Brocade FICON Administrator’s Guide (Supporting Fabric OS v7.3.0) - Manual (Page 26)

devices to changes in the fabric. Using multiple smaller zones instead of one large zone helps
alleviate the need for channels and device interfaces to process RSCNs that are not relevant.
NOTE
Session-based zoning enforcement is not recommended on a FICON switch. For more information on
session-based zoning enforcement, refer to the Fabric OS Administrator's Guide.
Cascaded zoning
The figure below illustrates multiple sites sharing the same disaster-recovery site. Each switch or
Backbone at a remote site, labeled Director 1 and Director 31, can pass traffic to Director 2, but no
traffic is permitted between Zone A and Zone B.
FIGURE 12 Simple cascaded zoning
The figure below illustrates the multiple zoning concepts that can be used to restrict traffic. Any host
channel at the Backup Site (connected to Director 11 or Director 12) can connect to the backup tape
contained within the same zone. Notice that no more than a single hop is ever allowed and only
Channel Path Identifiers (CHPIDs) 79 and 7A on the Primary Site can connect to the backup tape.
Furthermore, CHPIDs 79 and 7A can only connect to the backup tape at the Backup Site.
Cascaded zoning
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