The default is 15 seconds.2. Change the hello-time parameter.PROTOCOL MSTP modehello-time secondsNOTE: With large configurations (especially those configurations with more ports) DellNetworking recommends increasing the hello-time.The range is from 1 to 10.The default is 2 seconds.3. Change the max-age parameter.PROTOCOL MSTP modemax-age secondsThe range is from 6 to 40.The default is 20 seconds.4. Change the max-hops parameter.PROTOCOL MSTP modemax-hops numberThe range is from 1 to 40.The default is 20.Example of the forward-delay ParameterTo view the current values for MSTP parameters, use the show running-config spanning-treemstp command from EXEC privilege mode.Dell(conf-mstp)#forward-delay 16Dell(conf-mstp)#exitDell(conf)#do show running-config spanning-tree mstp!protocol spanning-tree mstpno disablename my-mstp-regionMSTI 1 VLAN 100MSTI 2 VLAN 200-300forward-delay 16MSTI 2 bridge-priority 4096Dell(conf)#Modifying the Interface ParametersYou can adjust two interface parameters to increase or decrease the probability that a port becomes aforwarding port.• Port cost is a value that is based on the interface type. The greater the port cost, the less likely theport is selected to be a forwarding port.Multiple Spanning Tree Protocol (MSTP) 519
