Stp Port Instance Information - D-Link xStack DES-3800 Series User Manual

xStack DES-3800 Series Layer 3 Stackable Fast Ethernet Managed Switch
Parameter Description
From/To <Port 1>
External Cost < 0 = Auto>
Hello Time
Migration <Yes>
Edge <False>
P2P <True>
Forward BPDU
State
Click Apply to implement changes made.

STP Port Instance Information

Information about a previously created STP Port instance can be viewed in the STP Port Instance
Information window. To view the STP Port Instance Information window click Layer 2 Features >
Spanning Tree > STP Port Instance Information.
A consecutive group of ports may be configured starting with the selected port.
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.
The time interval between transmissions of configuration messages by the des-
ignated port, to other devices on the bridged LAN. The user may choose a time
between 1 and 10 seconds. The default is 2 seconds. This field is only operable
when the Switch is enabled for MSTP.
When operating in RSTP mode, selecting yes forces the port that has been
selected to transmit RSTP BPDUs.
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 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.
This drop-down menu allows you to enable or disable STP for the selected group
of ports. The default is Enabled.
This drop-down menu allows you to enable or disable STP for the selected group
of ports. The default is Enabled.
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