[E-impact] Re: [Green] [IMC'25] Fantastic Joules and Where to Find Them
Colby Barth <cbarth@juniper.net> Mon, 03 November 2025 14:25 UTC
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From: Colby Barth <cbarth@juniper.net>
To: Romain Jacob <jacobr@ethz.ch>, "green@ietf.org" <green@ietf.org>, "sustain@irtf.org" <sustain@irtf.org>, "e-impact@ietf.org" <e-impact@ietf.org>
Thread-Topic: [Green] [IMC'25] Fantastic Joules and Where to Find Them
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Date: Mon, 03 Nov 2025 14:25:25 +0000
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Subject: [E-impact] Re: [Green] [IMC'25] Fantastic Joules and Where to Find Them
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Hi Roman, Speaking on behalf of a vendor (Juniper Networks), we publish quite detailed information about the power consumption of various components in our systems. I can provide you publicly accessible examples or you can cast me. From a power savings perspective, turning off the optics, while it will save some power, it's the ability to turn off, more power hungry, components such as forwarding engines when their associated ‘ports’ are no longer needed where you will get significant savings. Lastly, from a “routing" perspective, you might want to check out https://datatracker.ietf.org/doc/draft-many-lsr-power-group/ which describes protocol extensions to facilitate traffic consolidation and therefore enable the necessary power transitions of unused components. Cheers, —Colby Juniper Business Use Only From: Romain Jacob <jacobr@ethz.ch> Date: Monday, November 3, 2025 at 8:15 AM To: green@ietf.org <green@ietf.org>, sustain@irtf.org <sustain@irtf.org>, e-impact@ietf.org <e-impact@ietf.org> Subject: [Green] [IMC'25] Fantastic Joules and Where to Find Them [External Email. Be cautious of content] Hello everyone, I just wanted to share that I presented last week at IMC our (not-so-recent-anymore) work on router power modeling and optimization. In short, we validated a router power model that is able to capture the power effect of traffic volume and interface configuration (on/off and the link speed). Using this power model, we estimated that turning links off in an ISP network (e.g., at night or whenever utilization is low) would save essentially nothing nowadays (<1%). This isn't because the link power budget is negligible (it isn't), but because, in many cases, hardware components are **not powered off** when they are "turned off." This appears to be a software problem, which can (and should) be fixed. I'll be presenting this work at IETF'124 (remotely) on Friday in the SUSTAIN RG session. 16min video: https://youtu.be/idVvNk31pVQ Slides: https://nsg.ee.ethz.ch/files/public/slides/2025-10-31_IMC_FantasticJoules_1.pdf Paper: https://doi.org/10.3929/ethz-b-000728960 Happy to chat more if anyone is interested. Cheers, -- Romain JACOB Postdoctoral Researcher ETH Zurich Networked Systems Group (NSG) Lead: Prof. Laurent Vanbever www.romainjacob.net<https://www.romainjacob.net/> @RJacobPartner<https://twitter.com/RJacobPartner> @jacobr@discuss.systems<https://discuss.systems/@jacobr> Gloriastrasse 35, ETZ G84 8092 Zurich +41 7 68 16 88 22
- [E-impact] [IMC'25] Fantastic Joules and Where to… Romain Jacob
- [E-impact] Re: [Green] [IMC'25] Fantastic Joules … Colby Barth
- [E-impact] Re: [Green] [IMC'25] Fantastic Joules … Romain Jacob