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MSTP Configuration Commands 173
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Parameter
instance-id : Specifies the spanning tree instance ID, ranging from 0 to 48. Instance
0 represents CIST.
interface-list : Ethernet port list, containing multiple Ethernet ports and expressed
as interface-list = { { interface-type interface-num | interface-name } [ to {
interface-type interface-num | interface-name } ] }&<1-10>. For detail descriptions
of interface-type , interface-num and interface-name parameters, refer to the
corresponding descriptions in Port Command Manual . &<1-10> means that the
preceding parameters can be entered up to 10 times.
slot slot-num : Displays STP information about a specified slot.
brief : Displays only port state, port protection type and port role in the
corresponding instance.
Description
Use the display stp command to view the state information and statistics
information of the spanning tree.
The MSTP state and statistics information can help analyze and maintain the
network topology and maintain the normal operation of MSTP.
If no spanning tree instance ID or port list is specified, the command will display
the spanning tree information of all the instances on all the ports in port number
order. If the instance ID is specified, the command will display the spanning tree
information of the specified instance on all the port in port number order. If only
the port list is specified, the command will display the information about all the
MSTIs on the port in port number order. If both instance ID and port list are
specified, the command will display the spanning tree information of the specified
instance and port according to the port list of the instance ID.
If there is an aggregation port, the command will only display the instance
information on the master port.
MSTP state information includes:
1 Global CIST parameter: Protocol operation mode, switch priority in the CIST
instance, MAC address, Hello Time, Max Age, Forward Delay, Max Hops, CIST
common root, external path cost of the switch to the CIST common root, region
root, internal path cost of the switch to the region root, CIST root port of the
switch, and whether to enable BPDU protection; Number of received TC/TCN
packets, time interval for receiving packets. If you specify the relationship between
a master root and one or multiple slave roots, the global CIST parameters can also
be displayed in CIST Root Type.
2 CIST port parameter: Port state, role, priority, path cost, path cost standard
designated bridge, designated port, edge port/non-edge port, whether connected
to the point-to-point link, port transit limit, whether to enable Root protection,
whether being a region edge port, Hello Time, Max Age, Forward Delay,