[c-nsp] v6 vrrp

[Saku Ytti]

Junos automatically assigns LL as 1st. IOS-XR can be made to do this
auto-assign, and will use the same policy to generate it.

SROS validates that the set of virtuals are identical, so having SROS
in the network forces you to look a little bit deeper, if you want
VRRP to actually work.

It is easy to come up with a config which does not interoperate, and
possible to find two implementations which won't, business as usually
in IPv6, as no one uses it, edges are rough.


On Sun, 10 Jul 2022 at 00:20, Doug McIntyre <merlyn at geeks.org> wrote:
>
> 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.
>
>
>
>
>
>
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-- 
  ++ytti