Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 346)

Enhanced TI zones
In Fabric OS v6.4.0 and later, ports can be in multiple TI zones at the same time. Zones with
overlapping port members are called enhanced TI zones (ETIZ). Enhanced TI zones are especially
useful in FICON fabrics.
The following figure shows an example of two TI zones. Because these TI zones have an overlapping
port (3,8), they are enhanced TI zones.
FIGURE 36 Enhanced TI zones
See the FICON Administrator's Guide for example topologies using enhanced TI zones.
See Additional configuration rules for enhanced TI zones on page 358 for more information about
enhanced TI zones.
Illegal configurations with enhanced TI zones
When you create TI zones, ensure that all traffic from a port to all destinations on a remote domain
have the same path. Do not create separate paths from a local port to two or more ports on the same
remote domain.
If the TI zones are configured with failover disabled, some traffic will be dropped. If the TI zones are
configured with failover enabled, all traffic will go through, but half of the traffic will be routed
incorrectly according to the TI zone definitions.
A message is sent to the RASlog if a potential error condition is detected in the TI zone configuration.
You can also display a report of existing and potential problems with TI zone configurations, as
described in
Troubleshooting TI zone routing problems on page 370.
Illegal ETIZ configuration: separate paths from a port to devices on same domain
Figure 37 shows two enhanced TI zones that are configured incorrectly because there are two paths
from a local port (port 8 on Domain 3) to two or more devices on the same remote domain (ports 1 and
4 on Domain 1).
Enhanced TI zones
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