[c-nsp] connection speed at physical layer

Martin Barry marty at supine.com
Thu Jul 21 04:10:56 EDT 2011


$quoted_author = "Martin T" ;
> 
> This might be a bit stupid question, but I have following topology:
> 
> IBM_T60[eth0] <-> [Fa0/2]WS-C2950C-24
> 
> eth0 port is an "Intel Corporation 82573L" GE port and Fa0/2 port in
> WS-C2950C-24 switch is of course FE port. I have enabled
> autonegotiation on eth0 port, but it advertises only 10BASE-T/Full
> mode, so switch port, which is configured to "speed auto" and "duplex
> auto", is up with following settings:
> 
> Fa0/2     -> T60             connected    1          a-full   a-10 10/100BaseTX

What operating system are you running on the T60? You need to figure out why
it's not offering the full range of speeds during auto-negotiation.

 
> Am I correct, that actual signalling on physical layer is 10BASE-T? Or
> is eth0 port actually sending at 1Gbps(1000BASE-T signalling) rate and
> Fa0/2(100BASE-TX signalling) is sending at 100Mbps rate on physical
> layer?

Your first instinct is correct, both sides with be operating at 10/full
rather than the 100/full which you would obviously prefer.

cheers
Marty


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