Non-Zero Vpis; Values For Vpi And Vci - Cabletron Systems SmartCell 6A000 User Manual

Setting Up PVC Connections
Use to successively create point-to-multipoint PVCs for ports B2, B3, and C1.
3.
add pvc
SmartCell ZX # add pvc
ConnType(PTP)
LowPort(A1)
LowVPI(0)
LowVCI(33)
HighPort(A1)
HighVPI(0)
HighVCI(34)
FwdTrafficDescriptorIndex(1)
BkwTrafficDescriptorIndex(1)
SmartCell ZX #
Perform step 3 for ports B3 and C1.
Connect the workstations to their respective ports.
4.
Configure the workstations with the same subnet and VPI/VCI pair.
5.
The broadcasting workstation on port A1 can send traffic to the receiving workstations on ports B2, B3, and C1.
4.5.3

Non-zero VPIs

The SmartCell 6A000 uses 12 bits to define VPI/VCI pairs.
the VPI and how many are used for the VCI.
combinations. Table 4-1 shows the registers and the values that come preconfigured on the SmartCell 6A000.
Table 4-1
VCC Index VPI Bits
0 0
1 2
2 4
3 6
Use the command to view the four preconfigured VPI/VCI combinations.
show vccmask
SmartCell ZX # show vccmask
MaskIndex VpiShift
(In bits)
============================================================================
0 0
1 2
2 4
3 6
SmartCell ZX #
VCCMask combinations dictate what numerical values can be used for VPI/VCI pairs. Any VPI and VCI pairs that fit
the bit distribution of one of the indexed combinations can be used for defining a PVC. If the VPI and VCI values do
not fit one of the indexed combinations, the SmartCell 6A000 uses the closest matching indexed combination.
If you need to use values for VPI and VCI that do not fall within the range of one of the preconfigured indexed
combinations, use the
set vccmask
4-16 SmartCell 6A000 User Guide
: pmp <specify point-to-multipoint
: <port connected to broadcast workstation
:
: 100
: b2 <port connected to first receiver workstation
:
: 100
:
: 4 <Index of Traffic Descriptor with AALType = 0
vccmask

Values for VPI and VCI

VPI Values
0
0 to 3
0 to 15
0 to 63
VciShift
(In bits)
12
10
8
6
command to replace one of the preconfigured combinations.
determines how many of the 12 bits are used for
vccmask
uses a 2-bit register to hold four different VPI/VCI 12-bit
VCI Bits VCI Values
12 0 to 4095
10 0 to 1023
8 0 to 255
6 0 to 63
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