M2PA: Link alignment when proving omitted

Hi,

This is regarding the Link alignment when proving is omitted. 
As per message flow given below, link is not able to come in-service
because M2PA-2 receives Link status Align after sending Link Status
Ready.

I would suggest M2PA-2 to resend Ready on receiving Align, while timer
T1 is running. This is as per following statement in RFC 4165, Section
4.1.3 Link Alignment -
"If the Link Status Ready message is sent, then M2PA MAY send additional
Link Status Ready messages while timer T1 is running."

Please let me know your feedback.


  MTP3-1      M2PA-1      SCTP-1      SCTP-2      M2PA-2      MTP3-2
  ----        ----        ----        ----        ----        ----
   .           .           .           .           .           .
   Start       .           .           .           .           .
   ------------>           .           .           .           .
   .           Associate   .           .           .           .
   .           ------------>           .           .           .
   .           .           .           .           .           .
   .           .           (SCTP Association       .           .
   .           .            procedure)             .           .
   .           .           .           .           .           .
   .           Communication Up        Communication Up        .
   .           <------------           ------------>           .
   .           .           .           .           .           .
   .           Link Status Out of Service          .           .
   .           ------------------------------------>           .
   .           .           .           .           .           .
   .           Link Status Alignment   .           .           .
   .           ------------------------------------>           .
   .           .           .           .           .           .
   .           Start timer T2          .           .           .
   .           .           .           .           .           .
   .           .          Link Status Out of Service           .
   .           <------------------------------------           .
   .           Link Status Alignment   .           .           .
   .           ------------------------------------>           .
   .           .          Link Status Out of Service           .
   .           <------------------------------------           .
   .           Link Status Alignment   .           .           .
   .           ------------------------------------>           .
   .           .       Link Status Out of Service(2)           .
   .           <------------------------------------           .
   .           .           .           .           .       Start
   .           .           .           .           <------------
   .           .           . Link Status Alignment(2)          .
   .           <------------------------------------           .
   .           .           .           .           .           .
   .      Link Status Alignment(response to Out of Service(2)) .
   .           ------------------------------------>           .
   .           .           .           .   Start timer T1
   .           .           .    Link Status Ready(2)           .
   .           <------------------------------------           .
   .           .           .           .           .           .
   .           Stop timer T2           .           .           .
   .        Link Status Alignment(response to Alignment(2))    .
   .           ------------------------------------>           .
   .           .           .           .  Link fails due to    .
   .           .           .           .  Alignment received in.
   .           .           .           .  Ready state          .
   .           .           .           .                       .
   .           .          Link Status Out of Service           .
   .           <------------------------------------           .
   .           .           .           .           .           .
   .           .           .           .           .           .
   .      Link inservice(received Ready(2))        .           .
   .      Link Status Ready(response to Ready(2))  .           .
   .           ------------------------------------>           .
   .           .           .           .           .           .
   .           .           .           .           .           .
   .      Link Failure (received Out of Service from M2PA-2)   .
   .           Link Status Out of Service          .           .
   .           ------------------------------------>           .
   .           .           .           .           .           .
   .           .           .           .           .           .

Thanks,
Soni