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aggregation and trunking among switches

Posted on 2013-01-30
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Last Modified: 2013-02-14
I have a pretty simple office config. Overall 300 users spread among 4 suites. About 4 switches in each suite. In the suites they are connected through gig nics, and across suites by fiber.  There are 4 vlans total. I'm trying to optimize speed as much as possible. My question is this

would it be best or even make a difference if i aggragated the fiber links amongst offices. So instead of idential trunks in g1 and g2, i did one trunk and aggregated them and repeated that in each suite. then what if i did so for the gig uplinks between switches in each suite, would doing things like that make a difference?
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Question by:mrbayIt
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by:rauenpc
ID: 38838047
Perhaps I'm simple minded, but could you draw a picture of your before and after? I'm unsure how all the switches are all connected together. Are any switches stacked? Is the aggregation between switches within a suite or between suites?
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by:mrbayIt
ID: 38838054
think of it in pairs and clusters. 4 suites. fiber pairs connected to each cluster of switches within the suites which themselves have 4 switches in each. currently there are no aggregations
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rauenpc earned 500 total points
ID: 38838096
Although there is usually nothing wrong with aggregation in your situation, it may not provide any additional throughput. The way that the algorithm works causes any single session to only utilize one physical link, but when you have numerous sessions going on simultaneously you will use both physical links and therefore be able to accomplish a total throughput greater than that of a single link.

So if you aren't maxing out any links currently, you probably won't notice any difference in performance, but would be able to increase the amount of traffic pushed between the switches in the future without additional changes. Failover from one link to another is faster than letting spanning tree do its thing so that's a definite benefit.
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