Brocade Fabric OS Administrator's Guide Supporting Fabric OS v6.3.0 (53-1001336-02, November 2009)

472 Fabric OS Administrator’s Guide
53-1001336-02
Fibre Channel routing concepts
21
• Inter-fabric link (IFL)
The link between an E_Port and EX_Port, or VE_Port and VEX_Port, is called an inter-fabric link
(IFL). You can configure multiple IFLs from an FC router to an edge fabric.
Figure 71 shows a metaSAN consisting of three edge fabrics connected through a Brocade
DCX with inter-fabric links.
FIGURE 71 A metaSAN with inter-fabric links
• Logical SANs (LSANs)
An LSAN is defined by zones in two or more edge or backbone fabrics that contain the same
devices. You can create LSANs that span fabrics. These LSANs enable Fibre Channel zones to
cross physical SAN boundaries without merging the fabrics while maintaining the access
controls of zones.
An LSAN device can be a physical device, meaning that it physically exists in the fabric, or it can
be a proxy device.
Figure 72 on page 473 shows a metaSAN with a backbone consisting of one FC router
connecting hosts in edge fabrics 1 and 3 with storage in edge fabric 2 and the backbone fabric
through the use of LSANs. Three LSAN zones allow device sharing between the backbone
fabric and Edge Fabric 1, between Edge Fabric 1 and Edge Fabric 2, and between Edge Fabric
2 and Edge Fabric 3.
Edge
fabric 2
Host Target
Target
Edge
fabric 1
Edge
fabric 3
Fibre
Channel
switch
E_Port
E_Port
E_Port
EX_Ports
IFL
IFL
FC router
Long distance IFL
Fibre
Channel
switch