D-Link DES-3550 Command Line Interface Reference Manual page 102

config stp ports
Used to setup STP on the port level.
Purpose
config stp ports <portlist> {externalCost [auto | <value 1-200000000>] | hellotime <value 1-10> |
Syntax
migrate [yes | no] edge [true | false] | p2p [true | false | auto] | state [enable | disable] | fbpdu
[enable|disable] }
This command is used to create and configure STP for a group of ports.
Description
<portlist> − Specifies a range of ports to be configured.
Parameters
externalCost − 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
auto.
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hellotime <value 1-10> − The time interval between transmission of configuration messages by
the designated port, to other devices on the bridged LAN, thus stating that the Switch is still
functioning. The user may choose a time between 1 and 10 seconds. The default is 2 seconds.
migrate [yes | no] – Setting this parameter as "yes" will set the ports to send out BDPU 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. 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 [true | false] – true 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. false indicates that the port does not have edge port
status.
p2p [true | false | auto] – true 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 auto.
state [enable | disable] − Allows STP to be enabled or disabled for the ports specified in the port
list. The default is enable.
fbpdu [enable | disable] − When enabled, this allows the forwarding of STP BPDU packets from
other network devices when STP is disabled in the specified ports. If you want 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. To globally disable
STP, use the disable stp command, to gloabally enable fbpdu, use the config stp command.
The default is disable.
Only administrator-level users can issue this command.
Restrictions
DES-3550 Layer 2 Fast Ethernet Switch
auto – Setting this parameter 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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