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DES-3200-10/18/28/28F Layer 2 Ethernet Managed Switch User Manual
The following fields can be set:
Parameter Description
From Port/To Port
A consecutive group of ports may be configured starting with the selected port.
External 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 1-200000000 - 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
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 Auto parameter
will indicate that the port will be able to automatically enable edge port status if needed.
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. The default value True is equivalent to the Auto
value.
Port STP
Allows STP to be Enabled or Disabled for the ports.
Restricted Role
Toggle between True and False to set the restricted role state of the packet. The default
value is False.
Restricted TCN
Toggle between True and False to set the restricted TCN of the packet. The default value
is False.
Forward BPDU
This field can be Enabled or Disabled. When Enabled, it allows the forwarding of STP
BPDU packets from other network devices. The default is Enabled.
Hello Time (1–2)
The Hello Time can be set from 1 to 2 seconds. This is the interval between two
transmissions of BPDU packets sent by the Root Bridge to tell all other switches that it is
indeed the Root Bridge. The default value is 2.
Click Apply to implement changes made.
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