HP V1910 User Manual page 205

Item
Mode
Max Hops
Path Cost Standard
Bridge Diameter
Forward
Delay
Hello Time
Timer
Max Age
Instance ID
Root Type
Instance
Bridge
Priority
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
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. 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.
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.
Set the delay for the root and designated
ports to transit to the forwarding state.
Set the interval at which the device sends
hello packets to the surrounding devices to
ensure that the paths are fault-free.
Set the maximum length of time a
configuration BPDU can be held by the
device.
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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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.