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xStack DGS-3600 Series Layer 3 Gigabit Ethernet Managed Switch CLI Manual
88
config stp ports
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 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. 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 loopback detection
function on the Switch for the ports configured above in the config stp
command.
fbpdu [enable | disable] − Allows the forwarding of STP BPDU packets from
other network devices when STP is disabled on the Switch. This function can
only be in use when STP is globally disabled and forwarding BPDU packets
is enabled. The default is enabled and BPDU packets will not be forwarded.
Restrictions Only administrator-level users can issue this command.
Example usage:
To configure STP with path cost 19, hellotime set to 5 seconds, migration enable, and state enable for ports 1-5 of module 1.