Cloudflare’s view of the Virgin Media outage in the UK

On April 4th, UK ISP Virgin Media experienced an internet outage affecting its subscribers. The outage was identified by Cloudflare Radar data showing a significant drop in Virgin Media traffic around midnight UTC and partial recovery at various intervals throughout the day. Virgin Media acknowledged both disruptions on their Twitter account and provided updates to affected customers, however, no root cause for the series of disruptions has been publicly released yet. Analysis of Border Gateway Protocol (BGP) activity suggests that the underlying cause may be BGP-related or related to problems with core network infrastructure.