RFC343 - IMP System change notification

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　　Network Working Group A. McKenzie
Request for Comments: 343 BBN-NET
NIC #10422 19 May 1972
Category: B.1
Obsoletes: RFC#331

IMP System Change Notification

As most of you probably know, our attempt to release IMPSYS 2600 on
May 15 (as discussed in RFC#331) was unsuccessful. Briefly, the
primary reasons for failure (all operational rather than programming
bugs) were:

1) The.network appears to have grown too large for us to
successfully coordinate operator intervention at all sites.

2) An unanticipated aspect of the gradual release of the new
system was the "poisoning" of IMP's running the new system by
adjacent IMP's running the old system, and vice versa. Working
around this problem made the dissemination of the new system
take much longer than anticipated.

We believe we see solutions to both of these problems and are now
ready to schedule the next attempt(s) to release IMPSYS 2600. We
hereby request all sites to cooperate with this effort in the
following ways.

I. All sites with Model 516 IMP's have been contacted by telephone and
asked to set the switches on their IMP's as follows:

HALT INH - off
W.D.T. - off
AUTO RSTRT - on
MEMORY PRTCT - off

Please be sure that your switches remain set at these positions
until further notice.

II. No site should attempt to use the IMP's "Trace" routine during the
day(s) of the attempted system release.

III. Terminal IMP's may be turned off for significant portions of the
day(s) of the attempted system release. Please be patient with any
inconvenience which this causes.

IV. We hope to accomplish release of IMPSYS 2600 on the next attempt.
Nevertheless, we are not omniscient and may again be thwarted by
difficulties. Accordingly, we are scheduling the next attempt for
Wednesday, May 31, and subsequently every Tuesday (June 6, 13, 20,
...) until the release is successfully accomplished. We will
arrange the release process so that site operator coverage is not
required; nevertheless we hope that the normal site operator
coverage is available in case unanticipated problems develop.
Release of the new system will begin early in the day
(approximately 7 a.m. EDT). We again suggest that sites do not
schedule production work over the network during the release
attempt(s). We will notify each site by phone after the release
has been successfully completed.

Finally, we apologize in advance for any inconvenience caused by
the contortions required to release this new system, and thank all
of the site operations' staffs who worked with us on May 15 for
their cooperation.

AAM/jm

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