3com 3.01.01 用户手册

For more about the commands, see the Switch 8800 Command Reference Guide.

The ports connected with the point-to-point link, upon some port role conditions 
being met, can transit to forwarding state rapidly through transmitting 
synchronization packet, thus, reducing the unnecessary forwarding delay. If the 
parameter is configured in auto mode, MSTP will automatically detect if the 
current Ethernet port is connected with the point-to-point link. 

This configuration takes effect on the CIST and all the MSTIs. The settings of a port 
determine whether or not the point-to-point link will be applied to all the STIs to 
which the port belongs. Note that a temporary loop may be redistributed if you 
configure a port not physically connected with the point-to-point link, rather, 
connected to such a link by force. 

By default, the parameter is configured as auto. 

The port of an MSTP switch operates in either STP-compatible or MSTP mode. 

If a port of an MSTP switch on a switching network is connected to an STP switch, 
the port will automatically transition to operate in STP-compatible mode. The port 
stays in STP-compatible mode and cannot automatically transition back to MSTP 
mode when the STP switch is removed. In this case, you can perform an mCheck 
operation to transit the port to MSTP mode by force. 

You can use the following measures to perform mCheck operation on a port. 

Perform the following configuration in system view. 

Perform the following configuration in Ethernet port view. 

For more about the commands, see the Switch 8800 Command Reference Guide.

Configure MSTP to automatically detect if the 
port is directly connected with the 
point-to-point link, as defaulted.

undo stp point-to-point

Table 19   Configure the Port Connection With the Point-to-point Link

Table 20   Configure the mCheck Variable of a Port

Perform mCheck operation on a port.

stp interface interface-list mcheck

Table 21   Configure the mCheck Variable of a Port

Perform mCheck operation on a port.