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Item Descri

tion

Mode

Set the STP operating 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.

After you set the network diameter, you cannot set the timers. Instead, the

device automatically calculates the forward delay, hello time, and max age.

When you configure the bridge diameter, follow these guidelines:

• The network diameter applies to only the CIST. 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.

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