Likewise, I’d agree w/ Anthony here.

Virtual Chassis backplane is only 128Gbps (2x64Gbps), which seems like alot, but given how much of traffic the exchange is doing, could quickly become an oversubscribed bottleneck.
Also, have to factor in 24gbps of that to the other switch in the stack already to keep it non-blocking, so really only leaves 104Gbps.

Add 10+ 10g participants to a new 4500 in VC config, and you’ve got potential for oversubscription. Doesn’t really scale.

EX4500-UM-4XFP can be had for ~$1k on used market, and would buy some ports + time for the next revision of hardware to be decided on.

Andrew Hoyos
Hoyos Consulting LLC
ofc: +1 608 616 9950
[log in to unmask]
http://www.hoyosconsulting.com

On Dec 3, 2014, at 7:51 PM, Anthony Anderberg <[log in to unmask]> wrote:

We’d also talked about add-in modules for the current ex4500-40f switch that could add up to 8 more 10G ports in 2 group of 4 at a time as a temporary fix until our 4th generation hardware setup is ready.  I believe the part number is EX4500-UM-4XSFP, otherwise another switch and thoughtful port utilization to avoid over-stuffing the stacking cables is probably our best bet in the medium-term.
 
 
Anthony Anderberg
Sr. Systems Analyst
[log in to unmask]"><image001.gif>
320-234-5239
 
From: MICE Discuss [mailto:[log in to unmask]] On Behalf Of Jeremy Lumby
Sent: Wednesday, December 03, 2014 7:32 PM
To: [log in to unmask]
Subject: Re: [MICE-DISCUSS] Googling on IPv6 and HE to 20G
 
I think the low port count means that we need a switch sooner rather than later.  I know there is a formal proposal in the works, however another 4500 may be the quick solution, and if we look at it from the viewpoint of if all of our current traffic had to flow between switches, we would not max it out, so another switch could buy us some time, while still being able to utilize most of the ports before any real bandwidth limitations.  I think a call for donations/optional bill would draw in far more than enough cash.
 
Jeremy
 
From: MICE Discuss [mailto:[log in to unmask]] On Behalf Of Anthony Anderberg
Sent: Wednesday, December 03, 2014 7:15 PM
To: [log in to unmask]
Subject: [MICE-DISCUSS] Googling on IPv6 and HE to 20G
 
Yesterday Google turned up their IPv6 advertisements, and the rush of additional traffic required HE to add a second 10G port on the exchange - they now have Xe-0/0/3 and Xe-0/0/13 as LAG bundle Ae6.
Thanks to Jeremy for coordinating everything.
 
By my count we’ve got four free 10G ports on the main switch, plus a couple allocated that haven’t turned up.
 
 
Anthony Anderberg
Sr. Systems Analyst
[log in to unmask]"><image001.gif>
320-234-5239
 
 

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