Cisco Cisco IOS Software Release 12.2(27)SBC

To enable Cisco Express Forwarding table consistency checker types and parameters, use the cef table 
consistency-check command in global configuration mode. To disable consistency checkers, use the no 
form of this command.

cef table consistency-check {ipv4 | ipv6} [type {lc-detect | scan-lc-rp | scan-rp-lc | scan-rib-ios 

| scan-ios-rib}] [count count-number] [period seconds] [error-message] [auto-repair delay 
seconds holddown seconds] [data-checking]

no cef table consistency-check {ipv4 | ipv6} [type {lc-detect | scan-lc-rp | scan-rp-lc | 

scan-rib-ios | scan-ios-rib}] [count count-number] [period seconds] [error-message] 
[auto-repair delay seconds holddown seconds] [data-checking]

Checks IPv4 addresses.

Checks IPv6 addresses.

On the Cisco 10000 series routers, IPv6 is supported on 12.2(28)SB 
and later releases.

(Optional) Specifies the type of consistency check to enable.

(Optional) (Distributed platforms such as the Cisco 7500 series only) 
Detects missing prefixes on the line card. The information is confirmed by 
the Route Switch Processor (RSP).

This consistency checker operates on the line card by retrieving IP prefixes 
that are missing from its Forwarding Information Base (FIB) table. If IP 
prefixes are missing, the line card cannot forward packets for these 
addresses. This consistency checker then sends IP prefixes to the RSP for 
confirmation. If the RSP detects that it has the relevant entry, an 
inconsistency is detected, and an error message is displayed. Finally, the 
RSP sends a signal back to the line card confirming that the IP prefix is an 
inconsistency.

(Optional) (Distributed platforms only) Performs a passive scan check of 
tables on the line card.

This consistency checker operates on the line card by examining the FIB 
table for a configurable time period and sending the next x prefixes to the 
RSP. The RSP does an exact lookup, and if it finds the prefix missing, it 
reports an inconsistency. Finally, the RSP sends a signal back to the line card 
for confirmation.

(Optional) Operates on the RSP (opposite of the scan-lc-rp consistency 
checker) by examining the FIB table for a configurable time period and 
sending the next x prefixes to the line card. 

The line card does an exact lookup. If it finds the prefix missing, the line card 
reports an inconsistency and signals the RSP for confirmation.

(Optional) (Distributed platforms only) Compares the Routing Information 
Base (RIB) to the FIB table and provides the number of entries missing from 
the FIB table.

(Optional) (Distributed platforms only) Compares the FIB table to the RIB 
and provides the number of entries missing from the RIB.