Hi all,
I just updated one of my VyOS installs again after a few months and I noticed that my core BGP connections didn't come up after the update.

I narrowed the breaking point down to the version 1.5-rolling-202501060800, which also seems to contain multiple frr related changes.

It specifically only relates to the endpoints using fe80:: addresses, an example config from it looks like this:

neighbor fe80::1 {
    address-family {
        ipv4-unicast {
            prefix-list {
                export BGP-To
                import BGP-From
            }
            soft-reconfiguration {
                inbound
            }
        }
        ipv6-unicast {
            prefix-list {
                export BGP-To
                import BGP-From
            }
            soft-reconfiguration {
                inbound
            }
        }
    }
    bfd {
        check-control-plane-failure
    }
    description xxx
    interface {
        source-interface wg1
    }
    remote-as 65000
}

The unterlying wg1 tunnel works and the other side (an OPNsense box) reports a connection reset from the VyOS machine every 6 minutes.

The previous version that contained changes in the changelog 1.5-rolling-202412160007 still works as expected and is what I downgraded to for the time being.