HP StorageWorks 4/256 Brocade Fabric OS Administrator's Guide v6.3.0 (53-10013 - Page 244
Logical fabric and ISL sharing, VE_Ports, or VEX_Ports, but no F_Ports.
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10 Logical fabric overview 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. Logical fabric and ISL sharing Another way to connect logical switches is using extended ISLs and base switches. When you divide a chassis into logical switches, you can designate one of the switches to be a base switch. A base switch is a special logical switch that is used for interconnecting the physical chassis. A base switch has the following properties: • ISLs connected through the base switch can be used for communication among the other logical switches. • For FC-FC routing, legacy EX_Ports must be connected to the base switch and no other logical switch. • Base switches do not support direct device connectivity. A base switch can have only E_Ports, VE_Ports, EX_Ports, or VEX_Ports, but no F_Ports. • The base switch provides a common address space for communication between different logical fabrics. • A base switch can be configured for the preferred domain ID just like a non-Virtual Fabrics switch. • You can have only one base switch in a physical chassis. A base switch can be connected to other base switches through a special ISL, called a shared ISL or extended ISL (XISL). An extended ISL is an ISL that connects base switches. The XISL is used to share traffic among different logical fabrics. Fabric formation is not based on connectivity, but is based on the FIDs of the logical switches. Figure 22 shows two physical chassis divided into logical switches. Each chassis has one base switch. An ISL connects the two base switches. This ISL is an extended ISL (XISL) because it connects base switches. Physical chassis 1 Logical switch 1 P1 (Default logical switch) Fabric ID 128 Logical switch 2 P2 Fabric ID 1 Physical chassis 2 P1 Logical switch 5 (Default logical switch) Fabric ID 128 P2 Logical switch 6 Fabric ID 1 P4 Logical switch 3 Fabric ID 15 P5 P6 Base switch Fabric ID 8 XISL P7 Logical switch 7 P6 Fabric ID 15 P8 P9 Base switch Fabric ID 8 FIGURE 22 Base switches connected by an XISL 202 Fabric OS Administrator's Guide 53-1001336-01
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