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show spantree disputedbpduthreshold
Usage
A disputed BPDU is one in which the flags field indicates a designated role and learning, and the
priority vector is worse than that already held by the port. If a disputed BPDU is received the port
is forced to the listening state. Refer to the 802.1Q‐2005 standard, IEEE Standard for Local and
Metropolitan Area Networks – Virtual Bridged Local Area Networks, for a full description of the
dispute mechanism, which prevents looping in cases of one‐way communication.
The disputed BPDU threshold is an integer variable that represents the number of disputed
BPDUs that must be received on a given port/SID until a disputed BPDU trap is sent and a syslog
message is issued. For example, if the threshold is 10, then a trap is issued when 10, 20, 30, and so
on, disputed BPDUs have been received.
If the value is 0, traps are not sent. The trap indicates port, SID and total Disputed BPDU count.
The default is 0.
Example
This example shows how to set the disputed BPDU threshold value to 5:
B3(rw)->set spantree disputedbpduthreshold 5
show spantree disputedbpduthreshold
Use this command to display the current value of the disputed BPDU threshold.
Syntax
show spantree disputedbpduthreshold
Parameters
None.
Defaults
None.
Mode
Switch command, read‐only.
Example
This example shows how to display the current disputed BPDU threshold:
B3(rw)->show spantree disputedbpduthreshold
The disputed BPDU threshold value is 0
clear spantree disputedbpduthreshold
Use this command to return the disputed BPDU threshold to its default value of 0, meaning that
disputed BPDU traps should not be sent.
Syntax
clear spantree disputedbpduthreshold
7-50 Spanning Tree Configuration
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