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FAQ

What is an Internet eXchange (IX)?
What is the topology of the DIX?
Who can connect to the DIX
What do I get when I connect my network to the DIX?
What is Peering?
What is a private peering?
Are private peerings allowed at the DIX?
What is Transit?
Can I get Transit via the DIX?
What is needed to join?
Can I put servers on the DIX?
What happens if the power fails at the DIX, or the switch fails?
Will the Internet in Denmark stop in case of a failure on the DIX?
How is power protected at the DIX?
Is it possible to rent space from the DIX to locate other than networking equipment?

What is an Internet eXchange (IX)?
An Internet eXchange is a place where Internet Service Providers (ISP) connects and exchange traffic. For example if a customer from ISP A wants to visit a homepage located on a server on the network managed by ISP B, the traffic will typically flow from ISP A to the IX and further on to the server on ISP Bs network.

An IX can be considered as a piece of "Neutral network" inter-connecting ISPs.

What is the topology of the DIX?
At present, the DIX has one switch at UNI-C Lyngby and two switches in different rooms in Interxion, Ballerup, connected with dark fibre. The back-to-back connection is presently 2x10Gbps and will be upgraded as the need arises.

It is possible to request two (or more) ports in Lyngby respectively in Ballerup to be bundled in an etherchannel.

Who can connect to the DIX
Any ISP having an Autonomous System (AS) number. In Europe this is handled by RIPE. You can read more about AS numbers on http://www.ripe.net/ripe/docs/asn-assignment.html

What do I get when I connect my network to the DIX?
You get a port on the DIX-switch, and an IP-Address on the neutral network. This will enable you to establish peerings with the other members on the DIX.

You do *not* get general access to the Internet by connecting to the DIX.

What is Peering?
Peering is the term used for exchanging traffic on the DIX. Peering is a bilateral agreement between two ISPs. There is no rule that you have to peer with all other ISPs on the DIX. It is up to the individual ISP who they want to peer with.

What is a private peering?
Private peering is the term used for connections between two ISP's going directly from one ISP to the other ISP. That is not passing the DIX switch in this case.

Are private peerings allowed at the DIX?
Yes! you are free to make as many private peerings with other ISPs at the DIX, as you want. Transit traffic is *only* allowed on a private peering.

What is Transit?
Transit is the term used for the part of your traffic that is being transported by others to destinations outside their network. International traffic is an example of transit traffic.

Can I get Transit via the DIX?
No! It is not allowed to get transit traffic via the DIX switch. The DIX switch is only to be used for peering traffic. Transit traffic providing by an ISP present at the DIX is to be exchanged on a private peering (that is a cable directly connected from your router/network to the ISP provding transit).

What is needed to join?
First of all you need an AS number. Then you must fill out a "Connection Agreement" which is the contract between you and i2 as the manager of the DIX.

You need to get a transit agreement with a transit provider to get international connection. Then you need to establish peerings with all the providers that agree to peer with you. For this purpose we have a "Peering Agreement" which can be used, but it is not mandatory to use this if you agree with the peering partner to do otherwise.

Finally you need to have a connection from a PoP in your network to the DIX. Typically you will have a router located at the DIX, which handles the BGP routing. If you have a nearby PoP, you are allowed to connect to the DIX switch without having any equipment installed at the DIX. This does however not change the yearly DIX fee.

Can I put servers on the DIX?
No! The DIX is only for ISPs exchanging traffic with each others.

Anyone claiming they have servers directly connected to the DIX are wrong! Servers can be located very near to the DIX both physically and network distance (one hop away), but not on the DIX network.

What happens if the power fails at the DIX, or the switch fails?
Should the power fail at the DIX or the main DIX switch fail, the peerings between the providers will of course disappear. Since no operator is allowed to have transit traffic (which could be international traffic) flowing on the DIX switch, then all national traffic would automatic be re-routed on each providers international link in case of a failure. Some providers may also have other national peerings in Denmark, and the traffic could then flow that way. When the DIX returns to normal operation, traffic would again automatic be routed via the DIX.

Will the Internet in Denmark stop in case of a failure on the DIX?
NO! As explained above there will perhaps be a short interrupt while traffic is being automatic re-routed to other links. Also traffic may be slower than usual, if it is being routed via international links instead of via national links.

How is power protected at the DIX?

The DIX has a full no-break powersystem with battery backup for about 15 minutes and a diesel generator to supply the entire building with power in the case of failures in the power grid.

There are three different powersources to use in the DIX. One is protected with batteries and diesel generator, another without the battery but only with the generator, and the last is a unprotected supply from a different high voltage transfomer.

Is it possible to rent space from the DIX to locate other than networking equipment
NO! Anyone claiming that they do, are wrong! It is possible to rent serverspace in the same building, but it has absolutely nothing to do with the DIX!