The RSVP protocol is described in RFC 2205 [#!RFC2205!#]. This document is quite big (about 100 pages), and this sections summarises its main aspects. Several extensions are described in other RFCs or Internet Drafts: cryptographic authentication [#!RSVP_crypto!#], extensions for the IP Security (IPSEC) protocols [#!RFC2207!#], a Management Information Base (MIB) [#!RSVP_MIB!#,#!RFC2206!#], etc.