On 12/02/10 12:20, Jason Shearer wrote:
It is my understanding that ISSU will be supported for the same feature set in
the same dev line.
IE - Will work going from SXI to SXI3 but will not work going from SXI to SXJ.
(I know J doesn't exist yet).
Is this how everyone else understands ISSU? Any other known restrictions?
Sorry, yes - I'm confusing things. There are 3 scenarios:
* The old and new image are not ISSU-compatible (different major
releases or feature sets) - in which case an RPR upgrade is the best you
can do.
* The old and new images are ISSU compatible, and the linecard
software has not changed. In this case, the linecards do not need to be
restarted, and downtimes of 0-3 seconds can be achieved because it's
basically just an SSO switchover.
* The old and new images are ISSU compatible but the linecard software
is different, so the linecards need to be restarted into the new image -
this can be a faster, warm boot (if the linecard has enough RAM) or a
slower, cold boot (if not)
I think that's about right?
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