D-Link DGS-1510 User Manual - Page 147
STP Global Settings, Edge Port, P2P Port, 1D-1998/802.1D-2004/802.1Q-2005 Compatibility
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DGS-1510 Series Gigabit Ethernet SmartPro Switch Web UI Reference Guide RSTP is capable of a more rapid transition to a forwarding state - it no longer relies on timer configurations - RSTP compliant bridges are sensitive to feedback from other RSTP compliant bridge links. Ports do not need to wait for the topology to stabilize before transitioning to a forwarding state. In order to allow this rapid transition, the protocol introduces two new variables: the edge port and the point-to-point (P2P) port. Edge Port The edge port is a configurable designation used for a port that is directly connected to a segment where a loop cannot be created. An example would be a port connected directly to a single workstation. Ports that are designated as edge ports transition to a forwarding state immediately without going through the listening and learning states. An edge port loses its status if it receives a BPDU packet, immediately becoming a normal spanning tree port. P2P Port A P2P port is also capable of rapid transition. P2P ports may be used to connect to other bridges. Under RSTP/MSTP, all ports operating in full-duplex mode are considered to be P2P ports, unless manually overridden through configuration. 802.1D-1998/802.1D-2004/802.1Q-2005 Compatibility MSTP or RSTP can interoperate with legacy equipment and is capable of automatically adjusting BPDU packets to 802.1D-1998 format when necessary. However, any segment using 802.1D-1998 STP will not benefit from the rapid transition and rapid topology change detection of MSTP or RSTP. The protocol also provides for a variable used for migration in the event that legacy equipment on a segment is updated to use RSTP or MSTP. The Spanning Tree Protocol (STP) operates on two levels: • On the switch level, the settings are globally implemented. • On the port level, the settings are implemented on a per-user-defined group of ports basis. STP Global Settings This window is used to view and configure the STP global settings. To view the following window, click L2 Features > STP > STP Global Settings, as shown below: Figure 5-44 STP Global Settings Window 136
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