TP-Link T2500G-10MPS T2500G-10MPSUN V1 Configuration Guide - Page 319

Configuring Spanning Tree MSTP Configurations Instance ID Select the desired instance. 2) In the Instance Port Config section, configure port parameters in the desired instance. UNIT Select the desired unit or LAGs for configuration. Priority Enter the value of port priority from 0 to 240, which is divisible by 16, and the default value is 128. The port with the lower value has the higher priority. In the same condition, the port with the highest priority will be elected as the root port in the desired instance. Path Cost Enter the value of the path cost. The default setting is Auto, which means the port calculates the path cost automatically according to the port's link speed. It is the path cost of the port in the desired instance. The port with the lowest path cost will be elected as the root of the desired instance. Port Role Displays the role that the port plays in the desired instance. Root Port: Indicates the port is the root port. Designated Port: Indicates the port is the designated port . Alternate Port: Indicates the port is a backup of a root port. Backup Port: Indicates the port is a backup of a designated port. Disabled: Indicates the port is not participating in the spanning tree. Port Status Displays the port status. Forwarding: The port receives and sends BPDUs, and forwards user data. Learning: The port receives and sends BPDUs, and drops the other packets. Blocking: The port only receives BPDUs and drops the other packets. Disconnected: The port is enabled with spanning tree function but not connected to any device. LAG Displays the LAG which the port belongs to. Configuration Guide 292