[K12OSN] New amer.com switch troubles

John Baillie jbaillie at stmarys-school.org
Tue Dec 27 02:13:04 UTC 2005

This happened to us a year ago. We had a 150' cable run to a sr24g2 all 
worked well (1000mb connection) for a few months then I lost connection 
to server. I disconected the server and plugged in a laptop and had 
100mb connection to the switch. I connected the server to another switch 
and and had 1000mb connection. We  moved the server into the same room 
as the switch all was back to normal. We are now back to using fiber 
between all buildings but I think what happened last year was water got 
into the conduit and the 1000mb copper connection needs pristine 
conditions where the 100mb was more forgiving. Just a guess though.

NONE NONE wrote:

>I just got the new amer.com switches and hooked them all up, and now things aren't working. I have checked all the connections, it's wired correctly, but none of the student pcs will boot to linux anymore.
>Here is the setup:
>Server goes into port 1 of sgd8 (8x1000meg ports)
>Port 2 of sgd8 goes into port 25 of sr24g2 (24*100meg, 2*1000meg)
>Various ports from 1-24 of sr24g2 go into the student pcs
>One problem I can see is that the connection from the server into the sgd8 is listed as 100meg on the switch itself, even though the server can put out 1000meg. I think maybe the card in the server is configured to put out something wrong. How can I check what it is putting out and how can I change it? I assume it should be putting out 1000meg full duplex. Here is what ethtool says:
>        Supported ports: [ TP ]
>        Supported link modes:   10baseT/Half 10baseT/Full
>                                100baseT/Half 100baseT/Full
>                                1000baseT/Full
>        Supports auto-negotiation: Yes
>        Advertised link modes:  10baseT/Half 10baseT/Full
>                                100baseT/Half 100baseT/Full
>                                1000baseT/Full
>        Advertised auto-negotiation: Yes
>        Speed: 100Mb/s
>        Duplex: Full
>        Port: Twisted Pair
>        PHYAD: 0
>        Transceiver: internal
>        Auto-negotiation: on
>        Supports Wake-on: umbg
>        Wake-on: g
>        Current message level: 0x00000007 (7)
>        Link detected: yes
>I tried running this:
>ethtool -s eth0 duplex full speed 1000
>But ethtool still says the same thing as pasted above, and the switch still says 100meg speed. Also, all of the lights on the switches are just flashing like crazy.
>Thank you for any help, it is much appreciated! And merry christmas!
>K12OSN mailing list
>K12OSN at redhat.com
>For more info see <http://www.k12os.org>

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