Many (most?) network operating systems are an image file that the switch either writes over a partition (ie. block-level copy) or boots directly (ie. initrd/initramfs) with a separate partition for a config file. Junos is a full BSD operating system that installs packages to partitions on the device, runs upgrade scripts, etc.
-- Eldon On Fri, Mar 8, 2019 at 12:28 PM Gert Doering <g...@greenie.muc.de> wrote: > > Hi, > > On Fri, Mar 08, 2019 at 10:38:16AM +0100, "Rolf Hanßen" wrote: > > usually they say not more than 2 major releases in one step (i.e. 13 -> 15 > > -> 17). > > So why is that? > > Genuinely curious, as I do not have much JunOS upgrade experience - and > my Cisco IOS experience so far has been "you can go from wherever you > are to wherever you want to go" - when going up, you can hit warnings > about "old config syntax", and when going down, you might lose config > bits that are "new" - but besides this, things generally work. > > gert > > -- > "If was one thing all people took for granted, was conviction that if you > feed honest figures into a computer, honest figures come out. Never doubted > it myself till I met a computer with a sense of humor." > Robert A. Heinlein, The Moon is a Harsh Mistress > > Gert Doering - Munich, Germany g...@greenie.muc.de > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp