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© 1992–2023 Cisco Systems, Inc. All rights reserved.

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
Featured Speakers
Chris Villemez
Technical Marketing Engineer
Kemal Sanjta
Principal Internet Analyst

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
Before We Begin...
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@ThousandEyes
© 1992–2023 Cisco Systems, Inc. All rights reserved.

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
Agenda
• About ThousandEyes
• Digital Service Building Blocks
• Microsoft Outage Summary
• Live Data/Sharelink Review
• Lessons & Takeaways
• Q&A
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@ThousandEyes

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
Actionable Insight for Internet, Cloud, and SaaS
Correlated Insights
Quickly isolate issues to app, network,
or service
Network Visibility
Overlay, hop-by-hop underlay, ISP
performance, and BGP routing
App Experience
SaaS, API, and internal app
performance and user experience

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
CDN
Cloud
BGP
DNS
The Building Blocks of Today’s Digital Services
SaaS

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© 1992–2023 Cisco Systems, Inc. All rights reserved. 7
Microsoft Outage Summary
• Significant disruption that impacted connectivity to many
services, including Azure, Teams, Outlook and Sharepoint
– High levels of packet loss
– Both Microsoft and other services became unavailable due to
connectivity disruptions
• Outage started around 7:05 AM UTC and lasted until 8:50
AM UTC, at which time packet loss returned to 0%
• Triggered by an external BGP change by Microsoft that
impacted connected service providers
– Led to destabilization of global routes to its prefixes
– Significant packet loss and diminished reachability of its services
– During the incident, DNS changes were observed that may have
indicated steps to steer traffic away from impacted areas within
Microsoft’s network.

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
ThousandEyes Global View During The Outage

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Live Data/Sharelink
Review

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
Gain Network and Application Outage Visibility Using Internet Insights
• Internet Insights provides a macro-
level view of ongoing network and app
outages
• Global data collected from different
networks, ISP’s, and transit providers
• Data is fed into the platform to help
enterprise users correlate performance
issues with broader outages and
quickly pinpoint where an issue is
occuring
Learn More About Internet Insights

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© 1992–2023 Cisco Systems, Inc. All rights reserved.
Key Lessons and Takeaways
• Don’t underestimate the importance of change management
– With diligent process, change reviews, prepared rollback plans, and quality
assurance testing prior and after any change, the risks of disruption can be
greatly reduced.
• Robust visibility is essential
– This includes end-to-end visibility across all technology domains involved
in delivering the service to users.
– Knowing as quickly as possible that performance has drifted from desired
levels is critical to reducing the pain to your customers, users, and
partners.
– IT teams must also be able to quickly pinpoint where the fault is and who
owns and can fix it.

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@ThousandEyes
Learn
more
Free
Trial /
Demo
Next Steps
© 1992–2023 Cisco Systems, Inc. All rights reserved.
• Subscribe! https://blog.thousandeyes.com
• Get a real-time view of the health of the Internet
https://thousandeyes.com/outages
• Sign up for a Free Trial:
https://www.thousandeyes.com/signup
• Request a demo:
https://www.thousandeyes.com/request-demo

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Q&A