Configuring The Mcheck Variable Of A Port - 3Com Switch 7700 Configuration Manual

Configuring the mCheck
Variable of a Port
Table 19 Configure the Port Connection With the Point-to-point Link
Operation
Configure MSTP to automatically detect if the
port is directly connected with the
point-to-point link, as defaulted.
For more about the commands, see the Switch 7700 Command Reference Guide.
The ports connected with the point-to-point link, upon some port role conditions
being met, can transit to forwarding state rapidly through transmitting
synchronization packet, thus, reducing the unnecessary forwarding delay. If the
parameter is configured in auto mode, MSTP will automatically detect if the
current Ethernet port is connected with the point-to-point link.
For a link aggregation, only the master port can be configured to connect with the
point-to-point link. If a port in auto-negotiation mode operates in full-duplex
mode upon negotiation, it can be configured to connect with the point-to-point
link.
This configuration takes effect on the CIST and all the MSTIs. The settings of a port
determine whether or not the point-to-point link will be applied to all the STIs to
which the port belongs. Note that a temporary loop may be redistributed if you
configure a port not physically connected with the point-to-point link, rather,
connected to such a link by force.
By default, the parameter is configured as auto.
The port of an MSTP switch operates in either STP-compatible or MSTP mode.
If a port of an MSTP switch on a switching network is connected to an STP switch,
the port will automatically transition to operate in STP-compatible mode. The port
stays in STP-compatible mode and cannot automatically transition back to MSTP
mode when the STP switch is removed. In this case, you can perform an mCheck
operation to transit the port to MSTP mode by force.
You can use the following measures to perform mCheck operation on a port.
Configuring in system view
Perform the following configuration in system view.
Table 20 Configure the mCheck Variable of a Port
Operation
Perform mCheck operation on a port.
Configuring in Ethernet port view
Perform the following configuration in Ethernet port view.
Table 21 Configure the mCheck Variable of a Port
Operation
Perform mCheck operation on a port.
For more about the commands, see the Switch 7700 Command Reference Guide.
Configuring MSTP
Command
undo stp point-to-point
Command
stp interface interface-list mcheck
Command
stp mcheck
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