Netgear M4300-8X8F (XSM4316S) - Stackable Managed Switch with 16x10G including 8x10GBASE-T and 8xSFP+ Layer 3 User Manual

Specify values for CST in the appropriate fields:

. When switches or bridges are running STP, each is assigned a 

priority. After exchanging BPDUs, the switch with the lowest priority value becomes 
the root bridge. Specifies the bridge priority value for the Common and Internal 
Spanning Tree (CST). The valid range is 0–61440. The bridge priority is a multiple of 
4096. If you specify a priority that is not a multiple of 4096, the priority is automatically 
set to the next lowest priority that is a multiple of 4096. For example, if the priority is 
attempted to be set to any value between 0 and 4095, it is set to 0. The default priority 
is 32768.

. The bridge maximum age time for the Common and Internal 

Spanning Tree (CST), which indicates the amount of time in seconds a bridge waits 
before implementing a topological change. The valid range is 6–40, and the value 
must be less than or equal to (2 * Bridge Forward Delay) – 1 and greater than or 
equal to 2 * (Bridge Hello Time +1). The default value is 20.

. The bridge hello time for the Common and Internal 

Spanning Tree (CST), which indicates the amount of time in seconds a root bridge 
waits between configuration messages. The value is fixed at 2 seconds. The value 
must be less than or equal to (Bridge Max Age / 2) - 1. The default hello time value is 
2.

 The bridge forward delay time, which indicates the 

amount of time in seconds a bridge remains in a listening and learning state before 
forwarding packets. The value must be greater or equal to (Bridge Max Age / 2) + 1. 
The time range is from 4 seconds to 30 seconds. The default value is 15 seconds.