RE: Regarding J0 byte in LMP test message

[Nik Langrind <nik@equipecom.com>]

Hi,

One aspect of Bhavesh's question that sparked my interest: CR/LF. I don't
know whether the IP packet should be followed with a CR/LF or not. It seems
to me that one ought to follow up the packet with a CR/LF, so that if the
other end's SONET framer syncs to it, the IP packet will end up sitting in
the received section trace buffer with the IP Vers/Header Length field in
the first byte of the buffer.

On the other hand, one's receive code can't necessarily rely on this, right?
So when I am testing, anytime I get a stable section trace messages, I ought
to rotate through every byte, looking for IPV4, and calculating the IP
header checksum to ensure that I've found the right starting point.

What are others doing?

Thanks,
Nik

> -----Original Message-----
> From: Jonathan Lang [mailto:jplang@calient.net]
> Sent: Thursday, May 16, 2002 1:39 PM
> To: 'Bhavesh Patel'; 'ccamp@ops.ietf.org'
> Subject: RE: Regarding J0 byte in LMP test message
> 
> 
> Bhavesh,
>   The answers to your questions can be found in Section 14.9 
> of the LMP
> draft. Please look at the Verify Transport Mechanism.
> 
> Thanks,
> Jonathan
> 
> > -----Original Message-----
> > From: Bhavesh Patel [mailto:bpatel@fwion.com]
> > Sent: Thursday, May 16, 2002 5:53 AM
> > To: 'ccamp@ops.ietf.org'
> > Cc: Bhavesh Patel
> > Subject: Regarding J0 byte in LMP test message
> > 
> > 
> > 
> > Hi,
> > 
> > I have a question regarding LMP link verification.
> > 
> > 1)Why did the authors of LMP protocol choose J0 byte for 
> sending test
> > message when encodingType=sonet? Is it because the OXC/PXC 
> falls in the
> > section portion of sonet network?
> > 2) Why the need to make J0 byte IP encoded message? why it 
> cannot be an
> > ascii string with CR/LF termination similar to J1 byte?
> > 2) In a metro network application where one deploys PXCs 
> connected point
> to
> > point, what does it fall under section/line/path (assume 
> PXC is doing some
> > O-E-O for lmp test message needs for sending over data 
> bearing links)?
> > Why not use J1 byte for lmp test message? 
> > 
> > Your replies are appreciated.
> > 
> > Bhavesh Patel
> > Embedded Software 
> > bpatel@fwion.com <mailto:bpatel@fwion.com>
> > 732-946-7400, ext 2087
> > 
> > 
>