3Com 10014298 manual Entering MST region view, Enter MST Region View, Stp region-configuration

190CHAPTER 8: STP OPERATION

■Configuring the Path Cost of a Port

■Configuring the Priority of a Port

■Configuring the Port Connection with the Point-to-Point Link

■Configuring the mCheck Variable of a Port

■Configuring the Switch Security Function

■Enabling MSTP on the Device

■Enabling or Disabling MSTP on a Port

■Displaying and Debugging MSTP

Only after MSTP is enabled on the device will other configurations take effect. Before enabling MSTP, you can configure the related parameters of the device and Ethernet ports. The configuration of the related parameters and Ethernet ports will take effect upon enabling MSTP, and stay effective even after resetting MSTP.

The display stp-region-configurationcommand shows the parameters that are configured before MSTP is enabled. To display parameters configured after MSTP is enabled, you can use the related display commands. For detailed information, see “Displaying and Debugging MSTP” on page 205.

You do not have to perform all these tasks to configure MSTP. Many of them are designed to adjust the MSTP parameters provided with default values. You can configure these parameters depending on your actual conditions or simply take the defaults. For more detailed information, refer to the task description or to the command descriptions in the Switch 7750 Command Reference Guide.

When GVRP and MSTP start up on the switch simultaneously, GVRP packets will propagate along CIST, which is a spanning tree instance. In this case, if you want to issue a certain VLAN through GVRP on the network, you should make sure that the VLAN is mapped to CIST when configuring the VLAN mapping table of MSTP. CIST is spanning tree instance 0.

Configuring the MST The MST region that a switch belongs to is determined with the configurations of Region for a Switch the region name, VLAN mapping table, and MSTP revision level. You can perform

the following configurations to put a switch into an MST region.

Tasks for configuring the MST Region for a Switch is described in the following sections:

■Entering MST region view

■Configuring the MST Region

■Activating the MST Region Configuration and Exiting the MST Region View

Entering MST region view

Perform the following configuration in system view.

Table 189 Enter MST Region View

Operation	Command
Enter MST region view (from system view)	stp region-configuration
Restore the default settings of MST region	undo stp	region-configuration