Debug Spanning-Tree Switch - Cisco Catalyst 3550 Command Reference Manual

Appendix B Catalyst 3550 Switch Debug Commands

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.
Syntax Description all
errors
general
helper
pm
rx
tx [decode]
Defaults Debugging is disabled.
Command Modes
Privileged EXEC
Command History Release
12.1(4)EA1
12.1(9)EA1
Usage Guidelines
The undebug spanning-tree switch command is the same as the no debug spanning-tree switch
command.
OL-8566-02
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]}
Display all spanning-tree switch debug messages.
Display debug messages for the interface between the spanning-tree software
module and the port manager software module.
Display general event debug messages.
Display spanning-tree helper task debug messages. Helper tasks handle bulk
spanning-tree updates.
Display port manager event debug messages.
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 (ISRs) debug messages.
process—Display process receive BPDU debug messages.
state—Display spanning-tree port state change debug messages.
Display transmitted BPDU handling debug messages.
Modification
This command was introduced.
The helper keyword was added.
Catalyst 3550 Multilayer Switch Command Reference
debug spanning-tree switch
B-43