3com 8807 Reference Guide

Any view

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.

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,