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ShawnLK
1 Copper

Connecting 2x 2724 using SFP ports

Hi Everyone
 
Is it possible to link 2 PowerConenct 2724 switches using the SFP ports? We have this config but are unable to get the switches to keep the fiber link up for more than 10 Secs.
 
Thanks!
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11 Replies
DELL-Cuong N.
4 Tellurium

Re: Connecting 2x 2724 using SFP ports

Can you give me a bit more info about your setup and please tell me how you are configuring your switches?  I just tried connecting using the SFP between two 2724 and I'm not seeing the problem you are describing.  When you say you can't maintain links between the switches, how do you determine this state?  Did the link light goes out or something else?
 
Also did you verify your fiber cable?  Sometime bad cable might cause such a problem.
 
Cuong.
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DELL-Cuong N.
4 Tellurium

Re: Connecting 2x 2724 using SFP ports

Also can you tell us whether you are using Dell branded SFPs?  We only support certain SFPs for this switch.  Finally, since the SFP ports are combo ports with copper port 23 & 24.  Did you also plug in something to the copper ports 23 & 24?
 
Cuong.
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ShawnLK
1 Copper

Re: Connecting 2x 2724 using SFP ports

Thank Cuong for the reply. I need to get back to you regarding the SFP's, I just wanted to know whether it was possible to link the two switches with the SFP ports. We're almost sure it shouldn't be a problem, so we called Dell locally and the consultant said it was not possible to cascade the switches in that manner, we needed some verification.

Thanks again

Regards

Shawn

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ShawnLK
1 Copper

Re: Connecting 2x 2724 using SFP ports

Hi

We got it up and running, we enabled the management and sorted out a network loop.

Thanks

Shawn

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ShawnLK
1 Copper

Re: Connecting 2x 2724 using SFP ports

Hi

It seems like the switches aren't working in this configuration. The switches are using the Dell SFP's, we're using port 24 on both switches, we've eliminated any network loops. The seem to connect fine for about 2-3 hours than they lose connection to each other.

Can you verify for us that stacking the switches in this manner is a supported configuration?

Regards

Shawn

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ShawnLK
1 Copper

Re: Connecting 2x 2724 using SFP ports

Hi

Oh, also, there are no copper connections in port 23 and 24 on both switches.

Regards

Shawn

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DELL-Cuong N.
4 Tellurium

Re: Connecting 2x 2724 using SFP ports

I'm not sure I understand what you mean by stacking.  The 27xx does not support stacking in the sense of stacking feature supported in 33xx or 34xx.  When we refer to stacking in switching technology we are talking about stacking two switches so that the ports on the switch can be managed as if they were from the same switch.  This requires coordination between the two switches so that you can do things such as creating a LAG (link aggregation group) which contain ports from both switches.

If you are referring to this type of stacking then the 27xx does not support this feature.  If this is not what you mean please explain your definition of the term stacking.

Cuong.

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ShawnLK
1 Copper

Re: Connecting 2x 2724 using SFP ports

Hi
 
Sorry about using the stacking terminology, no, we're not trying to stack the switches. We have 2x 2724's, one in each building with PC's in each building. We have a fiber link between the two buildings. We've had the fiber link tested, the guys who tested the link said that the link was surprisingly "clean", and was better than expected. We're trying to reliably connect the two switches using the fiber ports.
 
Regards
Shawn
 
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DELL-Cuong N.
4 Tellurium

Re: Connecting 2x 2724 using SFP ports

Hi,

On my test switches I connected two 2724 using the SFP port (port 24 only - and no copper in either port 23 or 24).  I left this up overnight without any error.

Can you provide me more info please?  Such as any configuration you have for the ports on the switches (did you setup auto-negotiation on the port for example).  When you say that the switches lose connection what do you mean exactly?  Is it:

  • You lost link on the SFP ports?
  • You could not send packet through the SFP ports - meaning that ethernet packets no longer pass through the switches but link remain up?
  • You could not communicate with the management web interface on the switches (assuming you did configure the two switches with different management IP address so that there is no overlap)?

Cuong.

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