Shaping / Hardware / Software / Queueing 2851 / 3825

Unanswered Question
Oct 23rd, 2007

Hi there,

i'm planning to use shaping to the outside of an 100 Mbps link. The router should a vpn tunnel.

I found out tht both models can encrypt with the following speeds:

2851 until 100 Mbps


3825 until 140 Mbps

Process Switching | CEF Switching

Model PPS Mbps PPS Mbps EOS

2851 15,000 7.68 220,000 112.64 No

3825 25,000 12.8 350,000 179.20 No

I want to configure shaping on the VPN interface to the outside. Is there any limitation in hardwarequeuing or softwarequeueing i will face regarding the cpu power of these routers?

I could not find any document about shaping performance of both routers.



I have this problem too.
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Paolo Bevilacqua Tue, 10/23/2007 - 04:21


Shaping is done in software. however, both models, and even smaller ones, are perfectly able to do what you want.

Hope this helps, please rate post if it does!

c-fwagner Tue, 10/23/2007 - 04:27

Hi p.bevilacqua,

thanks for your answer.

What would you suggest taking the 2851 or the 3825 with aim module. The 2851 is a bit cheaper but already at it limits with 100 Mbps encryption. The 3825 can encrypt tpcmix until 140 Mbps so there is a reserve. What would be the better choice regarding possbile upgrades in the future?




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