Re: Force 100 Full Duplex (V210)

Michael Tosch wrote:
casevh@xxxxxxxxxxx wrote:

Ceri Davies wrote:

I suspect that rahan knows that, but in every institution I have
worked at, Cisco <-> Sun autonegotiation has failed to work. Perhaps he
is finding the same.


I'll comment as the administrator of a large number of Cisco switches
....

Auto-negotiation works well with current Sun and Cisco hardware. It was
problematic with some older hardware.

For example, the original Catalyst 5000 switch cards did not support
auto-negotiation. Later models did support auto-negotiation. When you
migrate to newer switch hardware, it is easiest to keep the port
settings the same.

I have also seen issues with certain older Sun hardware not
re-negotiating if the cable is unplugged or if the switch is rebooted.
The computer will happily keep running in full-duplex mode while the
switch defaults to half-duplex because it didn't see the negotiation
process. (We still get bit by this one about every six months or so.)


We have observed the same a few years ago: a power-cycle of a network
switch caused a disaster: we had to reboot hundreds of Ultra-5
workstations, they have got fixed settings since.

Was it really the hardware or the Solaris NIC driver?


"Modern" hardware generally autonegotiates successfully. The hardware of six to ten years ago *may* cause problems. My Ultra 10s and Ultra 5 negotiate successfully with a Cisco 1548M switch. They also autonegotiate with LinkSys switches.

Try autonegotiation first. If it doesn't work then, and only then, consider forcing both ends of the link.



.

Relevant Pages

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