1、 ETSI TR 101 803-10 V1.1.1 (2004-07)Technical Report Telecommunications and Internet converged Services andProtocols for Advanced Networking (TISPAN);Dynamic synchronous Transfer Mode (DTM);Part 10: Routeing and switching of IP flows over DTMETSI ETSI TR 101 803-10 V1.1.1 (2004-07) 2 Reference DTR/T
2、ISPAN-03003-DTM Keywords addressing, DTM, IP, switching ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N 348 623 562 00017 - NAF 742 C Association but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Importan
3、t notice Individual copies of the present document can be downloaded from: http:/www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Po
4、rtable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Informat
5、ion on the current status of this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editoretsi.org Copyright Notification No part may be reproduced except as authorized by written permission. The copy
6、right and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2004. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently
7、being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TR 101 803-10 V1.1.1 (2004-07) 3 Contents Intellectual Property Rights5 Foreword.5 Introduction 5 1 Scope 6 2 Reference
8、s 6 3 Definitions and abbreviations.6 3.1 Definitions6 3.2 Abbreviations .7 4 Service overview7 5 System overview 8 5.1 Topology based forwarding8 5.2 Flow based forwarding.9 5.3 IPOD interfaces 10 5.4 IPOD segments.11 5.5 Channels in IPOD.12 5.6 Base channel capacity 14 5.7 Interaction with routing
9、 protocols 14 5.7.1 OSPF.14 6 Service Interface.15 6.1 Service provided.16 6.2 Service required16 7 Detailed protocol description .16 7.1 IPOD interface parameters .16 7.2 Incoming channel properties 16 7.2.1 Channel type .17 7.2.2 Source IP address17 7.2.3 Filter specifications.17 7.3 Outgoing chan
10、nel parameters .18 7.4 IPOD interface operation18 7.4.1 IPOD interface startup 18 7.4.2 IPOD interface shutdown18 7.4.3 Establishing an IPOD channel 19 7.4.4 Establishing base connection 19 7.4.5 Establishing dynamic channels.20 7.4.6 Receiving a channel20 7.4.6.1 Receiving a channel for a base conn
11、ection20 7.4.6.2 Receiving a dynamic channel20 7.4.7 Remote teardown of an incoming channel for a base connection.20 7.4.8 Remote teardown of an outgoing channel for a base connection21 7.4.9 Remote teardown of an incoming dynamic channel .21 7.4.10 Remote teardown of an outgoing dynamic channel21 7
12、.4.11 Removal of a base channel because of re-configuration.21 8 Messages 21 8.1 General message format .21 8.2 IPOD_Register .22 8.2.1 Normal message format 22 8.2.1.1 Source IP Address.22 8.2.1.2 Base Connection .22 8.2.1.3 Configured 23 8.2.2 Flow Restriction Extension.23 8.2.2.1 Extension type.2
13、3 ETSI ETSI TR 101 803-10 V1.1.1 (2004-07) 4 8.2.2.2 Extension length23 8.2.2.3 Source IP address 23 8.2.2.4 Destination IP address.23 8.2.2.5 Protocol.24 8.2.2.6 Source port 24 8.2.2.7 Destination port number24 8.2.3 Priority restriction extension.24 8.2.4 Authentication extensions.24 9 IP encapsul
14、ation .24 Annex A: MIB parameters25 A.1 Configuration parameters.25 A.1.1 IPOD_IP_ADDRESS.25 A.1.2 IPOD_DSTI25 A.1.3 IPOD_BASECHANNEL_STARTBR_DEFAULT .25 A.1.4 IPOD_BASECHANNEL_MINBR_DEFAULT 25 A.1.5 IPOD_BASECHANNEL_MAXBR_DEFAULT.25 A.1.6 IPOD_BASECHANNELx.IP_ADDRESS 25 A.1.7 IPOD_BASECHANNELx.DTM_
15、ADDRESS.25 A.1.8 IPOD_BASECHANNELx.DSTI.25 A.1.9 IPOD_BASECHANNELx.STARTBR25 A.1.10 IPOD_BASECHANNELx.MINBR.25 A.1.11 IPOD_BASECHANNELx.MAXBR .26 A.1.12 IPOD_INTERVAL_MIN.26 A.1.13 IPOD_INTERVAL_MAX .26 A.1.14 IPOD_BASECHANNEL_NORETURN_TIMEOUT26 A.1.15 IPOD_BASECHANNEL_ACCEPT_UNCONFIGURED.26 History
16、 27 ETSI ETSI TR 101 803-10 V1.1.1 (2004-07) 5 Intellectual Property Rights IPRs essential or potentially essential to the present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be f
17、ound in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to
18、 the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Forew
19、ord This Technical Report (TR) has been produced by ETSI Technical Committee Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN). The present document is part 10 of a multi-part deliverable. Full details of the entire series can be found in part 1 5. Int
20、roduction Dynamic synchronous Transfer Mode (DTM) is a time division multiplex and a circuit-switched network technique that combines switching and transport. The recommendation specifying the DTM system and protocols are divided into 13 parts. This part (Part 10) describes the method by which IP (a
21、s defined within IETF) traffic is carried over DTM. The topics of the other parts are as follows: Part 1 introduces DTM and describes the service over a unidirectional data channel. Part 2 includes system aspects that are mandatory or optional for nodes from different vendors to interoperate. These
22、system aspects are addressing, routing, synchronization and channel management. The interworking granularity should be at node level, such that nodes from different vendors can interoperate with regard to well-defined functions. Part 3 specifies the physical layer protocol for 8b/10b encoding based
23、physical links. Part 4 specifies the physical layer protocol for SDH VC4 container based physical links. The transport of various tributary signals is specified for PDH (Part 5), SDH (Part 6), Ethernet (Part 7), Frame Relay (Part 8), ATM (Part 9), IP (Part 10), Mapping of MPLS over DTM (Part 11), an
24、d video streaming (Part 12). Note that DTM can either run over SDH or carry it as a tributary. Finally, management aspects are standardized in Part 13. ETSI ETSI TR 101 803-10 V1.1.1 (2004-07) 6 1 Scope The present document is a technical report keeping the state of the early development done on the
25、 transport of IP over DTM. It gives insight into how things can be done, but is not complete enough to become a standard, so the status is reported so that further work can make use of this knowledge. The present document describes how IP traffic can be carried over a DTM network. Specifically, the
26、mapping between IP and DTM is described and the system environment in which it operates. It further describes two services to carry IP traffic over a DTM, topology based forwarding and flow based forwarding. The first service is based on hop-by-hop IP forwarding where the DTM transport is used as a
27、flexible transport technology. The connectivity between the IP/DTM interworking functions is established (where IP routing functions are connected to DTM networks) by network management. This achieves an IP network overlaid on the DTM infrastructure. The IP overlay network is semi permanent as is us
28、ually the case for transport networks. For this service, the present document covers the adaptation of the IP traffic on to the connections and mechanisms for establishing the connections. User IP traffic will then be routed over the overlay IP network by the IP routers. In the second service, the I
29、P/DTM interworking function sets up a specific connection to other IP/DTM interworking functions “on-demand“ across a DTM network to provide a dedicated connection for streaming IP traffic across the DTM network. These are referred to as dynamic channels. This service provides the capability to ensu
30、re, for example, traffic isolation, low latency and low packet loss for a specific IP flow. The standard describes the adaptation of IP traffic on to the channels, channel setup and connection modification. The present document currently only defines the mechanisms for setting up channels with one s
31、ender and one receiver. 2 References For the purposes of this Technical Report (TR) the following references apply: 1 IETF RFC 791: “Internet Protocol“. 2 IETF RFC 2328: “OSPF Version 2“, J. Moy, April 1998. 3 IETF RFC 2460: “Internet Protocol, Version 6 (IPv6) Specification“. 4 IETF RFC 2543: “SIP
32、Session Initiation Protocol“. 5 ETSI ES 201 803-1: “Dynamic synchronous Transfer Mode (DTM); Part 1: System Description“. 6 ETSI ES 201 803-7: “Dynamic synchronous Transfer Mode (DTM); Part 7: Ethernet over DTM Mapping“. 7 IETF RFC 2205: “Resource ReSerVation Protocol (RSVP) - Version 1 Functional S
33、pecification“. 8 IETF RFC 261: “PPP over SONET/SDH“, A. Malis, W. Simpson. June 1999. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions apply: access node: a node that supports an external network interface, contains an inte
34、rworking function for an external network and uses the DTM service channel: set of slots allocated from one source Access node to one or more destination access nodes in a network NOTE: The source and destination nodes can be the same, where the channel is internal to the node. ETSI ETSI TR 101 803-
35、10 V1.1.1 (2004-07) 7 control channel: channel used for control signalling data channel: channel used for transport of user data domain: DTM network or part of a network that is managed by a particular commercial or administrative entity (carrier/operator) DTM network client: client of the DTM netwo
36、rk service, i.e. mapping functions DTM network: set of connected DTM nodes NOTE: A DTM network may be single-domain, or multi-domain. dynamic channel: channel set up between two access nodes for specific purposes NOTE: When used to transport IP traffic it is not visible to the IP routing protocols a
37、s being additional connectivity. node: network element that contains DTM functions node address: DTM network layer address of a node 3.2 Abbreviations For the purposes of the present document, the following abbreviations apply: ARP Address Resolution Protocol CMI Channel Multiplexing Indentifier CMM
38、I Channel Management Module Interface DCAP-1 DTM Channel Adaption Protocol 1 DCP DTM Channel Protocol DST DTM Service Type DSTI DTM Service Type Instance DTM Dynamic synchronous Transfer Mode IP Internet Protocol IPOD IP Over DTM LSA Link Signalling Activity PDU Protocol Data Unit RFC Request For Co
39、mment (IETF document) RSVP Resource ReSerVation ProtocolRIP Routing Information Protocol POS Packet Over Sonet (/SDH) VPN Virtual Private Network NHRP Next Hop Reservation Protocol 4 Service overview Two different methods for transporting IP traffic across a DTM network are specified in the present
40、document. The DTM network may be used to provide a transmission layer between adjacent IP routers which provide a service based on traditional hop-by-hop forwarding. This method is normally used for best effort IP traffic. In this case, the channels are set up by management actions and provide trans
41、mission links available to the IP routers and connectivity that is visible to the IP routing protocols. The IP router functionality may be included in the same equipment as the DTM Switch, but such IP functionality is not the subject of the present document. ETSI ETSI TR 101 803-10 V1.1.1 (2004-07)
42、8 Using the second method, the DTM network may provide unidirectional channels across the network between ingress and egress IP routers/hosts on demand. This mechanism provides dedicated channels (dynamic channels) across the DTM network and can be used for IP flows between IP/DTM interworking funct
43、ions (e.g. DTM aware IP routers). The IP flows could contain, for example, real-time traffic, Video, VPN or Database transfers. The DTM address and DSTI allocated to the IPOD interface and used by the DTM layer is provided to the IP layer across the IPOD interface such that the IP layer may resolve
44、the addresses using one of its protocols such as OSPF opaque LSA, NHRP, RSVP, etc. The most significant difference between IP and DTM is that IP is connectionless, while DTM is a connection-oriented technology. IP maintains no state information; every packet has complete address information identify
45、ing the destination and each packet transported is handled individually in the process of forwarding packets from sender to receiver. DTM, on the other hand, is connection-oriented; meaning that data is transported using an established connection. During the establishment of the connection sufficien
46、t state information is stored in the switches along the path from source to destination to forward the data without the need for each data item to carry information specifying the destination. As a result of the connection-oriented properties of DTM, channels need to be set up between IP/DTM Interwo
47、rking functions before transporting the IP traffic over the DTM network. 5 System overview IP over DTM (IPOD) is designed for building large IP- networks overlaid on DTM networks. IPOD is designed to efficiently provide a best-effort service for bursty traffic, as well as transport of QoS demanding
48、traffic. IPOD supports both types of traffic in the same infrastructure by treating them differently. Normally, best-effort traffic is handled with topology-based forwarding and traffic that requires a high QoS is handled with flow based forwarding. IPOD includes the following: A base set of channel
49、s to provide the connectivity for a hop-by-hop IP overlay network with the possibility to aggregate traffic as in normal router based IP networks. These channels are established at startup and are semi permanent. An efficient IP topology. IPOD utilizes the multi channel characteristics of DTM to have many adjacent routers meaning that there can be channels to many adjacent routers using the same physical DTM link. This means that many IP routers can be reached directly thus appearing to the IP network as adjacent which reduces the number of rout
