3Com S7906E Command Reference Manual page 414

View
Any view
Default Level
1: Monitor level
Parameters
instance instance-id: Displays the spanning tree information of a particular MSTI. The value of
instance-id ranges from 0 to 31. The minimum value is 0, representing the common internal spanning
tree (CIST).
interface interface-list: Specifies an Ethernet port list, in the format of interface-list = { interface-type
interface-number [ to interface-type interface-number ] }&<1-10>, where &<1-10> indicates that you
can specify up to 10 ports or port ranges.
slot slot-number: Displays the spanning tree information of the card on the specified slot.
brief: Displays brief information.
Description
Use the display stp command to view the MSTP status information and statistics information.
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 MSTI ID or port list, this command will display the MSTP information on all
ports. The displayed information is sequenced by MSTI ID and by port name in each MSTI.
If you specify an MSTI ID, this command will display the MSTP information on all ports in that MSTI.
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 MSTI ID, and by port name in each MSTI.
If you specify both an MSTI ID and a port list, this command will display the MSTP information on
the specified ports in the specified MSTI.
The MSTP status information includes:
CIST global parameters: Protocol work mode, device priority in the CIST (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, and
whether rapid state transition enabled (designated ports).
MSTI global parameters: MSTI ID, bridge priority of the MSTI, 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, and whether rapid state transition enabled (for designated ports).
The statistics information includes:
1-3