Subject: HRP in Mainframes?

From: [email-masked] (Adam Dunstan)
Date: 29 Nov 1995 20:04:29 GMT

Perhaps someone on this list can confirm my understanding of HRP when
implementing it is a network with both subarea and HRP traffic.

I know all of the versions of software I need and would like to go over the
configuration.

Lets say in my network I would like to have a VTAM that is RTP capable (ie an
HRP endpoint for whatever I would like to use, maybe even DLUR/S).  This VTAM
would be started as a Migration Data Host.  The documentation indicates that
it is not possible to activate an NCP from a Migration Data host and to
activate an NCP the VTAM must be a Composite Node.  If I am correct so far,
the documentation states that a Composite Node is an ANR node and because of
this cannot be an HPR (RTP) endpoint.

Following on from this, if my access was via lines connected to an NCP, eg
NTRI's etc, I would need to have a VTAM that was a Composite Node owning the
NCP and then a second VTAM operating as a Migration Data Host.  I would also
need the appropriate channel connectivity between the NCP and the Migration
Data Host NCP, and probably shared DASD to run my appls.

If I am still correct, I would need the Composite Node to support Central
Directory Service and if I wanted to run Extended Border Node I would also
need to be a Composite Node (I am not sure about Peripheal Border Node, but
assume that the same EN to NN rules apply as ISR).

Can someone in the know comment on my statements, and perhaps even provide
some additional info or alternatives on how I could achieve my goad using IBM
equipment.

Thx
Adam Dunstan
[email-masked]

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From: [email-masked] (Dave Mayhew)
Date: Thu, 30 Nov 1995 00:05:27 -0500

There is an excellent red book available which describes what you can and
cannot do, using VTAM & NCP with HPR. It is called VTAM V4R3: High
Performance Routing (HPR) Early User Experience SC24-4507-00. This is a good
overview on configuration etc..which describes better than I could in a
note. You are correct however that VTAM as a ICN cannot be a RTP end point.
(to be fixed in a future release). Vtam in as an ICN in a CNN is anr capable
only and it is ncp under vtam's control which provides anr routing. Also
vtam supports the following DLC's supporting HPR 1) AHHC's and 2) local sna
t2.1 channel connection to NCP. Also these do not support 'no link-level
error recovery' option. Bottom line is with current hardware/software
versions you are significantly restricted on what you can accomplish with
HPR. You would need to have a minimum of 3 vtam's (1 ICN, 1 EN & 1 NN) for
example and connect these with AHHC connections in order to get any RTP
connections established. Another possibility is a ANR/CNN cloud with a two
VTAM's as NN's connected via a T2.1 APPN channels to NCP's...Again this is
much clearer in the redbook than I can describe here. 

Not sure about your comment on shared dasd to run your applications.

Border Node (extended) is only available on VTAM and obviously it must be a
network node (ICN as well). 

again if you only have two vtams, today to wont get RTP. 

You can contact me (offline from this forum ) at my id
([email-masked]) if you wish to discuss further, but get a hold of the
red book as it is a good starting point..

thx 
Dave Mayhew
Royal Bank of Canada