HP 8/40 Brocade Fabric OS Administrator's Guide v6.3.0 (53-1001336-01, July 20 - Page 243
Logical fabric and ISLs,
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Logical fabric overview 10 You connect logical switches to other logical switches in two ways: • Using ISLs • Using base switches and shared ISLs Logical fabric and ISLs Figure 20 shows two physical chassis divided into logical switches. In Figure 20, ISLs are used to connect the logical switches with fabric ID 1 and the logical switches with fabric ID 15. The logical switches with fabric ID 8 are each connected to a non-Virtual Fabrics switch. The two logical switches and the non-Virtual Fabrics switch are all in the same fabric, with fabric ID 8. Physical chassis 1 Logical switch 1 P1 (Default logical switch) Fabric ID 128 Logical switch 2 P2 Fabric ID 1 P3 P4 Logical switch 3 Fabric ID 15 P5 Physical chassis 2 P1 Logical switch 5 (Default logical switch) Fabric ID 128 P2 Logical switch 6 P3 Fabric ID 1 P4 P5 P7 Logical switch 7 P6 Fabric ID 15 Logical switch 4 P6 Fabric ID 8 P8 Logical switch 8 P9 Fabric ID 8 Switch FIGURE 20 Logical switches connected to other logical switches through physical ISLs Figure 21 shows a logical representation of the configuration in Figure 20. Fabric 128 Fabric 15 SW1 SW5 SW3 SW7 Fabric 1 Fabric 8 SW4 SW2 SW6 SW8 FIGURE 21 Logical switches connected to form logical fabrics The ISLs between the logical switches are dedicated ISLs because they carry traffic only for a single logical fabric. In Figure 20, Fabric 128 has two switches (the default logical switches), but they cannot communicate with each other because they have no ISLs between them and they cannot use the ISLs between the other logical switches. Fabric OS Administrator's Guide 201 53-1001336-01
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