News
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Jun 29 |
[Core Network] EMERGENCY Maintenance windows 6-8th July 2018
Posted by David Croft on 29 June 2018 01:07 PM |
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Please be advised of the following maintenance windows scheduled on our core network: Start date: Friday, 6th July 2018 Start time: 18:00 BST (UTC+0100) End time: 04:00 BST (UTC+0100) Saturday Start date: Saturday, 7th July 2018 Start time: 14:00 BST (UTC+0100) End time: 04:00 BST (UTC+0100) Sunday Start date: Sunday, 8th July 2018 Start time: 14:00 BST (UTC+0100) End time: 04:00 BST (UTC+0100) Monday Purpose: We will be replacing core network devices to increase capacity and prevent a recurrence of the outage suffered on 22nd May. Services affected: All Impact: LOW - Prior to 20:00 BST on each date No works will take place that are known to have a possibility of causing any service degradation, however the network is "at-risk" due to preparatory work taking place in core network PoPs. MEDIUM - After 20:00 BST on each date No works that will take place that are known to have any possibility of causing a total network outage, however works will be carried out that will cause a reduction of resilience or the removal of a single PoP from service. HIGH - After 23:59 BST on each date Works that have any possibility of triggering the cascading failure will be reserved to take place after midnight. Due to the nature of the instability suffered on 22nd May the maintenance has been carefully developed to categorise works according to both their expected (normal) risk and potential (due to the current situation) risk and allocate them to the maintenance windows as detailed above. This has been developed conservatively due to the unexpected cascading nature of the previous failure. Prior to 20:00 BST on each date, it is anticipated that no customer suffers loss or degradation of service. After 20:00 BST it is anticipated that single-homed customers will experience loss of service, however customers with resilience options will fail over to alternate paths. After 23:59 BST it is anticipated that all customers will suffer loss of service. In all cases we will endeavour to keep periods of disruption to a minimum. Please note: These maintenance windows are being declared as EMERGENCY without the normal notice period due to the need to perform these works urgently in order to prevent a recurrence of the outage of 22nd May. The immediate goal of this work is to stabilise the network to prevent further a network outage. The second, non-essential part of the upgrades will take place in August. Regards, David Croft | |
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