DES-3526 / DES-3526DC Layer 2 Fast Ethernet Switch CLI Reference Manual
70
config stp ports
Purpose
Used to setup STP on the port level.
Syntax config stp ports <portlist> {externalCost [auto | <value 1-200000000>] |
hellotime <value 1-10> | migrate [yes | no] edge [true | false] | p2p [true | false
| auto] | state [enable | disable] | lbd [enable | disable] | fbpdu [enable |
disable]}
Description
This command is used to create and configure STP for a group of ports.
Parameters
<portlist> − Specifies a range of ports to be configured.
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.
• 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.
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.
lbd [enable | disable] - Used to enable or disable the loop-back detection function
on the switch for the ports configured above in the config stp command.
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 globally enable fbpdu, use the config stp command. The default is disable.
Restrictions
Only administrator-level users can issue this command.
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