Resolved -
The connection between NY and Chicago has been repaired and has remained stable for multiple hours.
Aug 22, 14:27 UTC
Identified -
Due to a fiber cut between New York and Chicago, traffic has been diverted through Pittsburgh and other locations. Some traffic may be experiencing higher latency between PIT and NY/EWR due to the activation of high-latency but higher-capacity links.
Aug 22, 02:45 UTC
Completed -
The scheduled maintenance has been completed.
Aug 20, 21:00 UTC
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Aug 20, 15:00 UTC
Scheduled -
Teraswitch will be working with our fiber vendor and facility operator to migrate external connectivity to direct connections to our data center room in IAD1. This will improve latency and provide more direct connectivity to the IAD1 bare metal systems.
Aug 18, 17:41 UTC
Completed -
This maintenance is complete.
Aug 20, 02:58 UTC
In progress -
Scheduled maintenance is currently in progress. We will provide updates as necessary.
Aug 20, 02:00 UTC
Scheduled -
At the recommendation of our hardware vendor, we are upgrading the software of our DUB1 Internet routes and also doing a full reboot on them. This will be completed one at a time and no outage to customer traffic should be expected.
During this time, traffic may take less optimal routes while certain paths, transit, or IXs are offline. Normal operation will be restored shortly after. Each router should be offline for less than 15 minutes.
Aug 18, 19:31 UTC
Resolved -
Teraswitch has completed remediations to remove the bug-triggering configurations from our routers, as well as upgrading our route reflectors and adding diverse vendors on routing software. These stabilizations have proven reliable since July 30th, when we have not seen any additonal invalid packets (IS-IS LSA advertisements) inside our backbone.
We expect no further impacts from this issue.
Aug 18, 17:37 UTC
Investigating -
[This message has been deleted, a distinct incident has been opened instead.]
Aug 12, 04:01 UTC
Monitoring -
Since the initial impact, Teraswitch’s Network Engineering team has identified the instability as a routing software failure triggered during a routine configuration change. We have removed the triggering condition and implemented safeguards to prevent recurrence. The network remains stable while we complete software upgrades and permanent remediation.
Our current timeline of events is that the instability was triggered at approximately 19:09:21–27 UTC on July 29th 2026, and lasted for ~5 minutes.
More updates and a complete RCA will be released in future updates.
Jul 31, 14:33 UTC
Identified -
Teraswitch is currently working on mitigations related to this issue, although traffic issues have settled.
At this time, it appears a bulk of the high-capacity US to EU cables had a fault around the same time. Our NY to London path, which had been cut and resolved earlier today, went down again, and our Ashburn to Frankfurt path suffered an outage around the same time.
At this time, the network has stabilized and we are working to ensure any additional events are not as impactful to traffic.
Jul 29, 19:35 UTC
Investigating -
Teraswitch is looking into general Internet Instability.
Jul 29, 19:15 UTC