Are you also affected? They would start back up again, working their way through all the BGP rules until they got to the offending Flowspec rule again. First, it may have been that the Flowspec rule and the significant load that large number of BGP updates imposed on their routers made it difficult for them to login to their own interfaces. Given the number of providers we have access to, we are generally able to continue to route traffic even when one provider has an issue. CenturyLink outage led to a 3.5% drop in global web traffic. Globally, we saw a 3.5% drop in global traffic during the outage, nearly all of which was due to a nearly complete outage of CenturyLink’s ISP service across the United States. While we’re waiting for a post mortem from CenturyLink/Level(3), I wanted to write up the timeline of what we saw, how Cloudflare’s systems routed around the problem, why some of our customers were still impacted in spite of our mitigations, and what appears to be the likely root cause of the issue. and smaller outages happen all the time. In addition to studying the Internet itself, This is why the failover, while automatic, isn’t instantaneous in all locations. Our technicians are working to resolve an IP outage. the extent of weather events such as hurricanes The outage can be best seen by comparing before, during, and after. If the offramp is blocked, then there’s no way to reach the town. Update From Centrylink at approx 15:00 UTC / 11:00 EDST: The IP NOC with the assistance of the Operations Engineering team confirmed a routing issue to be preventing BGP sessions from establishing correctly. This can be a powerful tool for downstream customers wishing to block attack traffic, but can make it much more difficult to track down an offending Flowspec rule when something goes wrong. If that were the case, what may have happened is that every router in CenturyLink/Level(3)’s network would receive the Flowspec rule. We are working hard to clear the outage and want to keep you up-to-date! At 10:03 UTC our monitoring systems started to observe an increased number of errors reaching our customers’ origin servers. You can also see how we automatically shifted traffic to other network providers during the incident to mitigate the impact and ensure traffic continued to flow. So why did it take more than four hours to resolve? Many network providers will allow Flowspec peering. Apps and websites including major streaming service Hulu, as well as the PlayStation network and XBox Live platforms reported disruptions ... CenturyLink suffered a massive outage in 2018 that affected ATM withdrawals, 911 calls and other services. We suffered our own Flowspec-induced outage more than 7 years ago. ... August 30, 2020. Second, it also may have been that the Flowspec rule was not issued by CenturyLink/Level(3) themselves but rather by one of their customers. please contact us if you are interested. We appreciate their team keeping us informed with what was going on throughout the incident. suffered a network outage that affected much of their national network. The Flowspec rule would no longer be received. CenturyLink L3 outage knocks out web giants and 3.5% of all internet traffic . The following graph shows 522 errors (indicating our inability to reach customers’ applications) across our network during the time of the incident. The red portion shows CenturyLink/Level(3) traffic, which dropped to near-zero during the incident. — CenturyLink (@CenturyLink) August 30, 2020 The outage also affected other internet services, including web infrastructure company Cloudflare which had a … The status report indicates that the Flowspec rule prevented BGP itself from being announced. This outage was noted in CNN So what is Flowspec? One challenge of this is that on every cycle, the queue of BGP updates would continue to increase within CenturyLink/Level(3)’s network. One possible explanation is that the offending Flowspec rule came near the end of a long list of BGP updates. On Sunday, August 30, 2020, CenturyLink suffered a network outage that affected much of their national network. They are a very sophisticated network operator with a world class Network Operations Center (NOC). CenturyLink Outage Map Check Current Status. Ft. Collins, Colorado (from Colorado State University); thes algorithms to our near-real-time data feed. — CenturyLink (@CenturyLink) August 30, 2020. and by the National Science Foundation through the and EIEIO (NSF Core-Small CNS-2007106) Projects. On Sunday, August 30, 2020, CenturyLink ZDNet summarized reports suggesting that Today CenturyLink/Level(3), a major ISP and Internet bandwidth provider, experienced a significant outage that impacted some of Cloudflare’s customers as well as a significant number of other services and providers across the Internet. about our world. It provides internet, television, phone and home security services to residential, business, governmental and wholesale customers. Not impressed with @cableONE could only tell me they were aware of the outage..no etr Starting to think its time to go back to @CenturyLink February 27, 2015 7:08 AM Ryan Landeis @landeis Thanks for being here, come back soon. We can only speculate what happened at CenturyLink/Level(3), but one plausible scenario is that they issued a Flowspec command to try to block an attack or other abuse directed at their network. Internet backbone operator CenturyLink has experienced an outage that degraded performance of major web companies around the world. We only use this information for this particular outage. August 30, 2020 — CenturyLink/Level 3: The Outage Heard Round the World Then, on August 30, the big one: CenturyLink/Level 3 suffered a control plane failure, lasting nearly 5 hours. A BGP update is the signal a router makes to say that a route has changed or is no longer available. We currently scan, 24x7, about 5 million /24 network prefixes (each an IPv4 network like 192.0.2.*). (this data will be in They are a very sophisticated network operator with a world class Network Operations Center (NOC). It allows you to efficiently push rules across an entire network almost instantly. August 30, 2020 Problem at US telecoms giant causes global internet outages. At the start of the incident, the number of BGP updates spiked to more than 26MBs of BGP updates per 15 minute period and stayed elevated throughout the incident. our data here shows only about 1/5th of all the blocks we measure. Our team was able to apply additional manual mitigations to reduce the number of errors another 5 percent. On August 30th, 2020 CenturyLink/Level 3 suffered a major incident, lasting nearly 5 hours, that impacted their network, their customers, and many other ISPs and services either directly or indirectly connected to their network. — CenturyLink (@CenturyLink) August 30, 2020 We are working hard to fix an IP outage and have begun to see restoration in several areas. We observed the CenturyLink outage in Trinocular’s near-real-time reporting. Networks the size and scale of CenturyLink/Level(3)’s are extremely complicated. We were successful in keeping traffic flowing across our network for most customers and end users even with the loss of CenturyLink/Level(3) as one of our network providers. #hugops. (HTML5/MPEG-4 video). A mystery remains, however, why global BGP updates stayed elevated throughout the incident. Like 2020, CenturyLink’s network was caught in an endlessly looping nightmare. Aug. 30, 2020 Status overview Comments Unable to display this content to due missing consent. We are observing reachability from Los Angeles (from the University of Southern California); We no longer use Flowspec ourselves, but it remains a common protocol for pushing out network firewall rules. BGP would be dropped again. We have observing global network outages since December 2013 with Trinocular, — CenturyLink (@CenturyLink) August 30, 2020 The outage began early Sunday, and according to Cloudflare’s status page , it was seeing “an increased level … User reports indicate CenturyLink is having problems since 6:12 AM EDT. Our Network Operations Center was also alerted and our team began taking additional steps to mitigate any issues our automated systems weren’t automatically able to address beginning at 10:09 UTC. Once you enter your preferred method of contact, you will be notified with all updates about the outage up to the point it is cleared. In addition to implementing gone-dark detection to remove much of the before and after false positives, It is how routers on the Internet announce to each other what IPs sit behind them and therefore what traffic they should receive. and affected a number of customers using CenturyLink as a transit network provider. Athens, Greece (the Athens University of Economics and Business); August 31, 2020 Youtube Posts. Click on the picture to see the animation: (You need a browser with HTML5 and WebM video support) this outage reduced global web traffic by a noticeable amount. The CenturyLink/Level(3) status update offers some hints and points at a flowspec update as the root cause. Cloudflare is connected to CenturyLink/Level(3) among a large and diverse set of network providers. that responded in the past but have not responded in some time. So why did it take more than four hours to resolve? In the case of customers whose only connectivity to the Internet is via CenturyLink/Level(3), or if CenturyLink/Level(3) continued to announce bad routes after they'd been withdrawn, there was no way for us to reach their applications and they continued to see 522 errors until CenturyLink/Level(3) resolved their issue around 14:30 UTC. dataset internet_outage_adaptive_a41-20200701 when it is released). and we are studying if it can tell us about COVID-19 lockdowns. At Cloudflare, early in our history, we used to use Flowspec ourselves to push out firewall rules in order to, for instance, mitigate large network-layer DDoS attacks. In this image we show outages as circles on Yesterday, Syria's Internet connectivity was cut off from the rest of the world. and reporting outages near-real-time since January 2018. Several of the other tier-1 providers took action, it appears at CenturyLink/Level(3)’s request, to de-peer their networks. 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