Qlogic 12000 Series Reference Manual page 126

Switch Command Line Interface
Groups and Commands
Options:
linkWidth
1=1X, 2=4X, 3=1X/4X, 4=8X, 5=1X/8X, 6=4X/8X, 7=1X/4X/8X
-bounce
Brings the active links down and back up if a new value is set.
Sample Output:
-> ismChassisSetWidth
L101P01 link width supported: 4X
L101P02 link width supported: 4X
L101P03 link width supported: 4X
L101P04 link width supported: 4X
L101P05 link width supported: 4X
L101P06 link width supported: 4X
L101P07 link width supported: 4X
L101P08 link width supported: 4X
L101P09 link width supported: 4X
L101P10 link width supported: 4X
L101P11 link width supported: 4X
L101P12 link width supported: 4X
L101P13 link width supported: 4X
L101P14 link width supported: 4X
L101P15 link width supported: 4X
L101P16 link width supported: 4X
....
NOTE:
ismIslSetWidth
View/Set/Unset chassis link width (except external ports).
Syntax:
ismIslSetWidth [linkWidth] [-bounce]
1-118
This command ONLY works on switches supporting 8X link
aggregation. This command sets link aggregation so that Internal
AND External switching will be at the specified width. Each 8X port
is 2 aggregated 4X ports (i.e. a DUO), where one will be reported as
a 8X port, and the other port is reported as disabled. Each of the two
aggregated 4X ports must be connected to another enabled 8X Duo
to establish an 8X link. To force links to only operate at 8X, use the
'8X' option. Calling this function without a parameter will display the
ports' current values.
Calling this function with the [-bounce] option disruptively brings
active links down and back up so the links use the new setting
immediately. Otherwise the new setting will be used the next time
links retrain.
D000103-000 E