
Parameters None
Default Enabled
Command Mode CONFIGURATION
Usage
Information
This command applies only to STP-enabled ports. The command takes effect only when the BPDU guard
is configured on a port.
When the detect cause option is enabled, the port is shut down whenever there is a BPDU guard
violation.
When the option is disabled, the port is not shut down but moved to BLOCKING state whenever there is
a BPDU guard violation. In this case, the port is operationally DOWN in spanning-tree mode and when the
recovery timer expires after 300 seconds, the port is UP irrespective of the recovery cause configuration.
The no version of the command disables the detect cause option.
Example
OS10(config)# errdisable detect cause bpduguard
Supported
Releases
10.4.2.0 or later
errdisable recovery cause bpduguard
Enables to recover the ports shut down due to BPDU Guard violation.
Syntax
errdisable recovery cause bpduguard
Parameters None
Default Disabled
Command Mode CONFIGURATION
Usage
Information
This command applies only to STP-enabled ports. The command takes effect only when BPDU guard is
configured on a port and errdisable detect cause bpduguard is enabled.
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