Cisco Cisco IOS Software Release 12.4(15)T

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With the OSPFv2 Local RIB feature, each OSPF protocol instance has its own local Routing Information 
Base (RIB). The OSPF local RIB serves as the primary state for OSPF SPF route computation. The 
global RIB is not updated with intermediate results during the SPF. Instead, the global RIB is updated 
only when routes are added, deleted, or changed, thereby reducing global RIB computation. This 
reduced update activity may result in fewer dropped packets. 

This feature is enabled by default and does not need to be configured. This document describes some 
optional configuration tasks to modify how the global and local RIBs function, although it is 
recommended to keep the default settings.

Your Cisco IOS software release may not support all of the features documented in this module. To reach 
links to specific feature documentation in this module and to see a list of the releases in which each feature is 
supported, use the 

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS 
software image support. To access Cisco Feature Navigator, go to 

. An 

account on Cisco.com is not required.