3Com Switch 8800 Advanced Software V5 Configuration Guide

124 CHAPTER 11: MSTP CONFIGURATION
Configuration example
# Set the priority of port Ethernet 1/1/1 to 16 in MST instance 1.
<Sysname> system-view
[Sysname] interface ethernet 1/1/1
[Sysname-Ethernet1/1/1] stp instance 1 port priority 16
Configuring Whether
Ports Connect to
Point-to-Point Links
Refer to “Configuring Whether Ports Connect to Point-to-Point Links” on page
118..
Configuring the MSTP
Packet Format for Ports
Refer to “Configuring the MSTP Packet Format for Ports” on page 118.
Enabling the MSTP
Feature
Refer to “Enabling the MSTP Feature” on page 119.
Performing mCheck Ports on an MSTP-compliant device have three working modes: STP compatible
mode, RSTP mode, and MSTP mode.
In a switched network, if a port on the device running MSTP (or RSTP) connects to
a device running STP, this port will automatically migrate to the STP-compatible
mode. However, if the device running STP is removed, this will not be able to
migrate automatically to the MSTP (or RSTP) mode, but will remain working in the
STP-compatible mode. In this case, you can perform an mCheck operation to force
the port to migrate to the MSTP (or RSTP) mode.
You can perform mCheck on a port through two approaches, which lead to the
same result.
Configuration prerequisites
MSTP has been correctly configured on the device.
Perform global mCheck
Follow these steps to perform global mCheck:
Perform mCheck in Ethernet interface view
Follow these steps to perform mCheck in Ethernet interface view:
To do... Use the command... Remarks
Enter system view system-view -
Perform mCheck stp mcheck Required
To do... Use the command... Remarks
Enter system view system-view -
Enter Ethernet interface view interface interface-type
interface-number
-
Perform mCheck stp mcheck Required