Using RPVST+ debug

While the Event Log records switch-level progress, status, and warning messages on the switch, the Debug/System Logging (Syslog) feature provides a way to record Event Log and debug messages on a remote device. For example, you can send messages about routing misconfigurations and other network protocol details to an external device, and later use them to debug network-level problems. The Debug/Syslog feature allows you to specify the types of Event Log and debug messages that you want to send to an external device. The two commands described next affect debug operation for RPVST+.

Syntax:

spanning-tree clear-debug-counters [ports <port-list>][vlan <vid-list>]

Clears all spanning tree debug counters unless specific ports and/or VLANs are specified.

ports <port-list>

Clears spanning tree debug counters on the specified ports.

[ethernet]<port-list>

Clears spanning tree debug counters on an entered list of posts or all for the ports command parameter.

vlan

Clears spanning tree debug counters for the VLAN.

vlan <vlan-id-list>

One or more identifiers for the VLAN command parameter.

Using the vlan and ports options together clears the spanning tree debug counters on the specified ports for the specified VLANs. Counters maintained on the same ports for other VLANs are not cleared.

Syntax

debug rpvst [event [filter vlan <vid-list>]]

no debug rpvst [event [filter vlan <vid-list>]]

debug rpvst [packet [filter port <port-list>[vlan <vid-list>]]]

no debug rpvst [packet [filter port <port-list>[vlan <vid-list>]]]

Displays RPVST+ debug messages on the destination device specified with the debug destination logging | session | buffer command.

Parameters

event

Displays RPVST+ Event Log messages.

filter vlan <vid-list>

Limits log messages to those generated on the specified VLANs.

packet

Displays RPVST+ packets sent and received.

filter port <port-list> vlan <vid-list>

Limits packets displayed to those generated on the specified ports. If the vlan option is used, then packets displayed are further limited to the ports on the specified VLANs.

The no form of the command disables display of RPVST+ debug messages on the destination device.