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802.1ag - Connectivity Fault Management Tutorial Part 1

802.1ag PAR Overview. 802.1ag Scope. ?This standard specifies protocols, procedures, and managed objects to support transport fault management. These allow discovery and verification of the path, through bridges and LANs, taken for frames addressed to and from specified network users, detection, and

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802.1ag - Connectivity Fault Management Tutorial Part 1

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    1. 802.1ag - Connectivity Fault Management Tutorial – Part 1 Dinesh Mohan July 12, 2004

    3. 802.1ag Scope “This standard specifies protocols, procedures, and managed objects to support transport fault management. These allow discovery and verification of the path, through bridges and LANs, taken for frames addressed to and from specified network users, detection, and isolation of a connectivity fault to a specific bridge or LAN”

    4. 802.1ag Purpose “Bridges are increasingly used in networks operated by multiple independent organizations, each with restricted management access to each other’s equipment. This standard will provide capabilities for detecting, verifying and isolating connectivity failures in such networks”

    5. 802.1ag Reason for Standardization Growing interest in the use of Fault Management tools within enterprise and provider networks Such tool needed for established operational practices Existence of similar tools e.g. ATM’s “continuity check”, “Loopback” and “multiple Loopback” and IP’s “ping” and “traceroute” Interest and activities within ITU-T and MEF have further highlighted the need for these fault management tool

    7. Ethernet OAM Layering

    8. OAM Domain – Service/Network

    9. Maintenance Entity Points (MEP) & Maintenance Intermediate Points (MIP)

    10. Ethernet MEPs & MIPs

    11. Maintenance Entities Mapped

    12. End-to-end OAM – 2 Models

    13. Maintenance Entities – P2P Case

    14. Maintenance Entities – MP2MP Case

    15. Maintenance Entities – CPE based Network Demarcation Access

    16. Maintenance Entities – CPE based Network Demarcation Access

    19. CFM Functionality a) CC – Continuity Check Multicast unidirectional heartbeat Use: Fault Detection b) Loopback Unicast bi-directional request/response Use: Fault detection, verification c) Traceroute Multicast request/unicast responses Use: Fault Isolation

    20. Other OAM Functionality (out of scope for .1ag) d) Discovery i) Service e.g. discover all PEs supporting common service instance ii) Network e.g. discover all devices (PE and P) common to a domain e) AIS/RDI Use: E<->W Fault propagation, Alarm Suppression f) Performance Management

    21. CFM Functions mapped to MEs

    22. Summary Ethernet moving into Provider Networks Providers require fault management tools to manage their networks High Industry interest in Ethernet connectivity fault management tools

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