42 Sun Crypto Accelerator 4000 Board Installation and User’s Guide • May 2003
When the local link is operating in autonegotiation mode for the speed and duplex
parameters at 100 Mbps and below and both full and half duplexes, then the link
partner uses either the 100 Mbps or 10 Mbps speeds with either duplex.
When the speed parameter is operating in forced mode, the value must match the
speed value of the link-partner.If the duplex parameter does not match between
the local link and the link partner,the link may come up; however, traffic collisions
will occur.
When the local link speed parameter is set to autonegotiation and the link partner
speed parameter is set to forced, the link may come up depending on whether the
speed value can be negotiated between the local link and the link partner.The
interface in autonegotiation mode will always try to establish a link (if there is a
speed match) at half duplex by default. Because one of the two interfaces is not in
autonegotiation mode, the interface in autonegotiation mode detects only the speed
parameter; the duplex parameter is not detected. This method is called parallel-
detection.
Caution – The establishment of a link with a duplex conflict always leads to traffic
collisions.
For a local link parameter to operate in forced mode, the parameter must have a
value other than auto. For example, to establish a forced mode link at 100 Mbps
with half duplex, type the following at the OBP prompt:
Note – In the examples in this section, net is an alias for the default, integrated
network interface device path. Youcan configure other network devices by
specifying a device path instead of using net.
Toestablish a forced mode link at 1000 Mbps with half duplex that is a clock master,
type the following command at the OBP prompt:
Note – The link-clock parameter must have a value that corresponds to the
link-clock value of the link partner.For example, if the link-clock value on the
local link is set to master,the link-clock value on the link partner must be set to
slave.
ok boot net:speed=100,duplex=half
ok boot net:speed=1000,duplex=half,link-clock=master