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+Network Working Group                                    David C. Walden
+RFC #440                                                 BBN-NET
+NIC #13772                                               January 1973
+Updates: 381,406
+
+
+                 Scheduled Network Software Maintenance
+                 --------------------------------------
+
+    As explained in RFC 381, we believe that we can minimize
+the disruption caused by the release of new IMP software systems by
+doing them on a regularly scheduled basis.  In the past we have
+reserved the one hour period from 7am until 8am every Tuesday morning
+for our IMP system scheduled software maintenance period.  As the size
+of the network has grown to about forty IMPs, we find we can no longer
+complete a system release to all IMPs in the one hour scheduled.
+Therefore, we are extending our scheduled software maintenance period
+to two hours from 7am until 9am eastern time every Tuesday
+morning. The extended period will take effect as of the first Tuesday
+in February.  As we said in RFC 381, we will not always use the
+Tuesday morning period, but we always reserve it.  On Tuesday mornings
+when we _do_ use the scheduled software maintenance period, a type 2 IMP
+to Host message* will be sent to all Hosts about an hour in advance of
+the period.
+
+    We understand that the software maintenance period cannot
+continue to grow linearly with the number of IMPs, and we will find a
+way around this problem before software releases start taking 168
+hours a week.
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+*An IMP-GOING-DOWN-FOR-SCHEDULED-SOFTWARE-MAINTENANCE message.
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+       [ This RFC was put into machine readable form for entry ]
+       [ into the online RFC archives by Alex McKenzie with    ]
+       [ support from GTE, formerly BBN Corp.             9/99 ]
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+Walden                                                          [Page 1]
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