This will affect uk1-pn, uk1-adj and a very small number of dedicated server customers.

We are going to be performing some maintenance soon, the details are as follows.Maintenance Type:                  Network Maintenance
Expected effect on your service:  No network access
Expected duration:                30 seconds
This will occur between:          23:00 on Tuesday 20th Oct 2009 and 05:00 on Wednesday 21st Oct 2009  (All times are UK)
Area affected:                    RSH.North from our Maidenhead Datacentre

The nature of the maintenance window is to reconfigure the core routers as a VSS-1440 cluster. This will provide an increase in redundancy for your service and will provide additional capacity in terms of port aggregation and network resilience. The migration has been carefully planned and we are using the multiple uplinks that each rack has to stage the process and minimise the impact to service.

All of the racks in our Spectrum House data centre have two uplinks. During the 30 second window each rack will, in-turn, have one uplink migrated to the chassis that is configured as a cluster. The link connected to the existing configuration will then be shut down.
Once all the racks are connected to the cluster chassis, the secondary chassis will be configured as part of the cluster. At this point the secondary ports will be brought back online and a fully redundant configuration will once again be achieved.

The issues previously experienced with the Cisco systems have been completely ironed out and we are confident that this work will be the last major network maintenance for the foreseeable future. We have, however, prepared the process so that a complete rollback is quick and easy to achieve should it be required.

We apologise for any inconvenience this may cause and we would like to reiterate at this time that the patience shown by all clients continues to be much-appreciated. Please do not hesitate to contact us if you have any queries or questions regarding this maintenance window.