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Whats so difficult about ISSU
On Thu, 8 Nov 2012, Phil wrote:
> The major vendors have figured it out for the most part by moving to
> stateful synchronization between control plane modules and implementing
> non-stop routing.
NSR isn't ISSU.
ISSU contains the wording "in service". 6 seconds of outage isn't "in
service". 0.5 seconds of outage isn't "in service". I could accept a few
microseconds of outage as being "ISSU", but tenths of seconds isn't in
> The main remaining hurdle is updating microcode on linecards, they still
> need to be rebooted after an upgrade.
... and as long as this is the case, there is no ISSU. There is only
"shorter outages during upgrade compared to a complete reboot".
Mikael Abrahamsson email: swmike at swm.pp.se