3.3.c [iii] Path vector
A path vector protocol is a routing protocol which maintains the path information that gets updated dynamically. Updates which have looped through the network and returned to the same node are easily detected and discarded. This algorithm is sometimes used in Bellman– Ford routing algorithms to avoid “Count to Infinity” problems. BGP is an example of a path vector protocol.
Adam, Paul (2014-07-12). All-in-One CCIE V5 Written Exam Guide (Kindle Locations 2668-2670). . Kindle Edition.