This is a "feature" of using just about any normal RS232 device on
the other end of a console cable, power cycing or rebooting will
dump the Sparcs into the "ok?" prompt. This is because the Sun
OS inteprets any line distrubance on the the console serial port
(or keyboard port) that raises a "framing error" signal on the
UARTS as a command to jump to the monitor. Cisco's actually do
the same thing, albeit with a config register setting to disable
the function after bootup.
There are two common solutions. One is the pacth the Sun operating
system to ignore the framing error, info on how to do this is in the
Sun faq's (see www.sunhelp.com)
The other is to use an N-way remote console switch to a single
serial port or router aux-port, since the electronics in these
typically isolates the un-selected port, rather than having all
ports connected as in the milking-machine approach.
The third is just to put an adequate UPS on your console server
and avoid power-cycling or rebooting it. 8-)
George
> From: Scott Weil <sweil@calweb.com>
> To: cisco-nsp@puck.nether.net
> Subject: [nsp] Disabling of break to modem Hosts
>
> I apologize in advance if this is the wrong forum for this
> question. I am currently using a 2511 (IOS 11.1(16)) as a console
> server for my various sun servers. Each line is currently configured
> as 'modem Host' and I can console to my sun boxes beautifully. My
> only problem is that if my 2511 is powered of it will send hardware breaks
> to any servers that are currently attached to it. All of my sun boxes
> immediatly go to an 'ok' prompt. I have heard stories that this break
> feature can be turned off on the cisco end, but have not been able to find
> any documentation on how to go about doing this (or maybe I have, but am
> just too ill informed to have realized it). Any ideas?
>
> Once again I apologize if this is the wrong forum, and would ask any
> potential flames to include a pointer to the correct mailing list along
> with any negative feelings you may want to convey.
>
> Thanks!
>
> -Scott
This archive was generated by hypermail 2b29 : Sun Aug 04 2002 - 04:12:15 EDT