Specifications

IP Switching Commands
ip cef table consistency-check
ISW-45
Cisco IOS IP Switching Command Reference
May 2008
Usage Guidelines This command configures Cisco Express Forwarding table consistency checkers and parameters for the
detection mechanism types that are listed in
Table 8:
Examples The following example shows how to enable the CEF consistency checkers:
Router(config)# ip cef table consistency-check
12.2(14)SX Support for this command was implemented on the Supervisor Engine 720.
12.2(17d)SXB Support for this command on the Supervisor Engine 2 was integrated into
Release
12.2(17d)SXB.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
Release Modification
Ta b l e 8 CEF Detection Mechanism Types
Detection Mechanism Where Operates Description
lc-detect Line Card or
Module
Operates on the line card or module detecting and
retrieving IP prefixes that are missing from its FIB table.
If IP prefixes are missing, the line card or module cannot
forward packets for these addresses. The lc-detect
mechanism sends IP prefixes to the RP or rendezvous
point for confirmation. If the RP or rendezvous point
detects that it has the relevant entry, an inconsistency is
identified and an error message is displayed. Also, the
RP or rendezvous point sends a signal back to the line
card or module confirming that the IP prefix is an
inconsistency.
scan-lc Line Card or
Module
Operates on the line card or module by looking through
the FIB table for a configurable time period and sending
the next n prefixes to the RP or rendezvous point. The RP
or rendezvous point performs an exact lookup. If it finds
the prefix missing, the RP or rendezvous point reports an
inconsistency. Finally, the RP or rendezvous point sends
a signal back to the line card or module for confirmation.
scan-rp Route Processor Operates on the RP or rendezvous point (opposite of the
scan-lc) by looking through the FIB table for a
configurable time period and sending the next n prefixes
to the line card or module. The line card or module
performs an exact lookup. If it finds the prefix missing,
the line card or module reports an inconsistency and
finally signals the RP or rendezvous point for
confirmation.
scan-rib Route Processor Operates on all RPs or rendezvous points (even
nondistributed) and scans the RIB to ensure that prefix
entries are present in the RP or rendezvous point FIB
table.