Subject: Arch Items 8349 and 8350

From: "J. G. Dudley (444/4358)" <[email-masked]>
Date: Fri, 11 Oct 96 16:19:52 EDT

I plan to ask for approval of the two subject items at the APPN
Architecture Reference SIG at AIW12 in November.  Summaries of the
changes are attached below.  The change pages are on the AIW Document
Repository.  Please review the changes; both documents are quite short.

Site:       networking.raleigh.ibm.com
Directory:  /pub/standards/aiw/appn/architecture
Files:      arch8349.psbin
            arch8350.psbin

Thanks,
Gary Dudley
------------------------------------------------------------------------

8350 Quiescing Connection Network TGs
-------------------------------------

Currently, the CS chapter indicates that a connection network TG is
reported as "not operational" when the number of link stations
reaches the port's total link-activation limit threshold; typically, the
threshold is the limit.  The TG is reported as "operational" when
the number of link stations falls to 80% of the total link-activation
limit.

The HPR/ATM architecture extends this concept to ATM connection networks
and suggests a similar mechanism be used to manage the port's bandwidth.
Furthermore, the HPR/ATM architecture indicates that ATM connection
network TGs should be reported as "quiescing" rather than "not
operational" when the total link-activation-limit threshold is reached.
This setting is more descriptive of the actual situation because traffic
continues to flow across the connection network; only the activation of
additional dynamic link stations is prevented.  Inactive auto-activatable
links, by contrast, continue to use the "not operational" setting.

I proposed this change at AIW9.  The APPN Reference SIG agreed to the
change pending review of the change pages.

8349 Auto-Activation Enhancements
---------------------------------

Currently, the CS chapter indicates that a link must be activated before
the associated TG is reported operational to TRS because the TG number
must be determined during the activation XID exchange.  Several APPN
products have implemented an enhancement, wherein DEFINE_LS(RQ) triggers
CS to report auto-activatable TGs as operational provided a predefined
TG number and an adjacent CP name are specified.  This item encorporates
this enhancement into the APPN Architecture.

In addition, the CS chapter currently indicates that only one adjacent
link station may be active at a time on ports supporting switched link
connections.  However, the HPR SIG has approved the HPR/ATM architecture
that allows an ATM port to support multiple adjacent link stations that
are operational simultaneously.  This item also modifies the APPN
Architecture Reference to allow multiple simultaneous switched
connections.