D-Link 3250TG Product Manual - Page 65

Parameter, Description

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D-Link DES-3250TG Standalone Layer 2 Switch In addition to setting Spanning Tree parameters for use on the switch level, the switch allows for the configuration of a group of ports. This STP Group will use the switch-level parameters entered above, with the addition of Port Priority and Port Cost. The 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 on the basis of 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 the STP Group. The following fields can be set: Parameter Description From and To State Cost Priority Migration Edge Consecutive groups of ports may be configured starting with the selected port. Toggle to enable STP on the selected ports. A Port Cost can be set from 1 to 200000000. The lower the number, the greater the probability the port will be chosen to forward packets. Default port cost: 100Mbps port = 200000 Gigabit ports = 20000 A Port Priority can be from 0 to 240. The lower the number, the greater the probability the port will be chosen as the Root Port. Select Yes or No. Choosing Yes will enable the port to migrate from 802.1d STP status to 802.1w RSTP status. RSTP can coexist with standard STP, however the benefits of RSTP are not realized on a port where an 802.1d network connects to an 802.1w enabled network. Migration should be enabled (Yes) on ports connected to network stations or segments that will be upgraded to 802.1w RSTP on all or some portion of the segment. Select Yes or No. Choosing Yes 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 57

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D-Link DES-3250TG Standalone Layer 2 Switch
In addition to setting Spanning Tree parameters for use on the switch level, the switch allows for the
configuration of a group of ports. This STP Group will use the switch-level parameters entered above,
with the addition of Port Priority and Port Cost.
The 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 on
the basis of 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 the STP Group.
The following fields can be set:
Parameter
Description
From
and
To
Consecutive groups of ports may be
configured starting with the selected
port.
State<
Disabled
>
Toggle to enable STP on the selected
ports.
Cost
A Port Cost can be set from
1
to
200000000
. The lower the number,
the greater the probability the port
will be chosen to forward packets.
Default port cost:
100Mbps port = 200000
Gigabit ports
= 20000
Priority
A Port Priority can be from
0
to
240
.
The lower the number, the greater
the probability the port will be
chosen as the Root Port.
Migration
<No>
Select
Yes
or
No
. Choosing
Yes
will
enable the port to migrate from
802.1d STP status to 802.1w RSTP
status.
RSTP
can
coexist
with
standard STP, however the benefits
of RSTP are not realized on a port
where an 802.1d network connects
to an 802.1w enabled network.
Migration should be enabled (
Yes
) on
ports connected to network stations
or segments that will be upgraded to
802.1w RSTP on all or some portion
of the segment.
Edge
<No>
Select
Yes
or
No
. Choosing
Yes
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
57