Operation Manual – MSTPH3C S3100 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 procedureTable 1-17 Configure MSTP time-related parametersOperation Command DescriptionEnter system view system-view —Configure the forwarddelay parameterstp timerforward-delaycentisecondsRequiredThe forward delay parameterdefaults to 1,500 centiseconds(namely, 15 seconds).Configure the hellotime parameterstp timer hellocentisecondsRequiredThe hello time parameter defaults to200 centiseconds (namely, 2seconds).Configure the max ageparameterstp timer max-agecentisecondsRequiredThe max age parameter defaults to2,000 centiseconds (namely, 20seconds).All switches in a switched network adopt the three time-related parameters configuredon the CIST root bridge.
