1-15In addition to the basic MSTP functions, 3com Switch 4500 also provides the following functions forusers to manage their switches.z Root bridge holdz Root bridge backupz Root guardz BPDU guardz Loop guardz TC-BPDU attack guardProtocols and StandardsMSTP is documented in:z IEEE 802.1D: spanning tree protocolz IEEE 802.1w: rapid spanning tree protocolz IEEE 802.1s: multiple spanning tree protocolMSTP Configuration Task ListBefore configuring MSTP, you need to know the position of each device in each MSTI: root bridge orleave node. In each MSTI, one, and only one device acts as the root bridge, while all others as leafnodes.Complete these tasks to configure MSTP:Task RemarksEnabling MSTPRequiredTo prevent network topology jittercaused by other related configurations,you are recommended to enable MSTPafter other related configurations areperformed.Configuring an MST Region RequiredSpecifying the Current Switch as a RootBridge/Secondary Root Bridge RequiredConfiguring the Bridge Priority of theCurrent SwitchOptionalThe priority of a switch cannot bechanged after the switch is specified asthe root bridge or a secondary rootbridge.Configuring How a Port Recognizes andSends MSTP Packets OptionalConfiguring the MSTP Operation Mode OptionalConfiguring the Maximum Hop Count of anMST Region OptionalConfiguring the Network Diameter of theSwitched NetworkOptionalThe default value is recommended.Configuring the MSTP Time-relatedParametersOptionalThe default values are recommended.ConfiguringRoot BridgeConfiguring the Timeout Time Factor Optional
