Stp Port Settings - D-Link xStack DES-3528 series User Manual

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xStack DES-3528/DES-3552 Series Layer 2 Stackable Fast Ethernet Managed Switch User Manual

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
In addition to setting Spanning Tree parameters for use on the switch level, the Switch allows for the configuration of
groups of ports, each port-group of which will have its own spanning tree, and will require some of its own
configuration settings. An STP Group will use the switch-level parameters entered above, with the addition of Port
Priority and Port Cost.
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.
The following fields can be set:
Parameter
From Port / To Port
External Cost (0=Auto)
Figure 3 - 63 STP Port Settings window
Description
A consecutive group of ports may be configured starting with the selected port.
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.
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