Q-Logic 16HA Manuel D’Utilisation

Multistage topology has the best bandwidth. All T_Ports from each IO/T chassis 
connect to all other IO/T chassis in the same number of chassis hops (three) no 
matter how large the fabric is. Thus the useful interconnection bandwidth from 
each IO/T chassis to any other IO/T chassis increases by 100MBs per T_Port. It is 
possible in Multistage topology to devote half of the chassis bandwidth to T_Ports 
thus providing as much as 800 MBytes per second bandwidth between any two IO/
T chassis.

You may locate the CC chassis in the center of a circle with a radius of the 
maximum cable length allowed by the selected GBICs and interconnection media.

Sanbox Switch chassis support fabric-wide zones for all zone types. Broadcast 
Zones and Name Server Zones require no special consideration in a Multistage 
fabric. That is, you may assign these zones by port or by device. T_Ports are not 
zoned.

Hard Zones, however, require zoned T_Port interconnections between chassis 
which contain ports in the same Hard Zone. That is, if a particular Hard Zone is 
distributed across chassis boundaries, each piece of that Hard Zone and its inter-
connecting T_Ports must be assigned to the same Hard Zone number. This makes 
interconnections between pieces of the same Hard Zone much like the interconnec-
tion of chassis.

SANbox switch fabrics support MKII chassis in Multistage topologies. The MKII 
switches should be used only as IO/T chassis, while the SANbox switches can be 
IO/T or cross-connect chassis. All chassis in a SANbox/MKII Multistage fabric 
support only one active T_Port between any two chassis, though more may be 
connected. Hard zoning and Name Server zoning by WWN are not supported in 
SANbox/MKII fabrics.

NOTE:
Also, remember that mixing of topologies is not allowed. If the topology of the 
chassis is Multistage, then the interconnection of the Hard Zones must also be 
accomplished in Multistage topology.