OT: DMVPN limitation

From: sheherezada@gmail.com
Date: Thu Sep 13 2007 - 16:46:09 ART


Hi,

Sorry for this off topic, but maybe some of you can redirect me to an
useful resource.

I am planning to deploy from scratch a DMVPN setup and want to
understand the limitations regarding the number of tunnels.

In short:

- 500 spokes - Cisco 877, no physical backup circuits
- 2 hubs, daisy chaining. Basically, I want to ensure that a hub is
always available.
- 3-4 Mbps aggregate bandwidth (that's right, each spoke user has only
a terminal emulator, so it's low bandwidth consumption)

I am planning to use Cisco 3845 for the hubs, but as far as I can read
on the Internet, even a Cisco 7200 with NPE-G1 is limited to 350 DMVPN
tunnels?! Is this because of CPU usage when a major re-convergence
occurs or something else relative to EIGRP? I can't imagine using a
larger box only for several megabits of traffic...

Thanks,

Mihai Dumitru
CCIE #16616 (SP, R&S)



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