Network Working Group J. Rosenberg
Request for Comments: 3219 dynamicsoft
Category: Standards Track H. Salama
Cisco Systems
M. Squire
Hatteras Networks
January 2002
Telephony Routing over IP (TRIP)
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2002). All Rights Reserved.
Abstract
This document presents the Telephony Routing over IP (TRIP). TRIP is
a policy driven inter-administrative domain protocol for advertising
the reachability of telephony destinations between location servers,
and for advertising attributes of the routes to those destinations.
TRIP's operation is independent of any signaling protocol, hence TRIP
can serve as the telephony routing protocol for any signaling
protocol.
The Border Gateway Protocol (BGP-4) is used to distribute routing
information between administrative domains. TRIP is used to
distribute telephony routing information between telephony
administrative domains. The similarity between the two protocols is
obvious, and hence TRIP is modeled after BGP-4.
Table of Contents
1 Terminology and Definitions .............................. 3
2 Introduction ............................................. 4
3 Summary of Operation ..................................... 5
3.1 Peering Session Establishment and Maintenance ............ 5
3.2 Database Exchanges ....................................... 6
3.3 Internal Versus External Synchronization ................. 6
3.4 Advertising TRIP Routes .................................. 6
Rosenberg, et. al. Standards Track [Page 1]
RFC 3219 Telephony Routing over IP (TRIP) January 2002
3.5 Telephony Routing Information Bases ...................... 7
3.6 Routes in TRIP ........................................... 9
3.7 Aggregation .............................................. 9
4 Message Formats .......................................... 10
4.1 Message Header Format .................................... 10
4.2 OPEN Message Format ...................................... 11
4.3 UPDATE Message Format .................................... 15
4.4 KEEPALIVE Message Format ................................ 22
4.5 NOTIFICATION Message Format ............................. 23
5 TRIP Attributes ......................................... 24
5.1 WithdrawnRoutes .......................................... 24
5.2 ReachableRoutes .......................................... 28
5.3 NextHopServer ........................................... 29
5.4 AdvertisementPath ....................................... 31
5.5 RoutedPath ............................................... 35
5.6 AtomicAggregate ......................................... 36
5.7 LocalPreference ......................................... 37
5.8 MultiExitDisc ............................................ 38
5.9 Communities .............................................. 39
5.10 ITAD Topology .......................................... 41
5.11 ConvertedRoute ........................................... 43
5.12 Considerations for Defining New TRIP Attributes ......... 44
6 TRIP Error Detection and Handling ....................... 44
6.1 Message Header Error Detection and Handling ............. 45
6.2 OPEN Message Error Detection and Handling ............... 45
6.3 UPDATE Message Error Detection and Handling ............. 46
6.4 NOTIFICATION Message Error Detection and Handling ....... 48
6.5 Hold Timer Expired Error Handling ....................... 48
6.6 Finite State Machine Error Handling ..................... 48
6.7 Cease ................................................... 48
6.8 Connection Collision Detection .......................... 48
7 TRIP Version Negotiation ................................ 49
8 TRIP Capability Negotiation ............................. 50
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