Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 348)

FIGURE 38 Illegal ETIZ configuration: two paths from one port
Traffic Isolation Zoning over FC routers
This section describes how TI zones work with Fibre Channel routing (TI over FCR). Refer to Using
FC-FC Routing to Connect Fabrics on page 533 for information about FC routers, phantom switches,
and the FC-FC Routing Service.
Some VE_Port-based features, such as tape pipelining, require the request and corresponding
response traffic to traverse the same VE_Port tunnel across the metaSAN. To ensure that the request
and response traverse the same VE_Port tunnel, you must set up Traffic Isolation zones in the edge
and backbone fabrics.
• Set up a TI zone in an edge fabric to guarantee that traffic from a specific device in that edge fabric
is routed through a particular EX_Port or VEX_Port.
• Set up a TI zone in the backbone fabric to guarantee that traffic between two devices in different
fabrics is routed through a particular ISL (VE_Ports or E_Ports) in the backbone.
This combination of TI zones in the backbone and edge fabrics ensures that the traffic between
devices in different fabrics traverses the same VE_Port tunnel in a backbone fabric.
Figure 39 shows
how three TI zones form a dedicated path between devices in different edge fabrics. The backbone
fabric can contain one or more FC routers.
Traffic Isolation Zoning over FC routers
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