[c-nsp] EIGRP on mGRE/DMVPN

[Pete Lumbis]

I don't know what the numbers are but when it comes to the ISRG2 scale +
features + crypto does not end in a lot of happy network engineers

If you are looking at future growth as well I'd seriously consider ASR1k
with RP1, but talk to your SE to see if RP2 would be necessary.


On Fri, Nov 1, 2013 at 8:15 AM, Steve Housego <Steve.Housego at itps.co.uk>wrote:

> Hi all,
>
> Has anyone ever put more than 500 eigrp nieghbours over an mGRE(DMVPN)
> interface? If so on what hardware? Any issues encountered?
>
> Were looking at either a 3845 or an ASR1002, with approximatly 500
> neighbors on a single mgre interface but with potental to grow, we want to
> standardise our config so would prefer one tunnel endpoint.
>
> Based on the DMVPN design guide (see extract below) it suggests well under
> 500 as a maximum, but is dated in 2008... 5 years later and ASR's are
> reasonbly priced..
>
>
>
> http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/DMVPN_2_Phase2.html#wp38036
>
> "If the DMVPN subnet is configured with a /24 network prefix, the neighbor
> count is limited to 254, which is a safe operational limit. Beyond this
> number, a compromise is required to balance re-convergence with recovery.
> In very large EIGRP networks, it may be necessary to adjust the EIGRP hold
> time to allow the hub more time to recover without thrashing. However, the
> convergence time of the network is delayed. This method has been used in
> the lab to establish 400 neighbors. "
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