D-Link DGS-3024 - Switch Manual page 64

Parameter Description
From/To A consecutive group of ports may be configured starting with the selected port.
External Cost (0 This defines a metric that indicates the relative cost of forwarding packets to the specified port
= Auto) list. Port cost can be set automatically or as a metric value. The default value is 0 (auto).
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Setting this parameter as Yes will set the ports to send out BDPU packets to other bridges,
Migration
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. If the Switch is configured for MSTP, the
port is capable of migrating from 802.1d STP to 802.1s MSTP. RSTP and MSTP can coexist
with standard STP, however the benefits of RSTP and MSTP are not realized on a port where
an 802.1d network connects to an 802.1w or 802.1s enabled network. Migration should be set
as yes on ports connected to network stations or segments that are capable of being upgraded
to 802.1w RSTP or 802.1s MSTP on all or some portion of the segment.
Edge Choosing 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. Choosing the False parameter indicates that
the port does not have edge port status.
Choosing the True parameter indicates a point-to-point (P2P) shared link. P2P ports are similar
P2P
to edge ports, however they are restricted in that a P2P port must operate in full duplex. Like
edge ports, P2P ports transition to a forwarding state rapidly thus benefiting from RSTP. A p2p
value of false indicates that the port cannot have p2p status. Auto allows the port to have p2p
status whenever possible and operate as if the p2p status were true. If the port cannot maintain
this status, (for example if the port is forced to half-duplex operation) the p2p status changes to
operate as if the p2p value were False. The default setting for this parameter is True.
State This drop-down menu allows you to enable or disable STP for the selected group of ports. The
default is Enabled.
BPDU Choosing Enabled will allow the forwarding of BPDU packets in the specified ports from other
network devices. This will go into effect only if STP is globally disabled AND Forwarding BPDU
is globally enabled (See STP Bridge Global Settings above). The default setting Disabled,
does not forward BPDU packets when STP is disabled.
LBD Use the pull-down menu to enable or disable the loop-back detection function on the Switch for
the ports configured above. For more information on this function, see the STP Loopback
Detection section.
Click Apply to implement changes made.
DGS-3024 Gigabit Ethernet Switch Manual
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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