DMVPN Daisy-chain NHS servers

[Mikael Gustafsson]

Hi all,

I need some clarification on dasy-chaining NHS servers in DMVPN, when and why I need to to this.

Is it in only phase 2 and only with particular types of design?

For example if I have a two hub's with only one DMVPN cloud each, were spokes have connection to both of these for redundancy.

Cheers

[Marcin Latosiewicz]

Mikael,

What problem are you looking to solve? Maybe it's better to use phase 3 design with (optional) redundancy on NHRP level?

M.

[Mikael Gustafsson]

Hi Marcin,

Yes phase 3 would probably be the best, but this is more for me to understand the technology and be able to talk about why using or not using a design.

Cheers

[Andrew Phirsov]

Daisy chaining to my understanding may be required in single dmvpn cloud when some peers are registered with one nhs and some with the other. It's applicable to phase 2 when routing info (next hop ip) is preserved. So when one nhs has no info about NBMA addrress of some host it may query another nhs. I don't know why this might be used, cause there are better designes of dmvpn that doesn,'t require nhs-chaining.


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[Mikael Gustafsson]

Ok, yes I thought so, just had to verify :-)