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Catalyst 4500 Series Switch, Cisco IOS Software Configuration Guide - Cisco IOS XE 3.9.xE and IOS 15.2(5)Ex
 
Chapter 63      Support for IPv6
IPv6 Default States
IPv6 Default States
Table 63-1 shows the default states of IPv6 configuration.
Table 63-1 Default IPv6 Configuration
Feature Default Setting
IPv6 routing Disabled globally and on all interfaces
CEFv6 or dCEFv6 Disabled (IPv4 CEF and dCEF are enabled by default)
Note When IPv6 routing is enabled, CEFv6 and dCEF6 are automatically 
enabled.
IPv6 addresses None configured