What is a recommended guideline for merging two Fibre Channel fabrics?

While domain IDs must be unique across the merged fabric, changing them to consecutive values is not a specific requirement or guideline; ensuring uniqueness is key.

Disabling zoning prior to a merge would remove all access controls and expose all devices to each other, which is a major security and stability risk and not a recommended practice.

Connecting fabrics one ISL at a time is a critical best practice because it allows the fabrics to merge incrementally, giving the principal switch election process and fabric stability time to complete before more links are added, which helps prevent instability or disruptions. This controlled merge allows the Fibre Channel switches to properly negotiate and form a single, stable fabric.

Logging out from the principal switch is not a recommended step; the principal switch plays a critical role in fabric management during the merge.