3Com Switch 7750 Series
Command Reference Guide – MSTP Chapter 1 MSTP Configuration Commands
1-30
1.1.28 stp mcheck Syntax
stp mcheck
View
Ethernet port view
Parameter
None
Description
Use the stp mcheck command to perform the mCheck operation on the current port.
When a port on an MSTP-enabled upstream switch connects with an STP enabled
downstream switch, the port transits to the STP-compatible mode. But when the STP
enabled downstream switch is then replaced by an MSTP-enabled switch, the port
cannot automatically transit to the MSTP mode but remains in the STP-compatible
mode. In this case, you can force the port to transit to the MSTP mode by performing
the mCheck operation on the port.
Similarly, when a port on an RSTP-compatible upstream switch connects with an
STP-enabled downstream switch, the port transits to the STP-compatible mode. But
when the STP enabled downstream switch is then replaced by an MSTP-enabled
switch, the port cannot automatically transit to the MSTP mode but remains in the
STP-compatible mode. In this case, you can force the port to transit to the
MSTP-compatible mode by performing the mCheck operation on the port.
Related command: stp mode, stp interface mcheck.
Example
# Perform the mCheck operation for Ethernet1/0/1 port.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] interface Ethernet1/0/1
[3Com-Ethernet1/0/1] stp mcheck
1.1.29 stp mode Syntax
stp mode { stp | rstp | mstp }
undo stp mode