Problems connectivity GE on Foundry BigIron to Cisco 2950T

Mon Jan 16 00:02:43 UTC 2006

Replying to my own email..

I've found some sites that suggest it's not possible to disable 
auto-negotiation on 1000Base-T since other operational parameters are 
negotiated including selection of the master clock signal. I was aware 
that flow control was negotiated, but not the clock signal.

Can anyone elaborate?

Sam

On Sun, 15 Jan 2006, Sam Stickland wrote:

>
> Hi,
>
> On Sun, 15 Jan 2006, Paul G wrote:
>
>> ----- Original Message ----- From: "Farrell,Bob" <bobf at studentsonly.com>
>> To: "Randy Bush" <randy at psg.com>; "David Hubbard" 
>> <dhubbard at dino.hostasaurus.com>
>> Cc: "Sam Stickland" <sam_ml at spacething.org>; <nanog at nanog.org>
>> Sent: Sunday, January 15, 2006 4:45 PM
>> Subject: RE: Problems connectivity GE on Foundry BigIron to Cisco 2950T
>> 
>>> Cisco commands-
>> 
>>> speed 1000
>>> duplex full
>> 
>> the bigiron wants (iirc):
>> 
>> spe 1000-full
>> 
>> i strongly suggest you peruse the cli reference for both devices.
>
> On the foundry GBIC blades you can't configure the speed and duplex settings, 
> they only support 1000-full.
>
> (config-if-e1000-1/2)#speed-duplex 1000-full
> Error - can't change speed and duplex mode
>
> I've dug through as much information as I can about the cisco 2950T and 
> 802.3z/802.3ab and disabling the auto-negiation. There appears to be no 
> command at all available to do this.
>
> The cabling arrangement is:
>
> Foundry -- Straight -- Patch -- Underfloor -- Patch -- Crossover -- Cisco
> GBIC       Cable      Panel     Straight     Panel      Cable
>
> If I replace the final crossover cable with a straight, change the foundry to 
> a 10/100 port, and plug the final end into a host NIC instead of the cisco I 
> get a connection. Crossover cable has been changed twice now, and the RJ45 
> GBIC was previously working in a cisco 6500.
>
> I am extensively familar (at least I believe I am) with both these models, 
> and this one has me stumped.
>
> If nobody else can see any configuration errors I guess I'm down to hardware 
> issues.
>
> Sam
>