[Babel-users] Detect one-hop and two hops nodes

[Juliusz Chroboczek]

> We are developing an application on top of Babel. In this application, we
> have to decide how to communicate with one hop and two hop nodes, and
> treat these connections differently.

Babel (the protocol) does not have this information.

If the announced metric of a route is 0, then you can be pretty confident
that it is being announced by a neighbour.  If the announced metric is not
0, then there's nothing that can be said -- it could be announced by
a non-neighbouring node, or it could be the effect of route filtering
increasing the metric.

> Is there a simple way of detecting one-hop and two-hop nodes?

You would need to define an extension.  For example, you could have nodes
announce their router-id, or you could carry the hop count in a sub-TLV of
the update TLV.

-- Juliusz