Command Manual - STP
Quidway S6500 Series Ethernet Switches Chapter 1 MSTP Configuration Commands
Huawei Technologies Proprietary
1-17
[Quidway] stp interface Ethernet2/0/1 loop-protection
1.1.18 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_num | interface_name } [ to { interface_type
interface_num | interface_name } ] }&<1-10>. For detail descriptions of interface_type,
interface_num and interface_name 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
Using stp interface mcheck command, you can 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.
The switch defaults to operate in MSTP mode. It is an RSTP- and STP-compatible
mode, that is, the switch in MSTP mode can identify the BPDU packets of MSTP and
the Config BPDU packets of RSTP. However, the switch in STP mode can only identify
the Config BPDU packets from both MSTP and RSTP bridges. If the switch in
STP-compatible mode transits back to MSTP mode, but you do not execute the stp
mcheck command, it cannot send the BPDU packets of MSTP and the devices
connecting to it still send the Config BPDU (BPDU of STP) packets toward it, thus
causing the packets from the devices with the same configuration not to be in the same
domain. Therefore, execute the stp interface mcheck command in system view when
you have changed the STP mode.
For the related command, see stp mcheck, stp mode.
Example
# Set mcheck parameter of Ethernet2/0/3 in system view.
[Quidway] stp interface Ethernet2/0/3 mcheck
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