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How many spoke routers can Cisco DMVPN scale to?

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.

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Hall of Fame Guru

Yes, I have seen reports of

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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Hall of Fame Guru

Yes, I have seen reports of

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)

View solution in original post

Cisco Employee

Just to add to Marvin's point

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. 

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