C-17
Catalyst 2950 and Catalyst 2955 Switch Command Reference
OL-10102-01
Appendix C Catalyst 2950 and 2955 Switch Debug Commands
debug spanning-tree switch
debug spanning-tree switch
Use the debug spanning-tree switch privileged EXEC command to enable debugging of the software
interface between the Spanning Tree Protocol (STP) software module and the port manager software
module. Use the no form of this command to disable debugging.
debug spanning-tree switch {all | errors | general | helper | pm | rx {decode | errors | interrupt
| process} | state | tx [decode]}
no debug spanning-tree switch {all | errors | general | helper | pm | rx {decode | errors |
interrupt | process} | state | tx [decode]}
Syntax Description
Defaults Debugging is disabled.
Command Modes Privileged EXEC
Command History
Usage Guidelines The undebug spanning-tree switch command is the same as the no debug spanning-tree switch
command.
all Display all spanning-tree switch debug messages.
errors Display debug messages for the interface between the spanning-tree software
module and the port manager software module.
general Display general event debug messages.
helper Display spanning-tree helper-task debug messages. Helper tasks handle bulk
spanning-tree updates.
pm Display port-manager event debug messages.
rx Display received bridge protocol data unit (BPDU) handling debug messages. The
keywords have these meanings:
• decode—Display decoded received packets.
• errors—Display receive error debug messages.
• interrupt—Display interrupt service request (ISR) debug messages.
• process—Display process receive BPDU debug messages.
state Display spanning-tree port state change debug messages.
tx [decode] Display transmitted BPDU handling debug messages. The keyword has this
meaning:
• decode—(Optional) Display decoded transmitted packets.
Release Modification
12.1(6)EA2 This command was introduced.
12.1(9)EA1 The helper keyword was added.
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