Nepal experienced a significant disruption to its internet control plane visibility for over seven hours on September 1. The event began at approximately 17:10 UTC and lasted until 00:30 UTC on September 2, affecting the Border Gateway Protocol (BGP) signal.
Technical Details
The disruption recorded a severity score of 1,109, with the primary impact observed on the BGP median signal. This signal measures the control plane visibility for internet routing prefixes, indicating a reduction in the number of network paths advertised and visible globally. The event duration was 7.3 hours.
Concurrently, other network health indicators showed deviations. The gtr-norm signal, which measures traffic volume against a forecasted baseline, dropped by 48% from its peak. The merit-nt signal, a proxy for aggregate connectivity based on backscatter measurements, showed a 32% drop. The ping-slash24 signal, which measures ICMP reachability across IPv4 /24 prefixes, showed a minimal 2% drop in reachability.
The cause has not been publicly attributed.
Connectivity was reported restored by the end of the observation period.
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