Subject: Re: Sept. AIW/DS question

From: [email-masked] (Dave Finnie)
Date: Tue, 10 Aug 93 09:07:49 EST

I have been through much of the new (-3) APPN reference. As a side note I think it reads
very well, and the tough concepts are explained well.

After reading the Directory Services chapter I was left with this question:

  If a directed locate search request is sent to NNS(DLU), and the receiver does not have
  a cached entry, I understand that it should broadcast to its local domain.

  The normal action for the result of a +ve reply to a broadcast is to propagate it
  immediately to the sender of the request, and then follow with a neutral reply if all other
  responses are negative.

  Since a directed locate search would normally result in a single +ve/-ve reply, should
  NNS(DLU) wait for all responses from the domain broadcast before issuing a reply, or
  should it send a +ve reply immediately after receiving it from an adjacent APPN EN ?

  Similarly, should the NNS(OLU) tolerate either type of response to a directed locate ?

Maybe this could be used as one of the clarification points on DS in the upcoming AIW.

Dave

---

From: "Ralph Case" <[email-masked]>
Date: Fri, 13 Aug 93 14:23:38 EDT

Ref:     Append at Tue, 10 Aug 93 09:07:49 EST by [email-masked] (Dave Finnie)

  The NNS(OLU) that issues a directed locate only expects
  one reply.  Once a positive reply has been returned,
  no additional positive or neutral replies are expected
  or allowed.  Therefore, the NNS(DLU) should only send
  one reply to a directed locate.

  However, your question has pointed out some issues that
  need to be clarified.  We are working on some questions
  related to domain broadcasts, specifically relating to
  cases where cached information in the NNS(OLU) may not
  match information in the NNS(DLU), and Border Node
  functions.  In fact, it appears that several of our
  products may implement this differently.

  We'll get back to you with more details.

Ralph Case
APPN Architecture
Networking Systems, IBM       [email-masked]    (919)254-1882