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Fabric OS Administrator’s Guide 289
53-1002745-02
Limitations and restrictions of Virtual Fabrics
10
Refer to “Supported port configurations in Brocade Backbones” on page 287 for restrictions on the
default logical switch.
Restrictions on XISLs
The Allow XISL Use option under the configure command, allows a logical switch to use XISLs in the
base switch as well as any standard ISLs that are connected to that logical switch. To allow or
disallow XISL use for a logical switch, see “Configuring a logical switch to use XISLs” on page 299.
The following restrictions apply to XISL use. XISL use is not permitted in any of the following
scenarios:
• The logical switch has ICL ports.
• The logical switch is the default logical switch in the Brocade DCX, DCX-4S, or DCX 8510 family.
• The logical switch is a base switch.
• The logical switch is an edge switch for an FC router.
In this case, if the logical switch is enabled, you cannot allow XISL use. If the logical switch is
disabled or has not yet joined the edge fabric, you can allow XISL use; however, fabric
segmentation occurs when the logical switch is enabled or is connected to an edge fabric.
NOTE
Using XISL and fmsmode at the same time is permitted, but this combination will only work in a
one-hop topology.
Restrictions on moving ports
The following are restrictions on moving ports among logical switches:
• FC ports cannot be moved if any one of the following features is enabled:
- Long distance
- QoS
- F_Port buffers
- F_Port trunking
• Before moving VE_Ports, you must remove the VE_Port tunnel configuration.
• VE_Ports on the FX8-24 blade can be moved to any logical switch independent of the location
of the physical GE port.
Brocade DCX 8510 family 8
Brocade 5300 4
Brocade 5100 3
Brocade 6510 4
Brocade 6520 4
Brocade 7800 4
Brocade VA-40FC 3
TABLE 52 Maximum number of logical switches per chassis (Continued)
Platform Maximum number of logical switches