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Description of problem:
PowerVS support for cloud-init requires that a ipv6 interface (with link local address) is up and running. A IPV6 interface with link local address needs ipv6_autoconf=no, but currently cloud-init does not support this configuration (the default value is yes and this causes ipv6 address fluctuations). An example of the network configuration that is expected is as listed below:

> BOOTPROTO=none
> DEVICE=env6
> HWADDR=5e:fa:03:be:50:51
> IPV6INIT=yes
> ONBOOT=yes
> STARTMODE=auto
> TYPE=Ethernet
> USERCTL=no
> IPV6_AUTOCONF=no


Version-Release number of selected component (if applicable):
cloud-init-20.3

upstream pull-request https://github.com/canonical/cloud-init/pull/634

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (cloud-init bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2021:1827