For those of you interested in all the details around how the transit as
well as host-inbound and host-outbound traffic is handled on juniper MX3D
Trio architecture I'd recommend reading the following FREE book in its
entirety.
https://www.juniper.net/us/en/training/jnbooks/day-one/networking-technologi
es-series/packet-walkthrough-mx-series/
It's an excellent book that will answer, among others, all your questions
around where the ICMP might be delayed in the system and where and how it is
handled.
I'd say it's a must read for all NetEng/Arch working with Juniper MX.
This is sure a very good resource (from the excellent David Roy). I've
already read it in the past and forget most of it. So for icmp we are in
the case of an "exception packet" that are "punted" to the RE. But the
document did not detail what really happen in the RE. It mention that
theses packets transit by gigabit ethernet interfaces in the TPP
proprietary protocol, but nothing after. What daemon is in charge of
handling TPP flow on the RE side ? rpd ? for icmp is at the end the
packet go through the freebsd kernel (seems logic but). And what cause
latency in response ?
--
Raphael Mazelier
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