I don't think I'd trust any vendor's "ISSU" to be completely without impact...been more of a marketing term from my experience...
> On Feb 18, 2016, at 10:51 AM, Nick Hilliard <n...@foobar.org> wrote: > > Jason Bothe wrote: >> The 9k does however get a huge win with the ability to apply a ‘pie’ >> or software patch while staying in service vs requiring a reload. > > SMUs are often "hitless", which is to say, "hitless" with scary quotes. > What this means in practice is that the SMU itself might be hitless but > it will depend on 47 other SMUs, thereby almost guaranteeing some form > of reload. Also, restarting processes is "hitless" (e.g. restarting > bgpd, ospfd, etc) or shutting down interfaces. > > E.g.: > > CSCuo47663: "Hitless/Optional SMU,aigp metric different in RIB & BGP > table". This will restart the bgp process. > > CSCus26923: "traffic from SIP700 to 9000v is dropped when a link to > 9000v flaps". Release notes state that the issue is not service > impacting, then "After the SMU installation , we need to apply > shut/noshut of the problematic interface to trigger the hardware > programming." Wuh?? > > In other words, "hitless" does not mean "not service impacting". > > Nick
