Cisco 7604 User Manual

CHAPTER
53-1
Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
53
Configuring SNMP IfIndex Persistence
This chapter describes how to configure the SNMP ifIndex persistence feature on Cisco 7600 series
routers.
Note For complete syntax and usage information for the commands used in this chapter, refer to the Cisco IOS
Master Command List, Release 12.2SX at this URL:
http://www.cisco.com/en/US/docs/ios/mcl/122sxmcl/12_2sx_mcl_book.html
This chapter consists of these sections:
• Understanding SNMP IfIndex Persistence, page 53-1
• Configuring SNMP IfIndex Persistence, page 53-2
Tip For additional information (including configuration examples and troubleshooting information), see the
documents listed on this page:
http://www.cisco.com/en/US/products/hw/routers/ps368/tsd_products_support_series_home.html
Understanding SNMP IfIndex Persistence
The SNMP ifIndex persistence feature provides an interface index (ifIndex) value that is retained and
used when the router 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 router reboots, but many applications (for example, device
inventory, billing, and fault detection) require maintenance of this correspondence.
You can poll the router 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.

Cisco 7604 Specifications

General

Brand	Cisco
Model	7604
Category	Network Router
Language	English