Description

One of our third-party providers has advised that they need to perform maintenance at Goswell Road (GOS) which will impact our Dark Fibre link from Goswell Road (GOS) to Dartford (DA2). During this maintenance, we will have periods of reduced resiliency. The 3rd party engineers have identified a damaged section of cable in London that requires replacement, to avoid any further unplanned outages relating to the damage found. Custodian’s networking team will be working closely with the third party at all times. [Layer-3 IP Transit Services] Our core IP Transit network automatically re-routes all protected services when a fibre break is detected, and brings the failed fibre back into service only once it has been stable and error free for a period of time. As such, all Layer-3 services will have possible path switches at start and end of this work, depending on destination path selected, with potential changes in latency to some destinations, no significant disruption is expected to any IPT services at any location. [Layer-2 MPLS/VPLS Services] Standard Ethernet Services which have a path between GOS<->DA2 may experience an outage. Protected Ethernet Services which have a path between GOS<->DA2 may see a switch/re-route during this work; no significant disruption is expected. Diverse Ethernet Services which include a path between GOS<->DA2 may see the loss of one member; no parallel outages of both feeds are expected. [Wavelength Services] Services between GOS<->DA2 may experience an outage. This maintenance has been scheduled under ticket: [CDC-ID: #255923]

Components

Global IP Transit, MPLS/VPLS/L2VPN, DWDM/Wavelength

Locations

DA2

Schedule

April 15, 2026 21:00 - April 16, 2026 04:00 BST