Operation Manual – MSTP
H3C S3100 Series Ethernet Switches Chapter 1 MSTP Configuration
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1.4.10 Enabling MSTP
Refer to section 1.3.14 “Enabling MSTP”.
1.5 Performing mCheck Operation
Ports on an MSTP-enabled switch can operate in three modes: STP-compatible,
RSTP-compatible, and MSTP.
A port on an MSTP-enabled switch operating as an upstream switch transits to the
STP-compatible mode when it has an STP-enabled switch connected to it. When the
STP-enabled downstream switch is then replaced by an MSTP-enabled switch, 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 switch operating as an upstream switch turns to
the STP-compatible mode when it has an STP-enabled switch connected to it. When
the STP enabled downstream switch is then replaced by an MSTP-enabled switch, 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.
1.5.1 Configuration Prerequisites
MSTP runs normally on the switch.
1.5.2 Configuration Procedure
You can perform the mCheck operation in the following two ways.
I. Perform the mCheck operation in system view
Table 1-34 Perform the mCheck operation in system view
Operation Command Description
Enter system view
system-view
—
Perform the mCheck
operation
stp [ interface interface-list ]
mcheck
Required
II. Perform the mCheck operation in Ethernet port view
Table 1-35 Perform the mCheck operation in Ethernet port view
Operation Command Description
Enter system view
system-view
—
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