RE: Problems connectivity GE on Foundry BigIron to Cisco 2950T
You are using a crossover cable right? If that's all set, you do need to have neg-off on the Foundry and "no nego auto" on the Cisco. I haven't used the rj-45 gbics in the Foundry equipment before, not sure if that could be an issue. I would go with the hard set 1000-full on both sides. David From: Sam Stickland
Hi,
I'm having a right mare trying to get a Foundry BigIron to connect up to a cisco 2950T, via Gigabit copper.
The Foundry BigIron is using a cisco RJ45/copper GBIC that was pulled from a live cisco 6500, where it was working fine. The cisco 2950T has two fixed 10/100/1000 RJ45 ports.
The cables between the equipment have been tested and are fine.
The Foundry has three different types of the gigabit negiation modes:
auto-gig Autonegotiation neg-full-auto Autonegotiation first, if failed try non-autonegotiation neg-off Non-autonegotiation
I've tried all three, complete with all the other possibilities with the cisco 2950T (which has fixed full duplex operation, but can be set to 'speed auto' or 'speed 1000').
None of these combinations bring up the link. The cisco 2950 never gets a link light. The Foundry gets a link light regardless when it's mode is set to 'gig-default neg-off'.
I'm at a bit of a loss to explain this. Does anyone know of any configuration issues that can explain this, or is it time to start swapping out hardware components?
Sam
Hi, Yup, it's definately a cross-over cable. ;) I had already tried this suggestion but the cisco 2950T doesn't appear to have the "no nego auto" command :/ (config)#int Gi0/2 (config-if)#no n? % Unrecognized command (config-if)#no n (config-if)#no neg auto ^ % Invalid input detected at '^' marker. Sam On Sun, 15 Jan 2006, David Hubbard wrote:
You are using a crossover cable right? If that's all set, you do need to have neg-off on the Foundry and "no nego auto" on the Cisco. I haven't used the rj-45 gbics in the Foundry equipment before, not sure if that could be an issue. I would go with the hard set 1000-full on both sides.
David
From: Sam Stickland
Hi,
I'm having a right mare trying to get a Foundry BigIron to connect up to a cisco 2950T, via Gigabit copper.
The Foundry BigIron is using a cisco RJ45/copper GBIC that was pulled from a live cisco 6500, where it was working fine. The cisco 2950T has two fixed 10/100/1000 RJ45 ports.
The cables between the equipment have been tested and are fine.
The Foundry has three different types of the gigabit negiation modes:
auto-gig Autonegotiation neg-full-auto Autonegotiation first, if failed try non-autonegotiation neg-off Non-autonegotiation
I've tried all three, complete with all the other possibilities with the cisco 2950T (which has fixed full duplex operation, but can be set to 'speed auto' or 'speed 1000').
None of these combinations bring up the link. The cisco 2950 never gets a link light. The Foundry gets a link light regardless when it's mode is set to 'gig-default neg-off'.
I'm at a bit of a loss to explain this. Does anyone know of any configuration issues that can explain this, or is it time to start swapping out hardware components?
Sam
You are using a crossover cable right?
I'm having a right mare trying to get a Foundry BigIron to connect up to a cisco 2950T, via Gigabit copper.
i was under the impression that gige spec handled crossover automagically randy
Hi Randy, On Sun, 15 Jan 2006 11:10:04 -1000 Randy Bush <randy@psg.com> wrote:
You are using a crossover cable right?
I'm having a right mare trying to get a Foundry BigIron to connect up to a cisco 2950T, via Gigabit copper.
i was under the impression that gige spec handled crossover automagically
According to "Ethernet, The Definitive Guide", that feature is an optional part of the spec. One thing I've heard people encounter is that if they use a cross-over cable, which probably really implies a 100BASE-TX cross-over, then the ports only go to 100Mbps. A Gig-E rated straight through, in conjunction with the automatic crossover feature, was necessary to get to GigE. Regards, Mark. -- "Sheep are slow and tasty, and therefore must remain constantly alert." - Bruce Schneier, "Beyond Fear"
Hi Randy,
On Sun, 15 Jan 2006 11:10:04 -1000 Randy Bush <randy@psg.com> wrote:
You are using a crossover cable right?
I'm having a right mare trying to get a Foundry BigIron to connect up to a cisco 2950T, via Gigabit copper.
i was under the impression that gige spec handled crossover automagically
According to "Ethernet, The Definitive Guide", that feature is an optional part of the spec.
One thing I've heard people encounter is that if they use a cross-over cable, which probably really implies a 100BASE-TX cross-over, then the ports only go to 100Mbps. A Gig-E rated straight through, in conjunction
And a GE rated cable is CAT5. Non transmission is using multi mode and all long haul transmission uses single mode. If you review the gig spec, it was designed for CAT5. Regardless, I always use CAT6 and I stick with the standard ethernet caps although I tend to go upscale on the caps and the compresssion tools i.e. calibrateable and matching to caps. For example, at mumble carrier, we spent weeks in the labs qualifying cable, caps, and crimpers - copper and coax - and then making it a systemwide standard for techs and vendors. Funny story though. Mumblecarrier had people walking by tugging on the new ds3 installations and they started falling out. The center managers started mailing each other and then all of a sudden the freakin' things were falling out all over the country. I went out to one of the datacenters, jacked up the test gear, and started looking at it. While I was sitting there being stumped as to what was happening, I watched no less than ten people walk by and tug on the cross connects. The next day, same thing and they'd look at me and go "SEE!!! THEY FALL OUT!!!!!". What had happened was mass cable hysteria. Once the center managers started telling each other to "pull on the xcons" they all started being stressed and then they had every tech pulling on them and if you pull on it enough - it will fall out. Thank you for allowing me that off topic spew. :-) -M<
According to "Ethernet, The Definitive Guide", that feature is an optional part of the spec.
One thing I've heard people encounter is that if they use a cross-over cable, which probably really implies a 100BASE-TX cross-over, then the ports only go to 100Mbps. A Gig-E rated straight through, in conjunction with the automatic crossover feature, was necessary to get to GigE.
A lot of cross over cables only cross pairs 1-2 with 3-6, leaving 4-5, and 7-8 as straight through. Gig-E uses all four pair.
( You can said that it means nothing but... (; ) I second that. I always crimp (or check) for it. Also watch for Cat 6 cabling ... 23 gauge is hell to crimp. 24 is livable but takes twice as much time to do than Cat 5e. (You have to cut that little plastic guide and the pairs are a bit more twisted) I just did a 72 pairs (BIXed + crimped) in Cat 6... And I'm still wondering if its that advantagious. Also: Anybody fix a cabling issue by using Cat 6 over Cat 5e? Let us know. ( There is nothing nicer than a POP on a diet... a fiber diet that is! ) Jeff Rosowski wrote:
According to "Ethernet, The Definitive Guide", that feature is an optional part of the spec.
One thing I've heard people encounter is that if they use a cross-over cable, which probably really implies a 100BASE-TX cross-over, then the ports only go to 100Mbps. A Gig-E rated straight through, in conjunction with the automatic crossover feature, was necessary to get to GigE.
A lot of cross over cables only cross pairs 1-2 with 3-6, leaving 4-5, and 7-8 as straight through. Gig-E uses all four pair.
-- Alain Hebert ahebert@pubnix.net PubNIX Inc. P.O. Box 175 Beaconsfield, Quebec H9W 5T7 tel 514-990-5911 http://www.pubnix.net fax 514-990-9443
participants (7)
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Alain Hebert -
David Hubbard -
Jeff Rosowski -
Mark Smith -
Martin Hannigan -
Randy Bush -
Sam Stickland