Solved: Just to add to Marvin's point

emaadnakhwa · ‎06-05-2014

How many Branch Routers can 1 ASR Router scale to with EIGRP and IPSEC? Some Cisco documents say it can support up to thousands of spoke routers with EIGRP and IPSEC sessions.

Marvin Rhoads · ‎06-05-2014

Yes, I have seen reports of as many as 20,000 spokes if they are low bandwidth (for example, ATM machines) and not actively routing.

You will more likely hit a limit due to routing when using EIGRP. According to a presentation from Cisco Live this year (BRKSEC-4054, slide 18), the number would be somewhere between about 1200 and 4000, depending on your model.

Also note your router encryption maximum throughput. For an ASR it varies according to CPU and ESP - the range is from ~1 Gbps (ASR 1001/RP2/Integrated) to over 16 Gbps (ASR 1006+/RP2/ESP100)

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Marvin Rhoads · ‎06-05-2014

Yes, I have seen reports of as many as 20,000 spokes if they are low bandwidth (for example, ATM machines) and not actively routing.

You will more likely hit a limit due to routing when using EIGRP. According to a presentation from Cisco Live this year (BRKSEC-4054, slide 18), the number would be somewhere between about 1200 and 4000, depending on your model.

Also note your router encryption maximum throughput. For an ASR it varies according to CPU and ESP - the range is from ~1 Gbps (ASR 1001/RP2/Integrated) to over 16 Gbps (ASR 1006+/RP2/ESP100)

Marcin Latosiewicz · ‎06-05-2014

Just to add to Marvin's point, BGP is what is needed to scale best on all platforms. This applies to both DMVPN and FlexVPN.

How many spoke routers can Cisco DMVPN scale to?