NOTE: 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.• Change the max-age parameter.PROTOCOL SPANNING TREE RSTP modemax-age secondsThe range is from 6 to 40.The default is 20 seconds.To view the current values for global parameters, use the show spanning-tree rstp command fromEXEC privilege mode.Enabling SNMP Traps for Root Elections and Topology ChangesTo enable SNMP traps, use the following command.• Enable SNMP traps for RSTP, MSTP, and PVST+ collectively.snmp-server enable traps xstpModifying Interface ParametersOn interfaces in Layer 2 mode, you can set the port cost and port priority values.• Port cost — a value that is based on the interface type. The previous table lists the default values. Thegreater the port cost, the less likely the port is selected to be a forwarding port.• Port priority — influences the likelihood that a port is selected to be a forwarding port in case thatseveral ports have the same port cost.To change the port cost or priority of an interface, use the following commands.• Change the port cost of an interface.INTERFACE modespanning-tree rstp cost costThe range is from 0 to 65535.The default is listed in the previous table.• Change the port priority of an interface.INTERFACE modespanning-tree rstp priority priority-valueThe range is from 0 to 15.The default is 128.Rapid Spanning Tree Protocol (RSTP) 693
