09-06-2012 01:05 PM - edited 03-07-2019 08:44 AM
Hi,
our network is spread over 15 floors and each floor we have 5-6 switches. we are planning to purchase cat3750-x 24 ps poe with C3KX-NM-10G network modules. Each floor has two up links to the core switch with single mode fiber and other being the multimode.Suppose if we are purchasing 75 switches do we have to purchase 75 C3KX-NM-10 G modules.? or can we limit our purchase with 15 C3KX-NM-10G sothat two uplinks from each floor can be made? since network modules are optional cost factor is invovled. Or any issue with stacking ? the SFPs will be LR and LRM MODULES.looking for an answer ?
another question is whether the new usb type console cable comes bundled with cat350x or shall we have to order separately?
Regards
prakavi
Solved! Go to Solution.
09-06-2012 01:32 PM
Hi,
First, the console cable comes in the box.
As for your 10gig modules, if the switches are stacked in each floor you can than only buy the module for the 1st switch in the stack and the last switch. If your switches are not stacked than you need to buy one module per 3750.
Also use LR
SFP-10G-LR for single mode fiber.
HTH
09-07-2012 05:06 AM
Hi,
Let me explain this again.
if we use stackwise option do we need two network in every floor?
No, not neccessarly, you can just uplink one switch in the stack and that means you only need one network module for that stack. Remember each module comes with 2 10Gig ports. so, even though you are using one switch, but still 2 ports.
Can the two uplinks run from one switch with one network module ?
yes, as mentioned above
In fact I didnt understand the concept of using two network modules every floor.Can you kindly elaborate?
So, let say you have a stack of 5 switches in one floor, you can buy a network module for switch 1 in the stack and switch 5 and uplink 2 ports from the switch 1 and 2 ports from the switch 5 using an Etherchannel. This will give redundancy, so if switch 1 fails, switch 5 will still continue forwarding packets. This is just for an example, you don't have to use switch 1 and 5, you can use 2 and 3 or 3 and 4 or any combination you want.
HTH
09-06-2012 01:32 PM
Hi,
First, the console cable comes in the box.
As for your 10gig modules, if the switches are stacked in each floor you can than only buy the module for the 1st switch in the stack and the last switch. If your switches are not stacked than you need to buy one module per 3750.
Also use LR
SFP-10G-LR for single mode fiber.
HTH
09-06-2012 10:16 PM
hi,
Thanks a lot for the reply.Since 10gnetwork module comes with 4 sfps(one LR AND LRMcan be used for every floor) and if we use stackwise option do we need two network in every floor? Can the two uplinks run from one switch with one network module ? In fact I didnt understand the concept of using two network modules every floor.Can you kindly elaborate?
if we are not stacking what type of connector is required to interconnect the switches?
Regards
prakavi
09-07-2012 05:06 AM
Hi,
Let me explain this again.
if we use stackwise option do we need two network in every floor?
No, not neccessarly, you can just uplink one switch in the stack and that means you only need one network module for that stack. Remember each module comes with 2 10Gig ports. so, even though you are using one switch, but still 2 ports.
Can the two uplinks run from one switch with one network module ?
yes, as mentioned above
In fact I didnt understand the concept of using two network modules every floor.Can you kindly elaborate?
So, let say you have a stack of 5 switches in one floor, you can buy a network module for switch 1 in the stack and switch 5 and uplink 2 ports from the switch 1 and 2 ports from the switch 5 using an Etherchannel. This will give redundancy, so if switch 1 fails, switch 5 will still continue forwarding packets. This is just for an example, you don't have to use switch 1 and 5, you can use 2 and 3 or 3 and 4 or any combination you want.
HTH
09-07-2012 05:55 AM
Dear Reza,
Thank you very much for your explanations. So I am planning to buy 30 10G network modules for 75 switches. So every floor will have two network modules .Even if one netwotk module/switch fails redundancy can be achieved. As you mentioned from the stack 1st witch will run aLR uplink and 5 th switch will run a LRM uplink.
once agian thank you for the explanations and taking time and effort.
Best regards
Prakavi
09-07-2012 06:19 AM
Hi Prakavi,
Glad to help.
LR uplink and 5 th switch will run a LRM uplink.
Please use LR for all switches, as it will reach up to 10 kilometers. No need for LRM. In addition, for troubleshooting purposes, you want to keep all your optics the same.
Good Luck
Reza
09-06-2012 04:12 PM
another question is whether the new usb type console cable comes bundled with cat350x or shall we have to order separately?
USB console cable is ordered separately.
Alternatively, you can go to your nearest/favorite electronics shop and get the cable.
09-07-2012 10:49 AM
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BTW, if these floor switches are for typical users, you might be able to save on costs. For example, 1st you need to determine whether you really need 10g at all. It provides nice bragging, but it's still pricy. You might find dual gig etherchannel is perfectly adequate.
Another possible option would be one uplink is 10g and the second is gig.
PS:
Not 100% possible, but unsure the suggestion to use just 10g LR optics will work on your MM cable although the 10g LRM might work on either your MM and SM.
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