3Com 4200G 12-Port - Specifying Whether the Link Connected to a Port Is a Point-To-Point Link; Enabling MSTP; Performing Mcheck Operation; Configuration Prerequisites

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[Sysname] stp interface GigabitEthernet 1/0/1 instance 1 port priority 16
2) Perform this configuration in Ethernet port view
<Sysname> system-view
[Sysname] interface GigabitEthernet 1/0/1
[Sysname-GigabitEthernet1/0/1] stp instance 1 port priority 16
Specifying Whether the Link Connected to a Port Is a Point-to-point Link
Refer to Specifying Whether the Link Connected to a Port Is Point-to-point Link.
Enabling MSTP
Refer to Enabling MSTP.
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 MSTP-compatible mode. It remains in the STP-compatible mode. In this case, you can force the
port to transit to the MSTP-compatible mode by performing the mCheck operation on the port.
Configuration Prerequisites
MSTP runs normally on the switch.
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: