Performing Mcheck - 3Com Switch 4800G 24-Port Configuration Manual

228 C 23: MSTP C
HAPTER
Enabling the MSTP
Feature

Performing mCheck

Configuration
Prerequisites
Configuration Procedure
Configuration Example
ONFIGURATION
Refer to "Enabling the MSTP Feature" on page 224 in the section about root
bridge configuration.
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.
MSTP has been correctly configured on the device.
Performing mCheckglobally
Follow these steps to perform global mCheck:
To do...
Enter system view
Perform mCheck
Performing mCheck in Ethernet interface view
Follow these steps to perform mCheck in Ethernet interface view:
To do...
Enter system view
Enter Ethernet interface view
Perform mCheck
c
CAUTION: The stp mcheck command is meaningful only when the device works
in the MSTP (or RSTP) mode, not in the STP-compatible mode.
# Perform mCheck on port GigabitEthernet 1/0/1.
1 Method 1: Perform mCheck globally.
<Sysname> system-view
[Sysname] stp mcheck
2 Method 2: Perform mCheck in Ethernet interface view.
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp mcheck
Use the command...
system-view
stp mcheck
Use the command...
system-view
interface interface-type interface-number
stp mcheck
Remarks
-
Required
Remarks
-
-
Required