connecting cisco 3750g to 2960s via fiber

MzFire
MzFire used Ask the Experts™
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Hello
We have a switch stack of 4 Cisco 3750G switches and I will be running about 200 ft of fiber  SFP MM Duplex from one of those switches(switch A) to a brand new Cisco 2960 (switch B).   I have never done anything like this before so I am very excited and a little nervous.  

Switch B is a managable switch but I don't want to manage it, I need it to be a dummy switch to pass through data or should I manage it will that give me faster access

Switch A is an internal switch that is not hooked up to the internet.

Can someone help me with this or point me to a place I can find more information about doing this type of connection.....
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SouljaSr.Net.Eng
Top Expert 2011
Commented:
Connecting Fiber to another switch isn't much different then if you ran copper. They are just to different mediums. If you want to just want it to be  a dummy switch then just make sure the two ports you are connnecting are access ports on the same vlan (assuming you have multiple on the switch stack). By default all of the ports on the 2960 will be vlan 1, so change the the fiber and all of the other ports to the appropriate vlan that is on the 3750.
SouljaSr.Net.Eng
Top Expert 2011

Commented:
Oh, and I would advise to manage the switch. This way you can access it remotely and make any changes that come up later, instead of having to be locally at the switch.
System Administrator
Top Expert 2011
Commented:
You are on right track, please make sure followings;

if you are using MM fiber than USE MM module for Cisco switches
if you are using SM fiber than USE SFP module for Cisco switches

if you dont have VLAN in your network, you can ne need to do any configration on switch, but if you have you may need to assign IP on C2960G. see below for VLAN or Etehr channel configration

For VLAN
http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008015f17a.shtml

For Etherchannels
http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094953.shtml


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SouljaSr.Net.Eng
Top Expert 2011

Commented:
Just to add on what Syed said.

Yes, use the correct SFP modules. Make sure that the SFP module is MM and not SM. Also, yes, if you need to manage the switch create a VLAN interface and assign an ip address on the subnet that the 3750's vlan reside on.

So:
interface vlan x
ip address x.x.x.x 255.255.255.0 (Assuming)
no shut

Author

Commented:
Hello and thank you for the quick reply.  We do have VLAN in our envoirnment.  Oh yeah it LC/LC connection.

Soulja...... you are assuming that I have done copper before well I have not.....:[....

Syed.......thank you for links I am doing my research on this.  

Like I said I have never done this before and I am excited that I get to do it now.  It has been along time since I programed a switch so I am alot rusty........
SouljaSr.Net.Eng
Top Expert 2011

Commented:
"Soulja...... you are assuming that I have done copper before well I have not.....:[...."

What do you currently have plugged into the 3750 switch. You have copper twisted pair going to your clients, servers, etc. Correct? That is what I meant. Fiber is really no different when it comes to configuring the ports.
Another tip when you connect the fiber modules, if the link light does not come ON.  Switch your fiber leads around.  XMIT to RCV and vice versa.  It gets me all the time.
SouljaSr.Net.Eng
Top Expert 2011

Commented:
@shadowmantx

If he is using LC/LC that should be and issue since you can only plug them in one direction. Now LC/SC or SC/SC, then you run into those TX/RX issues.
SouljaSr.Net.Eng
Top Expert 2011

Commented:
I meant : If he is using LC/LC that shouldn't be and issue since you can only plug them in one direction.

Author

Commented:
Syed............the module we are using is Cisco GE SFP LC CON SX so I am a little confused.....is this the right module
SouljaSr.Net.Eng
Top Expert 2011

Commented:
That module should work for you.
Syed_M_UsmanSystem Administrator
Top Expert 2011

Commented:
if you are using Multi Mode fibre than this should be fine, make sure you have this part #
GLC-SX-MM (GE SFP, LC CONNECTOR SX TRANSCEIVER).

i would also sugegst you check with Local Cisco partner and verify.
Top Expert 2014

Commented:
You can get LC/LC polarity mixed up.  It not only depends on the patch cables, but also the structured cabling between patch panels.  I've worked at hundreds of sites and this is a common problem with all common connectors (ST, SC and LC).

Anyhow, the modules will be fine as long as they are 1000Base-SX.  The module to use is GLC-SX-MM in both switches in this instance.  If the link doesn't come up first time, swap the plugs over at one end of the link.  It might be a bit fiddly to unclip the retainer on the cable but it will come undone with a little force.

Author

Commented:
Ok got it GLC-SX-MM.  Now ya make it seems like all I have to do is plug the fiber both switches and put switch B on the same vlan as switch A and everything should be okay.  I am sure once I get more into this I will have more questions.
Syed_M_UsmanSystem Administrator
Top Expert 2011

Commented:
you are right, but i would suggest you close this case and if you have more questions in future please open new case.

you may have question relating Vlan and Etehrchannel and for that you can refer to my first post.

Thank you

Commented:
You can also find good tech specs on Cisco GLC-SX-MM here:

http://shop.vds.com/products/16931-cisco-glc-sx-mm.aspx

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