D-Link DES-3528 Product Manual - Page 95

xStack® DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch Web UI Reference Guide 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 BDPU 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. NNI BPDU Address Configure NNI port address. dot1d - Specifies GVRP's BPDU MAC address of NNI port using the definition of 802.1d. dot1ad - Specifies GVRP's BPDU MAC address of NNI port using the definition of 802.1ad. Click the Apply button to accept the changes made for each individual section. 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) STP Port Settings STP can be set up on a port per port basis. To view the following window, click L2 Features > Spanning Tree > STP Port Settings, as shown below: Figure 4-29 STP Port Settings window It is advisable to define an STP Group to correspond to a VLAN group of ports. 86