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This is a modified version of the Internet RFC suitable for machine-translating. Original version is available here: RFC406

Network Working Group                        John M. McQuillan
Request for Comments # 406                   Bolt Beranek and Newman
NIC # 12111                                  10 October 1972
Categories B.1
Updates RFC # 381

                    Scheduled IMP Software Releases

This note is a reminder that the procedures suggested in
RFC # 381 for scheduling IMP software maintenance have now been in effect for a period of about two months. Two points apparently require re-emphasis:

1) We reserve the hour from 7 to 8 a.m. eastern time
every Tuesday as the time when IMPs can be reloaded. We will probably not use this period every Tuesday, but we do reserve this period every Tuesday. The software maintenance time period is in addition to the hardware preventive maintenance scheduled at each site.

2) We now send an IMP - Going - Down message to all
the Hosts at the site which contains information on the time that the IMP is going down, the expected duration, and the reason. We try to send out this message an hour before soft- ware releases, and five to ten minutes before scheduled pre- ventive maintenance. Further, we will also notify the Hosts at a site, whenever possible, when it is necessary to stop the IMP on an unscheduled basis. Finally, 30 seconds before the sent to the Hosts informing them that the IMP is going down immediately. The format of the IMP - Going - Down message is as follows:
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IMP goes down, a second IMP - Going - Down message will be

bits 1 - 4 - all zero

bits 5 - 8 - 0010

bits 9 - 16 - all zero

bits 17 - 32 - coded as follows:

All bits zero - going down in 30 seconds

Bits 17, 18 = 01 - scheduled hardware PM

Bits 17, 18 = 10 - scheduled software reload

Bits 17, 18 = 11 - emergency reload on restart

Bits 19 - 22 - how soon the IMP is going down,
in 5 minute units.

Bits 23 - 32 - how long the IMP will be down, in
5 minute units.

[ This RFC was put into machine readable form for entry ] [ into the online RFC archives by BBN Corp. under the ] [ direction of Alex McKenzie. 1/97 ]

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