D-Link DES 6000 Product Manual - Page 52

Choose STP Switch Settings to access the following screen: Modular Ethernet Switch User's Guide Figure 6-20. STP Parameters Setting screen The information on the screen is described as follows: ♦ Spanning Tree Protocol Select Enabled to implement the Spanning Tree Protocol. ♦ Time Since Topology Change(Sec) Read-only object displays the last time changes were made to the network topology. These changes usually occur when backup paths are activated due to primary path failures. ♦ Topology Change Count Read-only object displays the number of times (since the current management session with the device was started) changes were made to the network topology. Changes usually occur on the network when backup paths are activated. ♦ Designated Root Read-only object displays the MAC (Ethernet) address of the bridge/switch on the network that has been chosen as the STP root. ♦ Root Cost Read-only object displays the cost for the path between the switch and the root bridge. If the switch is the root bridge, then the root cost is zero. ♦ Root port Read-only object identifies the port (on the bridge) that offers the least path cost from the bridge to the root bridge. In the event of a network loop, data packets will pass through the root port. ♦ Max Age(Sec) Read-only object indicates the maximum age of STP information learned from the network (on any port) before it is discarded. ♦ Forward Delay(Sec) Read-only object indicates how fast any port on the bridge can change its spanning state when moving towards the forwarding state. The value determines how long the port stays in each of the listening and learning states, which precede the forwarding state. ♦ Hold Time(Sec) Read-only object displays the time interval during which no more than two configuration BPDUs shall be transmitted by the bridge. ♦ Root Priority Read-only object displays the priority number of the root bridge of the Spanning Tree. The value is used in conjunction with the bridge MAC address to set the bridge ID, which in turn is used when determining the root bridge of a multi-bridged network. The root bridge is responsible for processing data packets when network loops occur. The smaller the number set, the higher the bridge priority is. The higher the bridge priority, the more chance the bridge has of becoming the root bridge. A bridge priority ranges from 0 to 65535, with 0 being the highest priority. ♦ Max Age(6-40 Sec) Maximum Age is a read-write object that can be set from 6 to 40 seconds. At the end of the Maximum Age, if a BPDU has still not been received from the Root ridge, your Switch will Using the Console Interface 47