[rescue] Cisco Weirdness
sadler at homesys.org
Sat Dec 20 18:08:12 CST 2003
On Thu, 20 Nov 2003 21:15:42 -0500, Thomas Gallaway opined:
> I rescued a cisco 2900-XL out of a dumpster.
> So the switch works, I can plug in stuff but here is my problem. Not
> every NIC or switch I connect works. This is total random. I am able
> to connect a sun nic, a switch and a wireless access point too it but
> an PC's nic or another switch/hub will not get a link. I tried all
> ports and different cables and did not seem to find anything usefull.
> I was able to upload the latest IOS image to it but that did not fix
> it. It does not seem that the switch really is bad as I can connect
> to every port and telnet into the switch. It is just that I can not
> plug everything into it.
1. Back when these devices first came out, the whole auto-negotiation
thing for Ethernet (10/100, Full/Half Duplex) was poorly specified,
and a number of devices didn't implement it correctly. Just talk
to the guys at the UNH Ethernet Test lab (something I get to do as
a part of my day job :^) and you'll get the picture about how bad
it really was. Without pointing fingers, I can say that the company
with the "bay bridge"-like logo is one of the known culprits. The
common workaround is to manually configure speed and duplex.
2. It could be a Ethernet cross-over cable thing...
Hope this helps,
More information about the rescue