HP StorageWorks 8/8 Brocade Fabric OS Administrator's Guide v6.3.0 (53-1001336 - Page 245
they are con d to do so; you can change this setting, however
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Logical fabric overview 10 Traffic between the logical switches can now flow across this XISL. The traffic can flow only between logical switches with the same fabric ID. For example, traffic can flow between Logical Switch 2 in chassis 1 and Logical switch 6 in chassis 2, because they both have fabric ID 1. Traffic cannot flow between Logical switch 2 and Logical switch 7, because they have different fabric IDs (and are thus in different fabrics). Think of the logical switches as being connected with logical ISLs, as shown in Figure 23. In this diagram, the logical ISLs are not connected to ports because they are not physical cables. They are just a logical representation of the switch connections that are allowed by the XISL. Physical chassis 1 Logical switch 1 P1 (Default logical switch) Fabric ID 128 P2 Logical switch 2 Fabric ID 1 Logical switch 3 Fabric ID 15 P5 P6 Base switch Fabric ID 8 Logical ISL Logical ISL Logical ISL XISL Physical chassis 2 P1 Logical switch 5 (Default logical switch) Fabric ID 128 P2 Logical switch 6 Fabric ID 1 P4 P7 Logical switch 7 P6 Fabric ID 15 P8 P9 Base switch Fabric ID 8 FIGURE 23 Logical ISLs connecting logical switches To be able to use the XISL, the logical switches must be configured to allow XISL use. By default, they are configured to do so; you can change this setting, however, using the procedure described in "Configuring a logical switch to use XISLs" on page 218. NOTE The default logical switch in the Brocade DCX or DCX-4S cannot use XISLs. You can also connect logical switches using a combination of ISLs and XISLs, as shown in Figure 24 on page 204. In this diagram, traffic between the logical switches in fabric 1 can travel over either the ISL or the XISL. Traffic between the other logical switches travels only over the XISL. Fabric OS Administrator's Guide 203 53-1001336-01
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