[87951] in North American Network Operators' Group
Re: Problems connectivity GE on Foundry BigIron to Cisco 2950T
daemon@ATHENA.MIT.EDU (Sam Stickland)
Sun Jan 15 19:03:29 2006
Date: Mon, 16 Jan 2006 00:02:43 +0000 (GMT Standard Time)
From: Sam Stickland <sam_ml@spacething.org>
To: nanog@nanog.org
Cc: Paul G <paul@rusko.us>
In-Reply-To: <Pine.WNT.4.64.0601152337490.2524@p4-2800>
Errors-To: owner-nanog@merit.edu
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@studentsonly.com>
>> To: "Randy Bush" <randy@psg.com>; "David Hubbard"
>> <dhubbard@dino.hostasaurus.com>
>> Cc: "Sam Stickland" <sam_ml@spacething.org>; <nanog@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
>
