[157846] in North American Network Operators' Group
RE: Whats so difficult about ISSU
daemon@ATHENA.MIT.EDU (Frank Bulk)
Sun Nov 11 23:13:43 2012
From: "Frank Bulk" <frnkblk@iname.com>
To: "'Kasper Adel'" <karim.adel@gmail.com>,
"NANOG list" <nanog@nanog.org>
In-Reply-To: <CALb2afM1G1KHRMWM7PE0XUYdtJscD319_LhSxBJxkCxZs3aDZg@mail.gmail.com>
Date: Sun, 11 Nov 2012 22:13:19 -0600
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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]
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
