Debug Spanning-Tree - Dell N1100-ON Reference Manual

Default Configuration
Display of sFlow traces is disabled by default.
Command Mode
Privileged Exec mode.
User Guidelines
Debug output should be enabled with caution. Switch behavior may be
adversely affected by the additional processing load incurred from enabling
debug.
Example
console#debug sflow packet

debug spanning-tree

Use the debug spanning-tree command to trace spanning tree BPDU packet
reception and transmission. The receive option traces only received spanning
tree BPDUs and the transmit option traces only transmitted BPDUs. When
neither keyword is used in the command, all spanning tree BPDU traces are
dumped. Vital information such as source address, destination address,
control packet type, packet length, and the interface on which the packet is
received or transmitted is displayed on the console. Use the no form of this
command to disable tracing of spanning tree BPDUs.
Syntax
debug spanning-tree bpdu [receive | transmit]
no debug spanning-tree bpdu [receive | transmit]
Default Configuration
Display of spanning tree BPDU traces is disabled by default.
Command Mode
Privileged Exec mode.
2056
Switch Management Commands