H3C Technologies H3C SecPath F1000-E - Manual (Page 97)

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Item Description
BPDU Protection
Whether to enable BPDU guard globally:
• Enable—Enables BPDU guard globally.
• Disable—Disables BPDU guard globally.
BPDU guard can protect the device from malicious BPDU attacks,
making the network topology stable.
Mode
STP can operate in STP mode, RSTP mode, or MSTP mode.
• STP mode—All ports of the device send out STP BPDUs.
• RSTP mode—All ports of the device send out RSTP BPDUs. If the
device detects that it is connected to a legacy STP device, the port
connecting to the legacy STP device will automatically migrate to
STP-compatible mode.
• MSTP—All ports of the device send out MSTP BPDUs. If the device
detects that it is connected to a legacy STP device, the port
connecting to the legacy STP device will automatically migrate to
STP-compatible mode.
Max Hops
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.
Path Cost Standard
Specify the standard for path cost calculation. It can be Legacy, IEEE
802.1D-1998, or IEEE 802.1T.
Bridge Diameter
Any two stations in a switched network are interconnected through a
specific path composed of a series of devices. The bridge diameter (or
the network diameter) is the number of devices on the path composed of
the most devices.
IMPORTANT:
• The network diameter applies to only the CIST, and not to MSTIs. It
takes effect only after you configure it on the root bridge. Each MST
region is regarded as a device.
• After you set the network diameter, you cannot set the timers.
Instead, the device calculates the forward delay, hello time, and max
age automatically.