NOTE: CEF switching is enabled by default on the following platforms:
??? Cisco 7100 series router
??? Cisco 7200 series router
??? Cisco 7500 series Internet router
dCEF Switching is enabled by default on the following platforms:
??? Cisco 6500 series router
??? Cisco 12000 series Internet router
Router(config)#iipp cceeff Enables standard CEF
Router(config)#iipp cceeff ddiissttribbuutteedd Enables dCEF
Router(config)#nnoo iipp cceeff Disables CEF globally
Router(config)#interface faasstethernet 0/1 Moves to interface
con?¬?guration mode
Router(config-if)#iipp rroouuttee--ccaacche cceeff Enables CEF on the
interface
24 Con?¬?guring Cisco Express Forwarding
Verifying CEF
NOTE: CEF is not supported on logical interfaces, such as loopback interfaces.
Troubleshooting CEF
Router#sshhooww iipp cceeff Displays entries in the
forwarding information
base (FIB)
Router#sshhooww iipp cceeff ssuummmmaarryy Displays a summary of the
FIB
Router#sshhooww iipp cceeff uunnrreessoollvveedd Displays unresolved FIB
entries
Router#sshhooww iipp cceeff ffaasstteetthheerrnneett 00//11 Displays the FIB entry for
the speci?¬?ed interface
Router#sshhooww iipp cceeff ffaasstteetthheerrnneett 00//11 ddeettaaiill Displays detailed
information about the FIB
for the interface
Router#sshhooww cceeff ddrroopp Displays packets that are
dropped due to adjacencies
that are incomplete or
nonexistent
Router#ddeebbuugg iipp cceeff Displays debug
information for CEF
Router#ddeebbuugg iipp cceeff ddrroopp Displays debug information
about dropped packets
Router#ddeebbuugg iipp cceeff aacccceessss--lliisstt x Displays information from
speci?¬?ed access lists
Router#ddeebbuugg iipp cceeff rreecceeiivvee Displays information
about packets received
by IP CEF
Con?¬?guring MPLS on a Frame Mode Interface 25
Con?¬?guring MPLS on a Frame Mode Interface
Router#ddeebbuugg iipp cceeff eevveennttss Displays general CEF
events
Router#ddeebbuugg iipp cceeff pprreeffiixx--iippcc Displays updates related
to IP pre?¬?x information
Router#ddeebbuugg iipp cceeff ttaabbllee Produces a table showing
events related to the FIB
table
Router(config)#mmppllss iipp Enables MPLS globally
on the router
NOTE: MPLS is
enabled by default on
Cisco routers.
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