Users Guide

debug spanning-tree

Enable debugging of the spanning tree protocol and view information on the protocol.

Syntax

debug spanning-tree {stp-id [all | bpdu | events | exceptions] | protocol}

To disable debugging, use the no debug spanning-tree command.

Parameters

stp-id Enter zero (0). The switch supports one spanning tree group with a group ID of 0.

protocol Enter the keyword for the type of STP to debug, either mstp, pvst, or rstp.

all (OPTIONAL) Enter the keyword all to debug all spanning tree operations.

bpdu (OPTIONAL) Enter the keyword bpdu to debug bridge protocol data units.

events (OPTIONAL) Enter the keyword events to debug STP events.

Command Modes EXEC Privilege

Supported Modes Full–Switch Mode

Command History

Version Description

9.9(0.0) Introduced on the FN IOM.

8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.

Usage Information When you enable debug spanning-tree bpdu for multiple interfaces, the software only sends information on

BPDUs for the last interface specied.

Related Commands portfast bpdulter default — enters SPANNING TREE mode on the switch.

description

Enter a description of the spanning tree.

Syntax

description {description}

To remove the description from the spanning tree, use the no description {description} command.

Parameters

description Enter a description to identify the spanning tree (80 characters maximum).

Defaults none