RFC 5549 - IPv4 Routes with IPv6 next-hop - Does it really exists?

Wed Jul 29 09:13:27 UTC 2020

On Wed, 29 Jul 2020 at 10:03, Vincent Bernat <bernat at luffy.cx> wrote:

> This is the solution Cumulus is advocating to its users, so I suppose
> they have some real users behind that. Juniper also supports RFC 5549
> but, from the documentation, the forwarding part is done using
> lightweight tunnels.

I'm not sure if you claim otherwise, but no real 'tunneling' takes
place, as far as I know, it's internal implementation detail having
IPV6 next-hop for IPV4. I don't think there is any additional headers
or any additional lookup or cost.
Cisco supports extended nexthop encoding too, so it is fairly well
supported by shipping products.

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