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RUNNING OUT OF PORTS:  Will Cisco Access Points Bottle neck if I trunk a single Cisco swich to a Cisco 4506E Chassis Switch

Posted on 2013-12-05
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Last Modified: 2016-02-18
Hello all,
As with many of us we are on budget constraints where we work.  I do not have budgets for increasing switching gear at different buildings and we have used all of our fiber runs.  The question is if all of my switchports are taken up by users on the Cisco 4506 Chassis and I trunk a single switch into the chassis.  I'm concerned that all of the 3502 Cisco AP's that are in the single switch will totally bottle-neck going through the single trunk port the is connected between the two switches.

Thoughts or ideas or ever so appreciated.

Hope to help you all in the future as well.

Thanks
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Question by:ghjs
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6 Comments
 
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Expert Comment

by:Steve
ID: 39698465
it could cause a bottleneck, but only if you feel the amount of traffic is sufficient to do so.

you don't mention how many APs there are, but take a look at their max bandwidth added up and see if it exceeds that of the switch ports that links the switches.

if you feel it could  be an issue it is best to consider using LACP (if the switches can do so) to combine more than one port for trunking.
this allows you to combine 2 or more ports into one virtual link, combining the bandwidth of multiple links.
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Author Comment

by:ghjs
ID: 39698496
Totalltonto,
Thanks for the quick reply.  I imagine at least 20-48 Access Points connected on the single switch.
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Steve earned 500 total points
ID: 39698540
That is quite a lot. you may end up with a bottleneck there....


those APs are N compatible so have a theoretical max of 300mbps each.
That's an unrealistic speed though and most get between 50-150mbps on N wifi.

lowest expected bandwidth:
20 APs X 50mbps = 1000Mbps (1 maxed-out 1gig trunk port)

highest realistic bandwidth:
48 APs x 150MBPS = 7200Mbps (eg just over 7 x 1gig trunk ports)
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Author Comment

by:ghjs
ID: 39698567
Totallytonto,
Yeah wireless is a big thing now and looking to place a lot of AP's but stuck with chassis and limited fiber.  Thanks so much for your take.  I will leave open for a day or so, but you will definitely receive points.

Thanks so much!!
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