Cisco Systems EA6500 Manual De Usuario

This chapter describes how to configure the SNMP ifIndex persistence feature on Catalyst 6500 series 
switches. Release 12.1(13)E and later releases support SNMP ifIndex persistence.

This chapter consists of these sections:

The SNMP ifIndex persistence feature provides an interface index (ifIndex) value that is retained and 
used when the switch reboots. The ifIndex value is a unique identifying number associated with a 
physical or logical interface. 

There is no requirement in the relevant RFCs that the correspondence between particular ifIndex values 
and their interfaces be maintained when the switch reboots, but many applications (for example, device 
inventory, billing, and fault detection) require maintenance of this correspondence.

You can poll the switch at regular intervals to correlate the interfaces to the ifIndexes, but it is not 
practical to poll constantly. The SNMP ifIndex persistence feature provides permanent ifIndex values, 
which eliminates the need to poll interfaces.

The following definitions are based on RFC 2233, “The Interfaces Group MIB using SMIv2.” The 
following terms are values in the Interfaces MIB (IF-MIB):

ifIndex —A unique number (greater than zero) that identifies each interface for SNMP 
identification of that interface.

ifName—The text-based name of the interface, for example, “ethernet 3/1.”

ifDescr—A description of the interface. Recommended information for this description includes the 
name of the manufacturer, the product name, and the version of the interface hardware and software.

These sections describe how to configure SNMP ifIndex persistence:

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