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Figure 42 Dispute guard triggering scenario
Enabling the device to log events of detecting or
receiving TC BPDUs
This feature allows the device to generate logs when it detects or receives TC BPDUs. This feature
applies only to PVST mode.
To enable the device to log events of detecting or receiving TC BPDUs:
Step Command Remarks
1. Enter system view.
system-view
N/A
2. Enable the device to log
events of receiving or
detecting TC BPDUs.
stp log enable tc
By default, the device does not
generate logs when it detects or
receives TC BPDUs.
Enabling BPDU transparent transmission on a
port
Perform this task to enable a port to transmit BPDUs transparently. Whether the spanning tree
protocols are enabled on a port does not affect the BPDU transparent transmission feature.
If this feature and the spanning tree protocol are enabled on a port which is inferior to its downstream
port, the downstream port can receive BPDUs from that port. To prevent network flapping caused by
this problem, disable the spanning tree protocol before you enable BPDU transparent transmission
on the port.
To enable BPDU transparent transmission on a port:
Device A
Device B
Root
Root port
Designated port
Normal link
Blocked link
Blocked port
Port A1 Port A2
Port B1 Port B2
Device A
Device B
Root
Port A1 Port A2
Port B1 Port B2
Normal condition
Unidirectional link
occurs
Device A
Device B
Root
Port A1
Port B1 Port B2
Dispute guard is
triggered
Port A2
Unidirectional link
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