3Com 5500-EI PWR Reference Manual page 254

stp mcheck
System view:
stp [ interface interface-list ] mcheck
View
System view, Ethernet port view
Parameters
interface-list: Ethernet port list. You can specify multiple Ethernet ports by providing this argument in the
form of interface-list = { interface-type interface-number [ to interface-type interface-number ] } &<1-10>,
where &<1-10> means that you can provide up to 10 port indexes/port index ranges for this argument.
Description
Use the stp mcheck command to perform the mCheck operation on the current port in Ethernet
port view.
Use the stp interface mcheck command to perform the mCheck operation on specified port(s) in
system view. If the value of interface interface-list is not specified, this command performs the
mCheck operation on all MSTP-enabled ports of the device.
When a port on an MSTP-enabled/RSTP-enabled upstream switch connects with an STP-enabled
downstream switch, the port operates in the STP-compatible mode automatically. 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 still 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.
Related commands: stp mode.
Examples
# Perform the mCheck operation on Ethernet 1/0/1.
Perform the mCheck operation on Ethernet 1/0/1 in Ethernet port view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] interface Ethernet 1/0/1
[Sysname-Ethernet1/0/1] stp mcheck
Perform the mCheck operation on Ethernet 1/0/1 in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp interface Ethernet 1/0/1 mcheck
# Perform the mCheck operation on Ethernet 1/0/2 to Ethernet 1/0/4 in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp interface Ethernet 1/0/2 to Ethernet 1/0/4 mcheck
# Perform the mCheck operation on all the MSTP-enabled ports of your switch in system view.
<Sysname> system-view
System View: return to User View with Ctrl+Z.
[Sysname] stp mcheck
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