I have a cisco 3550-24 that in periods keeps disappearing. friday-saturday: 148 times, yesterday-today: 45 times. Monday:zero.
The worst thing is that I can't get to it, it's locked inside a building I'm not allowed to set foot in. To do physical work, I have to order a techician to open the room and to do my work. That costs about $400-700. So I want to see if I can solve it from here. It's connected through fibre on a fastethernet port (2/21)on a 4503 I have locally. On the south end is a fibreconverter, and an ethernet cable going to fa0/24 on the 3550.
It has a simple configuration, customer vlan's through a trunk, a management vlan, and no routing. So it's a simple switch.
I can choose from full or half duplex, tried both on both ends, in addition to auto in the 3550 end.
the 4503 interface has this to say about errors:
169 input errors, 132 CRC
The 3550 has this to say: 12 input errors, 12 CRC.
I've upgraded software to 12.2-20, so the uptime isn't more than a couple of hours on the 3550.
But when it disappears, the uptime stays solid, so it doesn't reboot when it's 'away'.
I have interface snmp alerting turned on on the 4503, and it's never down when the 3550 is away. So the link doesn't go down. That makes me believe that the fibreconverter is allright as well.
When I try to transfer an image over tftp, it's very slow. (100mbit all the way, compared to other switches in my network, maybe 10 times as slow.) And the crc counter on the 4503 increases by a lot.
I've tried to connect it to another 3550 at my end via a fibreconverter, but the same result there as well. I haven't got a clue what to do, except buy a new switch, and pay someone to change it for me. But I don't want that.
Suggestions would be deeply appreciated.