Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 352

12 Traffic Isolation Zoning over FC routers In this example traffic from the Target to Domain 2 is routed correctly. Only one TI zone describes a path to Domain 2. However, both TI zones describe different, valid paths from the Target to Domain 1. Only one path will be able to get to (1,1). Traffic from port (3,8) cannot be routed to Domain 1 over both (3,6) and (3,7), so one port will be chosen. If (3,7) is chosen, frames destined for (1,1) will be dropped at Domain 1. Host 1 Domain 1 1 2 3 Domain 3 6 8 7 Target 4 Host 2 2 1 Domain 2 FIGURE 37 Illegal ETIZ configuration: two paths from one port = ETIZ 1 = ETIZ 2 Traffic Isolation Zoning over FC routers This section describes how TI zones work with Fibre Channel routing (TI over FCR). See Chapter 24, "Using FC-FC Routing to Connect Fabrics," 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 38 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. 352 Fabric OS Administrator's Guide 53-1002745-02