Scores of web sites were knocked offline on Monday afternoon after Juniper Network routers running JunOS software versions 10.2 and 10.3 reset their Border Gateway Protocol (BGP) connections.
The issue appeared to affect several internet service providers and network firms, with Level3 one notable firm affected after it confirmed the issue was caused by routers on its network.
"Shortly after 9am Eastern Time, Level 3's network experienced several outages across North America and Europe relating to some of the routers on our network," it said.
"Our technicians worked quickly to bring systems back online. At this time, all connection issues have been resolved, and we are working hard with our equipment vendors to determine the exact cause of the outage and ensure all systems are stable."
Late Monday afternoon, the company began notifying customers that the issue had been resolved.
"We can now confirm that the connectivity issues experienced this afternoon have been resolved as of approximately 16:00," the company said.
"We can also confirm that the root cause of the incident was an outage within the Level 3 IP Transit network causing intermittent connectivity to certain destinations."
Juniper confirmed the issue was caused by its routers and that it was working with those affected to resolve the problem.
"This morning, Juniper learned of a Border Gateway Protocol edge router issue that affected a small percentage of customers," said vice president of services, support and operations Mark Bauhaus.
"A software fix is available, and we've been working with our customers to immediately deploy the fix."
Link shortening firm Bit.ly was just one site to be affected, and the company took to Twitter to blame its availability problems on Level3's network.
"Bit.ly is operating normally, but there is a general connectivity issue at Level3 affecting multiple ISPs and networks," it said.
The incident is likely to prove embarrassing for both companies, and comes after Level3 completed the acquisition of rival Global Crossing for $1.15bn.
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