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Spanning Tree Configuration Command Set
Configuring Spanning Tree Loop Protect Features
Matrix NSA Series Configuration Guide 6-139
6.2.3.18 set spantree disputedbpduthreshold
Use this command to set the disputed BPDU threshold, which is the number of disputed BPDUs
that must be received on a given port/SID until a disputed BPDU trap is sent.
set spantree disputedbpduthreshold value
Syntax Description
Command Defaults
None.
Command Type
Switch command.
Command Mode
Read-Write.
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.
value Specifies the number of disputed BPDUs that must be
received on a given port/SID to cause a disputed BPDU trap
to be sent.
A threshold of 0 indicates that traps should not be sent. The
default value is 0.