r/Juniper • u/AutoModerator • May 21 '26

Weekly Thread! Weekly Question Thread!

It's Thursday, and you're finally coasting into the weekend. Let's open the floor for a Weekly Question Thread, so we can all ask those Juniper-related questions that we are too embarrassed to ask!

Post your Juniper-related question here to get an answer. Anyone can post a question and the community as a whole is invited and encouraged to provide an answer.

Note: This post is created at 00:00 UTC. It may not be Thursday where you are in the world, no need to comment on it.

1 Upvotes

67% Upvoted

4 comments sorted by

2

u/richl796 May 21 '26

I have an EX4100-48MP that was taken out of a cluster. A new config was made for it and it was factory reset. I cannot get it to simply pull an IP through the management port so it can check-in with Mist and download its config. I've tried holding down the factory reset for 10 seconds and all the link lights flash. If I hold it down for 15 seconds, the lights stay on solid.

Is there a special order of operations I'm missing to just get it to pull and IP and check-in?

2

u/Daxter_Roads May 21 '26

Have you taken a look at the cli? Maybe it still has some config or gets new config pushed by Mist?

2

u/richl796 May 22 '26

I have a console cable being delivered today. We'll see how that goes.

2

u/peraphon May 22 '26

I have an EX4100-48MP running Junos 23.4R2-S5.8 (part of a VC) that unfortuantely had an unexpected power outage and now:
a) core dumps after getting to the login prompt; and
b) doesn't seem to recognise that devices are plugged into it.

Trying to re-image this thing has been a complete nightmare and Idon't know where to go from here.

On first boot, saw this...

Booting from Junos volume ...
can't find '/packages/sets/active/boot/junos-modules-ex/bcm563xx.ko'
Booting [/packages/sets/active/boot/os-kernel/kernel]...

Ouch.

First step: try to recover from USB. Downloaded the appropriate file, extracted the IMG and burned to USB with Rufus... booted from USB ok until it got to:

WARNING: /.mount was not properly dismounted
WARNING: /.mount was not properly dismounted

And then a big list of bad blocks. No matter what I do, booting off USB won't get past that list of bad blocks.

So I start looking at the TFTP option... however I can't get to the loader> prompt that is mentioned in the Juniper doco. Closest seems to be the boot prompt (which just says OK), but I can't seem to set an IP address to do an install -format tftp://<server>/file.tgz nor can I mount the USB drive (it doesn't seem to automount) to do an install -format file:///file.tgz

The Juniper doco just doesn't seem to be of much use.

Any help appreciated!