HP StorageWorks 64 - SAN Director Switch Planning Manual page 88

Planning Considerations for Fibre Channel Topologies
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Zoning configurations for joined fabrics — In a multi-switch fabric, zoning
is configured on a fabric-wide basis, and any change to the active zone set is
applied to all directors and switches. To ensure zoning is consistent across a
fabric, the following rules are enforced when two fabrics (zoned or unzoned)
join through an ISL.
— Fabric A unzoned and Fabric B unzoned — The fabrics join
successfully, and the resulting fabric remains unzoned.
— Fabric A zoned and Fabric B unzoned — The fabrics join successfully,
and fabric B automatically inherits the zoning configuration from fabric
A.
— Fabric A unzoned and Fabric B zoned — The fabrics join successfully,
and fabric A automatically inherits the zoning configuration from fabric
B.
— Fabric A zoned and Fabric B zoned — The fabrics join successfully
only if the zone sets can be merged. If the fabrics cannot join, the
connecting E_Ports segment and the fabrics remain independent.
Zone sets for two directors or switches are compatible (the fabrics can join)
only if the zone names for each fabric element are unique. The zone names for
two fabric elements can be the same only if the zone member WWNs are
identical for each duplicated zone name.
SAN High Availability Planning Guide