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DES-3010F/DES-3010FL/DES-3010G/DES-3016/DES-3018/DES-3026 Fast Ethernet Switch Manual
106
The following fields can be set:
Parameter Description
From/To
A consecutive group of ports may be configured starting with the selected port.
State
Used to Enable or Disable the STP port state settings on the Switch.
Cost (0 = Auto)
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 1-2000000 - Define a value between 1 and 2000000 to determine the
external cost. The lower the number, the greater the probability the port will be
chosen to forward packets.
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
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
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.
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. 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.
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.
Click Apply to implement changes made.
NOTE: To enable Forwarding BPDU on a per port basis, the following settings must first be in effect:
1. STP must be globally disabled and 2. Forwarding BPDU must be globally enabled. These are the
default settings configurable in the STP Bridge Global Settings menu discussed previously.