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1、IEEE Std 802.1ag-2007 (Amendment to IEEE Std 802.1Q-2005 as amended by IEEE Std 802.1ad-2005 and IEEE Std 802.1ak-2007) IEEE Standard for Local and metropolitan area networks Virtual Bridged Local Area Networks Amendment 5: Connectivity Fault Management IEEE 3 Park Avenue New York, NY 10016-5997, US
2、A 17 December 2007 IEEE Computer Society Sponsored by the LAN/MAN Standards Committee 802.1ag TM Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo r
3、eproduction or networking permitted without license from IHS -,-,- Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo reproduction or networking perm
4、itted without license from IHS -,-,- IEEE Std 802.1ag -2007 (Amendment to IEEE Std 802.1Q -2005 as amended by IEEE Std 802.1ad -2005 and IEEE Std 802.1ak -2007) IEEE Standard for Local and metropolitan area networks Virtual Bridged Local Area Networks Amendment 5: Connectivity Fault Management Spons
5、or LAN/MAN Standards Committee of the IEEE Computer Society Approved 27 September 2007 IEEE SA-Standards Board Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02
6、:10:36 MDTNo reproduction or networking permitted without license from IHS -,-,- The Institute of Electrical and Electronics Engineers, Inc. 3 Park Avenue, New York, NY 10016-5997, USA Copyright 2007 by the Institute of Electrical and Electronics Engineers, Inc. All rights reserved. Published 17 Dec
7、ember 2007. 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. Copyright The Institu
8、te of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo reproduction or networking permitted without license from IHS -,-,- ivCopyright 2007 IEEE. All rights reserved. Introdu
9、ction The MAC Bridge standardization activities that resulted in the development of IEEE Std 802.1D introduced the concept of Filtering Services in Bridged Local Area Networks, mechanisms whereby filtering information in such LANs can be acquired and held in a Filtering Database, as well as support
10、for expedited data, dynamic filtering of Group MAC addresses through the GMRP protocol, and the GARP protocol that supports GMRP and can support other applications. IEEE Std 802.1Q-2005, a revision of IEEE Std 802.1Q-1998, defines mechanisms that allow the implementation of Virtual Bridged Local Are
11、a Networks, including: a)Virtual LAN Services; b)The operation of the Forwarding Process that is required; c)The structure of the Filtering Database that is required; d)The nature of the protocols and procedures that are required in order to provide Virtual LAN services, including the definition of
12、the frame formats used to represent VLAN identification information, and the procedures used in order to insert and remove VLAN identifiers and the headers in which they are carried; e)The ability to support end-to-end signaling of priority information regardless of the intrinsic ability of the unde
13、rlying MAC protocols to signal priority information; f)The GARP VLAN Registration Protocol (GVRP) that allows distribution and registration of VLAN membership information (the protocol described makes use of the GARP protocol defined in IEEE Std 802.1D); g)The management services and operations that
14、 are required in order to configure and administer networks; h)The ability to restrict Dynamic Group and VLAN registration based on the contents of static filtering entries; i)VLAN classification according to link layer protocol type; j)Support for VLANs carried over multiple Spanning Tree instances
15、. IEEE Std 802.1ad-2005, an amendment to IEEE Std 802.1Q-2005, defines mechanisms that allow the implementation of Provider Bridged Networks, including: k)The differentiation between Service VLANs (S-VLANs), identified by a new S-VLAN tag, and customer VLANs (C-VLANs), identified by the IEEE 802.1Q
16、tag; l)The encapsulation of C-VLAN tags within S-VLAN tags, in order to allow a service provider to carry some or all of a customers C-VLANs within a single S-VLAN; m)The provision of two levels of drop precedence separate from the priority levels of IEEE Std 802.1D, and the replacement of the Canon
17、ical Format Indicator of the C-VLAN tag by a Drop Eligible Indicator in the S-VLAN tag to carry the drop precedence; n)The passing of certain of the customers control PDUs, including IEEE 802.1AB LLDP PDUs and IEEE 802.1Q Bridge PDUs, transparently through the Provider Bridged Network as ordinary da
18、ta; o)The reassignment of MAC addresses used for control PDUs, including BPDUs, for use by Provider Bridges; p)The definition of C-VLAN components, added to Provider Bridge Ports to provide the functions necessary to support the allocation of C-VLANs to S-VLANs, to map priorities between networks, a
19、nd to interact with the customers control protocols; and q)The managed objects necessary to control these functions. This standard provides Connectivity Fault Management (CFM) capabilities useful to Virtual Bridged Local Area Networks for detecting, isolating, and reporting connectivity faults. It i
20、s aimed primarily at Provider This introduction is not part of IEEE Std 802.1ag-2007, IEEE Standard for Local and Metropolitan Area Networks Virtual Bridged Local Area NetworksAmendment 5: Connectivity Fault Management. Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided b
21、y IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2007 IEEE. All rights reserved.v Bridged Networks, but is useful also for C-VLAN networks. The mecha
22、nisms defined in this standard include: r)The ability to configure multiple nested Maintenance Domains over a Bridged Network or a network of Bridged Networks, each potentially managed by a different administrative organization; s)The ability to configure Maintenance Associations (MAs), each identif
23、ied with a single Maintenance Domain, and on any given Bridge, a set of VLANs; t)The protocols, procedures, and CFM Protocol Data Unit (CFM PDU) formats required to detect, isolate, and report connectivity faults; u)The ability, within an MA, to configure and manage Maintenance Points (MPs) that gen
24、erate and respond to CFM PDUs; and v)The ability to command MPs to perform certain fault isolation operations, and to inspect the results. CFM is not to be confused with the Ethernet OAM capabilities described in IEEE Std 802.3 , Clause 57. IEEE 802.3 OAM is concerned with detecting and reporting fa
25、ults on a single point-to-point IEEE 802.3 LAN. IEEE Std 802.1ag-2007 is concerned with detecting, isolating, and reporting connectivity faults spanning networks comprising multiple LANs, including LANs other than IEEE 802.3 media. This standard contains state-of-the-art material. The area covered b
26、y this standard is undergoing evolution. Revisions are anticipated within the next few years to clarify existing material, to correct possible errors, and to incorporate new related material. Information on the current revision state of this and other IEEE 802 standards can be obtained from Secretar
27、y, IEEE-SA Standards Board 445 Hoes Lane P.O. Box 1331 Piscataway, NJ 08855-1331 USA 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
28、for errata periodically. Interpretations Current interpretations can 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 rig
29、hts. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in connection therewith. A patent holder or patent applicant has filed a statement of assurance that it will grant licenses under these rights without compensation or under reaso
30、nable rates, with reasonable terms and conditions that are demonstrably free of any unfair discrimination to applicants desiring to obtain such licenses. Other Essential Patent Claims may exist for which a statement of assurance has not been received. The IEEE is not responsible for identifying Esse
31、ntial Patent Claims for which a Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo reproduction or networking permitted without license from IHS -,-,
32、- viCopyright 2007 IEEE. All rights reserved. license may be required, for conducting inquiries into the legal validity or scope of Patents Claims, or determining whether any licensing terms or conditions are reasonable or non-discriminatory. Further information may be obtained from the IEEE Standar
33、ds Association. Participants At the time this standard was submitted to the IEEE-SA Standards Board for approval, the following were participants in the IEEE 802.1 Working Group: Anthony A. Jeffree, Chair Paul Congdon, Vice Chair Stephen R. Haddock, Interworking Task Group Chair Norman W. Finn, Edit
34、or-in-Chief David V. Elie-Dit-Cosaque, Dinesh Mohan, Oscar Rodriguez, Ali Sajassi, Assistant Editors The following members of the individual balloting committee voted on this standard. Balloters may have voted for approval, disapproval, or abstention. Alexei Beliaev Jean-Michel Bonnamy Mike Borza Pa
35、ul Bottorff Rudolf Brandner Jim Burns Dirceu Cavendish Frank Chao Uri Cummings Russell Dietz Linda Dunbar Hesham Elbakoury Donald W. Fedyk Felix Feifei Feng David Frattura John Fuller Geoffrey Garner Anoop Ghanwani Ken Grewal Romain Insler Ran Ish-Shalom Vipin Jain Hal Keen Yongbum Kim Mike Ko Bruce
36、 Kwan Kari Laihonen Yannick Le Goff David Martin John Messenger Hiroshi Ohta Don Pannell Glenn Parsons Ken Patton Haim Porat Ray Qiu Karen Randall Robert Roden Josef Roese Allyn Romanow Dan Romascanu Jessy V. Rouyer Eric Ryu Panagiotis Saltsidis Sam Sambasivan John M. Sauer Michael J. Seaman Koichir
37、o Seto Curtis Simonson Nurit Sprecher Kevin B. Stanton Robert Sultan Muneyoshi Suzuki Francois Tallet Michael Johas Teener John Terry Patricia A. Thaler Dennis Volpano Manoj Wadekar Bert Wijnen Ludwig Winkel Michael D. Wright Toru Aihara Thomas Alexander Butch Anton Hugh Barrass Tomo Bogataj Matthew
38、 Burnburg Edward J. Carley James T. Carlo Juan C. Carreon Keith Chow Bryan P. Cook Tommy P. Cooper Wael W. Diab Russell S. Dietz Thomas J. Dineen Sourav K. Dutta David V. Elie-Dit-Cosaque Donald W. Fedyk Norman W. Finn C. J. Fitzgerald Yukihiro Fujimoto Devon L. Gayle Michael D. Geipel Randall C. Gr
39、oves C. G. Guy Stephen R. Haddock John F. Hawkins David Hunter Atsushi Ito Raj Jain Anthony A. Jeffree Michael D. Johas Teener Peter G. Jones Bobby Jose Shinkyo Kaku Junghong Kao Piotr Karocki Stuart J. Kerry Lior Khermosh Yongbum Kim Cees Klik Thomas M. Kurihara Copyright The Institute of Electrica
40、l and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright 2007 IEEE. All rights reserved.vii When the IEEE-SA Stan
41、dards Board approved this standard on 27 September 2007, it had the following membership: Steve M. Mills, Chair Robert M. Grow, Vice Chair Don Wright, Past Chair Judith Gorman, Secretary *Member Emeritus Also included are the following nonvoting IEEE-SA Standards Board liaisons: Satish K. Aggarwal,
42、NRC Representative Alan H. Cookson, NIST Representative Michelle D. Turner IEEE Standards Program Manager, Document Development Michael D. Kipness IEEE Standards Program Manager, Technical Program Development Jeremy Landt Juan L. Lazaro John Lemon G. Luri Arthur Marris Marco Mascitto Jonathon C. Mcl
43、endon Richard I. Mellitz Gary L. Michel Dinesh Mohan Jose Morales Michael S. Newman Paul Nikolich Satoshi Obara Robert OHara Stephen R. Palm Vikram Punj Jose Puthenkulam Maximilian Riegel Robert A. Robinson Fernando Lucas Rodriguez Jessy V. Rouyer John M. Sauer Bartien Sayogo Thomas Schossig Michael
44、 J. Seaman Amjad A. Soomro Matthew B. Squire Manikantan Srinivasan Thomas E. Starai Walter Struppler Alourdes T. Sully Robert Sultan Joseph J. Tardo Patricia A. Thaler Mark-Rene Uchida Stanley S. Wang Stephen C. Webb Oren Yuen Janusz Zalewski Richard DeBlasio Alex Gelman William R. Goldbach Arnold M
45、. Greenspan Joanna N. Guenin Julian Forster* Kenneth S. Hanus William B. Hopf Richard H. Hulett Hermann Koch Joseph L. Koepfinger* John Kulick David J. Law Glenn Parsons Ronald C. Petersen Tom A. Prevost Narayanan Ramachandran Greg Ratta Robby Robson Anne-Marie Sahazizia Virginia C. Sulzberger Malco
46、lm V. Thaden Richard L. Townsend Howard L. Wolfman Copyright The Institute of Electrical and Electronics Engineers, Inc. Provided by IHS under license with IEEELicensee=IHS Employees/1111111001, User=Japan, IHS Not for Resale, 07/30/2008 02:10:36 MDTNo reproduction or networking permitted without li
47、cense from IHS -,-,- viiiCopyright 2007 IEEE. All rights reserved. Figures Figure 6-1MAC entities, the MAC Service, and MAC Service users (clients). 14 Figure 6-2An interface stack 15 Figure 6-3Two back-to-back EISS Multiplex Entities 18 Figure 12-1Relationships among CFM managed objects 24 Figure 1
48、8-1One Maintenance Domain: operators view . 119 Figure 18-2One service instance: operators view. 120 Figure 18-3One service instance: customers view. 120 Figure 18-4MEP and MIP Symbols. 121 Figure 18-5Maintenance Associations: one service instance in a provider network. 122 Figure 18-6Maintenance Associations: Expansion of Figure 18-5 123 Figure 18-7MEPs, MIPs, and MD Levels . 124 Figure 19-1CFM Protocol shims . 125 Figure 19-2Maintenance association End Point (MEP). 128 Figure 19-