D-Link DXS-3400 User Manual - Page 152

DXS-3400 Series Lite Layer 3 Stackable 10GbE Managed Switch Web UI Reference Guide Parameter STP Mode Description Select the STP mode used here. Options to choose from are MSTP, RSTP, and STP. Click the Apply button to accept the changes made. The fields that can be configured for STP Priorityare described below: Parameter Priority Description Select the STP priority value here. This value is between 0 and 61440. By default, this value is 32768. The lower the value, the higher the priority. Click the Apply button to accept the changes made. The fields that can be configured for STP Configurationare described below: Parameter Bridge Max Age Bridge Hello Time Bridge Forward Time TX Hold Count Max Hops NNI BPDU Address Description Enter the bridge's maximum age value here. This value must be between 6 and 40 seconds. By default, this value is 20 seconds. The maximumage value 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. After selecting RSTP/STP as the Spanning Tree Mode, this parameter will be available. Enter the bridge's hello time value here. This value must be between 1 and 2 seconds. By default, this value is 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. Enter the bridge's forwarding time value here. This value must be between 4 and 30 seconds. By default, this value is 15 seconds. Any port on the Switch spends this time in the listening state while moving from the blocking state to the forwarding state. Enter the transmit hold count value here. This value must be between 1 and 10 times. By default, this value is 6 times. This value is used to set the maximum number of Hello packets transmitted per interval. Enter the maximum number of hops that are allowed. This value must be between 6 and 40 hops. By default, this value is 20 hops. This value is 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 BDPU packet and the information held for the port will age out. Select the NNI BPDU Address option here. Options to choose from are Dot1d and Dot1ad. By default, this option is Dot1d. This parameter is used to determine the BPDU protocol address for STP in the service provide site. It can use an 802.1d STP address, 802.1ad service provider STP address, or a user defined multicast address. Click the Apply button to accept the changes made. STP Port Settings This window is used to display and configure the STP port settings. 142