Brocade FICON Administrator's Guide v7.1.0 (53-1002753-01, March 2013)

FICON Administrator’s Guide 63
53-1002753-01
Traffic Isolation Zoning
5
FIGURE 15 Typical triangular setup
During normal operation, the routes from any device on one switch are a one-hop path to either of
the other two switches. However, if the path between any pair of switches fails then a two-hop path
is available. Multi-hop paths are not certified for FICON configurations.
To get around the multiple-hop issue, use Enhanced TI Zoning to prohibit the connection between
E_Ports on the switches. 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.
CU BCU A
ISL 3
ISL 1 ISL 2
Flow B
Flow C
Flow A
Channel