As of this writing, the BGP Path Attributes registry maintained by
IANA contains entries for DPA, ADVERTISER, and RCID_PATH /
CLUSTER_ID. The first of these is associated with [BGPDPA], an
Internet-Draft that was abandoned in 1996. The latter are associated
with [RFC1863], an RFC that was reclassified as Historic by [RFC4223]
in 2005. Neither specification is currently in use, nor have they
Note that the deprecated CLUSTER_ID is distinct from CLUSTER_LIST
[RFC4456]. CLUSTER_LIST is not being deprecated.
Per this document, IANA has marked the BGP Path Attributes registry
entries for DPA (Value 11), ADVERTISER (Value 12), and RCID_PATH /
CLUSTER_ID (Value 13) as "deprecated".
There are no meaningful security consequences arising from this
[BGPDPA] Chen, E. and T. Bates, "Destination Preference Attribute
for BGP", Work in Progress, March 1996.
[RFC1863] Haskin, D., "A BGP/IDRP Route Server alternative to a full
mesh routing", RFC 1863, October 1995.
[RFC4223] Savola, P., "Reclassification of RFC 1863 to Historic",
RFC 4223, October 2005.
[RFC4456] Bates, T., Chen, E., and R. Chandra, "BGP Route
Reflection: An Alternative to Full Mesh Internal BGP
(IBGP)", RFC 4456, April 2006.