Specifications

show spanning-tree statistics
256
Item Meaning Displayed information
TxBPDUs Number of sent BPDUs --
RxBPDUs Number of received
BPDUs
--
Forward Transit Times Number of transitions to
the forwarding state
--
RxDiscard BPDUs Number of discarded
received BPDUs
--
(Displayed only for MST instance 0.)
Discard BPDUs by reason Number of discarded
received BPDUs
--
(Displayed only for MST instance 0.)
Timeout Number of BPDUs whose
valid time expired
Displays the number of received BPDUs whose
valid time (which is set in the BPDUs) expired.
(Displayed only for MST Instance ID:0)
Invalid Number of invalid BPDUs Displays the number of received BPDUs whose
format is invalid (this item is displayed only for MST
instance 0).
When the length of the configured BPDU is less
than 35 octets
When the length of the TCN BPDU is less than 4
octets
When the length of the RST BPDU is less than 36
octets
When the length of the MST BPDU is less than 35
octets
When the Version 3 Length value of the MST BPDU
is less than 64
Not Support Number of unsupported
BPDUs
Displays the number of received BPDUs that
include unsupported parameters (this item is
displayed only for MST instance 0).
When the BPDU type value is other than 0x00,
0x02, or 0x80
Other Number of BPDUs
discarded for another
reason
Displays the number of discarded received BPDUs
when PVST+ BPDUs are received or when BPDU
discard has been configured.
- When BPDU filtering has been configured
- When the root guard functionality is operating
(Displayed only for MST Instance ID:0)
Discard Message MSTI configuration
message when the
received BPDUs are
discarded
Displays the number of MSTI configuration
messages when BPDU discard has set by the
following functionality:
- When the root guard functionality is set
(Displayed only for MST instances 1 to 4095.)
Ver3Length Invalid Number of received
BPDUs whose Version 3
Length value is invalid
Displays the number of received BPDUs whose
Version 3 Length value is invalid.
- When the value is less than 64
- When the value is 1089 or more
- When the value is not a multiple of 16