nanog mailing list archives
Re: Whats so difficult about ISSU
From: Kasper Adel <karim.adel () gmail com>
Date: Mon, 12 Nov 2012 08:21:32 +0200
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
Current thread:
- Re: Whats so difficult about ISSU, (continued)
- Re: Whats so difficult about ISSU Saku Ytti (Nov 11)
- Re: Whats so difficult about ISSU Randy Bush (Nov 11)
- Re: Whats so difficult about ISSU Phil Regnauld (Nov 11)
- Re: Whats so difficult about ISSU Joe Greco (Nov 11)
- Re: Whats so difficult about ISSU Felipe Zanchet Grazziotin (Nov 11)
- Re: Whats so difficult about ISSU Gary Buhrmaster (Nov 11)
- Re: Whats so difficult about ISSU Gary Buhrmaster (Nov 11)
- Re: Whats so difficult about ISSU Miquel van Smoorenburg (Nov 11)
- Re: Whats so difficult about ISSU Jimmy Hess (Nov 11)
- Re: Whats so difficult about ISSU Kasper Adel (Nov 11)
- Re: Whats so difficult about ISSU Bryan Fields (Nov 11)
- Re: Whats so difficult about ISSU Mikael Abrahamsson (Nov 11)
- Re: Whats so difficult about ISSU Tim Jackson (Nov 12)
- RE: Whats so difficult about ISSU Frank Bulk (Nov 12)