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AP disjoins and associate with image upgrade after active -> standby during ISSU 17.12.x -> 17.18.1/17.18.2 Direct ISSU upgrade from 17.12 to 17.18.2 will result in AP reload after 17.18.2 ISSU upgrade with approximate downtime of ~5 minutes (may depend on the network traffic and congestion).
This is applicable only for ISSU upgrades.
ISSU from 17.12.X to 17.18.2 requires N+1 ISSU upgrade (17.12.x -> 17.15.4d -> 17.18.2). Intermediate upgrade should be done only from 17.15.4d & later. If you are on 17.15.x release, ISSU upgrade from 17.15.x to 17.18.2 will not be impacted by CSCws53690
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