Specifications

IP Switching Commands
ipv6 cef
ISW-75
Cisco IOS IP Switching Command Reference
May 2008
ipv6 cef
To enable Cisco Express Forwarding for IPv6 (CEFv6), use the ipv6 cef command in global
configuration mode. To disable CEFv6, use the no form of this command.
ipv6 cef
no ipv6 cef
Syntax Description This command has no arguments or keywords.
Command Default CEFv6 is disabled by default.
Command Modes Global configuration
Command History
Usage Guidelines The ipv6 cef command is similar to the ip cef command, except that it is IPv6-specific.
The ipv6 cef command is not available on the Cisco 12000 series Internet routers because this distributed
platform operates only in distributed CEFv6 (dCEFv6) mode.
Note The ipv6 cef command is not supported in interface configuration mode.
Note Some distributed architecture platforms, such as the Cisco 7500 series routers, support both CEFv6 and
dCEFv6. When CEFv6 is configured on distributed platforms, CEF switching is performed by the Route
Processor (RP).
Note You must enable CEF for IPv4 (CEFv4) by using the ip cef global configuration command before
enabling CEFv6 by using the ipv6 cef global configuration command.
Release Modification
12.0(22)S This command was introduced.
12.2(13)T This command was integrated into Cisco IOS Release 12.2(13)T.
12.2(14)S This command was integrated into Cisco IOS Release 12.2(14)S.
12.2(28)SB This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(25)SG This command was integrated into Cisco IOS Release 12.2(25)SG.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2(33)SXH This command was integrated into Cisco IOS Release 12.2(33)SXH.