Loopback (LBM), linktrace (LTR) and two-way-delay measurements (Y.1731 ETH-DMM) can be scheduled using SAA. Additional timestamping is required for non Y.1731 delay-measurement tests, to be specific, loopback and linktrace tests. An organization-specific TLV is used on both sender and receiver nodes to carry the timestamp information. Currently, timestamps are only applied by the sender node. This means any time measurements resulting from loopback and linktrace tests includes the packet processing time of the remote node. Because Y.1731 ETH-DMM uses a four time stamp approach to remove the remote processing time it should be used for accurate delay measurements.
The SAA versions of the CFM loopback, linktrace and ETH-DMM tests support send-count, interval, timeout, and FC. The existing CFM OAM commands have not been extended to support send-count and interval natively. The summary of the test results are stored in an accounting file that is specified in the SAA accounting-policy.