Why configure multiple ipv6 addresses on interface?

[_|brt.drml|_]

I'm preparing for CCNP Encor and I was reading about the interface commands to add a secondary IPV4 address and multiple IPv6 address.

I do not think any use for IPv4, but could be mistaken. 

How about IPv6? 

Do you create a router on a stick? 

Is there any use in creating multiple IPv6 addresses on one interface?

Thank you for helping me understand this matter.

Bart

[balaji.bandi]

Both IPv4 and IPV6 - it all depends on the requirement, most use case is no interface available, as you mentioned router is in a stick.

[Xavier Bonfond]

on servers, it can be used to link each services on separate IPv6.

on a router and all devices, it can be useful in case of a prefix change where you can have a transition phase with devices with IPv6 in multiple prefix.