debug spanning-tree

Enables debugging for the Spanning Tree Protocol (STP).

Syntax

debug spanning-tree { all | bpdu [ rx | tx [ all | [ interface { ethernet slot/port | port-channel number }
no debug spanning-tree { all | bpdu [ rx | tx [ all | [ interface { ethernet slot/port | port-channel number }

Command Default

STP debugging is disabled.

Parameters

all
Turns on spanning tree packet debugging on all interfaces.
bpdu
Turns on Bridge Protocol Data Unit debugging.
rx
Turns on debugging for only received spanning-tree packets.
tx
Turns on debugging for only transmitted spanning-tree packets.
interface
Specifies an interface.
ethernet
Specifies an Ethernet interface.
slot
Specifies a valid slot number. Must be 0 if the switch does not contain slots.
port
Specifies a valid port number.
port-channel number
Specifies a port-channel.

Modes

Privileged EXEC mode

Usage Guidelines

Diagnostic commands are developed and intended for specialized troubleshooting. Work closely with Extreme Networks technical support when running debug or show system internal commands and interpreting their results.

Enter terminal monitor to display debugging outputs.

Enter no debug spanning-tree to disable debugging.

Examples

To enable debugging of spanning-tree for both Rx and Tx on Ethernet interface 0/1:

device# debug spanning-tree bpdu rx interface ethernet 0/1
 
device# debug spanning-tree bpdu tx interface ethernet 0/1
 
device# show debug spanning-tree
 
MSTP debugging status:
Spanning-tree rx debugging is off
Eth 0/1 rx is on
Spanning-tree tx debugging is off
Eth 0/1 tx is on