Cabletron Systems 6A000-ZX-250 User Manual
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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.

SERVER SVC

X X

Operators

modify, show

Parameters

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

0-12

0

 

VPI, for each of the four mask indexes.

 

 

[VciShift]

Current number of bits assigned for use by the

0-12

12

 

VCI, for each of the four mask indexes.

 

 

Descriptions

Operator

Parameters/Permissions

Description

 

 

 

modify [MaskIndex] <maskindex>

vccmask [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.

2-204SmartCell6A000/ZX-250Reference Manual

Console Commands

Operator

Parameters/Permissions

Description

 

 

 

show

All

Displays the four VPI/VCI sets currently defined in the

vccmask

 

system as VCC masks.

Examples

switch_prompt # modify vccmask

MaskIndex(0)

: 0

VPIShift(0)

:

3

VCIShift(12)

:

9

switch_prompt

#

 

switch_prompt

# show vccmask

MaskIndex VpiShift

VciShift

(In bits)

(In bits)

===========================================================================

0

0

12

1

2

10

2

4

8

3

6

6

switch_prompt #

SmartCell 6A000/ZX-250Reference Manual2-205