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Getting Started with Passport 4400, Release 4.1
Appendix A
IfIndexes and Interface Identification
The following topics are discussed in this chapter.
•“IfIndex Overview” on page 57
•“Hard-Coded IfIndexes” on page 58
•“Reserved IfIndexes and Ranges” on page 58
•“IfIndex Table Display Definitions” on page 62
IfIndex Overview
Each physical and virtual interface on the Passport 4460 is assigned an IfIndex, a
unique identifier that allows SNMP to read and write status information. These
IfIndexes are used to establish logical links between interfaces and higher-level
applications and protocol stacks.
The Passport 4460 can support up to 255 IfIndexes. Some of these are hard-coded
and cannot be changed; others are automatically reserved by the Passport 4460
operating system when the unit is powered on.
For more information on IfIndexes, proceed to the the following:
•“Hard-Coded IfIndexes” on page 58
•“Reserved IfIndexes and Ranges” on page 58
•“IfIndex Table Display Description” on page 60