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Based on the MSTP status information and statistics information, you can analyze
and maintain the network topology or check whether MSTP is working normally.
Note that:
■ If you do not specify any MST instance ID or port list, this command will display
the MSTP information on all ports. The displayed information is sequenced by
MST instance ID and by port name in each MST instance.
■ If you specify an MST instance ID, this command will display the MSTP
information on all ports in that MST instance. The displayed information is
sequenced by port name.
■ If you specify a port list, this command will display the MSTP information on
the specified ports. The displayed information is sequenced by MST instance ID,
and by port name in each MST instance.
■ If you specify both an MST instance ID and a port list, this command will display
the MSTP information of the specified MST instance on the specified ports.
The MSTP status information includes:
■ CIST global parameters: Protocol work mode, device priority in the CIST
instance (Priority), MAC address, hello time, max age, forward delay, maximum
hops, common root of the CIST, external path cost from the device to the CIST
common root, regional root, the internal path cost from the device to the
regional root, CIST root port of the device, and status of the BPDU guard
function (enabled or disabled).
■ CIST port parameters: Port status, role, priority, path cost, designated bridge,
designated port, edge port/non-edge port, whether connecting to a
point-to-point link, maximum transmission rate (transmit limit), status of the
root guard function (enabled or disabled), BPDU format, boundary
port/non-boundary port, hello time, max age, forward delay, message age,
remaining hops, whether a port in an aggregation group, and whether rapid
state transition enabled (designated ports).
■ MSTI global parameters: MSTI instance ID, bridge priority of the instance,
regional root, internal path cost, MSTI root port, and master bridge.
■ MSTI port parameters: Port status, role, priority, path cost, designated bridge,
designated port, remaining hops, whether a port in an aggregation group, and
whether rapid state transition enabled (for designated ports).
The statistics information includes:
■ The number of TCN BPDUs, configuration BPDUs, RST BPDUs and MST BPDUs
sent from each port
■ The number of TCN BPDUs, configuration BPDUs, RST BPDUs, MST BPDUs and
wrong BPDUs received on each port
■ The number of BPDUs discarded on each port
Related commands: reset stp.
Examples # View the MSTP status information and statistics information.