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