H3C S7500 Series Operation Manual

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H3C S7500 Series Operation Manual Manual pdf 17 page image

Operation Manual – MSTPH3C S7500 Series Ethernet Switches Chapter 1 MSTP Configuration1-151.2.7 Network Diameter ConfigurationIn a switched network, any two switches can communicate with each other through apath, on which there may be some other switches. The network diameter of a networkis measured by the number of switches; it equals the number of the switches on thelongest path (that is, the path containing the maximum number of switches).I. Configuration procedureFollow these steps to configure the network diameter for a network:To do ... Use the command ... RemarksEnter system view system-view —Configure the networkdiameter for a networkstp bridge-diameterbridgenumberRequiredThe default networkdiameter of a network is 7.The network diameter parameter indicates the size of a network. The larger the networkdiameter 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.The network diameter setting only applies to the CIST and it is invalid for MSTIs.II. Configuration example# Configure the network diameter of the switched network to 6. system-view[H3C] stp bridge-diameter 61.2.8 MSTP Time-related ConfigurationYou can configure three MSTP time-related parameters for a switch: Forward delay,Hello time, and Max age.z The Forward delay parameter sets the delay of state transition.Link failures in a network result in the spanning trees being regenerated and originalspanning tree structures being changed. As the newly generated configuration BPDUscannot be propagated across the entire network immediately when the new spanningtrees are generated, loops may occur if the new root ports and designated ports beginto forward packets immediately.This problem can be avoided by adopting a state transition mechanism. With thismechanism, newly selected root ports and designated ports undergo an intermediatestate before they begin to forward packets. That is, it costs these ports a period(specified by the Forward delay parameter) for them to turn to the forwarding state. The

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