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Which router to use for 100Mbps download and 20Mbps upload?

                   I need to upgrade one of our locations to a 100Mbps download/20Mbps upload circuit.

Which Cisco router should I use to meet the speed requirements?

The router handles basic NAT rules for email and VPN.  No special configuration other than that.

I have had vendors recommend a cisco 1921, 1941 and even 3900 series 9which seems like overkill).

Any thoghts/suggestions would be appreciated.

4 REPLIES
Super Bronze

Re: Which router to use for 100Mbps download and 20Mbps upload?

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In the attached documented, for 120 Mbps of aggregate bandwidth, the closest Cisco recommendation would be for a 2921 (50 Mbps, duplex) or a 2951 (75 Mbps, duplex).

Assuming your usage is lighter than 100% utilization, in both directions, you can downsize for your expected usage.  Although realize your router may struggle, and performance suffer, when dealing with sustained bursts of traffic.

Hall of Fame Super Bronze

Which router to use for 100Mbps download and 20Mbps upload?

Packet size does matter and VPN will demand more power.

Here is some testing I did earlier this year on 3945 ISR G2

3945Onboard VPN
Packet size / BytesInput Rate / bpsInput Rate / ppsOutput rate / bpsOutput Rate / ppsCPU
51213144000300013144000300025%
51221916000500021916000500036%
25615180000650015175000650045%
2562335600010000233560001000065%
1281574300012001157440001200176%
641200400015005120040001500591%
641439700017996126870001586096%
Super Bronze

Which router to use for 100Mbps download and 20Mbps upload?

How's your bps computed?

I.e. 512 bytes * 8 bits/byte * 3,000 pps = 12,288,000 bps or 64 bytes * 8 bits/byte * 15,005 pps = 7,682,560 bps.

Hall of Fame Super Bronze

Which router to use for 100Mbps download and 20Mbps upload?

You need to account for the IPSec overhead.

The table was populated with the 'show int' and 'show proc cpu' outputs.

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