Antoine Keranflec'hNotes on network automation, DevOps, and tooling.https://blog.antoinekh.dev/Antoine Keranflec'henThu, 08 Oct 2026 09:14:00 +0000Thu, 08 Oct 2026 09:14:00 +00001440Zensical RSSDraining an IS-IS router: three vendors, three LSPs, and a bug in FRRAntoine Keranflec'hbugcontainerlabfrrinteroperabilityisisjunipermulti-vendornokiaThe same IS-IS drain sends three different LSPs on SR OS, Junos and FRR. With several exits, not every drain works, and FRR breaks RFC 5305 on the maximum metric.https://blog.antoinekh.dev/posts/isis-draining-three-vendors/Antoine Keranflec'hSat, 10 Oct 2026 00:00:00 +0000https://blog.antoinekh.dev/posts/isis-draining-three-vendors/35 years of IS-IS, and vendors still disagree on two bitsAntoine Keranflec'hcontainerlabfrrinteroperabilityisisjunipermulti-vendornokiaAn IS-IS LSP with the attached and overload bits set: Junos and FRR keep the default route, Nokia SR OS drops it. The base standard and the drain use of the overload bit point in different directions.https://blog.antoinekh.dev/posts/isis-35-years-two-bits/Antoine Keranflec'hThu, 08 Oct 2026 00:00:00 +0000https://blog.antoinekh.dev/posts/isis-35-years-two-bits/