[c-nsp] v6 vrrp

[Doug McIntyre]

On Sat, Jul 09, 2022 at 01:44:28PM -0700, Randy Bush wrote:
> now to make the matching junos.  for a junos facing an xr, i
> did not have to do this link local stuff.

The standard states that the first address in VRRP v3 IPv6 needs to be
an IPv6 link-local address.
https://datatracker.ietf.org/doc/html/rfc5798

> In the IPv6 case (that is, IPvX is IPv6 everywhere in the figure),
> each router has a link-local IPv6 address on the LAN interface (Rtr1
> is assigned IPv6 Link-Local A and Rtr2 is assigned IPv6 Link-
> Local B), and each host learns a default route from Router
> Advertisements through one of the routers (in this example, they all
> use Rtr1's IPv6 Link-Local A).

Due to RA. 

Some vendors force or interpret the standard different than others.