Enabling The Spanning Tree Feature In Pvst Mode; Performing Mcheck; Configuration Restrictions And Guidelines; Performing Mcheck Globally - HPE FlexFabric 5940 Series Configuration Manual

Enabling the spanning tree feature in PVST mode

Step
Enter system view.
1.
Enable the spanning tree
2.
feature.
Enable the spanning tree
3.
feature in VLANs.
Enter Layer 2 Ethernet
4.
interface or Layer 2
aggregate interface view.
Enable the spanning tree
5.
feature on the port.

Performing mCheck

The mCheck feature enables user intervention in the port status transition process.
When a port on an MSTP, RSTP, or PVST device connects to an STP device and receives STP
BPDUs, the port automatically transits to the STP mode. However, the port cannot automatically
transit back to the original mode when the following conditions exist:
•
The peer STP device is shut down or removed.
•
The port cannot detect the change.
To forcibly transit the port to operate in the original mode, you can perform an mCheck operation.
For example, Device A, Device B, and Device C are connected in sequence. Device A runs STP,
Device B does not run any spanning tree protocol, and Device C runs RSTP, PVST, or MSTP. In this
case, when Device C receives an STP BPDU transparently transmitted by Device B, the receiving
port transits to the STP mode. If you configure Device B to run RSTP, PVST, or MSTP with Device C,
you must perform mCheck operations on the ports interconnecting Device B and Device C.

Configuration restrictions and guidelines

The mCheck operation takes effect on devices operating in MSTP, PVST, or RSTP mode.

Performing mCheck globally

Step
Enter system view.
1.
Perform mCheck.
2.
Command
system-view
stp global enable
stp vlan vlan-id-list enable
interface interface-type
interface-number
stp enable
Command
system-view
stp global mcheck
119
Remarks
N/A
When the device starts up with
initial settings, the spanning tree
feature is globally disabled.
When the device starts up with
factory defaults, the spanning tree
feature is globally enabled.
For more informaiton about the
initial settings and factory
defaults, see Fundamentals
Configuration Guide.
By default, the spanning tree
feature is enabled in VLANs.
N/A
By default, the spanning tree
feature is enabled on all ports.