@misc{rfc5384, series = {Request for Comments}, number = 5384, howpublished = {RFC 5384}, publisher = {RFC Editor}, doi = {10.17487/RFC5384}, url = {https://www.rfc-editor.org/info/rfc5384}, author = {A Boers and IJsbrand Wijnands and Eric C. Rosen}, title = {{The Protocol Independent Multicast (PIM) Join Attribute Format}}, pagetotal = 10, year = 2008, month = nov, abstract = {A "Protocol Independent Multicast - Sparse Mode" Join message sent by a given node identifies one or more multicast distribution trees that that node wishes to join. Each tree is identified by the combination of a multicast group address and a source address (where the source address is possibly a "wild card"). Under certain conditions it can be useful, when joining a tree, to specify additional information related to the construction of the tree. However, there has been no way to do so until now. This document describes a modification of the Join message that allows a node to associate attributes with a particular tree. The attributes are encoded in Type-Length-Value format. {[}STANDARDS-TRACK{]}}, }