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University Data Network (UDN) services

The backbone data network provides a wide variety of connectivity services for University institutions. The network itself is known as the University Data Network and often referred to as the 'UDN' (historically the "Cambridge University Data Network [CUDN]).

Note: Much of the information here is written for IT staff with a background in data networking; it is not likely to be of much interest to the casual user.

At a basic level, the UDN connects institutions within the Collegiate University with each other, as well as central services provided by the UIS and other institutions (such as central email and filestore services), and also to Janet. Janet is the UK education and research network, which interconnects higher and further education establishments within the UK and provides connectivity to these organisations to the internet through a number of providers.

However, the UDN also offers a number of additional services, as well as basic network connectivity. These services are described here (along with links to more information):

  • Routed IP data network connection
    The basic, routed IPv4 and (optional) IPv6 connection to the University backbone network and Janet / the internet. An institution's main staff, student and research network will typically use this. A connection has a number of options. It can:
  • MPLS virtual private network (VPN) service
    The MPLS service allows private networks to be built using the existing UDN infrastructure but traffic to be kept logically separate from the normal internet-routed space, except where explicitly interconnected.  This is useful to support wholly-private networks (such as a security system) or internal institutional networks to be extended over the UDN backbone.
  • Infrastructure service networks
    These support infrastructure other than traditional computer connections for equipment such as CCTV, BMS (Building Management Systems) as well as the University Telephone Network.
  • VLAN services
    To support switched / layer 2 connectivity, the UDN supports a number of VLAN-based services.

Last updated: 21st May 2019

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If you have any enquiries regarding UIS network services, or other University network topics, please send an email to:

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