Stp Mcheck - Huawei Quidway S8500 Series Command Manual

Command Manual – STP
Quidway S8500 Series Routing Switches
Example
# Set the Max Hops of an MST region to 35.
<Quidway>system-view
System View: return to User View with Ctrl+Z.
[Quidway] stp max-hops 35

1.1.28 stp mcheck

Syntax
stp mcheck
View
Ethernet port view
Parameter
None
Description
Use the stp mcheck command to perform mCheck on the current port.
If a port of an MSTP switch on a switching network has ever been connected to an STP
switch, the port will automatically transit to operate in STP-compatible mode. However,
when the STP switch is removed, the port stays in STP-compatible mode and cannot
automatically transit back to MSTP mode. In this case, you can perform mCheck
operation to transit the port to MSTP mode by force.
Note:
By default, MSTP runs in MSTP mode, which is compatible with RSTP and STP (This
mode can recognize MSTP BPDU, STP config BPDU and RSTP config BPDU).
However, the STP switch can only recognize config BPDU (STP BPDU) sent by the
STP and RSTP bridges. After the switch running STP-compatible mode switches back
to MSTP mode, it will not send MSTP BPDU if you do not execute the stp mcheck
command. Therefore, the connected device still sends config BPDU (STP BPDU) to it,
causing the same configuration exist in different regions and other problems.
Remember to perform stp interface mCheck after modifying stp mode.
Related command: stp mode, stp interface mcheck.
Example
# Set mcheck parameter for Ethernet2/1/1.
Huawei Technologies Proprietary
1-30
Chapter 1 MSTP Configuration Commands