RSTP

1

From the Link150 menu bar, click Settings.

Opens the Settings menu.

2

From the Settings menu, in the Redundancy submenu, click RSTP.

Opens the RSTP page.

Enable

Allows you to enable or disable RSTP bridge and port settings.

-

Bridge Priority

16 bit priority which forms the bridge id.

0 – 61440

Default setting: 32768

Bridge Hello Time

Configuration BPDU emission interval

1– 2 s

Default setting: 2 s

Bridge Max Age Time

Time that a configuration BPDU remains valid after being issued by the Root bridge in STP. Not used in RSTP.

6 – 40 s

Default setting: 40 s

Transmit Hold Count

Value used by the Port Transmit state machine to limit the maximum BPDU transmission rate. Not more than Transmit Count BPDUs are transmitted in any Hello Time.

3 – 100 messages

Default setting: 6 messages

Bridge Forward Delay

Delay used by STP bridges to transition blocked ports to forwarding. Not used in RSTP.

4 – 30 s

Default setting: 21 s

Port 1 Priority

8 bit priority value which is a part of port id

0 – 240 (in step of 16)

Default setting: 128

Port 1 Cost

The contribution of this port to the path cost of paths towards the Root bridge which includes this port.

1 – 200,000,000 according to link speed

Default setting: 0 (Auto)

RSTP calculates the value based on the link speed of the Ethernet port.

When the value is auto, the cost is set with the default value based on the Link Speed. Ie. For 100 mbps, the default value is 200000 and for 10 mbps, the default value is 2000000.