Q-Logic 16HA Manuel D’Utilisation
Preliminar
y
Multistage Topology
SANbox-16HA Fibre Channel Switch
5-12
Multi-Chassis Fabrics
59005-03 Rev. A
Installer’s/User’s Manual
Multistage Topology
A Multistage Switch consists of chassis configured in two different Stage Types, an
Input-Output/Transfer (IO/T) stage type, and a Cross-Connect (CC) Stage Type.
Two or more chassis with the IO/T Stage Type supply user ports to connect to the
users, and T_Ports that connect to one or more chassis with the CC Stage Type. The
chassis with the CC Stage Type supply interconnections for the T_Ports. Any
SANbox chassis can function as an IO/T Stage Type or as a CC Stage Type. Switch
management allows you to designate the Stage Type of any chassis as IO/T or CC.
The default Stage Type for any chassis is IO/T.
Input-Output/Transfer (IO/T) stage type, and a Cross-Connect (CC) Stage Type.
Two or more chassis with the IO/T Stage Type supply user ports to connect to the
users, and T_Ports that connect to one or more chassis with the CC Stage Type. The
chassis with the CC Stage Type supply interconnections for the T_Ports. Any
SANbox chassis can function as an IO/T Stage Type or as a CC Stage Type. Switch
management allows you to designate the Stage Type of any chassis as IO/T or CC.
The default Stage Type for any chassis is IO/T.
T_Port Rules for SANbox IO/T Chassis
Any port on a SANbox-8 or 16 IO/T chassis may be a T_Port. T_Ports are used to
interconnect chassis and are not user ports. QLogic suggests that you not use more
than half of the ports on a chassis as T_Ports. Chassis numbers must be unique
among all IO/T chassis in a fabric. If there is a chassis number conflict, the switch
with the higher world wide name will be disabled. In addition, a Logged-In LED
on the switch with the lower world wide name will blink to indicate which port is
connected to the conflicting switch.
interconnect chassis and are not user ports. QLogic suggests that you not use more
than half of the ports on a chassis as T_Ports. Chassis numbers must be unique
among all IO/T chassis in a fabric. If there is a chassis number conflict, the switch
with the higher world wide name will be disabled. In addition, a Logged-In LED
on the switch with the lower world wide name will blink to indicate which port is
connected to the conflicting switch.
You must connect at least one T_Port on each IO/T chassis to each CC chassis.
T_Port Rules for SANbox Cross-Connect (CC) Chassis
All ports on a SANbox CC chassis are T_Ports. As T_Ports they are used to inter-
connect chassis and are not user ports. Chassis numbers must be unique among all
CC chassis in a fabric. If there is a chassis number conflict, the switch with the
higher world wide name will be disabled. In addition, a Logged-In LED on the
switch with the lower world wide name will blink to indicate which port is
connected to the conflicting switch. Each CC chassis must have at least one T_Port
connection from each IO/T chassis.
connect chassis and are not user ports. Chassis numbers must be unique among all
CC chassis in a fabric. If there is a chassis number conflict, the switch with the
higher world wide name will be disabled. In addition, a Logged-In LED on the
switch with the lower world wide name will blink to indicate which port is
connected to the conflicting switch. Each CC chassis must have at least one T_Port
connection from each IO/T chassis.
Multistage Fabric Size
SANbox-16 chassis connected in Multistage topology (All SANbox-16 chassis)
expand from three chassis to a maximum of 17 to 24 chassis (16 IO/T chassis and
one to eight CC chassis). This results in 128 to 240 user ports depending on the
number of T_Ports used to interconnect the chassis.
expand from three chassis to a maximum of 17 to 24 chassis (16 IO/T chassis and
one to eight CC chassis). This results in 128 to 240 user ports depending on the
number of T_Ports used to interconnect the chassis.
Multistage Latency
Latency between any two user ports on different chassis is three chassis hops
(counting the source and destination chassis).
(counting the source and destination chassis).