M2PA: Abnormal BSN received in any two BSNs within three consecutive packets

Hi,

I have a query related to the behaviour of M2PA stack, when abnormal BSN is
received in any two BSNs within three consecutive packets.

M2PA draft draft-ietf-sigtran-m2pa-06.txt had mentioned about the behavior
of 'Abnormal BSN
handling' explicitly (refer to section 4.2.1). But, it has been removed from
latest RFC 4165
section 4.2.1.

What should be the correct behavior of M2PA stack when it receives two
incorrect BSNs in
three consecutive data_ack/data+data_ack ?
Will it silently drop the packet and does not send data indication to user
application (in
case of data with a piggybacked data_ack)? The link remains IN_SERVICE if
this solution
is taken.

Or, will it make the link Out of Service as mentioned in
draft-ietf-sigtran-m2pa-06.txt after
receiving two abnormal BSNs in three consecutive packets?

Thanks for giving your valuable time to read this query.

Regards,
Debasri Sarkar

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