Reference Guide

Logical fabric overview
A logical fabric is a fabric that contains at least one logical switch.
The four fabrics shown in Figure 21 on page 272 and Figure 22 on page 273 are logical fabrics because they each have at least one
logical switch.
You can connect logical switches to non-Virtual Fabrics switches and to other logical switches.You connect logical switches to non-
Virtual Fabrics switches using an ISL, as shown in Figure 21 on page 272.
You connect logical switches to other logical switches in two ways:
∙ Using ISLs
∙ Using base switches and extended ISLs (XISLs)
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.
FIGURE 23 Logical switches connected to other logical switches through physical ISLs
Managing Virtual Fabrics
Brocade Fabric OS Administration Guide, 8.0.1
274 53-1004111-02