Subject: RE: ZLB Ack.

From: "Verma, Rohit (US - Chicago)" <[email-masked]>
Date: Fri, 14 Apr 2000 10:02:43 -0400

Most of the time, you would like to conserve bandwidth, so you waould want
to piggyback your ack on information packets. (Such as ack for the SCCRQ can
be sent in the SCCRP msg)
The ZLB ack procides you a mechanism to accoplish, sending acks without the
information. Hence when you do not have any information to piggyback the ack
on, you should send a ZLB ack.

Hope this helps

Regards

Rohit Verma
Deloitte Consulting
180, N. Stetson Avenue,
Chicago, IL 60601
312-374-2475

-----Original Message-----
From: HOULLIER Francis FTRD/DMI/CAE
[mailto:[email-masked]]
Sent: Friday, April 14, 2000 3:08 AM
To: 'Mailing liste L2TP'
Subject: ZLB Ack.

What is the condition to send a ZLB Ack (see the example below), is this a
timer or something else ? The rfc says only that "the ZLB Ack is sent if
there are no futher messages waiting in the queue".

LAC						LNS

SCCRQ ---->
					<----SCCRP
SCCCN ---->
					<----ZLB ACK

But generally after the SCCCN, the LAC sends an ICRQ and the LNS can't send
the ZLB ACK.
Thank you for your help.