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Cisco: Change IPV6 SLAAC lifetimes

The default IPV6 valid lifetime for a SLAAC configured address is 30 days, and preferred lifetime is 7 days. You can change these lifetimes with this command:

conf t
int vlan 568
ipv6 nd prefix default 86400 14400

This can be used to effectively "time-out" an auto-configured address.

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