I am new to DMVPN but have performed extensive research to understand the ins and outs of this technology starting with phase 1, 2 and now phase 3. I have taken the time to understand the technology, each command, related syntax, design options and scalability considerations.
The command IP NHRP SHORTCUT appears in the phase-3 documentation and Cisco provides very little details on this command. Cisco has forgotten to provide real details on this option and it seems to be sort of important in spoke-to-spoke communications. Cisco's command lookup tool reveals nothing useful nor does a web search. I see IP NHRP REDIRECT is used on phase-3 HUBs -used to redirect spoke-to-spoke communication. Cisco documented this command fairly well; and these two commands always seem to appear together for phase-3.
Cisco Command tool
Do not configure this command if the DMVPN network is configured for full-mesh. In a full-mesh configuration the spokes are populated with a full routing table with next-hop being the other spokes.
Can anyone help?