Operation Manual – MSTPH3C S5100-SI/EI Series Ethernet Switches Chapter 1 MSTP Configuration1-28The network diameter parameter indicates the size of a network. The bigger thenetwork diameter is, the larger the network size is.After you configure the network diameter of a switched network, an MSTP-enabledswitch adjusts its hello time, forward delay, and max age settings accordingly to bettervalues.The network diameter setting only applies to CIST; it is invalid for MSTIs.II. Configuration example# Configure the network diameter of the switched network to 6. system-view[Sysname] stp bridge-diameter 61.3.9 Configuring the MSTP Time-related ParametersThree MSTP time-related parameters exist: forward delay, hello time, and max age.You can configure the three parameters to control the process of spanning treecalculation.I. Configuration procedureFollow these steps to configure MSTP time-related parameters:To do... Use the command... RemarksEnter system view system-view —Configure the forwarddelay parameterstp timer forward-delaycentisecondsRequiredThe forward delay parameterdefaults to 1,500centiseconds (namely, 15seconds).Configure the hellotime parameterstp timer hellocentisecondsRequiredThe hello time parameterdefaults to 200 centiseconds(namely, 2 seconds).Configure the max ageparameterstp timer max-agecentisecondsRequiredThe max age parameterdefaults to 2,000centiseconds (namely, 20seconds).All switches in a switched network adopt the three time-related parameters configuredon the CIST root bridge.
