You know all your interfaces. The neighbors that
you want are all the ones attached to those interfaces.
You *could* figure out *exactly* who they were by
listening for hellos for a while, but I wouldn't
bother. Just send the grace-LSAs out each interface
n times, where n= the interface's Dead/Hello interval.

John

-----Original Message-----
From: Alex Zinin [mailto:azinincisco.com]
Sent: Tuesday, March 27, 2001 1:34 PM
To: Moy, John
Cc: OSPFDISCUSS.MICROSOFT.COM
Subject: Re: draft-ietf-ospf-hitless-restart-00.txt,
draft-ietf-idr-restar t-00.txt

John,

> They are *all* the potential neighbors.

And how do you know them all when you have just
started?

Alex.

> You know who *they* are. After some number of
> retransmissions, you assume that they are not
> there.

> John

> -----Original Message-----
> From: Alex Zinin [mailto:azinincisco.com]
> Sent: Tuesday, March 27, 2001 1:25 PM
> To: Moy, John
> Cc: OSPFDISCUSS.MICROSOFT.COM
> Subject: Re: draft-ietf-ospf-hitless-restart-00.txt,
> draft-ietf-idr-restar t-00.txt

> John:

>>> How can you guarantee that the neighbors do receive the Grace
>>> LSA before the first Hello from the restarting OSPF process and that
>>> they receive it _before_ the Hello?

>> You retransmit the grace-LSA until they acknowledge it, and

> This question has already been discussed (quote below).
> The restarting router does not know who "they" are.

> Alex.

>> Thursday, January 04, 2001, 12:28:30 PM, Moy, John wrote:

>>> From: Acee Lindem [mailto:aceeREDBACK.COM]

>>> John,
>>
>>> Wouldn't a router also have to remember it's full
>>> neighbors (independent of whether or not cryptographic
>>> authentication is in use) in order to reliably
>>> flood the link local LSA? If not, aren't some slight
>>> modifications to link local flooding required?
>>
>> Acee-
>>
>> No, you don't have to remember. If you are sending
>> the grace-LSA *after* the restart (something I
>> wouldn't personally recommend, but I know it's
>> something that Alex wants to support), you're not really
>> flooding it since you (the restarting router) no
>> longer have a full adjacency anyway, so just
>> sending it out all interfaces suffices. If you want
>> to be extra sure that the (old) full neighbors get it,
>> you can send it more than once... (but I wouldn't
>> bother personally).

>> John
>>

>> then you send your first hello. If your implementation can't
>> do this for some reason, you modify your implementation.

>> John

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