Meraki MS420 custom firmware testers wanted

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hmartin

Well-Known Member
Sep 20, 2017
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You may remember me from such threads as Meraki MS220-series FOSS firmware and Meraki MS210/MS225 custom firmware testers wanted.

The Meraki MS420 series comprised 24 and 48 port SFP+ switches launched in the early 2010s. The MS420 reached its official EoL in 2023, and is no longer supported by Meraki. The drawback of this old and inexpensive hardware is of course, noise and power consumption. They have 4 screaming 40mm fans that operate at ~15k RPM, and idle power consumption is around 100W.

My aim here is to avoid more e-waste, since the switches are still quite capable and anyone who has one laying around right now will be tempted to send it to e-waste, which is categorically is not.

The MS420 series have a PowerPC management CPU (Freescale P2020E) with 2GB of RAM and 128MB of NAND. The switch ASIC is a Broadcom Trident+ (BCM56840).

Since they are EoL, they can be purchased extremely inexpensively (a seller recently accepted $45 BO for an MS420-24). Although given that other SFP+ switches from this era are also similar in noise/power and are quite cheap without modification, I would not suggest you all to rush out and submit an offer on a used MS420 ;)

If you have a Meraki MS420(-24/48) and are willing to test a very alpha firmware (and really, I cannot stress this enough, your expectations should be LOW) please get in touch.
 
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adisor19

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Nov 19, 2024
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Umm, i got an MS425 ready to be sacrificed if you by any chance are able to cook something up.. (I can open it and connect a serial cable as well if needed)
 

hmartin

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Sep 20, 2017
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Umm, i got an MS425 ready to be sacrificed if you by any chance are able to cook something up.. (I can open it and connect a serial cable as well if needed)
The MS425 is not the same platform as the MS420.

There is no custom firmware for the MS425 yet, I am still waiting for Meraki to comply with my GPL request for the U-Boot and Kernel source code.
 

xcomm

New Member
Feb 3, 2023
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Minnesota
I got two MS420s form a work de-com pile I don't mind sacrifice.
Also they are 24 port versions and at idle only pulling like 38watts. Unclaimed from Meraki they work as a flat switch with out the a license. you can also log into the web management port. Its management port does dhcp, and every port is a trunk and that cant be changed but the untagged vlan can be updated.
 

hmartin

Well-Known Member
Sep 20, 2017
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Also they are 24 port versions and at idle only pulling like 38watts.
This does not match my experience with the MS420-24, which draws 85W idle.

Can you confirm the part number of the switch? The MS420-24 should be 600-29020. The MS210/225/250 series idle around 38W, but this is well below the expected power consumption of the MS420.
 

xcomm

New Member
Feb 3, 2023
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Minnesota
This does not match my experience with the MS420-24, which draws 85W idle.

Can you confirm the part number of the switch? The MS420-24 should be 600-29020. The MS210/225/250 series idle around 38W, but this is well below the expected power consumption of the MS420.
Did a quick double check, and its 69.5 no sfp and 71.2 with a single 10g sr. (Single PSU)
 

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drkavnger99

New Member
Feb 24, 2025
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Let me know if that firmware gets released to test. I bought those switches and I only will use 1 of them. LMK if and when something is release even if an alpha. Appreciate the work
 

DinoIA

New Member
Aug 1, 2025
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I have two MS420-24's that were saved from my companies ewaste room. Don't mind if they are sacrificed for the cause, lmk if you are still accepting testers.
 

sysanomaly

New Member
Dec 2, 2025
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interested in testing on 24 port units. Appreciate the documentation on these switches, great work