Hey there,

We just published a new guide on ignaonline.com:

Cisco Catalyst 9000 (Cat9K) IOS-XE Upgrade Guide: Install Mode, ISSU, and Common Gotchas

If you manage Cisco Catalyst 9000 switches, this one's worth bookmarking. We cover the full install mode upgrade workflow, how to verify stack health before touching anything, the most common failure scenarios (including getting stuck in ROMMON), ISSU pre-checks and when it won't work, and clean rollback procedures.

There's also a new section on choosing the right IOS-XE release train — something that gets overlooked until it bites you.

Read the full post here: https://ignaonline.com/cisco-catalyst-9000-cat9k-ios-xe-upgrade-guide-install-mode-issu-and-common-gotchas/

Happy networking,
The ignaonline.com team