Performing Mcheck - HP A6600 Configuration Manual

To do...
3. Enter
interface
view or port
group view
4. Enable the MSTP feature for the
ports
To control MSTP flexibly, use the undo stp enable command to disable the MSTP feature for certain ports
so that they do not take part in spanning tree calculation and, thus, save the CPU resources of the device.

Performing mCheck

MSTP has three working modes: STP compatible mode, RSTP mode, and MSTP mode.
If a port on a device running MSTP (or RSTP) connects to a device running STP, this port automatically
migrates to the STP-compatible mode. However, it is not able to migrate automatically back to the MSTP
(or RSTP) mode, but remains working in the STP-compatible mode under the following circumstances:
The device running STP is shut down or removed.
•
The device running STP migrates to the MSTP (or RSTP) mode.
•
By then, you can perform an mCheck operation to force the port to migrate to the MSTP (or RSTP) mode.
Perform mCheck on a port through the following two approaches, which lead to the same result.
Performing mCheck globally
To perform global mCheck:
To do...
1. Enter system view
2. Perform mCheck
Performing mCheck in interface view
To perform mCheck in interface view:
To do...
1. Enter system view
2. Enter Ethernet interface view, or Layer
2 aggregate interface view
3. Perform mCheck
An mCheck operation takes effect on a device only when MSTP operates in RSTP or MSTP mode.
Use the command...
Enter Ethernet
interface view, or interface interface-type
Layer 2 aggregate interface-number
interface view
Enter port group port-group manual
view port-group-name
stp enable
Use the command...
system-view
stp mcheck
Use the command...
system-view
interface interface-type
interface-number
stp mcheck
68
Remarks
Required.
Use either command.
Optional.
By default, MSTP is enabled for
all ports after it is enabled for
the device globally.
Remarks
—
Required
Remarks
—
—
Required