[c-nsp] EIGRP on mGRE/DMVPN

[Iwanski, Edward E]

Steve,

I would highly recommend the ASR (and yes the design guide needs a major update).  We easily run well over 1k peers/neighbors with ease on ASR 1004/RP2, no issues at all.

If you are looking into the 1002, I would look at the newer 1002-X as this one has next generation processing that is easily upgradable via software license, and from what I have read on specs the base model should be able to handle it depending on your throughput needs.

Good luck,

Ed


-----Original Message-----
From: cisco-nsp [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Steve Housego
Sent: Friday, November 1, 2013 7:15 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] EIGRP on mGRE/DMVPN

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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