[j-nsp] 32-Bit JunOS on the 64-Bit Routing Engines

[Hannes Viertel]

Thomas,

the hardware itself could theoretically run both 32/64 bit junos. 

But your SE was completely right. Only 64 bit Junos is systested and therefore supported on the new RE's. 

As Robert pointed out,  32/64 bit use the same codebase and at the current point in time only the kernel is enabled to handle the additional memory.  Therefore some of the memory maps/footprints changed slightly. No other daemons have moved to 64bit. 

But it is still recommended to handle/test/verify 32/64bit sw of the same junos release as separate pieces of software. There might be architectural issues that just affect one piece of sw and not the other. 

hope that helps

/hannes





> 
> 
> ------ Weitergeleitete Nachricht
> Von: Thomas Eichhorn <te at te3networks.de>
> Datum: Wed, 24 Aug 2011 13:27:14 +0100
> An: Keegan Holley <keegan.holley at sungard.com>
> Cc: <juniper-nsp at puck.nether.net>
> Betreff: Re: [j-nsp] 32-Bit JunOS on the 64-Bit Routing Engines
> 
> Yeah, that is clear - my original point is:
> 
> I do not trust the 64bit software - I have more faith in the 32bit software.
> 
> As per now, it has equal cost to order an MX960 with 32b-4G-RE or
> 64b-16G-RE.
> 
> So of course I would order the bigger RE but only if I can use the
> the matured software...
> 
> Tom
> 
> 
> Am 24.08.2011 14:19, schrieb Keegan Holley:
> > Interestingly enough my SE told us this is possible at lease on our Mx480 and MX960 boxes. Our lab boxes are otherwise engaged at the moment so we havent tested. One note regarding general computing though.  The processor can only address 4G (3.8 or so actually) of ram with a 32 bit word size.  So even if you get the re's running the 32 bit code they will only register 4G of the precious 16G.
> >
> > Sent from my iPhone
> >
> > On Aug 24, 2011, at 3:12 AM, Thomas Eichhorn<te at te3networks.de>  wrote:
> >
> >> Hi all,
> >>
> >> I just discussed the following with my SE:
> >>
> >> I wanted to get new 64Bit REs with some new gear,
> >> but run the 32-Bit JunOS on them - he denied that
> >> this is possible.
> >>
> >> I tried to research that, but have not yet found
> >> something in the docs - does anybody here have some clue
> >> about that?
> >>
> >> As the REs are 'only' standard PCs, I do not see any reason
> >> for them to be not capable of running 'legacy' 32Bit JunOS.
> >>
> >> I would be really glad if someone has some clue about that and
> >> could unearth the truth.
> >>
> >> Thanks,
> >> Tom
> >> _______________________________________________
> >> juniper-nsp mailing list juniper-nsp at puck.nether.net
> >> https://puck.nether.net/mailman/listinfo/juniper-nsp
> >>
> 
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