Subject: Questions on APPN DLUR architecture document

From: Choon Lee <[email-masked]>
Date: Tue, 15 Jun 1993 16:15:28 -0700

I have several questions on the DLUR document, and I am not sure if this
is the right place to ask. If not, please direct me to the appropriate
place.

1. Pg 6-3, last paragraph about PU CHAR.
  (i) For downstream PU (i.e. non-DLUR attached PU), will the PU CHAR
	still be sent? If so, does the DLUR then breaks it up to 
	different RU (RNAA, SETCV and ACTPU) to send to the PU?
  (ii) Does the DLUS only send the PU CHAR if the DLUS and PU belong to
	different subarea network?

2. Fig 6-9.
  Does the "Session Outage Notification" that is sent by the DLUR go
  on the LU-LU session between LUa and LUb ?

3. Fig 6-10.
  Since PU2 does not receive a DACTPU, is it duped into thinking that
  its SSCP-PU session is still alive? Does SSCP-LU and SSCP-PU both have
  to kept up to preserve the LU-LU session?

/choon lee

---

From: Choon Lee <[email-masked]>
Date: Thu, 17 Jun 1993 16:45:38 -0700

Some questions on DLUR :

(1) If a PU is directly attached to multiple DLURs, and/or co-located
	with a DLUR, how does it choose which one to use? Does it
	necessarily select the co-located one over the others?

(2) Page 8-3, section 8.2 DLUR EN tail vector registration
	If there is no DLUR/S involved, the EN waits until it gets a Find
	from its NNS before relaying its tail vector info. Why doesn't it
	do the same (i.e. wait until DLUS asks for it?) in the DLUR/S
	scenerio?

(3) Page 8-4, section 8.2.1 DLUR/S capabilities exchange
	Since a DLUR which is also NN does not do tail vector registration,
	does it also not do the capabilities exchange?

(4) Page 11-2, section 11.2.2 DLUS and PLU in different subnets
	to calculate the route between PLU and DLUR, what is the
	significance of the NNS? Can a route not be determined by the
	NN topology map and the tail vectors?

Regards,
/choon lee