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In-Reply-To: <001001cdc08c$0c4fc040$24ef40c0$@iname.com> Date: Mon, 12 Nov 2012 08:21:32 +0200 From: Kasper Adel <karim.adel@gmail.com> To: Frank Bulk <frnkblk@iname.com> Cc: NANOG list <nanog@nanog.org> Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org Hi Frank, Is it because C5 softswitches have expensive hardware, advanced software and dual asics? I would have never imagined that any vendor is capable of upgrading fpd's/ASICs ucode without a hit unless there are multiple chips continuously syncing with each other. Regards, Kim On Monday, November 12, 2012, Frank Bulk wrote: > We do it on our Class 5 softswitch ... and it works consistently. There > may > be a few seconds, once, where a new call can't be made, but most people > will > re-dial. It just works. > > It can be done, but the product has to be built with that in mind. > > Frank > > -----Original Message----- > From: Kasper Adel [mailto:karim.adel@gmail.com <javascript:;>] > Sent: Thursday, November 08, 2012 5:23 PM > To: NANOG list > Subject: Whats so difficult about ISSU > > Hello, > > We've been hearing about ISSU for so many years and i didnt hear that any > vendor was able to achieve it yet. > > What is the technical reason behind that? > > If i understand correctly, the way it will be done would be simply to have > extra ASICs/HW to be able to build dual circuits accessing the same memory, > and gracefully switch from one to another. Is that right? > > Thanks, > Kim > > >
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