Hi Marian,

The referenced post with quotes from Juniper SE was stating that they had RFC5549 support implemented in 17.3R1. RFC5549 already contains the statement about next hop length 32 octets.

I do have an MX204 running JunOS 21.4R3 having a RFC8950 peering session up with an FRR.

Considering that this issue has been reported by FRR community before (https://github.com/FRRouting/frr/issues/6433), I believe we are receiving 32 octet next_hop (I don't know how to verify though).

This issue mentions https://github.com/gacybercenter/kinetic/issues/78 which says that JunOS 21.1 may have corrected this.

So we might have to update our compatibility list?!

André

On Fri, 21 Feb 2025 at 07:50, Marian Rychtecky via Rfc8950 <rfc8950@lists.euro-ix.net> wrote:

Hi all,
short info - we have two ASNs running JunOS 19.4. Even Juniper officially supports RFC 8950 from 17.3R1 on MX and 20.1R1 on QFX (https://lists.ix-f.net/hyperkitty/list/rfc8950@lists.euro-ix.net/message/GV2M2UQTY2BP5C25YJAXABRVSBBX3BNP/) those networks are struggling to get RFC8950 enabled.

Juniper announces "enhanced next-hop" capability, however receiving an IPv4 prefix with two next-hops (local-link and global) will tear down the BGP session. The logged message says "bad nhop len: 32 for afi 1, safi 1" - clearly not expecting two next-hops. I do not have any Juniper to test with and this sounds like an incompatibility with RFC 8950 where both next-hops are expected as per:

What are your thoughts on a problem like this?

Marian

--

Marian Rychtecký

NIX.CZ, z.s.p.o.
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Česká republika / Czech Republic

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