Specifications

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Item Meaning Displayed information
BpduFilter BPDU filter ON: The BPDU filter functionality is being applied.
OFF: The BPDU filter functionality is not being used.
Hello Time Interval for sending and
receiving BPDUs on the
port
For the root port, alternate port, and backup port,
the value on the partner device is displayed.
For the designated port, the value on the Switch is
displayed.
Root Guard Root guard functionality ON: The root guard functionality is being applied.
ON(Blocking): Displayed when root guard
functionality is running and the port is blocked.
(All MSTIs on the applicable ports change to
blocking status.)
OFF: The root guard functionality is not being used.
BPDU Parameters Information about received
BPDUs on the port.
The last time a BPDU was
received is displayed
enclosed with
parentheses.
Displays information about the BPDUs received at
the CIST or MST instance port.
This item is not displayed if BPDUs are not
received.
The BPDU information whose Mode Version is
STP or Rapid STP is displayed only by CIST.
Protocol Version Protocol versions Displays the protocol version of the received
BPDUs.
STP(IEEE802.1D):
Indicates that BPDUs in which the protocol
version is set to STP (IEEE 802.1D) were
received from neighboring devices.
Rapid STP(IEEE802.1w):
Indicates that BPDUs in which the protocol
version is set to RSTP (IEEE 802.1W) were
received from neighboring devices.
MSTP(IEEE802.1s):
Indicates that BPDUs in which the protocol
version is set to MSTP (IEEE 802.1s) were
received from neighboring devices.
Root Root bridge information
stored in the BPDU
If Protocol Version is MSTP, information about
the CIST root bridge is displayed. This item is not
displayed for MST instance 1 or later instances.
If Mode Version is STP or Rapid STP, information
about the root bridge is displayed.
Priority Bridge priority 0 to 65535
The lower the value, the higher the priority.
MAC MAC address MAC address of the root bridge that sent BPDUs
External Root Cost External root path cost If Protocol Version is MSTP, information about
the CIST root path cost is displayed. This item is not
displayed for MST instance 1 or later instances.
If Mode Version is STP or Rapid STP, information
about the root path cost is displayed.