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1、IEEE Std 802.17a- 2004 (Amendment to IEEE Std 802.1D-2004) IEEE Standards 802.17a TM IEEE Standard for Local and metropolitan area networks Media Access Control (MAC) Bridges Amendment 1: Bridging of IEEE 802.17 3 Park Avenue, New York, NY 10016-5997, USA IEEE Computer Society Sponsored by the LAN/M
2、AN Standards Committee IEEE Standards 29 October 2004 Print: SH95268 PDF: SS95268 The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2004 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 29 Oc
3、tober 2004. Printed in the United States of America. IEEE and 802 are registered trademarks in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. NOTEAttention is call
4、ed to the possibility that implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the exist- ence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for
5、 identifying patents for which a license may be required by an IEEE standard or for conducting inquiries into the legal valid- ity or scope of those patents that are brought to its attention. Copyright 2004 IEEE. All rights reserved.iii Introduction (This introduction is not part of IEEE Std 802.17a
6、-2004, IEEE Standard for Local and Metropolitan Area Networks Media Access Control (MAC) BridgesAmendment 1: Bridging of IEEE 802.17.) This standard is part of a family of standards for local and metropolitan area networks. This family of standards deals with the physical and data link layers as def
7、ined by the International Organization for Standardization (ISO) Open Systems Interconnection (OSI) Basic Reference Model (ISO/IEC 7498-1:1994). The access standards define different types of medium access technologies and associated physical media, each appropriate for particular applications or sy
8、stem objectives. Notice to users Errata Errata, if any, for this and all other standards can be accessed at the following URL: http:/ standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL for errata periodically. Interpretations Current interpretations can
9、 be accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/ index.html. Patents Attention is called to the possibility that implementation of this standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with resp
10、ect to the existence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents or patent applications for which a license may be required to implement an IEEE standard or for conducting inquiries into the legal validity or scope of those pate
11、nts that are brought to its attention. ivCopyright 2004 IEEE. All rights reserved. Participants The following is a list of participants in the IEEE 802.17 Working Group. Michael Takefman, Chair John Lemon, Vice ChairVinnay Bannai, Secretary Thomas Alexander, Chief Editor Robert Castellano and Marc H
12、olness, Editors The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Samir Abzakh Michael Allen Khaled Amer Charles Barry Tim Barry Constantinos Bassias Prasenjit Biswas Rhett Brikovskis Leon Bruckman J
13、ason Fan Stein Gjessing Martin Green John Hawkins Asif Hazarika Russ Homer Chang Huang Wai-Chau Hui David James Peter Jones Jim Kao Michael Kelsen Philip Kruzinski Paritosh Kulkarni Kshitij Kumar Robert D. Love Derek Mayweather Li Mo Gal Mor Vahid Naraghi Glenn Parsons Chip Paryzek Harry Peng Tim Pl
14、unkett Paul Quesenberry K. K. Ramakrishnan Gady Rosenfeld Raj Sharma Atul Shinde Donald Sorenson Bob Sultan George Suwala Necdet Uzun Link Verstegen Steven Wood Donghui Xie Mete Yilmaz Pinar Yilmaz George Young David Zelig Daniel Zhu Thomas Alexander Butch Anton John Barnett Hugh Barrass Leon Bruckm
15、an Edward Carley, Jr. Robert Castellano Dean Chang Keith Chow Todor Cookley Guru Dutt Dhingra Wael Diab Sourav Dutta Clint Early, Jr. Jason Fan Matthew Fischer Will Foulds Ernesto Garcia Stuart Holoman Changcheng Huang David Hunter Atsushi Ito Peeya Iwagoshi Raj Jain David James Tony Jeffree Peter J
16、ones Junghong Kao Piotr Karocki Cees Klik John Lemon Jan-Ray Liao Randolph Little William Lumpkins Ariel Maislos George Miao David Mitton Jeremy Newberry Nick S. A. Nikjoo Satoshi Obara Chris Osterloh Stephen Palm Glenn Parsons Vikram Punj Paul Quesenberry John Roese Gady Rosenfeld Floyd Ross Gil Sh
17、ultz Matt Squire Robert Sultan Michael Takefman Joseph Tardo Geoffrey Thompson Mark-Rene Uchida Necdet Uzun Derek Woo Steven Wood Mete Yilmaz George Young Oren Yuen Copyright 2004 IEEE. All rights reserved.v When the IEEE-SA Standards Board approved this standard on 23 September 2004, it had the fol
18、lowing membership: Don Wright, Chair Steve M. Mills, Vice Chair Judith Gorman, Secretary *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish K. Aggarwal, NRC Representative Richard DeBlasio, DOE Representative Alan Cookson, NIST Representative Don Mess
19、ina IEEE Standards Project Editor Chuck Adams H. Stephen Berger Mark D. Bowman Joseph A. Bruder Bob Davis Roberto de Boisson Julian Forster* Arnold M. Greenspan Mark S. Halpin Raymond Hapeman Richard J. Holleman Richard H. Hulett Lowell G. Johnson Joseph L. Koepfinger* Hermann Koch Thomas J. McGean
20、Daleep C. Mohla Paul Nikolich T. W. Olsen Ronald C. Petersen Gary S. Robinson Frank Stone Malcolm V. Thaden Doug Topping Joe D. Watson viCopyright 2004 IEEE. All rights reserved. Contents 6.5.5Support by IEEE Std 802.17 (RPR). 2 7.7.5Priority mapping 4 Copyright 2004 IEEE. All rights reserved.1 IEEE
21、 Standard for Local and Metropolitan Area Networks: Media Access Control (MAC) Bridges Amendment 1: Bridging of IEEE 802.17TM EDITORS NOTEThe editing instructions contained in this amendment define how to merge the material contained herein into the existing base standard and its amendments to form
22、the comprehensive standard. The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace. Change is used to make small corrections in existing text or tables. The editing instruction specifies the location of the change and describes what
23、 is being changed either by using strikethrough (to remove old material) or underscore (to add new material). Delete removes existing material. Insert adds new material without disturbing the existing material. Insertions may require renumbering. If so, renumbering instructions are given in the edit
24、ing instructions. Replace is used to make large changes in existing text, subclauses, tables, or figures by removing existing material and replacing it with new material. Editorial notes will not be carried over into future editions. IEEE Std 802.17a-2004IEEE STANDARD FOR LOCAL AND METROPOLITAN AREA
25、 NETWORKS 2Copyright 2004 IEEE. All rights reserved. Insert 6.5.5 after 6.5.4, and insert the following material into 6.5.5. 6.5.5 Support by IEEE Std 802.17TM-2004 (RPR)1 The RPR MAC access method is specified in IEEE Std 802.17. Clause 6 of that standard specifies the MAC service interface and ref
26、erence model. Clause 7 specifies the MAC transmission and reception procedures. Clause 9 specifies the MAC frame structure. On receipt of a M_UNITDATA.request primitive, the local MAC entity performs transmit data encapsula- tion, which assembles a MAC frame (IEEE Std 802.17, Clause 9) with the para
27、meters supplied as specified in the paragraphs that follow. On receipt of a valid MAC frame (IEEE Std 802.17, Clause 9), a M_UNITDATA.indication primitive is generated, with parameter values derived from the frame fields as specified in the paragraphs that follow. The frame_type parameter takes only
28、 the value user_data_frame and is encoded in the frame type (ft) field of the baseControl field (IEEE Std 802.17, 9.6.3). The mac_action parameter takes only the value request_with_no_response and is not explicitly encoded in MAC frames. The destination_address parameter is encoded in the da field o
29、f the MAC frame (IEEE Std 802.17, 9.2.2.3). For frames transmitted by a MAC client (e.g., bridge relay entity) where the source_address param- eter does not equal the MACs address, the destination_address parameter is encoded in both the da and the daExtended fields of the MAC frame (IEEE Std 802.17
30、, 9.2.2.8). The source_address parameter is encoded in the sa field of the MAC frame (IEEE Std 802.17, 9.2.2.4) when supplied by a MAC client, and when the source_address is equal to the MACs address. When the source_address is supplied by a MAC client (e.g., bridge relay entity), and when the sourc
31、e_address is not equal to the MACs address, then the source_address is encoded in the saExtended field of the MAC frame (IEEE Std 802.17, 9.2.2.9). The mac_service_data_unit parameter is the service user data that includes the protocol type and is encoded in the protocolType and serviceDataUnit fiel
32、ds of the MAC frame (IEEE Std 802.17, 9.2.2.10, 9.2.2.11). Whenever the access_priority parameter is not provided, the user_priority parameter provided in the data request primitive is encoded into the service class (sc) subfield of the baseControl field (IEEE Std 802.17, 9.6.4) of the MAC frame. Th
33、is encoding is done in accordance with the user_priority to access_priority mapping of Table 7-4, plus the access_priority to MAC service class mapping of Table 6-2. Table 7-4 is first used to convert the user_priority to an access_priority, and Table 6-2 is then applied to convert the access_priori
34、ty to an actual MAC service class. In the case of the indication primitive, the user_priority parameter is directly derived from the sc subfield of the baseControl field of the MAC frame. The mapping between the service class and the user_priority parameter of the indication primitive is provided in
35、 Table 6-1. 1IEEE publications are available from the Institute of Electrical and Electronics Engineers, 445 Hoes Lane, P.O. Box 1331, Piscataway, NJ 08855-1331, USA (http:/standards.ieee.org/). IEEE MAC BRIDGESAMENDMENT 1: BRIDGING OF IEEE 802.17Std 802.17a-2004 Copyright 2004 IEEE. All rights rese
36、rved.3 The access_priority parameter found in the data request primitive is encoded in the sc field of the MAC frame (IEEE Std 802.17, 9.6.4). The association between access_priority and the service class is illustrated in Table 6-2. If the access_priority parameter is supplied by the client, the ac
37、cess_priority to service class mapping takes precedence over the mapping of user_priority to service class. The frame_check_sequence parameter found in the data request primitive is encoded in the fcs field of the MAC frame (IEEE Std 802.17, 9.2.2.12). The fcs is calculated as a 32-bit CRC starting
38、from the first byte following the header checksum field (hec) (IEEE Std 802.17, 9.2.2.7) to the end of the payload (IEEE Std 802.17, 9.2.2.11) in accordance with IEEE Std 802.17, E.2. If a M_UNITDATA.request primi- tive is not accompanied by this parameter, it is calculated in accordance with IEEE S
39、td 802.17, E.2. No special action, above that specified in IEEE Std 802.17, is required for the support of the MAC Internal Sublayer Service by the RPR access method. The 802.17 MAC service interface supports a number of optional parameters that are specific to the 802.17 MAC. These parameters take
40、on default values in M_UNITDATA.request primitive during transmission, and they are ignored by the bridge relay on reception. The default values and procedures for handling RPR specific parameters are defined in 6.4.1, Clause 7, and F.3.1 of IEEE Std 802.17. Table 6-1MAC service class to user priori
41、ty indication mapping MAC service classuser_priority classC0 classB4 classA6 Table 6-2Access priority to MAC service class mapping access_priorityMAC service class 0classC 1classC 2classC 3classC 4classB 5classB 6classA 7classA IEEE Std 802.17a-2004 4Copyright 2004 IEEE. All rights reserved. 7.7.5 P
42、riority mapping Insert the following column with heading entitled “IEEE 802.17” to the right of column entitled “FDDI” in Table 7-4. Table 7-4Outbound access priorities user_priority Outbound Access Priority per MAC type IEEE 802.17 00 11 22 33 44 55 66 77 IEEE Std 802.1D- 2004 (Revision of IEEE Std
43、 802.1D-1998) IEEE Standards 802.1D TM IEEE Standard for Local and metropolitan area networks Media Access Control (MAC) Bridges 3 Park Avenue, New York, NY 10016-5997, USA IEEE Computer Society Sponsored by the LAN/MAN Standards Committee IEEE Standards 9 June 2004 Print: SH95213 PDF: SS95213 Recog
44、nized as an American National Standard (ANSI) The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2004 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 9 June 2004. Printed in the United States
45、 of America. IEEE is a registered trademark in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtained through the Copyright Clearance Center. NOTEAttention is called to the possibility that implementation of thi
46、s standard may require use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the exist- ence or validity of any patent rights in connection therewith. The IEEE shall not be responsible for identifying patents for which a license may be
47、required by an IEEE standard or for conducting inquiries into the legal valid- ity or scope of those patents that are brought to its attention. Copyright 2004 IEEE. All rights reserved. iii Introduction The MAC Bridge standardization activities that resulted in the development of IEEE Std 802.1D-199
48、0 (subsequently republished as IEEE Std 802.1D, 1993 Edition ISO/IEC 10038:1993 and IEEE Std 802.1D, 1998 Edition ISO/IEC 15802-3: 1998) specifi ed an architecture and protocol for the interconnection of IEEE 802 LANs below the MAC Service boundary. The 2004 revision of this standard incorporates tw
49、o amendments into the 1998 Edition: a)IEEE Std 802.1t-2001, technical and editorial corrections to the 1998 Edition; and b) IEEE Std 802.1w-2001, Rapid Reconfi guration, which specifi ed the Rapid Spanning Tree Algorithm and Protocol (RSTP). In addition, this revision includes further technical and editorial corrections, and removes the original Spanning Tree Protocol (STP) as a conformance option. Relationship between IEEE Std 802.1D and IEEE Std 802.1Q Another IEEE standard, IEEE Std 802.1Q -2003, extends the concepts of MAC Bridging and fi lte
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