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3550 GB1000-T to 3560 1000BaseTX SFP

 
 
william
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      03-05-2006
I can't believe it, no link light... The ios on both switches recognize
the hardware. (3550 has a ws-5483 (1000base-t) plugged into a 3560 sfp
port using a 1000BaseTX SFP (GLC-T) via a cat5e cable.)

No link light. IOS versions are stated as compatible.
3550: (C3550-I9Q3L2-M), Version 12.1(22)EA4
3560: (C3560-IPBASE-M), Version 12.2(25)SEB4

Swapped cables, tried hard coding speed and duplex too.

Any body had an issue like this before? Am I missing something easy?
I can't need a converter as they are both 1000 base-T..right?

Any help here is appreciated!

http://www.velocityreviews.com/forums/(E-Mail Removed)

 
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william
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      03-05-2006
And I have rebooted both switches as well....

 
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J
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      03-05-2006
Not to ask the obvious but it never hurts. You are using a cross-over,
aren't you?

J

 
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Martin Kiefer
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      03-05-2006

"J" <(E-Mail Removed)> skrev i en meddelelse
news:(E-Mail Removed) oups.com...
> Not to ask the obvious but it never hurts. You are using a cross-over,
> aren't you?
>


It should not be necessary to use a cross over cable. Both the 3550 and the
3560 has MDIX auto recognition. But both sides must be set to auto on both
speed and duplex?



--

Best regards

Martin Kiefer

www.kiefer.dk


 
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Merv
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      03-05-2006
But might be a wothwhile from a troulbeshooting perspective ....

 
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Merv
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      03-05-2006

For both switches, post the output of


1. show version

2. show interface <> ! for back-to-back switch connection interface

3. show run interface <>

4. show controllers ethernet-controller <interface-id> phy

 
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anybody43@hotmail.com
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      03-05-2006
> I can't believe it, no link light... The ios on both switches recognize
> the hardware. (3550 has a ws-5483 (1000base-t) plugged into a 3560 sfp
> port using a 1000BaseTX SFP (GLC-T) via a cat5e cable.)


> Various posts regarding crossover or not.


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
1000Tx needs all 4 pairs.

http://www.cisco.com/univercd/cc/td/...1/ol463001.htm
Auto-MDIX is not supported on SFP module interfaces
(Yes it's a different switch model, if you want better do your own
research

http://www.cisco.com/en/US/products/...0801897fe.html
The GBIC supports automatic medium-dependent interface
crossover (Auto-MDIX). The GBIC automatically detects the
required cable connection type (straight through or crossover)
and configures the connection appropriately.


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

http://www.cisco.com/univercd/cc/td/...nt.htm#1193977
"Auto-MDIX is disabled by default. When you enable Auto-MDIX,
you must also set the speed and duplex on the interface to
auto in order for the feature to operate correctly. Auto-MDIX
is supported on all 10/100 and 10/100/1000 Mbps interfaces
and on 10/100/1000 BASE-T/TX SFP interfaces."

 
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anybody43@hotmail.com
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      03-05-2006
> I can't believe it, no link light... The ios on both switches recognize
> the hardware. (3550 has a ws-5483 (1000base-t) plugged into a 3560 sfp
> port using a 1000BaseTX SFP (GLC-T) via a cat5e cable.)


> Various posts regarding crossover or not.


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
1000Tx needs all 4 pairs.

http://www.cisco.com/univercd/cc/td/...1/ol463001.htm
Auto-MDIX is not supported on SFP module interfaces
(Yes it's a different switch model, if you want better do your own
research

http://www.cisco.com/en/US/products/...0801897fe.html
The GBIC supports automatic medium-dependent interface
crossover (Auto-MDIX). The GBIC automatically detects the
required cable connection type (straight through or crossover)
and configures the connection appropriately.


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

http://www.cisco.com/univercd/cc/td/...nt.htm#1193977
"Auto-MDIX is disabled by default. When you enable Auto-MDIX,
you must also set the speed and duplex on the interface to
auto in order for the feature to operate correctly. Auto-MDIX
is supported on all 10/100 and 10/100/1000 Mbps interfaces
and on 10/100/1000 BASE-T/TX SFP interfaces."

 
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Walter Roberson
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      03-05-2006
In article <(E-Mail Removed). com>,
<(E-Mail Removed)> wrote:
>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
>1000Tx needs all 4 pairs.


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.
 
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Merv
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      03-05-2006
Be aware of "The Auto-MDIX feature is enabled by default on switches
running Cisco IOS Release 12.2(1SE or later. For releases between
Cisco IOS Release 12.1(14)EA1 and 12.2(1SE, the Auto-MDIX feature is
disabled by default."

 
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