Cisco Cisco IOS Software Release 12.0(21)S

This feature module describes the enhancement of the Interfaces Group MIB for subinterfaces and 
RFC 2233 compliance for Cisco’s implementation of the IF-MIB in Cisco IOS Software 
Release 12.1(2)T and 12.0(21)S3. This document includes the following sections:

Please see the Glossary for definitions of any unfamiliar terms or acronyms.

This feature module documents enhancements made to the Interfaces Group MIB module (IF-MIB) in 
Cisco IOS Release 12.1(2)T and 12.0(21)S3. These MIB enhancements bring the IF-MIB into 
compliance with RFC 2233 and provide SNMP support for subinterfaces. Additionally, you can now 
configure SNMP to use either the existing Cisco implementation of linkUp / linkDown traps or the new 
implementation consistent with Internet Engineering Task Force (IETF) standards. This configuration 
is achieved through the use of a new Cisco IOS CLI command.