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Whats so difficult about ISSU

On 11/12/12 1:21 AM, Kasper Adel wrote:
> 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.

And they only have to process maybe 2mbit/s of control traffic during busy
hour.  The rest is handled by dedicated hardware/ASIC's.  Each one has a fully
redundant hardware circuit pack and a bunch of monitoring to switch over in
case one fails.

Even then, it's fun when some one screws up and reboots it :)
Bryan Fields

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