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[EFM] OAM event sequence number

Hi,

57.4.3.2 only says that OAM client compares the event sequence number with
the last received one and ignore the event when the sequence numbers are equal.
It does not specify what to do when it receives an event with a sequence number
less than the last received one.

The scenario that I'm thinking about:
A sends event 1, 2, 3, 4, 5 and 3 gets dropped. Later event 3 gets retransmitted and received
at the other end. What should the receiver do?

Comments?