Command Reference Guide

3Com Router 3000 Ethernet Family
Command Reference Guide Chapter 3 Bridge Configuration Commands
3Com Corporation
3-14
event: Enables STP event debugging.
packet: Enables STP packet debugging.
Description
Use the debugging stp command to enable STP debugging.
Use the undo debugging stp command to disable STP debugging.
Example
# Enable STP packet debugging.
<router> debugging stp packet
Enable spanning-tree protocol packet debugging functions.
STP PACKET: Send Configuration BPDU to Ethernet1/0/1
TopologyChange:0, TopologyChangeAcknowledgment:0,
RootID:8000.00e0.fc04.9dc2
RootCost:0, BridgeID:8000.00e0.fc04.9dc2, PortID:8003
MessageAge:0, MaxAge:20, HelloTime:2, Forward:15
STP PACKET: Send TCN BPDU to Ethernet1/0/0
Table 3-1 Description on the fields of the debugging stp packet command
Field Description
STP PACKET: Send Configuration
BPDU to Ethernet1/0/1
A configuration BPDU is sent to port
Ethernet1/0/1.
TopologyChange:0,
TopologyChangeAcknowledgment:0
Both topology change bit and topology
change acknowledgement bit are zero,
meaning the topology does not change.
RootID:8000.00e0.fc04.9dc2
ID of the bridge root on the spanning
tree
RootCost:0,
BridgeID:8000.00e0.fc04.9dc2,
PortID:8003
Cost of the root port, ID of this bridge,
and ID of this port
MessageAge:0, MaxAge:20,
HelloTime:2, Forward:15
MessageAge is the current age of the
packet, MaxAge is the aging timer. If the
message age of the packet equals the
Max Age timer, the packet is dropped.
HelloTime is the hello interval.
Forward is the time that the port must
wait before changing its states.
STP PACKET: Send TCN BPDU to
Ethernet1/0/0
A TCN packet is sent to Ethernet 1/0/0
# Enable STP event debugging.
<Router> debugging stp event