
Aliases that have the same WWN on both secondary and primary switches, must have the same name on both fabrics.
If you have similar alias names on the 2 different switches, you have to rename the aliases/zones on the secondary switch (the one that you can disable to merge the fabric).
Aliases and zone names must be unique before merging the fabric. If you have a lot of traffic going from one switch to another switch, it's advised to purchase the "Trunking License" to allow aggregating multiple FC ports/links together. If they are different, "Zone Conflict" error will show on the secondary switch. Switch configuration names must be the same for the fabric to merge. The 2 switches connecting to each other must have different Domain IDs. Change Domain ID from default value to a unique value. It's available by default on 48-port switches.
Full Fabric license must be available on 24-port switches.The minor version ".x" does not have to match, but it's recommended to keep the switches on the same level, if possible. Fabric OS has to be 6.x or 7.x on all switches connecting to each other.