This string names a list of AS numbers, defined elsewhere, that this policy term's action prepends onto a matching route's AS path; a NULL string means this action is unused. An admin uses AS-path prepending to make a route appear to have traversed extra hops, artificially lowering its attractiveness to other ASes for traffic-engineering purposes. For example, setting csRtPolicyTermActionBgpASPathName to a list that repeats the local AS number three times de-preferences a backup path advertised to a peer.