Compared to our CMTS, our class 5 softswitch cost us less money. Yet our CMTS vendor stopped talking about hitless software upgrades 2 years ago because the upgrade path (from, to, and which software releases you can use) is so limited it's hardly practical.
Frank From: Kasper Adel [mailto:karim.a...@gmail.com] Sent: Monday, November 12, 2012 12:22 AM To: Frank Bulk Cc: NANOG list Subject: Re: Whats so difficult about ISSU 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.a...@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
