RE: Problems connectivity GE on Foundry BigIron to Cisco 2950T

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1

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

2

Hi,

Yup, it's definately a cross-over cable. :wink: I had already tried this suggestion but the cisco 2950T doesn't appear to have the "no nego auto" command :confused:

(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

3

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

4

Hi Randy,

> 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.

5

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.

6

( 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: