Cisco Cisco IOS Software Release 12.0(11)S
Interface Index Persistence
Feature Overview
2
Cisco IOS Release 12.0(11)S
Benefits
Association of Interfaces with Traffic Targets for Network Management
The IfIndex Persistence feature allows for greater accuracy when collecting and processing network
management data by uniquely identifying input and output interfaces for traffic flows and SNMP
statistics. By relating each interface to a known entity (such as a ISP customer), network management
data can be more effectively utilized.
management data by uniquely identifying input and output interfaces for traffic flows and SNMP
statistics. By relating each interface to a known entity (such as a ISP customer), network management
data can be more effectively utilized.
Accuracy for Mediation, Fault Detection, and Billing
With the international growth and reliance of network data being used for usage-based billing, network
planning, policy enforcement, and trending analysis, it becomes increasingly important to be extremely
accurate when collecting and processing network management data. The ifIndex information is used to
identify input and output interfaces for traffic flows and SNMP statistics. Not being able to reliably
relate each interface to a known entity such as a customer invalidates the data.
planning, policy enforcement, and trending analysis, it becomes increasingly important to be extremely
accurate when collecting and processing network management data. The ifIndex information is used to
identify input and output interfaces for traffic flows and SNMP statistics. Not being able to reliably
relate each interface to a known entity such as a customer invalidates the data.
Restrictions
The interface-specific ifIndex persistence command ([no] snmp ifindex persistence) can not be used
on subinterfaces. A command applied to an interface is automatically applied to all the subinterfaces
associated with that interface.
on subinterfaces. A command applied to an interface is automatically applied to all the subinterfaces
associated with that interface.
Testing indicates approximately 25 bytes of NVRAM storage is used by this feature per interface.
There
may be some boot delay on platforms with lower CPU speeds.
Related Features and Technologies
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SNMP (Simple Network Management Protocol)
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RMON (Remote Monitoring)
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Expression MIB
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Event MIB
Related Documents
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The “Configuring SNMP Support” chapter of the Cisco IOS Configuration Fundamentals
Configuration Guide, Release 12.1 (available on CCO)
Configuration Guide, Release 12.1 (available on CCO)
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The “SNMP Commands” chapter of the Cisco IOS Configuration Fundamentals Command
Reference, Release 12.1 (available on CCO)
Reference, Release 12.1 (available on CCO)
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“Ethernet-like Interfaces MIB and Interfaces Group MIB Enhancements” Feature Module,
Cisco IOS Release 12.1(2)T (available on CCO).
Cisco IOS Release 12.1(2)T (available on CCO).
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RFC 2233, “The Interfaces Group MIB using SMIv2”
RFCs are available from a variety of internet sources. The primary source is the IETF’s web site at
http://www.ietf.org
http://www.ietf.org