Redirection and shortcut DMVPN

Hello

I'm trying to understand the DVMPN Phase 3 and I'm trying to get clarification on the two commands:

the PNDH IP forwarding

property intellectual shortened PNDH

Based on what I've read (shortcut for switching Enhancements for PNDH in networks DMVPN) something that I do not understand this article:

"When you use this feature, it recommended to configure the PNDH on all nodes DMVPN ip redirect command." This configuration may be useful in the case where the data traffic takes a path a spoke-to-talk-star".

Why would you redirect need on all nodes dmvpn? How would you have a situation where the traffic comes and leaves the same interfaces on a RADIUS if the NHS and the route summary pointing to the Hub router?

Is there a setting I'm missing?

Thanks in advance for your help.

Hello

for a simple and structured topology (see diagram 1 below), I agree with your observation. Configure all hubs with ip PNDH redirect only and all sites to talk with ip shortened PNDH.

(Diagram 1 - Simple topology)

Hub 1-2

! ! ! ! ! !

! ! ! ! ! !

S1 S2 S3 S4 S5 S6

Hub of 1 and 2, configured with ip PNDH redirection only

Spoke of S1 to S6 configured with ip only shortened PNDH

However, to meet the more complex topologies such that where the RADIUS can also act as a hub other rays, so I guess redirect times PNDH ip and ip PNDH shortcut would be necessary on these rays/hub.

(See diagram 2 - complex topology)

1 Hub - hub 2

! ! ! !

! ! ! !

S1 S2 S3 S4

! !

! !

S5 S6

S1 is a Hub 1 RADIUS

S1 is a hub to S5 and S6

So S1 would have ip PNDH redirection as a shortcut of PNDH active ip.

see you soon

George

Tags: Cisco Security

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