[c-nsp] connection speed at physical layer

[Martin T]

Martin,
I'm running GNU/Linux(Debian). I set this manually for testing
purposes. In other words eth0 interface is configured to allow
autonegotiation, but advertises only 10BASE-T/Full.

So it's clear, that if GE interface is configured to 10BASE-T mode, it
will send traffic on physical layer at max 10Mbps. Or for example if
FE interface is set to 10BASE-T mode, it will not send electrical
signals at rate of 100Mbps, but instead 10 times slower?


regards,
martin


2011/7/21 Martin Barry <marty at supine.com>:
> $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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