@Viacheslav, when I try that I get the following:

Version of Vyos I have is:

Ok, I got the new version of code and here is what I found. As a baseline here's the Vyos config, and it's more or less the same as before but I moved lab environments:

Would it be reasonable to use BFD for this? Since BFD is already implemented we might be able to use that as well?

In T915#73449, @Viacheslav wrote:

PR https://github.com/vyos/vyos-1x/pull/531
Add discovery hello timers

In T915#73395, @Viacheslav wrote:

@Cheeze_It Thank's. Can you describe what features you are missing?
And if possible, an example configuration.

I also want to add more verification. I was able to bring up LDP *properly* to a Juniper as well. The one thing I was not able to 100% verify was that the labels themselves were proper from end to end *BUT* the Junipers did properly see the labels and did allocate from Vyos. Vyos itself also did the same. Due to a lack of ability to specify an explicit null I cannot absolutely verify yet, but I hope to be able to in the future. SO far though it seems that you guys have done a good job making sure that the P functionality works, and label allocation works. Well done. I was *ALSO* able to make the MPLS label pop up properly. Please check the very bottom for the verification of it working :)

In theory, service providers use OSPF and ISIS for IGPs. LDP in theory shouldn't really care which protocol is used for the next hop as long as the next hop resolves and the label is there for the next hop for that LSP. Albeit I will admit I am not sure how it is organized in FRR. OSPF and ISIS should both be able to work though for next hops, and they should be consistent.