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20 November 2003 8000-A2-GB30-10
4.1.1.1.1 Interface indexes (ifIndex).
A unique value, greater than zero number will be assigned to each interface. The following
ifIndex scheme was developed by a committee to solve a general stack hierarchy and it is
shown in Figure 1-2:
Figure 1-2. ifIndex Scheme
Where:
- RR: Reserved for future use.
- CC: Chassis number from 1..99. For the GranDSLAM R3.2, this value will
always be 1, identifying the 8820 or the 8620 chassis.
- SS: Slot number from 1..99. For the GranDSLAM R3.2, this value will range
from 1 through 20.
- Slot 00 will have a special meaning on the GranDSLAM 3.0. Slot 00 will be used
for the interfaces contained in the SCP cards.
- L: Layer number associated in the interface stack in Table 1-7, Interface Stack.
- PPP: Port/Interface number from 1..999.
The value 0 will be used as a special case in any of the above fields to denote N/A.
The following table shows the assigned ifIndexes to be used for the GranDSLAM R3.2
product. In the table, the DSL ports are enumerated from 1-48, with the Layer field set to 1.
The product will support 2 DSL Channels (Interleave, Fast) per DSL ports, that make a total
of 96 channels numbered from 1-96 with the Layer field set to 2. Similarly, their
corresponding DSL ATM links will be numbered from 1-96, but with the Layer field set
to 3. In the case of the WAN ports, the number starts at 901 for the first T1/E1or OC3 link
and increments up to the max number of WAN ports supported. When some of these DS1
are aggregated to form an IMA Group, the first IMA group starts at 910, but with the Layer
field set to 4. Similarly, the ATM links associated with the DS1 port will carry the same
starting number as the physical interface but with the Layer Field set to 3, which
corresponds to the ATM layer in Table 1-7, Interface Stack. Finally, other ports dedicated to
management of the device such as Ethernet ports and async ports will have ifIndexes
starting at 801 for the first port, and so on.
The suffix ‘cc’ indicates the chassis number where the interface is instantiated. The chassis
number for the 8820 or the 8620 will be 1 for the GranDSLAM R3.2.
The suffix ‘ss’ indicates the slot number where the interface is instantiated. For the
GranDSLAM R3.2, this number corresponds to the physical position where the associated
module is located in the 8820 or 8620 chassis.
For the GranDSLAM R3.2, the value ss=’00’ have a special meaning. A logical slot
number of 00 will be used for those interfaces contained and accessible in the SCP cards.
Therefore, these interfaces will be independent and remain contant regardless of which
SCP is in charge. However, the internal software may require that the corresponding slot
based ifIndexes in the SCP be also supported.
PPPLSSCCRR