From saku at ytti.fi  Fri Jul 24 02:19:30 2026
From: saku at ytti.fi (Saku Ytti)
Date: Fri, 24 Jul 2026 09:19:30 +0300
Subject: [j-nsp] JNPR ER and RFC5837
Message-ID: <CAAeewD90POb-1usuj1HGGnj0jJnsU1uWD-utkjoMgRBLAUneaA@mail.gmail.com>

Hello,

Juniper supports RFC5837 on QFX but not for TTL exceeded.

RFC5837 specifies ICMP EO (extension object, you're already familiar
with MPLS Label EO) which can include things like ifIndex, IP, name
for an sub-interface, such as LAG interface member.

RFC5837 would allow your partners to provide you with the exact link
they observe the problem with, it would allow your own internal
measurement tools to dynamically discover which UDP keys to use, so
that the tool can set up measurements in such a way that every
interface is measured and performance is reported for every interface.

There is ER-086550 asking this feature to be implemented for TTL
exceeded as well as MX.

If you have real need for this feature, consider asking your account
team to prioritise delivering it for you.

-- 
  ++ytti