FICON Administrator's Guide v6.4.0 (53-1001771-01, June 2010)

FICON Administrator’s Guide 53
53-1001771-01
Traffic Isolation Zoning
5
To get around the multiple-hop issue, use Enhanced TI Zoning to prohibit the connection between
E_Ports on the directors. For this setup you must define a device in two zones with failover
disabled. Figure 16 shows that the setup allows a source device to reach two separate destinations
over exclusive, one-hop paths, while preventing the source device from taking the two-hop path in
the event of a failure.
FIGURE 16 Triangular topology with Enhanced TI Zones
Figure 16 shows the following TI Zone definitions for the triangular topology:
• Blue zone includes the channel, ISL 1, and CU A.
• Green zone includes the channel, ISL 2, and CU B.
• Red zone includes the CU A, ISL 3, and CU B.
Using these definitions with failover disabled, the topology achieves the desired behavior. The
channel can reach CU A only over ISL 1 and CU B only over ISL 2. If either ISL should fail,
connectivity to the destination with the failed ISL is prevented because the exclusive path has
failed.
CU BCU A
ISL 3
ISL 1 ISL 2
Flow B
Flow C
Flow A
Channel