TP-Link T1500-28PCT T1500-28PCTTL-SL2428PUN V3 User Guide - Page 349

Configuring Spanning Tree MSTP Configurations Forward Delay Tx Hold Count Max Hops Specify the interval between the port state transition from listening to learning. The default value is 15. It is used to prevent the network from causing temporary loops during the regeneration of spanning tree. The interval between the port state transition from learning to forwarding is also the Forward Delay. Specify the maximum number of BPDU that can be sent in a second. The default value is 5. Specify the maximum BPDU hop counts that can be forwarded in a MST region. The default value is 20. A switch receives BPDU, then decrements the hop count by one and generates BPDUs with the new value. When the hop reaches zero, the switch will discard the BPDU. This value can control the scale of the spanning tree in the MST region. Note: Max Hops is a parameter configured in MSTP. You need not configure it if the spanning tree mode is STP/RSTP. Note: To prevent frequent network flapping, make sure that Hello Time, Forward Delay, and Max Age conform to the following formulas: •• 2*(Hello Time + 1) = Max Age 2) In the Global Config section, enable Spanning-Tree function and choose the STP mode as MSTP and click Apply. Spanning-Tree Check the box to enable the spanning tree function globally. Mode Select the desired spanning tree mode as STP/RSTP on the switch. By default, it's STP. STP: Specify the spanning tree mode as STP. RSTP: Specify the spanning tree mode as RSTP. MSTP: Specify the spanning tree mode as MSTP. User Guide 326