HP E4510-48G, Command Reference Manual

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4-4
Default Level
1: Monitor level
Parameters
instance instance-id : Displays the status and statistics information of a particular MSTI. The minimum
value of instance-id is 0, representing the common internal spanning tree (CIST), and the maximum
value of instance-id is 32.
interface interface-list : Displays the MSTP status and statistics information on the ports specified by a
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 specified IRF member device. The
slot-number argument is the member number of the device in the IRF, which you can display with the
display irf command. The value range for the slot-number argument depends on the number of
members and numbering conditions in the current IRF. If no IRF exists, the slot-number argument is
the current device number.
brief : Displays brief MSTP status and statistics information.
Description
Use the display stp command to view the MSTP status and statistics information.
Based on the MSTP status and statistics information, you can analyze and maintain the network
topology or check whether MSTP is working normally.
Note that:
z
If you do not specify any MSTI or port, this command will display the MSTP information of all
MSTIs on all ports. The displayed information is sorted by MSTI ID and by port name in each
MSTI.
z
If you specify an MSTI but not a port, this command will display the MSTP information on all ports
in that MSTI. The displayed information is sorted by port name.
z
If you specify some ports but not an MSTI, this command will display the MSTP information of all
MSTIs on the specified ports. The displayed information is sorted by MSTI ID, and by port name in
each MSTI.
z
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 displayed information is sorted by port name.
The MSTP status information includes:
z
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).
z
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 for designated ports.