Fabric OS Administrator's Guide v7.0.0 (53-1002148-02, June 2011)

278 Fabric OS Administrator’s Guide
53-1002148-02
Traffic Isolation Zoning over FC routers
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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.
FIGURE 42 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). See Chapter 23,
“Using the FC-FC Routing Service,” 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 43
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.
7
3
Domain 1 Domain 3
Domain 2
Host 1
1
6
4
= ETIZ 1
2
8
1
2
Host 2
Target
= ETIZ 2