IPv6 HSRP configuration

I do not understand what this error message means.

ent1-dc1(config-if)#standby 1 ipv6 2001:201:15:3e8::/64 
%GigabitEthernet0/4: Warning: 2001:201:15:3E8::/64 is a Subnet Router Anycast

The IOS config guide says to use `# standby 1 ipv6 autoconfig`, which does it actually mean?

What's the advantage of using FE80::1 as HSRP ipv6 address?



IOS does allow me to use `standby ipv6 autoconfig` on one router and `standby ipv6 $global_unique_prefix` on another? Does it cause outage upon failover?


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