What Switch should i Pick?

By R_O_L_A_N_D ·

I've got handed the responsibility of setting up the network infrastructure for a company.
i want the network to be an all Gigabit network, hence i used CAT6 cables that reach 18 patch panels in 3 racks with 6 patch panels each.
the sum of ports is as such : (3*6*24)
right now i have one Linksys SRW2024 switch 48 ports 10/100/1000.

with my situation explained, i need your advice concerning the following:

a. what type of additional switches should i purchase?
b. If i want to get rid of storming, and possible congestion of one rack not to propagate to another, should i purchase a layer 3 switch, or such protocols exist on a layer 2 switch?

my network traffic would consist of the following:

1. Big Data transfers
2. Audio/Video Streaming
3. Voip (IP based PBX)
4. normal internet usage.
5. Virtual hosts hosted locally.

any advice would be greatly appreciated

PS: should i daisy chain the switches? or is there any other way to connect them together?



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A couple of possibilities

by DomBenson In reply to What Switch should i Pick ...

To a great extent it's going to depend on how much you're prepared to spend!

To answer (b) first, Layer 2 switches supporting the [Multiple] Spanning Tree Protocol will prevent broadcast storms from multipathing, VLANs will limit the scope, and quite a few have storm control features that will stop forwarding broadcasts if a threshold is exceeded. Also, LAG and LACP (802.3ad) allow multiple active redundant links between a pair of devices without storming.

To get back to (a), I would look at the HP Procurve 2**0al-48G or 3500yl-48G-PWR.
Both are 48 port GbE + up to 4 10Gb.
The 2**0 is layer 2, but has exceptionally low latency. The 3500 is layer 2-4, stacking, but with slightly poorer throughput and latency.

In either of these cases, I would have one (with all 4 10G ports) at the top of each rack, and two others (possibly with just 2 10G) further down. Have a 10G link between the pairs of racks and from the top-of-rack to each of the other two switches in each rack. You could add the missing links to have a loop in each rack and round all three and use STP to have link redundancy, but I probably wouldn't bother, as they'd be using the same interface modules for both.

If you're worried about the overall throughput of that, e.g. if you have a large proportion of cross-rack traffic, you could put a 6600 at the top of the centre rack (it has 6-8 10G ports only), and have dual 10G uplinks to it from the head of each of the three groups of switches.

Does any of that sound promising?

Be interesting to hear what you decide and how it goes.

Good luck!

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