Brocade Fabric OS Administrators Guide (Supporting Fabric OS v7.3.0) - Manual (Page 284)

Maximum number of logical switches per chassis (Continued) TABLE 61
Platform Maximum number of logical switches
Brocade 6520 4
Brocade 7800 4
Brocade 7840 4
Brocade VA-40FC 3
Refer to Supported port configurations in Brocade Backbones on page 281 for restrictions on the
default logical switch.
If a blade slot is being decommissioned and has ports configured in logical switches, it is
recommended that the logical port assignments be removed from that blade before removing the
blade. This ensures a seamless transition for any new port or AP blade that might occupy that slot in
the future. This does not apply if you are simply replacing a blade of the same type.
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 for XISL use on page 293.
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.
Restrictions on XISLs
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