Specifications
IP Switching Commands
show ip cef
ISW-155
Cisco IOS IP Switching Command Reference
May 2008
The following is sample output from the show ip cef detail command for Ethernet interface 0. It shows
all the prefixes resolving through adjacency pointing to next hop Ethernet interface 0/0 and next hop
interface IP address 172.19.233.33.
Router# show ip cef e0/0 172.19.233.33 detail
IP Distributed CEF with switching (Table Version 136808)
45800 routes, 8 unresolved routes (0 old, 8 new) 45800 leaves, 2868 nodes, 8444360 bytes,
136808 inserts, 91008 invalidations 1 load sharing elements, 208 bytes, 1 references 1 CEF
resets, 1 revisions of existing leaves refcounts: 527343 leaf, 465638 node
172.19.233.33/32, version 7417, cached adjacency 172.19.233.33 0 packets, 0 bytes,
Adjacency-prefix
Ta b l e 23 show ip cef summary Field Descriptions
Field Description
routes Total number of entries in the Cisco Express Forwarding table.
unresolved routes Number of entries in the Cisco Express Forwarding table that do not
have resolved recursions categorized by old and new routes.
peak Highest number of unresolved recursions.
load sharing elements, bytes,
references
Information about load sharing elements: how many, number of
associated bytes, and number of associated references.
load sharing algorithm, id Type of load sharing, whether the router is configured for per
destination or per packet and the identifier.
leaves, nodes, bytes Number of elements in the Cisco Express Forwarding table and how
much memory they use.
Table epoch Number indicating the version of a Cisco Express Forwarding table
from 0 to 255.
Slot Slot number in which an E2 or ISE line card is installed.
Hw Resource Name Internal name of each hardware resource used by Cisco Express
Forwarding:
• E2: Cisco 12000 series Engine 2 line card
• E3: Cisco 12000 series ISE line card
• Rx: Received by the router
• Tx: Transmitted by the router
• PLU: Pointer lookup memory
• TLU: Table lookup memory
Util Percentage of the resource used for Cisco Express Forwarding
fast-path forwarding.
Alert Operational status of the resource, based on utilization percentage:
• G: Green (Normal)—Less than the yellow threshold percentage is
used.
• Y: Yellow (Caution)—80 percent to 95 percent is used
(configurable).
• R: Red (Alarm)—95 percent or more is used.