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R&E Global Local Pref Probe Report, measuing routing policy for the global R&E network
by Steven Wallace 18 Mar '26

18 Mar '26

**[This is in development. Suggestions or corrections are welcome!]** # R&E Global LPP Report The attached HTML file is a self-contained, interactive copy of the report. Open it in any modern web browser to explore the full tree with search, sort, and expand/collapse controls. ## What this report shows The global R&E network consists of roughly 2,700 separate networks (autonomous systems). A significant percentage of these networks have connections to both an upstream R&E provider and one or more commodity ISPs. Each network independently decides which path to prefer when routing traffic to various destinations. Campuses typically connect to a regional R&E network (e.g., MERIT, LEARN, CENIC, NYSERNet), which in turn connects to Internet2. The R&E route between two campuses is often at least 4 AS hops. If both campuses use the same commodity ISP — which happens frequently — the commodity route might only be 2 hops. Without an explicit routing policy, BGP selects the shortest AS path, and the two campuses will route via the commodity ISP instead of the R&E network. The recommended best practice is to use **BGP Local Preference** to prefer routes learned from R&E networks over routes learned from commodity ISPs. When this is done, campuses route via the R&E path regardless of AS-path length. This report visualizes routing preference data for all 2,700 R&E networks, organized as an AS-path tree rooted at Internet2 (AS 11537). ## How the probe works The Local Preference Probe (LPP) is a server connected to both the Internet2 R&E network and a commodity ISP. It sends probes from two source addresses to hosts across the R&E networks and observes how each network routes its response back — does it arrive via the R&E path or the commodity path? | Source | Address | Route design | |--------|---------|-------------| | Source A | `163.253.64.1` | R&E route is prepended towards commodity | | Source B | `163.253.63.63` | R&E route is prepended towards R&E | Both sources share the same commodity route. The difference is which direction the R&E route is prepended, so the two probes test whether the remote network chooses based on Local Preference or AS-path length. ## Reading the results Each network in the tree has a stacked bar showing three categories: | Color | Source A return | Source B return | Meaning | |-------|----------------|-----------------|---------| | **Green (RE)** | R&E | R&E | The network follows the best practice of preferring R&E routes over commodity. BGP Local Preference favors R&E. | | **Orange (Path)** | R&E | Commodity | The network uses AS-path length to choose, so some destinations use R&E while others route via commodity. R&E and commodity have equal Local Preference. | | **Red (Comm)** | Commodity | Commodity | The network appears to always prefer commodity, even when an R&E route exists. | Probes that are inconclusive (missing or unexpected return pattern) are excluded from the percentages. **Orange and red networks are connected to the global R&E network infrastructure, but are not effectively using it.** ## Customer cone percentages The stacked bar for each AS represents its **customer cone** — the AS itself plus every AS downstream of it in the R&E tree: - Each probed destination IP is classified as RE, Comm, or Path. - Counts are summed across the entire cone: the AS's own prefixes plus all downstream prefixes. - The three bar segments show each category's share of the cone total, summing to 100%. A leaf AS shows only its own results. A transit AS near the root aggregates results across hundreds of downstream networks. ## Navigating the report - **Expand/Collapse:** Click any AS row to expand or collapse its children. Use the "Expand all" and "Collapse all" buttons for bulk control. - **Search:** Type an AS number or name in the search box to highlight matches and auto-expand their location in the tree. - **Sort:** Click the RE, Comm, Path, or Pfx column headers to sort children within each expanded subtree. Click again to reverse direction, a third time to reset. - **Prefixes:** Click the "N pfx" link on any AS to see its originated prefixes. Each prefix links to the per-prefix probe tool. - **Duplicates:** An AS that appears under multiple parents is fully rendered only once. Subsequent appearances show a "see above" link that scrolls to the first occurrence. - **AS names:** Toggle between names and holder names using the "Show AS holder" button. ## Data sources | Source | Used for | |--------|----------| | [RouteViews](https://www.routeviews.org/) | BGP AS paths and prefix origin data for R&E prefixes | | [RIPE Stat](https://stat.ripe.net/) | AS names and holder information | | [CAIDA AS Organizations](https://www.caida.org/catalog/datasets/as-organizations/) | Fallback AS name data | | lpp-store | Historical LPP probe results used to compute cone percentages | In the future, the report will be rebuilt daily at UTC midnight. ## Project This report is part of the [CICI-ROOTBEER](https://www.caida.org/funding/cici-rootbeer/) project. Steven Wallace Director - Routing Integrity Internet2 ssw(a)internet2.edu

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Supercomputing 2026 NRE Call for Participation
by Brenna Meade 18 Mar '26

18 Mar '26

Hi Routing Working Group, Please send this out to your community. Brenna Meade Internet2 bmeade(a)internet2.edu<mailto:meadeb@internet2.edu> ________________________________ From: Jeronimo Bezerra <jbezerra(a)supercomputing.org> Sent: Wednesday, March 18, 2026 9:20 AM To: jet(a)nitrd.gov <jet(a)nitrd.gov>; all(a)lists.gna-g.net <all(a)lists.gna-g.net>; cybinf-engr(a)es.net <cybinf-engr(a)es.net>; scinet(a)scinet.supercomputing.org <scinet(a)scinet.supercomputing.org>; nre-experimenters(a)scinet.supercomputing.org <nre-experimenters(a)scinet.supercomputing.org> Cc: mgmt26(a)scinet.supercomputing.org <mgmt26(a)scinet.supercomputing.org> Subject: [mgmt26] Supercomputing 2026 NRE Call for Participation SC26 Network Research Exhibitions (NRE) – Call for Participation We are excited to look ahead to SC26 in Chicago, IL, and the time has arrived to submit proposals for the Network Research Exhibition (NRE) program. The NRE represents the experimental research frontier of SCinet, providing a production-scale, high-performance networking environment to support advanced demonstrations in networking, distributed systems, data-intensive science, HPC, and AI. Researchers and professionals from academia, government, laboratories, and industry are invited to propose experiments and demonstrations that leverage SCinet’s world-class infrastructure during the SC Conference. Researchers and professionals from government, academia, research institutions, and industry are invited to propose demonstrations and experiments that leverage SCinet’s world-class infrastructure during the SuperComputing Conference. SC26 Focus Areas For SC26, the SCinet team aims to make research and experimentation more impactful and locally connected. With Chicago as our host city, we encourage proposals that engage with themes relevant to the region and its communities, including: * FinTech innovations, such as high-frequency trading, real-time analytics, and ultra–low-latency networking, by examining the performance and scale required for these data-intensive workloads * Quantum computing and quantum networking demonstrations * Healthcare and biomedical research applications, with emphasis on data-intensive cancer research * Community-engaged research leveraging advanced networking infrastructure We invite researchers to utilize the SCinet network and cluster environment to showcase forward-looking technologies and transformative research workflows. Core High-Performance Networking Themes At the same time, we remain committed to SCinet’s foundational mission. Proposals demonstrating: * Emerging network hardware and architectures * Advanced protocols and transport mechanisms * Network-intensive scientific workflows * High-performance networking innovations * HPC- and AI-driven distributed applications are strongly encouraged. Engage With the NRE Team The NRE team is available for one-on-one consultations to help refine ideas and determine infrastructure feasibility. If you are unsure whether your research could benefit from what is arguably the fastest temporary network infrastructure in the world, we encourage you to reach out and schedule a session: nre(a)scinet.supercomputing.org <mailto:nre@scinet.supercomputing.org> For additional details, visit the NRE information page: https://sc26.supercomputing.org/scinet/network-research-exhibition/ We look forward to collaborating with you and showcasing groundbreaking research at SC26. NRE Proposal Submissions Pre-staging: Preliminary Network Requirements It is critical to provide early input to SCinet in terms of WAN bandwidth requests. Significant lead times are required to work with service providers and equipment vendors to plan, build, and validate WAN circuits. Early input is key to ensuring that the network can meet the needs of NRE applicants. Please indicate on the Network Resource Form your connectivity needs so we can understand whether this initiative will benefit NRE participants. * Submission format: On-line form * Submission location: https://submissions.supercomputing.org/ * Submission deadline: April 15th, 2026 Stage 1: Preliminary Abstract A one-page document outlining the high-level goals and activities related to the proposal is required to start the process. Only a single experiment should be included. Additional experiments should be outlined in separate documents. Please include details on networking needs such as end points/sources and network connection requirements. Note that, just like in 2025, this year submissions will be captured in the SC submission system. You may need to create an account. * Submission format: Download Template: https://bit.ly/sc26nre_template * Submission location: https://submissions.supercomputing.org/ * Submission deadline: April 30th, 2026 Stage 2: Refined Network Requirements Please provide additional documentation outlining the final network requirements for the planned exhibition including sources (city, state, country of origin), bandwidth needs, VLAN requirements, and destination booth drops. WAN bandwidth requests that differ significantly from those outlined in the Preliminary WAN Requirements and/or resources section of the Preliminary Abstract may not be able to be fulfilled. * Submission format: Any relevant submission style will be accepted. * Submission location: https://submissions.supercomputing.org/ * Submission deadline: April 30th, 2026 Stage 3: Final Publishable Proposal A two- to three-page submission with all relevant details of the activities, drawings, impact, and other research details, will also be required. This document will be published on the public SCinet NRE webpages. * Submission format: Updated Preliminary Abstract format with final details and any changes from the Preliminary Abstract. * Download Template: https://bit.ly/sc26nre_template * Submission location: https://submissions.supercomputing.org/ * Submission deadline: October 23rd, 2026 Stage 4: Research Results and Findings Lastly, the submission of findings and results of the demonstration will complete the process. * Submission format: Same as the Final Publishable Submission * Submission location: https://submissions.supercomputing.org/ * Submission deadline: January 22nd, 2027 As a reminder, it is critical to adhere to the above deadlines to ensure a successful SCinet demo. ** Booth information ** The NRE must be presented or demonstrated on the show floor, therefore you must be associated with an SC26 booth. SC provides a theater setting where research presentations are scheduled. Booth connections can be requested via the Connection Request System https://scinet.supercomputing.org/crs/ Accepted NRE participants will receive a 100% discount on network services to support the research activities. Please note: SCinet does not pay costs associated with the booth: this includes the space, furnishing, shipment of equipment, or the power required to operate technology equipment at booths. The booth owner / researcher MUST pay for all of these costs to participate The NRE team will confirm receipt of submission documents and will start the review process. We will be in contact with the involved parties throughout the process. We look forward to receiving your NRE Preliminary Abstract on or before April 30th, 2026. If you have questions prior to then, please contact us here: nre(a)scinet.supercomputing.org<mailto:nre@scinet.supercomputing.org> NRE FAQ 1. Can you submit a proposal outside of network research? Proposals are open to more than just networking research. Proposals are not limited to networking research. Demonstrations in other domains are welcome provided that high-performance networking and/or HPC resources are central to the research workflow. 1. Can you submit one proposal for multiple experiments? No, each experiment / demonstration must be submitted individually. 1. Does SCinet pay for costs associated with an SC26 booth (e.g., space, furnishings, shipment of equipment, or power)? No, these costs are the sole responsibility of the booth owner 1. Does SCinet pay for your NRE booth connection? Yes. SCinet provides a 100% discount on network connectivity services supporting accepted NRE demonstrations, subject to resource availability. 1. Do presentations / demonstrations have to be in person / at a booth? Yes, generally a demo representative must be available at a booth for the duration of the SC26 show to perform/explain the demonstration and be available to answer questions from attendees. We also encourage researchers to present their work at the SC Theater. 1. What is the preferred format for submissions? PDF is the preferred format. Want to know more about NRE? Check our slides: https://bit.ly/sc26_nre_slides Kind Regards, SC26 NRE Team -- You received this message because you are subscribed to the Google Groups "SCinet Management 26 Mailing List" group. To unsubscribe from this group and stop receiving emails from it, send an email to mgmt26+unsubscribe(a)scinet.supercomputing.org<mailto:mgmt26+unsubscribe@scinet.supercomputing.org>. To view this discussion visit https://groups.google.com/a/scinet.supercomputing.org/d/msgid/mgmt26/CAHfh_…<https://groups.google.com/a/scinet.supercomputing.org/d/msgid/mgmt26/CAHfh_…>.

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[AARNet Official] If anyone is having issues joining our meeting today, please use https://internet2.zoom.us/j/84695445069
by Warrick Mitchell 17 Mar '26

17 Mar '26

[AARNet Official] Hi All, If you are trying to connect and it's sitting waiting, it appears there was an issue with the calendar invite, please use: https://internet2.zoom.us/j/84695445069 Kind regards, Warrick Mitchell (He/Him) Director of Architecture Upcoming leave: warrick.mitchell(a)aarnet.edu.au<mailto:warrick.mitchell@aarnet.edu.au> +61 416 089 354 Perth (AWST, UTC+08:00) [AARNet Logo] AARNet Pty Ltd PO Box 5519, Chatswood, NSW 1515, Australia aarnet.edu.au<https://www.aarnet.edu.au/> | Follow us on LinkedIn<https://linkedin.com/company/aarnet> AARNet Official AARNet Official AARNet Official This email and any attachments may contain personal and/or confidential information and is intended solely for the individual or entity to whom they are addressed. Any personal information contained herein should be handled in accordance with applicable data protection laws, regulations and applicable privacy policy. If you have received this email in error, please notify the sender immediately and delete all copies from your system. Any unauthorised use or distribution of any part of this email is strictly prohibited.

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RWG March Meeting
by Brenna Meade 16 Mar '26

16 Mar '26

Hi Routing Working Group! Please see slides and video recording from our February Meeting 2026-02-24 Folder https://drive.google.com/drive/folders/15nOS7EmPUYp7tksb4ntVBn69M42pVNJ9?us… I have attached the calendar invite for our March meeting March 17, 2026 8 am EDT / 12 PM UTC Agenda: Speakers: Steve Wallace, Jeff Bartig Topic: CAIDA / Internet2 ROOTBEER project Discussion and questions Possible new routing case AOB Let us know if you have any questions or any cases you'd like to discuss Brenna Meade Internet2 bmeade(a)internet2.edu<mailto:meadeb@internet2.edu>

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[AARNet Official] Reminder: Routing-WG today has been postponed to next week
by Warrick Mitchell 18 Feb '26

18 Feb '26

[AARNet Official] Hi Everyone, Just a reminder the Routing-WG meeting that was scheduled to start in 40 minutes from now has been postponed until next week as per our previous email. Kind regards, Warrick, Brenna and Hans This email and any attachments may contain personal and/or confidential information and is intended solely for the individual or entity to whom they are addressed. Any personal information contained herein should be handled in accordance with applicable data protection laws, regulations and applicable privacy policy. If you have received this email in error, please notify the sender immediately and delete all copies from your system. Any unauthorised use or distribution of any part of this email is strictly prohibited.

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[AARNet Official] Rescheduling of the Routing Working Group - US PM meeting
by Warrick Mitchell 15 Feb '26

15 Feb '26

[AARNet Official] Hi All, Due to a scheduling conflict for our presenter on BGPWatch, we have had to delay this meeting to be one week later on Wednesday the 25th of February at 1am UTC. I have sent out a new meeting invite for the 25th of February at 1am UTC to the mailing list, which you should have received in your email now. Please remove the old meeting entry on the 18th of February at 1am UTC from your calendar. Agenda --------- Presentation: BGP Watch Discussion: What opportunities are there to increase collaboration with this project? Any other discussion or questions? Kind regards, Warrick, Brenna and Hans This email and any attachments may contain personal and/or confidential information and is intended solely for the individual or entity to whom they are addressed. Any personal information contained herein should be handled in accordance with applicable data protection laws, regulations and applicable privacy policy. If you have received this email in error, please notify the sender immediately and delete all copies from your system. Any unauthorised use or distribution of any part of this email is strictly prohibited.

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[AARNet Official] Rescheduled February - Routing Working Group - US PM Meeting
by Warrick Mitchell 15 Feb '26

15 Feb '26

[AARNet Official] Hi All, Due to a scheduling conflict for our presenter on BGPWatch, we have had to delay this meeting to be one week later on Wednesday the 25th of February at 1am UTC. Agenda --------- Presentation: BGP Watch Discussion: What opportunities are there to increase collaboration with this project? Any other discussion or questions? Kind regards, Warrick, Brenna and Hans [https://us02web.zoom.us/account/branding/p/73aebbd9-5289-4bf2-ab58-8038a345…] <https://www.aarnet.edu.au> Warrick Mitchell is inviting you to a scheduled AARNet Zoom meeting. Join Zoom Meeting<https://aarnet.zoom.us/j/86039854688?pwd=0TZTDc6NIac3XcPpS7cVFSnLArsWbq.1&f…> This meeting may be recorded, transcribed, or digitally summarised in Australia. You will be notified during the meeting if these features are used. Contact the host prior to the meeting with any concerns. Phone one-tap: Australia: +61280152088,,86039854688#,,1#,637336#<tel:+61280152088,,86039854688#,,1#,637336#> Meeting URL: https://aarnet.zoom.us/j/86039854688?pwd=0TZTDc6NIac3XcPpS7cVFSnLArsWbq.1&f… Meeting ID: 860 3985 4688 Password: 637336 Join by Telephone For higher quality, dial a number based on your current location. Dial: Australia: +61 2 8015 2088 Meeting ID: 860 3985 4688 Password: 637336 International numbers<https://aarnet.zoom.us/u/kj5F35DDP> Join from an H.323/SIP room system Dial: 86039854688(a)global.zoomcrc.com or 86039854688(a)zmau.us Meeting ID: 860 3985 4688 Password: 637336 This email and any attachments may contain personal and/or confidential information and is intended solely for the individual or entity to whom they are addressed. Any personal information contained herein should be handled in accordance with applicable data protection laws, regulations and applicable privacy policy. If you have received this email in error, please notify the sender immediately and delete all copies from your system. Any unauthorised use or distribution of any part of this email is strictly prohibited.

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Next Weeks RWG Meeting Agenda and Invite
by Addleman, Hans C 10 Feb '26

10 Feb '26

Greetings Routing Working Group, Here is the agenda for next weeks meeting! We look forward to seeing you all. Presentation: BGP Watch Discussion: What opportunities are there to increase collaboration with this project? Any other discussion or questions? Thanks, Hans, Brenna, and Warrick

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Routing Working Group Upcoming Meetings.
by Addleman, Hans C 15 Jan '26

15 Jan '26

Greetings Routing Working Group members, Welcome to 2026! We are going to cancel the January meeting scheduled for January 20th. The leadership team is meeting this month to plot out the next year, and we look forward to seeing you at our next meeting in February. Please find a calendar invite for that meeting attached with a temporary zoom room. If you have any ideas for topics, guest speakers, or tools we should investigate please feel free to send mail to the list, myself, Brenna, or Warrick. Thanks and we will see you all in February, Hans

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No Routing Working Group tonight
by Meade, Brenna 16 Dec '25

16 Dec '25

Hi all, The December Routing Working Group meeting occurred last week at Tech Ex. There is no meeting tonight. Please look for next year’s meeting invites after the first of the year. I wish you all a wonderful new year and look forward to collaborating next year! Brenna Meade

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