Specifications

IP Switching Commands
ip cef table adjacency-prefix
ISW-41
Cisco IOS IP Switching Command Reference
May 2008
ip cef table adjacency-prefix
To modify how Cisco Express Forwarding (CEF) adjacency prefixes are managed, use the ip cef table
adjacency-prefix command in global configuration mode. To disable CEF adjacency prefix
management, use the no form of this command.
ip cef table adjacency-prefix [override | validate]
no ip cef table adjacency-prefix [override | validate]
Syntax Description
Defaults All CEF adjacency prefix management is disabled by default.
Command Modes Global configuration
Command History
Usage Guidelines When CEF is configured, the forwarding information base (FIB) table may conflict with static host
routes that are specified in terms of an output interface or created by a Layer 2 address resolution
protocols such as Address Resolution Protocol (ARP), map lists, and so on.
The Layer 2 address resolution protocol adds adjacencies to CEF, which in turn creates a corresponding
host route entry in the FIB table. This entry is called an adjacency prefix.
override
If the CEF adjacency prefix entries are also configured by a static host route, a conflict occurs.
This command ensures that adjacency prefixes can override static host glean routes, and correctly restore
routes when the adjacency prefix is deleted.
override Enables Cisco Express Forwarding (CEF) adjacency prefixes to override
static host glean routes.
validate Enables the periodic validation of Cisco Express Forwarding (CEF)
adjacency prefixes.
Release Modification
12.0(16)S This command was introduced.
12.2(2)T This command was integrated into Cisco IOS Release 12.2(2)T.
12.1(13)E07
12.1(19.02)E
12.3(04)XG
12.3(04)XK
12.3(06.01)PI03
The validate keyword was added.
The default behavior for ip cef table adjacency-prefix override was
changed to disabled.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train. Support
in a specific 12.2SX release of this train depends on your feature set,
platform, and platform hardware.