Bandwidth Limitation on DMVPN tunnel interfaces

[dhirajgrover]

So in our DMVPN network, we have this Cisco 3845 hub router that is connected via a DS3 to the Internet, and our spoke sites usually have a broadband connection that typically have a maximum of 1Mbps upload capacity. We are getting ready to add a few more sites to our network that are connected to the Internet with 10Mbps upload speeds (and 50Mbps download). Spoke site routers are usually 800 series ISRs. We have seen spikes of 8-10Mbps on the hub router so far. So the question is that a site with 10Mbps upload speed transmit to the full capacity over a DMVPN tunnel or is it limited by other factors? What are those factors?

[Joseph W. Doherty]

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Posting

One major factor would be the particular 800 series model you're using.  Not all can push even 10 Mbps.

Another major factor would be crypto performance and whether you've optimized the DMVPN for optimal transfer rate (such as avoiding fragmentation).

[Leo Laohoo]

10 Mbps using 800 series?  The only one that will fit this would be the 890.  You have to be darn careful you will not be increasing the bandwidth.  The 890 can support up to 51.20 Mbps in un-encrypted and half duplex speed.  For full duplex and full encryption, the true value would be around 12 to 15 Mbps.

[dhirajgrover]

Thank you both. So is there a Cisco document referencing these limits?

[Joseph W. Doherty]

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

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In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

http://www.cisco.com/web/partners/downloads/765/tools/quickreference/routerperformance.pdf