3com 8807 Reference Guide
190
C
HAPTER
13: MSTP C
ONFIGURATION
C
OMMANDS
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
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.
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.
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.
n
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.
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.
Example
# Set the mcheck parameter of Ethernet2/1/3 in system view.
<SW8800>system-view
System View: return to User View with Ctrl+Z.
[SW8800] stp interface Ethernet2/1/3 mcheck
stp interface
no-agreement-check
Syntax
stp interface interface-type interface-number no-agreement-check
undo stp interface interface-type interface-number no-agreement-check
View
System view
Parameter
interface-type: Port type.
interface-number: Port number.
Description
Use the stp interface no-agreement-check command to enable port fast
transition.
transition.