ETSI ES 201 803-7 V1.1.1 (2002-05)

Dynamic synchronous Transfer Mode (DTM); Part 7: Ethernet over DTM Mapping

DES/SPAN-130007

Dinamični sinhroni prenosni način (DTM) – 7. del: Preslikava Etherneta preko preslikave načina DTM

General Information

• Status: Published
• Publication Date: 05-May-2002
• Technical Committee: SPAN 13 - SPAN Peer-to-Peer Control Protocol (PTPCP)
• Current Stage: 12 - Completion
• Due Date: 10-May-2002
• Completion Date: 06-May-2002
• Ref Project: SIST ES 201 803-7 V1.1.1:2005 - Dynamic synchronous Transfer Mode (DTM); Part 7: Ethernet over DTM Mapping

Standards Content (Sample)

SLOVENSKI STANDARD
SIST ES 201 803-7 V1.1.1:2005
01-januar-2005
'LQDPLþQLVLQKURQLSUHQRVQLQDþLQ'70±GHO3UHVOLNDYD(WKHUQHWDSUHNR
SUHVOLNDYHQDþLQD'70
Dynamic synchronous Transfer Mode (DTM); Part 7: Ethernet over DTM Mapping
Ta slovenski standard je istoveten z: ES 201 803-7 Version 1.1.1
ICS:
33.040.40 Podatkovna komunikacijska Data communication
omrežja networks
SIST ES 201 803-7 V1.1.1:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST ES 201 803-7 V1.1.1:2005

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SIST ES 201 803-7 V1.1.1:2005
ETSI ES 201 803-7 V1.1.1 (2002-05)
ETSI Standard
Dynamic synchronous Transfer Mode (DTM);
Part 7: Ethernet over DTM Mapping

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SIST ES 201 803-7 V1.1.1:2005
2 ETSI ES 201 803-7 V1.1.1 (2002-05)
Reference
DES/SPAN-130007
Keywords
DTM, Ethernet, LAN, transmission
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ETSI

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SIST ES 201 803-7 V1.1.1:2005
3 ETSI ES 201 803-7 V1.1.1 (2002-05)
Contents
Intellectual Property Rights.5
Foreword.5
Introduction .6
1 Scope .7
2 References .7
3 Definitions and abbreviations.7
3.1 Definitions.7
3.2 Abbreviations .8
4 Service overview.8
4.1 DLT service overview.9
4.2 DLE service overview.10
5 System overview .10
5.1 DLT system overview .10
5.1.1 Channels in DLT.11
5.1.2 DLT client traffic forwarding .11
5.2 DLE system overview .11
5.2.1 Channels in DLE.12
5.2.2 Packet forwarding in the DLE Client.12
5.2.3 Address learning in the DLE Client.12
5.2.4 Redundant DLE Servers .13
5.3 VLAN Support .13
6 Service Interfaces .14
6.1 Transport view.14
6.2 Control view.15
7 Detailed Protocol Description .16
7.1 DCMI interaction of DLE and DLT.16
7.2 DCAI interaction of DLE and DLT.17
7.3 DLT operation.17
7.3.1 Startup.18
7.3.2 Normal operation.18
7.3.3 Shutdown .18
7.3.4 Restart.18
7.3.5 Peer disconnect .18
7.3.6 Unknown Message Types and extensions .19
7.4 DLE operation.19
7.4.1 Server startup .19
7.4.2 Server shutdown .19
7.4.3 Server restart.20
7.4.4 New server connected to the DLE segment .20
7.4.5 Server disconnection.20
7.4.5.1 Removal of server to server channel .20
7.4.5.2 Server removal of channel between server and client .20
7.4.6 Client start up.21
7.4.7 Client restart.21
7.4.8 Client disconnect .22
7.4.9 Address resolution .22
7.4.9.1 Forwarding Ethernet frames with unknown destination .23
7.4.9.2 Fast address announce.23
7.4.10 Flush mechanism .23
7.4.11 Normal server operation .25
7.4.12 SCC Filtering .25
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7.4.13 Unknown message types.25
8 Messages .26
8.1 General Message Format.26
8.1.1 Representing Ethernet addresses.26
8.2 DLT messages .27
8.2.1 DLT_REGISTER .27
8.2.1.1 Message format .27
8.3 DLE messages .28
8.3.1 DLE_REGISTER .28
8.3.1.1 Message format .29
8.3.2 DLE_REGISTER_RESPONSE.29
8.3.2.1 Message format .29
8.3.3 DLE_AR_REQUEST .29
8.3.3.1 Message format .30
8.3.4 DLE_AR_ANNOUNCE.30
8.3.4.1 Message format .30
8.3.5 DLE_WAIT_FOR_FLUSH.31
8.3.5.1 Message format .31
8.3.6 DLE_FLUSH.31
8.3.6.1 Message format .32
8.3.7 DLE_AUTHENTICATE.32
8.3.8 DLE_SERVER_REGISTER .32
8.3.8.1 Message format .32
8.3.9 DLE_CLIENT_DISCONNECTED.33
8.3.9.1 Message format .33
9 Ethernet encapsulation .33
9.1 Ethernet packets with an 802.1Q tag.34
9.2 Ethernet packets without 802.1Q tag.35
9.3 Valid and invalid VLAN information .35
10 Appendices.36
10.1 Constants .36
10.2 Configuration Parameters DLT .37
10.2.1 DLT Client Configuration .37
10.3 Configuration parameters DLE .37
10.3.1 DLEC configuration .37
10.3.2 DLES configuration.40
Annex A (informative): Bibliography.41
History .42
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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 found
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 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 ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This ETSI Standard (ES) has been produced by ETSI Technical Committee Services and Protocols for Advanced
Networks (SPAN).
The present document is part 7 of a multi-part deliverable covering the Dynamic synchronous Transfer Mode (DTM),
as identified below:
Part 1: "System description";
Part 2: "System characteristics";
Part 3: "Physical Protocol";
Part 4: "Mapping of DTM frames into SDH containers";
Part 5: "Mapping of PDH over DTM";
Part 6: "Mapping of SDH over DTM";
Part 7: "Ethernet over DTM Mapping";
Part 8: "Mapping of Frame relay over DTM";
Part 9: "Mapping of ATM over DTM";
Part 10: "Routeing and switching of IP flows over DTM";
Part 11: "Mapping of video streams over DTM";
Part 12: "Mapping of MPLS over DTM";
Part 13: "System description of sub-rate DTM".
ETSI

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Introduction
Dynamic synchronous Transfer Mode (DTM) is a time division multiplex and a circuit-switched network technique that
combines switching and transport. The present document specifying the DTM system and protocols is divided into
13 parts.
The present document (part 7) describes the method by which Ethernet [1] packets are 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 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 physical links;
- Part 4 specifies the physical layer protocol for SDH/SONET 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), and 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.
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1 Scope
The present document specifies how Ethernet protocol is transported over DTM. The specification encapsulation of
PDUs includes address resolution (mapping the Ethernet source and destination address to the correct DTM
destination), DTM channel set-up, channel capacity modification, and Ethernet VLAN handling.
2 References
The following documents contain provisions which, through reference in this text, constitute provisions of the present
document.
• References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• For a non-specific reference, the latest version applies.
[1] IEEE 802.3 (1996): "IEEE Standard for Information technology; Telecommunications and
information exchange between systems; Local and metropolitan area networks; Specific
requirement; Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access
Method and Physical Layer Specifications".
[2] IEEE 802 (1990): "IEEE Standard for Local and Metropolitan Area Networks: Overview and
Architecture".
[3] IEEE 802.1D (1998): "IEEE Standard for Information technology; Telecommunications and
information exchange between systems; IEEE standard for local and metropolitan area networks;
Common specifications; Media access control (MAC) Bridges".
[4] IEEE 802.1Q (1998): "IEEE Standards for Local and Metropolitan Area Networks: Virtual
Bridged Local Area Networks".
3 Definitions and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
access node: node that supports an external network interface, contains an interworking 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.
control channel: channel used for channel signalling and management
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: set of connected DTM nodes
NOTE: A DTM network may be single-domain, or multi-domain.
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frame: set of slots forming an entity that is transmitted on a physical medium repeatedly every 125µs (nominally),
i.e. 8 000 frames/second
node: network element that contains DTM functions
node address: DTM network layer address of a node
slot: time slot within the frame being able to transport 64 bit of data or a number of special codes
switching: process of moving the data of a slot in both time and space, i.e. switching between different ports and
changing slot numbers while maintaining the bandwidth and avoiding slot reordering within each channel
switch node: node that contains a switching function
3.2 Abbreviations
For the purposes of the present document the following abbreviations apply:
ATM Asynchronous Transfer Mode
ARR Address Resolution Request
CCC Client-to-Client Channel
CMI Channel Multiplexing Identifier
CSC Client-to-Server Channel
DCAI DTM Channel Adaptation Interface
DCCI DTM Channel Control Interface
DCAP-1 DTM Channel Adaptation Protocol 1
DCMI DTM Channel Management Interface
DCP DTM Channel Protocol
DLE DTM LAN Emulation
DLEC DLE Client
DLES DLE Server
DLT DTM Ethernet LAN Transport
DST DTM Service Type
DSTI DTM Service Type Instance
DTM Dynamic synchronous Transfer Mode
IP Internet Protocol
MAC Medium Access Control
MIB Management Information Base
PDU Protocol Data Unit
RFC Request For Comment (IETF document)
SCC Server-to-Client Channel
SDH Synchronous Digital Hierarchy
SSC Server-to-Server Channel
TDM Time Division Multiplexing
VLAN Virtual Local Area Network
4 Service overview
There are two different ways of transporting Ethernet traffic across a DTM network specified in the present document:
• DTM LAN Transport (DLT) is a very simple service where the DTM network is used to set up a tunnel between
two DLT clients. Each DLT client is in its turn connected to a logical Ethernet switch. The logical Ethernet
switch forwards packets between the DLT client and one or several Ethernet ports and/or other DLT clients.
• DTM LAN Emulation (DLE) provides the additional service of a distributed Ethernet switch function, allowing
VLAN switching where two or more DLE Clients can be interconnected via the DTM network.
The characteristics of the Ethernet transport utilize the characteristics of the DTM transport service providing traffic
isolation and very low delay variation. The DTM network allows the distance limitation of connected Ethernets to be
removed.
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Ethernet is a connectionless technology, meaning that data is transported in packets that are handled independently of
each other. The packets carry sufficient information to identify the Ethernet destination of the packet. DTM, on the
other hand, is connection-oriented; meaning that data is transported using an established connection. During the
establishment of the connection sufficient state information is stored in the switches along the path from source to
destination. In order to forward the data, each data item does not need to carry information specifying the destination.
4.1 DLT service overview
This clause specifies how point-to-point Ethernet transport through a DTM network is done. The system consists of two
DLT clients that are connected via a DTM network. This forms a point-to-point Ethernet link between two logical
Ethernet nodes or switches. Each logical Ethernet switch connects several logical Ethernet interfaces to each other. A
logical Ethernet interface can be either a physical Ethernet interface or a DLT client.
Legend
Node X
Physical node with
DTM address X
Logical DLT
client
Physical Ethernet
port
Logical Ethernet
switch
Figure 1: A DLT tunnel between two DLT clients. Each DLT client is connected
to one logical Ethernet switch
During normal operation, the logical Ethernet switches forward packets between their Ethernet ports and DLT clients.
The logical Ethernet switch can either operate as a bridge or as a learning bridge, in which case it can only interconnect
two logical Ethernet interfaces, or as a hub or an Ethernet switch in which case it can interconnect two or more logical
Ethernet interfaces to each other.
A DLT client can belong to one or several VLANs. The DLT client should perform ingress filtering and discard all
packets with a VLAN tag outside of the set of VLANs that the client belongs to. The DLT client should also be
associated with a default VLAN. All packets that arrive to the DLT client on its incoming channel without VLAN
information (i.e. VLAN = 0) should be classified as belonging to the default VLAN. This is consistent with the way
ingress filtering works in the 802.1Q Ethernet standard [4].
The operation of the logical Ethernet switch is beyond the scope of the present document.
A DLT client can also be connected as an interface to a regular protocol stack, e.g. an IP routing process. The DLT
client should then behave as a normal Ethernet interface.
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4.2 DLE service overview
DTM LAN Emulation allows DTM to be used as a bridge between different segments of an Ethernet network. PDUs
are forwarded through the DTM network based on the destination address of the Ethernet frame. This allows forming
emulated LANs where a number of nodes can behave as if they were connected to the same Ethernet LAN. The
emulated LANs are independent of the DTM topology and are separated from each other by the DTM channelization.
DLE is completely transparent to all connected nodes and the nodes will not know if the node they are sending to or
receiving from is connected to the same Ethernet segment or if the Ethernet frames are sent via DTM. This makes it
possible to connect standard Ethernet equipment to the Ethernet segments.
Each DLE segment consists of one (or more, when using redundant DLE Servers) DLE Server (DLES) and several
DLE Clients (DLECs).
Y
DLE Client
X
Ethernet
B
C Ethernet
DLE Server
DLE Client
D
DLE Client
Figure 2: Example of a DLE network
In figure 2, B and C are DLE Clients in DTM to Ethernet Gateways. D is a DLE Client in a node with direct DTM
connectivity. X and Y are two Ethernet attached nodes. All the Ethernet nodes in the picture have connectivity on the
Ethernet level without passing through any router.
5Systemoverview
5.1 DLT system overview
The DTM LAN Transport (DLT) is a very simple protocol using a single protocol message (DLT_REGISTER) that the
clients use to register with each other and perform an optional authentication. When the clients have registered, they can
send Ethernet PDUs encapsulated in DCAP-1 between them.
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5.1.1 Channels in DLT
To connect two DLT clients to each other, one (or several) DTM channels are established in each direction. Each
channel should be established by the sender for that channel. The bit rate of the channel is configured at the source.
The Channel Multiplexing Identifier (CMI) in the D
...