DMVPN NHS

[Steven Williams]

What is the purpose of the NHS command on the spoke nodes in the DMVPN topology?

SPOKE-02(config-if)#ip nhrp nhs ?

  A.B.C.D   Protocol IP address of NHS

  cluster   NHS Redundancy cluster configurations

  dynamic   NHS protocol address dynamically learnt

  fallback  NHS Redundancy Fallback time

What does each one do? Why do I see this command in most config examples defining the hub?

[robert.germanovich]

according to the Cisco results when searching this command, they are used by NHRP on the spoke to advertise the spokes NHRP mapping to the hub. It says it decreases the need for more command-line-strings on the hub by a large number that would be required, to a small number of lines on the spoke node. I don't fully understand DMVPN yet myself. Good luck. I'll be following this string to see what others say.