Cisco routers down Japan

A MAJOR OUTAGE in an NTT network in Japan on Tuesday was caused by between 2,000 and 4,000 Cisco routers.

The routers went down for about seven hours in the NTT East network after a switchover to backup routes triggered the routers to rewrite routing tables.

According to Network World, the outage disconnected millions of broadband Internet users across most of eastern Japan.

Cisco says was working closely with NTT East to identify the specific cause of the outage and help prevent future occurrences.

However at the moment it is not sure what could have caused the problem.

NTT East and NTT West are trying out a core router upgrade, according to the report. NTT East got the Cisco gear to try out while NTT West got Juniper core routers to evaluate.

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