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Cell Relay Retreat>List Archive>month:1997-Feb> msg00267



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Re: SSC OP ! BGN , RS, ER PDUs retransmission

  • From: Mrityunjay Kumar <mrityu@galaxy.npi.stpn.soft.net>
  • Date: Thu, 27 Feb 1997 16:08:03 +0530

Sorry!!!!
Please read that line as: 
" and sends BGAK again, maintaining its state as..."

> 
>         May be after receiving BGREJ PDU, A will send the BGN PDU again but
> with **DIFFERENT SQ***, which will not be treated as re-transmited one by B
> and norma; exchange of PDUs may take place, here after, bringing both A and B
> to DATA_TRANSFER_READY state. If such thing happens then checking for
> re-transmission at B would not be usefull, as U have explained it below(since
> the sscf-user will be reset and incurr the overhead, which they R trying to
> avoid ).
> 

It was BGAK not BGREJ, sorry! Anyway, a reception of BGREJ does indeed
cause the next BGN PDU to have incremented SQ. But in the present case,
since it is a BGAK, overhead is not incurred.

> 2.) In this situation B shall not ignore it, since A has rebooted and VT(SQ),
> has been reset..( Your explaination holds when during first boot VT(SQ) was
> '1' and immediately reboot of A has occured , but suppose during course
> VT(SQ) at A has incremented to certain value and then reboot has ocurred..
> then the above thing U explained doesn't hold, please correct me if I am
> wrong).
> 
Yes, you are absolutely right.

Bye,
Mrityunjay
Network Programs, India.