3550 GB1000-T to 3560 1000BaseTX SFP

And I have rebooted both switches as well....

Not to ask the obvious but it never hurts. You are using a cross-over, aren't you?

"J" skrev i en meddelelse news: snipped-for-privacy@i39g2000cwa.googlegroups.com...

It should not be necessary to use a cross over cable. Both the 3550 and the

But might be a wothwhile from a troulbeshooting perspective ....

For both switches, post the output of

1. show version

1. show interface ! for back-to-back switch connection interface

2. show run interface

1. show controllers ethernet-controller phy

This is GBIC to an SFP module. Do they do MDIX?

If one of them does MDIX then you will be OK with a straight thru but I would _guess_ that you need a crossover cable. Recall that

Oh well, guessed wrong. Make sure "mdix auto" is not disabled.

This is GBIC to an SFP module. Do they do MDIX?

If one of them does MDIX then you will be OK with a straight thru but I would _guess_ that you need a crossover cable. Recall that

Oh well, guessed wrong. Make sure "mdix auto" is not disabled.

The gigabit standards *require* auto-mdix, at least for 1000BaseTX. It's one of the improvements of gigabit: that you never need a cross-over.

Be aware of "The Auto-MDIX feature is enabled by default on switches running Cisco IOS Release 12.2(18)SE or later. For releases between Cisco IOS Release 12.1(14)EA1 and 12.2(18)SE, the Auto-MDIX feature is disabled by default."

The GLC-T is supposed to support 1/0100/1000.

Will it connect to 1 Fast Ethernet port on the opposite switch?

tried bioth it is AUTO MDIX which means you can not screw that up.

I tried manually setting them and left both on AUTO, AUTO as well.... Good idea.

MDIX is auto on the SFP side for sure which is all that you need. I have solved the issue and its really interesting..

EVEN though the software recognized the hardware, the GBIC on the 3550 side. EVEN thought the software would let me force the GBIC in question to certain settings.. EVEN though I plugged and unplugged serveral times. EVEN though it "Clicked" each time I plugged it in to the 3550. : there was an issue with LAYER1. even though all of the things below led me to believe that it was physically connected properly, the GBIC snapped in place and was recognized and everything, it had about 1cm total side to side movement and when I pushed fairly hard to one side the light came up and it was humming!

So I have to implement this same thing; GBIC in 3 other 3550's switches this week and I will let all people know if it is a design flaw in the Module or not. (Becaise the the previous Fiber GBIC) was a tight fit.

Thanks for everyoneds help! Have a great week!

It was enabled by default on the 3560 SFP modules.

I did not try that although it would have been a great option if I had not got it working.

Did you buy the GBIC from Cisco ?

Who is the actuial manufacturer ?

it has a cisco sticker on it but I looked it up and here it is:

Do you have a Cisco Smartnet support contract ?

If so I would open a Cisco TAC case and report the difficulty you have encountered that GBIC.