IPv6 addressing and unicast routing are disable by default on Cisco switches, all those features has to be enabled before we can configure them.
Here is default IPv6 configuration:
Feature
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Default Setting
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SDM template
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Advance desktop. Default is advanced template
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IPv6 routing
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Disabled globally and on all interfaces
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CEFv6 or dCEFv6
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Disabled (IPv4 CEF and dCEF are enabled by default)
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IPv6 addresses
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None configured
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No, SDM is not Security Device Manager, this actually stand for Switch Database Manager.
SDM templates are used to configure system resources in the switch to optimize support for specific features and to balance resources, in this case we are going to use for IPv6. For more details about SDM template go to: Cisco doc about SDM Template
