Item

Description

 

Set the STP working mode:

 

∙ 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

Mode

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.

 

 

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. Options include Legacy, IEEE

802.1D-1998, and IEEE 802.1T.

 

 

 

 

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.

Bridge Diameter

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

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

 

IMPORTANT:

 

∙ The configured network diameter is effective only for the CIST, not for MSTIs.

 

∙ The bridge diameter cannot be configured together with the timers.

 

Forward

Set the delay for the root and designated

 

Delay

ports to transit to the forwarding state.

 

 

 

 

 

Set the interval at which the device sends

 

Hello Time

hello packets to the surrounding devices to

 

 

ensure that the paths are fault-free.

 

 

 

Timer

 

 

 

Set the maximum length of time a

 

Max Age

configuration BPDU can be held by the

 

 

device.

IMPORTANT:

∙The settings of hello time, forward delay, and max age must meet a certain formula. Otherwise, the network topology will not be stable. HP recommends you set the network diameter and then have the device automatically calculate the timers.

∙The bridge diameter cannot be configured together with the timers.

 

Instance ID

 

 

Instance

Root Type

 

 

 

 

Bridge

 

Priority

Set the role of the device in the MSTI or the bridge priority of the device, which is one of the factors determining whether the device can be elected as the root bridge.

Roles of the device in the MSTI include:

∙Not Set—The device role is not set. You can set the bridge priority of the device when selecting this role.

∙Primary—Configure the device as the root bridge. You cannot set the bridge priority of the device when selecting this role.

∙Secondary—Configure the device as a secondary root bridge. You cannot set the bridge priority of the device when selecting this role.

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