Operation Manual – MSTPH3C S7500E Series Ethernet Switches Chapter 1 MSTP Configuration1-26Note:z Network diameter is a parameter that indicates network size. A bigger networkdiameter represents a larger network size.z Based on the network diameter you configured, MSTP automatically sets an optimalhello time, forward delay, and max age for the device.z The configured network diameter is effective for the CIST only, and not for MSTIs.II. Configuration example# Set the network diameter of the switched network to 6. system-view[Sysname] stp bridge-diameter 61.3.7 Configuring Timers of MSTPMSTP involves three timers: forward delay, hello time and max age. You can configurethese three parameters for MSTP to calculate spanning trees.I. Configuration procedureFollow these steps to configure the timers of MSTP:To do... Use the command... RemarksEnter system view system-view —Configure the forwarddelay timerstp timer forward-delaycenti-secondsOptional1,500 centiseconds (15seconds) by defaultConfigure the hello timetimerstp timer hellocenti-secondsOptional200 centiseconds (2seconds) by defaultConfigure the max agetimerstp timer max-agecenti-secondsOptional2,000 centiseconds (20seconds) by defaultThese three timers set on the root bridge of the CIST apply on all the devices on theentire switched network.
