On 30 September 2019 01:52:22 CEST, Ondrej Zajicek
Yes. Technically it is not because the other route is also BGP, but
because the other route is also recursive / also has indirect next hop.
BIRD implements only one level of indirection.
Is this a problem? Which use cases require more levels of indirections?
"The BGP Tunnel Encapsulation Attribute" is one example:
7. Recursive Next Hop Resolution > Suppose that:
o a given packet P must be forwarded by router R1;
o the path along which P is to be forwarded is determined by BGP
UPDATE U1;
o UPDATE U1 does not have a Tunnel Encapsulation attribute;
o the next hop of UPDATE U1 is router R2;
o the best path to router R2 is a BGP route that was advertised in
UPDATE U2;
o UPDATE U2 has a Tunnel Encapsulation attribute.
Then packet P MUST be sent through one of the tunnels identified in
the Tunnel Encapsulation attribute of UPDATE U2. See Section 5 for
further details.
https://tools.ietf.org/html/draft-ietf-idr-tunnel-encaps-13#section-7
/Mikma
