DC1 & DC2 Internet Transit Issue 16:21 18/01/11
Posted by Thomas Brown on 18 January 2011 05:16 PM

Between 16:21 and 16:30 today some customers experienced issues with Internet transit from DC-1 and DC-2 in Derby.

Engineers are currently investigating the cause.

Update 18/01/2011 17:35 – Engineers have isolated the issue to an Ethernet link between one of our two Core routers, our traffic shaper, and one of our Core Switches – all located within the Derby DC. We are currently studying logs, and information from our Network Management Systems in an effort to identify the root cause. The issue caused a high percentage of packet loss which resulted in OSPF neighbour sessions flapping, which in turn caused Internet Transit connectivity issues for collocated customers.

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Engineers plan to perform maintenance on our “MPLS Access” Layer-2 Edge Ethernet Switches at DC-2 Derby and DC-3 Wakefield Data Centres. The purpose of this planned maintenance is to perform a software upgrade on the switches in order to enable new features.

This maintenance will be performed in two phases.


Layer-2 MPLS Ethernet Interconnects, between our DC’s or DC to a POP, terminating on a “MPLS Access” Switch at Derby and/or Wakefield Data Centres will be impacted during this maintenance work. We expect two service outages, with each being up to 5 minutes.  However these services will be deemed “at risk” until the maintenance work is completed. Colocation customers directly affected by this work have been notified via email (07/01/11).

Maintenance Window #1

Thursday 20th January 06.00 – 06.30

Maintenance Window #2

Friday 28th January 06.00 – 06.30

Our network operations engineers closely monitor the work and will do everything possible to minimise any inconvenience to you.  If you have any problems with your connection after this time, or if you have any questions regarding the maintenance at any point, please call Technical Support at 0845 413 3800 or visit

While it is important for Server Centre to perform maintenance such as this to ensure the quality of our network, we do everything possible to minimize any inconvenience to our customers.  We appreciate your patience and welcome any feedback.


Server Centre Technical Support

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