Hi, Gurpreet:

     I think there could be two cases in which no explict acknowledgments
are needed:
     1. The case described by section 13, 7(a);
     2. In DB sync in which router A sends a request to router C. When
router C responds to this request with some link state update, router A may
send the next request or do nothing if there is no further request. Refer to
RFC2328, p105. My understanding is that in this case, the next request or no
request may serve as an implicit ack because if the update is not received
by router A, it will resend its request again.

Feng Xie

-----Original Message-----
From: Singh, Gurpreet [mailto:Gurpreet.SinghSPIRENTCOM.COM]
Sent: Monday, October 22, 2001 5:48 PM
To: OSPFDISCUSS.MICROSOFT.COM
Subject: Re: Acknowledgement for Router LSA from DROther.

Hi Xie

      However,
        acknowledgments can also be accomplished implicitly by sending
        Link State Update packets (see step 7a of Section 13)."

Does this mean that implied acknowledgement is done only in the case of 7a
of section 13 ?
Section 7a is valid only for LSAs for which the router has the same instance
in the database as the received LSA.

Gurpreet

-----Original Message-----
From: Xie, Feng [mailto:Feng.XieMARCONI.COM]
Sent: Monday, October 22, 2001 5:36 PM
To: OSPFDISCUSS.MICROSOFT.COM
Subject: Re: Acknowledgement for Router LSA from DROther.

Hi, Gurpreet:

    According to RFC2328, p152,

    "Each newly received LSA must be acknowledged. This is usually
        done by sending Link State Acknowledgment packets. However,
        acknowledgments can also be accomplished implicitly by sending
        Link State Update packets (see step 7a of Section 13)."

    Base on the above statement, my understanding is that A may not need to
send an explicit link acknowledgment for every router lsa it receives from C
if the router lsa is received during DB sync.

Feng Xie

-----Original Message-----
From: Singh, Gurpreet [mailto:Gurpreet.SinghSPIRENTCOM.COM]
Sent: Monday, October 22, 2001 5:27 PM
To: OSPFDISCUSS.MICROSOFT.COM
Subject: Acknowledgement for Router LSA from DROther.

Hi

    If there are three routers on the same sub-net A (DR) , B (Backup DR)
and C (DR Other). Should A acknowledge a router LSA (which A does not have a
copy in the database) received from C ? i.e. should router LSA from a
DROther be acknowledged by the DR (Designated Router)

Thanks

Gurpreet

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