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 | config | events | exceptions |
general | root] | 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.
cong (OPTIONAL) Enter the keyword config to debug conguration information.
events (OPTIONAL) Enter the keyword events to debug STP events.
general (OPTIONAL) Enter the keyword general to debug general STP operations.
root (OPTIONAL) Enter the keyword root to debug STP root transactions.
Command Modes EXEC Privilege
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.10(0.0) Introduced on the S6100–ON.
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.3.7.0 Introduced on the S4810.
7.7.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
6.2.1.1 Introduced on the E-Series.
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
• protocol spanning-tree — enters SPANNING TREE mode on the switch.
1474 Spanning Tree Protocol (STP)