Cabletron Systems 6A000/ZX-250 - Manual (Page 228)

2-204 SmartCell 6A000/ZX-250 Reference Manual
Console Commands
VCCMask
Use VCCMask (virtual channel connection mask) to manage the combination of VPI (virtual path identifier) bit and
VCI (virtual channel identifier) bit settings. There are only four different VCC mask entries allowed by the switch and
the VPI and VCI shift must total 12.
Operators
modify, show
Parameters
Descriptions
SERVER SVC
X X
Input Parameter Description Value/Field Size Default
[MaskIndex] Index of mask to be changed. 0-3 0
[VpiShift] Current number of bits assigned for use by the
VPI, for each of the four mask indexes. 0-12 0
[VciShift] Current number of bits assigned for use by the
VCI, for each of the four mask indexes. 0-12 12
Operator Parameters/Permissions Description
modify
vccmask
[MaskIndex] <maskindex>
[VpiShift] <vpishift>
[VciShift] <vcishift>
Administrator
Modifies the proportion of bits assigned to the VPI and VCI
for a given VCC or VPI/VCI set. The combined total of VPI
and VCI bits must equal 12. The four most common VCC
masks are predefined in the system (see
modify portconfig
). When modifying a VPI/VCI set, you must specify the VCC
mask by using the mask index identifier. If you modify a
specific mask index, for example a VPI/VCI set is modified
from 6/6 to 7/5, you will modify occurrences of the 6/6
configuration on all ports, as only four different VCC masks
configurations can exist at any one time.