HP AE370A HP StorageWorks Fabric OS 6.x administrator guide (5697-0015, May 20 - Page 333

In Figure 23, a dedicated path between Domain 1 and Domain 4 exists, but is not the shortest path. In this situation, if failover is enabled, the TI zone traffic uses the shortest path, even though the E_Ports are not in the TI zone. If failover is disabled, the TI zone traffic stops until the dedicated path is configured to be the shortest path. Domain 1 8 1 9 3 Domain 3 9 14 12 15 7 16 6 = Dedicated Path = Ports in the TI zone Domain 2 Figure 23 Dedicated path (but not the shortest path) General rules for TI zones 5 Domain 4 Note the following general rules for TI zones: • A given N_Port can be a member of only a single TI zone. This rule is enforced during zone creation or modification. • An E_Port can be a member of only a single TI zone. The same checking is done as described for N_Ports. If multiple E_Ports are configured that are on the lowest cost route to a domain, the various source ports for that zone are load-balanced across the specified E_Ports. • The TI zones appear in the defined zone configuration only and do not appear in the effective zone configuration. A TI zone only provides Traffic Isolation and is not a "regular" zone. • A TI zone must include a set (two or more) of E_Ports forming an end-to-end path. Inclusion of N_Ports is optional. • Each TI zone is interpreted by each switch and each switch considers only the routing required for its local ports. No consideration is given to the overall topology and to whether the TI zones accurately provide dedicated paths through the whole fabric. For example, in Figure 24, the TI zone was configured incorrectly and E_Port "3,9" was erroneously omitted from the zone. The domain 3 switch assumes that traffic coming from E_Port 9 is not part of the TI zone and so that traffic is routed to E_Port 11 instead of E_Port 12, if failover is enabled. If failover is disabled, the route is broken and traffic stops. • You create and modify TI zones using the zone command. Other zoning commands, such as zoneCreate, aliCreate, and cfgCreate, cannot be used to manage TI zones. Fabric OS 6.x administrator guide 333