Specifications

B-16
Catalyst 2950 and Catalyst 2955 Switch Command Reference
78-15304-01
Chapter B 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 output.
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 This command can be entered only from the switch console.
The undebug spanning-tree switch command is the same as the no debug spanning-tree switch
command.
all Enable all the debugging messages.
errors Enable debugging of error messages for the interface between the spanning-tree
software module and the port manager software module.
general Enable debugging of general events.
helper Enable debugging of the spanning-tree helper task, which handles bulk
spanning-tree updates.
pm Enable debugging of port manager events.
rx Display received bridge protocol data unit (BPDU) handling debugging messages.
The keywords have these meanings:
decode—Enable debugging of received packets.
errors—Enable debugging of receive errors.
interrupt—Enable debugging of interrupt service requests (ISRs).
process—Enable debugging of process receive BPDUs.
state—Enable debugging of spanning-tree port state changes.
tx [decode] Display transmitted BPDU handling debugging messages.
Release Modification
12.1(6)EA2 This command was first introduced.
12.1(9)EA1 The helper keyword was added.