Sample Topology (Physical Topology) - HP A7533A - Brocade 4Gb SAN Switch Base Administrator's Manual

connected from that router to the edge fabric. Another FC router connected to the same edge fabric
projects a different front phantom domain.
The second level of phantom domains is known as a translate phantom domain, also referred to as
translate domain or xlate domain. The translate phantom domain is a router virtual domain that represents
an entire fabric. Device connectivity can be achieved from one fabric to another—over the backbone or
edge fabric through this virtual domain—without merging the two fabrics. The EX_Ports present translate
phantom domains in edge fabrics as being topologically behind the front domains; if the translate
phantom domain is in a backbone fabric, it is topologically present behind the FC router because there is
no front domain in a backbone fabric.
If an FC router is attached to an edge fabric using an EX_Port, it creates xlate domains in the fabric
corresponding to the imported edge fabrics with active LSANs defined. If you import devices into the
backbone fabric, an xlate domain is created in the backbone device in addition to the one in the edge
fabric.
Figure 63 shows a sample physical topology. This figure shows four FC routers in a backbone fabric and
four edge fabrics connected to the FC routers.
Host
Fabric 1
E
E
E
EX
EX
FC router 1
Figure 63

Sample topology (physical topology)

Figure 64 on page 374 shows a phantom topology for the physical topology shown in
figure, the dashed lines and shapes represent the phantom topology from the perspective of Fabric 1.
Fabrics 2 and 3 also see phantom topologies, but they are not shown in this example. In this figure, note
the following:
• Front domain 1 and Front domain 2 are front domains for EX_Ports connecting to Fabric 1. There is one
front domain for each FC router that is connected to Fabric 1.
• Xlate domain 1 and Xlate domain 2 represent Fabrics 2 and 3, respectively. No xlate domain is
created for Fabric 4 because there are no LSAN devices in Fabric 4.
• Target 1', Target 2', and Target 3' are proxy devices for Target 1, Target 2, and Target 3, respectively.
Target 1 Target 2
Fabric 2
E
EX
EX
EX
FC router 2 FC router 3
Target 3
Fabric 3 Fabric 4
E
E
E
EX
EX
FC router 4
Fabric OS 6.2 administrator guide 373
Figure 63. In this