https://docs.oracle.com/cd/E19683-01/816-4094/ipqos-reference-150/index.html
Assured Forwarding (AF) PHB (IPQoS Administration Guide)
assured forwardingafphbadministrationguide
https://www.cse.wustl.edu/~jain/ietf/dpstdy.htm
Effect of Number of Drop Precedences in Assured Forwarding
An internet draft presenting a simulation study of the effect of having different number of drop precedences in an Assured Forwarding traffic class of...
number dropeffectassuredforwarding