H3C Technologies H3C WX3000 Series Unified Switches - Manual (Page 202)

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Enabling MSTP
Refer to Enabling MSTP .
Performing mCheck Operation
Ports on an MSTP-enabled device can operate in three modes: STP-compatible, RSTP-compatible,
and MSTP.
A port on an MSTP-enabled device operating as an upstream device transits to the STP-compatible
mode when it has an STP-enabled device connected to it. When the STP-enabled downstream device
is then replaced by an MSTP-enabled device, the port cannot automatically transit to the MSTP mode.
It remains in the STP-compatible mode. In this case, you can force the port to transit to the MSTP mode
by performing the mCheck operation on the port.
Similarly, a port on an RSTP-enabled device operating as an upstream device turns to the
STP-compatible mode when it has an STP-enabled device connected to it. When the STP enabled
downstream device is then replaced by an MSTP-enabled device, the port cannot automatically transit
to the RSTP mode. It remains in the STP-compatible mode. In this case, you can force the port to transit
to the RSTP mode by performing the mCheck operation on the port.
Configuration Prerequisites
MSTP runs normally on the device.
Configuration Procedure
You can perform the mCheck operation in the following two ways.
Perform the mCheck operation in system view
Follow these steps to perform the mCheck operation in system view:
To do… Use the command… Remarks
Enter system view system-view —
Perform the mCheck operation
stp [ interface interface-list ]
mcheck
Required
Perform the mCheck operation in Ethernet port view
Follow these steps to perform the mCheck operation in Ethernet port view:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet port view
interface interface-type
interface-number
—
Perform the mCheck operation stp mcheck Required
Configuration Example
# Perform the mCheck operation on GigabitEthernet 1/0/1.
1) Perform this configuration in system view