SUMMARY: Link DOWN

Thank you to the following people for there fast responses.

- Hichael Morton
- Mark Butscher
- David Newton

Now I have a better idea how to proceed. My Question:

> I have different Sun Fire V100. All connected to the same switch.
> Each solaris installation done by the same flash archive but
> personalized with different IP addresses of course. They are
> not yet in production mode: no special processes/cron jobs
> installed.
> 
> With an interval of a few days just one system sends following 
> message to /var/adm/messages:
> 
> Jan 12 14:08:56 master dmfe: [ID 247303 kern.notice] NOTICE: dmfe1: PHY 1 link down
> Jan 12 14:08:56 master dmfe: [ID 247303 kern.notice] NOTICE: dmfe1: PHY 1 link down
> Jan 12 14:08:57 master dmfe: [ID 426308 kern.info] dmfe1: PHY 1 link up 100 Mbps Full-Duplex
> 
> All other systems running smoothly! Any idea for the reason?
> Is it possible somehow to stress test the LAN interfaces?

Answers:

-----

sunvts can stress test your entire system
ftp can test the connection

link down/up
   this is not necessarily a bad thing
      once a week
      once a day
      once an hour
      once a minute
   check all network connections
      patch cable
         is it bad
         is it loose (1/32 can break a connection)
         are the connectors good
              improper cramping
              broken,missing, or bent tines
      ethernet wiring
         in the wall
            good and solid connections?
         at the patch panel
         at the hub/switch
      hub/switch
         good port
         bad port
         failing port
         hub/switch failure

go from the easiest to accomplish to the most difficult UNLESS you have
a reason to believe it is localized.

     swap cable for know good
     change port in the switch
     use another jack
     etc.

-----

Possibly the switch port that V100 is plugged into is hard set to 
half/full duplex, where as your NIC card is set to autonegotiate. Check 
your ndd settings to see how the NIC is set and make sure it is the same 
(either both are hard coded, or both are auto detect) as the switch port.

-----

Is duplexing set to 100 FDX or auto on your switch?  It could be
something as lame as a bad cable too.

----
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