4.1.d Implement and troubleshoot DMVPN [single hub]

4.1.d [iv] Pre-classify

Configure qos pre-classify in VPN designs where both QoS and IPsec occur on the same system and QoS needs to match on parameters in the cleartext packet other than the DSCP/ ToS byte.

Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 4647-4648).  . Kindle Edition.

http://www.cisco.com/en/US/docs/solutions/Enterprise/WAN_and_MAN/DMVPN_1.html