3Com Baseline 2928 PWR Plus User Manual page 224

Figure 1-8 Configure MSTP globally
Table 1-9 describes the configuration items of configuring MSTP globally.
Table 1-9 Configuration items of configuring MSTP globally
Item
Enable STP Globally
BPDU Guard
Mode
Max Hops
Path Cost Standard
Select whether to enable STP globally.
Other MSTP configurations take effect only after you enable STP globally.
Select whether to enable BPDU guard
BPDU guard can protect the device from malicious BPDU attacks, thus
making the network topology stable.
Set the working mode of STP, which can be STP, RSTP, or MSTP.
STP: Each port on a device sends out STP BPDUs.
RSTP: Each port on a device sends out RSTP BPDUs, and
automatically migrates to STP-compatible mode when detecting that it is
connected with a device running STP.
MSTP: Each port on a device sends out MSTP BPDUs, and
automatically migrates to STP-compatible mode when detecting that it is
connected with a device running STP.
The working mode is RSTP by default.
Set the maximum number of hops in an MST region to restrict the region
size.
The setting can take effect only when it is configured on the regional root
bridge.
Specify the standard for path cost calculation. It can be Legacy, IEEE
802.1D-1998, or IEEE 802.1T.
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Description