Command Manual – STP
Quidway S8500 Series Routing Switches Chapter 1
MSTP Configuration Commands
Huawei Technologies Proprietary
1-24
<Quidway>system-view
System View: return to User View with Ctrl+Z.
[Quidway] stp interface Ethernet2/1/1 loop-protection
1.1.22 stp interface mcheck
Syntax
stp interface interface-list mcheck
View
System view
Parameter
interface-list: Ethernet port list, containing multiple Ethernet ports and expressed as
interface-list = { interface-type interface-number [ to interface-type
interface-number ] }&<1-10>. For detail descriptions of interface-type and
interface-number parameters, refer to the corresponding descriptions in Port
Command Manual. &<1-10> means that the preceding parameters can be entered up
to 10 times
Description
Use the stp interface mcheck command to perform mCheck operation on the port in
system view.
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 mcheck, stp mode.
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