The Mcheck Configuration - Huawei Quidway S3900 Series Operation Manual

Operation Manual – MSTP
Quidway S3900 Series Ethernet Switches-Release 1510
You can configure port priorities according to actual networking requirements.
III. Configuration example
# Configure the port priority of Ethernet1/0/1 port in spanning tree instance 1 to be 16.
Configure in system view.
<Quidway> system-view
[Quidway] stp interface ethernet1/0/1 instance 1 port priority 16
Configure in Ethernet port view.
<Quidway> system-view
[Quidway] interface ethernet1/0/1
[Quidway-Ethernet1/0/1] stp instance 1 port priority 16
1.3.9 Point-to-point Link-Related Configuration
Refer to section 1.2.13 "Point-to-point Link-Related Configuration".
1.3.10 MSTP Configuration
Refer to section 1.2.14 "MSTP Configuration".

1.4 The mCheck Configuration

As mentioned previously, 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 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 operation 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.
1.4.1 Prerequisites
MSTP runs normally on the switch.
1.4.2 Configuration Procedure
You can perform the mCheck operation in the following two ways.
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Chapter 1 MSTP Configuration