Division 3.5 Resiliency
United Kingdom
The communication infrastructure shall offer high availability, in particular of the following components:
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backbone network,
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routing devices,
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points of presence,
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local loop connections (including physically redundant cabling),
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security devices (crypto devices, firewalls, etc.),
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all generic services (DNS, etc.),
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LNI and optional BLNI.
Network failover mechanisms shall be set up and, when required, coordinated with the application level to ensure maximum availability of the VIS as a whole.