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Why ?
PWs, especially TDM PWs need full-featured OAM
connectivity verification
fault reporting
loopback control
packet loss monitoring
delay and PDV monitoring
Many different OAM systems in use
Most recent development is Y.1731 (802.1ag)
State-of-the-art full-featured packet OAM
Exploits experience of all previous OAM protocols
Rapidly becoming gold standard for comparison
PPT Version