3Com Switch 7750 Configuration Guide

264 CHAPTER 30: MSTP CONFIGURATION
MSTP-enabled switch, the port cannot automatically transit to the MSTP operation
mode. It 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.
Prerequisites MSTP runs normally on the switch.
Configuration Procedure You can perform the mCheck operation in the following two ways.
Performing the mCheck operation in system view
Performing the mCheck operation in Ethernet port view
Configuration Example # Perform the mCheck operation on Ethernet1/0/1 port
■ Configure in system view.
<SW7750> system-view
[SW7750] stp interface ethernet1/0/1 mcheck
■ Configure in Ethernet port view.
<SW7750> system-view
[SW7750] interface ethernet1/0/1
[SW7750-Ethernet1/0/1] stp mcheck
Protection Function
Configuration
Introduction The following protection functions are available on an MSTP-enabled switch:
BPDU protection, root protection, loop guard, and topology change BPDU
(TC-BPDU) attack guard.
BPDU protection
Normally, the access ports of the devices operating on the access layer directly
connect to terminals (such as PCs) or file servers. These ports are usually
configured as edge ports to achieve rapid transition. But they resume non-edge
ports automatically upon receiving configuration BPDUs, which causes spanning
tree regeneration and network topology jitter.
Table 196 Perform the mCheck operation in system view
Operation Command Description
Enter system view System-view -
Perform the mCheck
operation
stp [ interface interface-list ] mcheck Required
Table 197 Perform the mCheck operation in Ethernet port view
Operation Command Description
Enter system view system-view -
Enter Ethernet port view interface interface-type
interface-number
-
Perform the mCheck operation stp mcheck Required