648 | Multiple Spanning Tree Protocolw w w . d e l l . c o m | s u p p o r t . d e l l . c o m To change the region name or revision:View the current region name and revision using the command show spanning-tree mst configuration fromEXEC Privilege mode, as shown in Figure 29-6.Figure 29-6. Viewing the MSTP Region Name and RevisionModify Global ParametersThe root bridge sets the values for forward-delay, hello-time, max-age, and max-hops and overwrites thevalues set on other MSTP bridges.• Forward-delay is the amount of time an interface waits in the Listening State and the Learning Statebefore it transitions to the Forwarding State.• Hello-time is the time interval in which the bridge sends MSTP Bridge Protocol Data Units (BPDUs).• Max-age is the length of time the bridge maintains configuration information before it refreshes thatinformation by recomputing the MST topology.• Max-hops is the maximum number of hops a BPDU can travel before a receiving switch discards it.To change MSTP parameters, use the following commands on the root bridge:Task Command Syntax Command ModeChange the region name. name name PROTOCOL MSTPChange the region revision number.• Range: 0 to 65535• Default: 0revision number PROTOCOL MSTPNote: Dell Force10 recommends that only experienced network administrators change MSTP parameters.Poorly planned modification of MSTP parameters can negatively impact network performance.Task Command Syntax Command ModeChange the forward-delay parameter.• Range: 4 to 30• Default: 15 secondsforward-delay seconds PROTOCOL MSTPFTOS(conf-mstp)#name my-mstp-regionFTOS(conf-mstp)#exitFTOS(conf)#do show spanning-tree mst configMST region name: my-mstp-regionRevision: 0MSTI VID1 1002 200-300
