D-Link DGS-3200-10 Product Manual - Page 119

xStack® DGS-3200 Series Layer 2 Gigabit Ethernet Managed Switch See the table below for descriptions of the STP versions and corresponding setting options. NOTE: The Bridge Hello Time cannot be longer than the Bridge Max Age. Otherwise, a configuration error will occur. Observe the following formulas when setting the above parameters: Bridge Max Age 2 x (Bridge Hello Time + 1 second) Configure the following parameters for STP: Parameter Description STP Status Use the radio button to globally enable or disable STP. STP Version Use the drop-down menu to choose the desired version of STP: STP - Select this parameter to set the Spanning Tree Protocol (STP) globally on the switch. RSTP - Select this parameter to set the Rapid Spanning Tree Protocol (RSTP) globally on the Switch. MSTP - Select this parameter to set the Multiple Spanning Tree Protocol (MSTP) globally on the Switch. Forwarding BPDU This field can be Enabled or Disabled. When Enabled, it allows the forwarding of STP BPDU packets from other network devices. The default is Enabled. Bridge Max Age (6 - 40) The Max Age may be set to ensure that old information does not endlessly circulate through redundant paths in the network, preventing the effective propagation of the new information. Set by the Root Bridge, this value will aid in determining that the Switch has spanning tree configuration values consistent with other devices on the bridged LAN. The user may choose a time between 6 and 40 seconds. The default value is 20 seconds. Bridge Hello Time (1 - 2) The Hello Time can be set from 1 to 2 seconds. This is the interval between two transmissions of BPDU packets sent by the Root Bridge to tell all other switches that it is indeed the Root Bridge. This field will only appear here when STP or RSTP is selected for the STP Version. For MSTP, the Hello Time must be set on a port per port basis. The default is 2 seconds. Bridge Forward Delay (4 - 30) The Forward Delay can be from 4 to 30 seconds. Any port on the Switch spends this time in the listening state while moving from the blocking state to the forwarding state. The default is 15 seconds TX Hold Count (1-10) Used to set the maximum number of Hello packets transmitted per interval. The count can be specified from 1 to 10. The default is 6. Max Hops (6-40) Used to set the number of hops between devices in a spanning tree region before the BPDU (bridge protocol data unit) packet sent by the Switch will be discarded. Each switch on the hop count will reduce the hop count by one until the value reaches zero. The Switch will then discard the BPDU packet and the information held for the port will age out. The user may set a hop count from 6 to 40. The default is 20. New Root Trap Used to enable or disable the sending of new root traps. The default is Enabled. Topology Change Trap Used to enable or disable the sending of topology change traps. The default is Enabled. Click Apply to implement changes made. 106