Comprehensive and Detailed In-Depth

The "Revert" feature in NIOS is a safety mechanism for software upgrades, allowing rollback to the

prior version if issues arise. Here’s how it works:

Mechanism: NIOS retains the previous software version and configuration database after an upgrade.

The "Revert" option (Grid > Upgrade > Revert) swaps back to the old code, preserving the current

DNS zones, DHCP leases, and Grid settings (e.g., member roles).

Conditions:

Revert is available only if the upgrade was successful and the prior version is still stored (not

overwritten by multiple upgrades).

Configuration changes made post-upgrade are kept, unlike a factory reset.

Why True: This aligns with Infoblox’s design to minimize downtime and data loss during version

management, a key focus in INE’s Grid troubleshooting labs.

Counterpoint: If the database schema changes significantly between versions, some settings might

not fully revert, but core DNS/DHCP/Grid data remains intact per documentation.

Practical Example: After upgrading to NIOS 8.6.2 and encountering DNS issues, you’d revert to 8.6.1

in an INE lab, verifying that zone data persists for troubleshooting continuity.

Reference: Infoblox NIOS Administrator Guide – Software Revert; INE Course Content: NIOS DDI Grid

Troubleshooting.