5 Configuration D-Link Web Smart Switch User Manual
An STP Group spanning tree works in the same way as the switch-level spanning tree, but the root bridge
concept is replaced with a root port concept. A root port is a port of the group that is elected based on port
priority and port cost, to be the connection to the network for the group. Redundant links will be blocked, just
as redundant links are blocked on the switch level.
The STP on the switch level blocks redundant links between switches (and similar network devices). The
port level STP will block redundant links within an STP Group.
It is advisable to define an STP Group to correspond to a VLAN group of ports.
Figure 70 – Configuration > Spanning Tree > STP Port Settings
From Port/To Port: A consecutive group of ports may be configured starting with the selected port.
State: Use the drop-down menu to enable or disable STP by per-port based. It will be selectable after the
global STP is enabled.
External Cost: This defines a metric that indicates the relative cost of forwarding packets
to the specified port list. Port cost can be set automatically or as a metric value. The
default value is 0 (auto).
0 (auto) - Setting 0 for the external cost will automatically set the speed for forwarding packets to the
specified port(s) in the list for optimal efficiency. Default port cost: 100Mbps port = 200000. Gigabit
port = 20000.
Value 1-200000000 - Define a value between 1 and 200000000 to determine the external cost. The
lower the number, the greater the probability the port will be chosen to forward packets.
Migrate: Setting this parameter as Yes will set the ports to send out BPDU packets to other bridges,
requesting information on their STP setting. If the Switch is configured for RSTP, the port will be capable to
migrate from 802.1d STP to 802.1w RSTP. Migration should be set as yes on ports connected to network
stations or segments that are capable of being upgraded to 802.1w RSTP on all or some portion of the
segment.
Edge: Selecting the True parameter designates the port as an edge port. Edge ports cannot create loops,
however an edge port can lose edge port status if a topology change creates a potential for a loop. An edge
port normally should not receive BPDU packets. If a BPDU packet is received, it automatically loses edge
port status. Selecting the False parameter indicates that the port does not have edge port status. Selecting
the Auto parameter indicates that the port have edge port status or not have edge port status automatically.
Priority: Specify the priority of each port. Selectable range is from 0 to 240, and the default setting is 128.
The lower the number, the greater the probability the port will be chosen as a root port.
P2P: Choosing the True parameter indicates a point-to-point (P2P) shared link. P2P ports are similar to edge
ports, however they are restricted in that a P2P port must operate in full-duplex.
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