10-19-2012 07:27 AM - edited 03-07-2019 09:34 AM
Hello All,
I have a simple design question. I have been asked to change a ring configuration to a star topology with a collapsed core/distribution layer.
The customer does not have the budget for fiber layer 3 switches so I am wondering if anyone has ever done this using fiber transceivers. Are there any gotchas or considerations I should keep in mind?
To be clear, I will give an example of one of the sites in question
There are 14 Wiring closets with a single switch in each closet.
The most central wiring closet is within 500 meters distance of 11 wiring closets (12 including itself of course)
The two remaining wiring closets are 600-700 meters away.
I was thinking of putting 2 X Cisco 3750x 48 port POE switches with 4 SFPs at the central location, configured using HSRP
Assume 2960 switches at all the remote locations.
I would have two fiber cables coming back from each remote location within 500 meters connecting into multimode transceivers at the core and split between the two core/distribution switches. At the remote side I would use standard multimode GBICs plugged directly into the switch.
The last two switches (the far ones) could be serviced in one of two ways
Single mode fiber back to the core using single mode GBICs both sides
Use multimode GBICs to bring them to the nearest two remote wiring closets. It's one extra hop but it would be a lot cheaper than using single mode fiber.
Questions
Many Thanks for taking the time to read this and any response would be appreciated.
10-19-2012 09:39 AM
You should use native fiber interfaces for all switches, not interface converters. There are also cisco-compatible brands for cost saving.
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