H3C Technologies H3C SecPath F1000-E - Manual (Page 121)

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Enabling the spanning tree feature
You must enable the spanning tree feature for the device before any other spanning tree related
configurations can take effect. In STP/RSTP/MSTP mode, make sure that the spanning tree feature is
enabled globally and on the desired ports.
To enable the spanning tree feature:
Step Command Remarks
1. Enter system view. system-view N/A
2. Enable the spanning tree feature
globally.
stp enable
Whether the spanning tree
feature is enabled globally or on
VLANs by default depends on
your device model.
3. Enter Ethernet interface view or
Layer 2 aggregate interface view.
interface interface-type
interface-number
N/A
4. Enable the spanning tree feature for
the port or group of ports.
stp enable
Optional.
By default, the spanning tree
feature is enabled for all ports.
NOTE:
•
To globally enable or disable the spanning tree feature, use the stp enable command or undo stp
enable command in system view. To enable or disable the spanning tree feature for specific VLANs, use
the stp vlan enable command or undo stp vlan enable command.
• You can disable the spanning tree feature for certain ports with the undo stp enable command to
exclude them from spanning tree calculation and save CPU resources of the device.
Performing mCheck
If a port on a device running MSTP or RSTP connects to an STP device, this port will automatically
transition to the STP-compatible mode. However, it cannot automatically transition back to the original
mode when:
• The STP device is shut down or removed.
• The STP device transitions to the MSTP or RSTP mode.
To forcibly transition the port to operate in the original mode, you can perform an mCheck operation.
The following methods for performing mCheck produce the same result.
Performing mCheck globally
Step Command
1. Enter system view. system-view
2. Perform mCheck. stp mcheck