Dell PowerConnect Brocade 300 Fabric OS Administrator's Guide v7.1.0 - Page 282
Logical fabric and ISLs,
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10 Logical fabric overview Logical fabric and ISLs Figure 23 shows two physical chassis divided into logical switches. In Figure 23, ISLs are used to connect the logical switches with FID 1 and the logical switches with FID 15. The logical switches with FID 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 FID 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 Switch P8 Logical switch 8 P9 Fabric ID 8 FIGURE 23 Logical switches connected to other logical switches through physical ISLs Figure 24 shows a logical representation of the configuration in Figure 23. Fabric 128 SW1 SW5 Fabric 15 SW3 SW7 Fabric 1 SW2 SW6 SW4 Fabric 8 SW8 FIGURE 24 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 23, 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. NOTE Only logical switches with the same FID can form a fabric. If you connect two logical switches with different FIDs, the link between the switches segments. 282 Fabric OS Administrator's Guide 53-1002745-02
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