Netnod IX technical information
Common Switching Equipment
In Stockholm the exchange points consists of two large Ethernet switches located in two main safe facilities, all operated by Netnod. There is also a couple of co-location sites where Netnod has either switches or DWDM-equipment to backhaul traffic to the two main sites.
All of the installed infrastructure equipment has redundancy to protect from electrical breakdown for high reliability demands. The main sites are called STH-A and STH-B. There is no direct connection between the switches in the different locations. The switches and other common equipment are physically protected according to current rules and recommendations from the Swedish regulator (PTS).
The exact locations of the two main sites are not published.
In Stockholm Netnod also have on-site presence on the larger commercial co-location-sites. On those sites two local cross-connects are needed to connect. These sites also have a high degree of physical access-safety, redundant power and firesuppresion.
In Gothenburg, Malmö, Sundsvall and Luleå the exchange point consists of one switch located in a safe facility, operated by Netnod. All installed infrastructure equipment has redundancy from electrical breakdown for high reliability demands. The two sites in Copenhagen that are, together with VG4 and NNB, forming COMIX are located at commercial colocation companies. These sites also have a high degree of physical access-safety, redundant power and firesuppresion.
In Gothenburg, Sundsvall and Luleå the exchange points are single, standalone, non- interconnected switches.
In Malmö/Copenhagen (COMIX) the switches on the five different sites are interconnected creating a distributed exchange point.
In Stockholm there are two standalone, non-interconnected switches.
Network connections in Stockholm
There are two ways to connect to the switchfabrics in Stockholm:
1. Two separate single mode fibre-optic cables, provided by Netnod, connect the two switches with the address/addresses of the ISP.
2. Two on-site connections at the datacenters where Netnod is present throught the datacenter MMR’s.
The ports on the switches will be configured to allow only the connected customers interface-MAC-addresses. The MAC’s of the customers interfaces needs to be provided to Netnod in advance.
The exchange points consist of two different VLANs on each main switch. One VLAN handles standard-sized ethernet frames (MTU <1500 bytes) and one handles Ethernet Jumbo frames with MTU-size 4470 bytes. The VLANs are implemented according to IEEE802.1Q. The VLAN supporting 1500 bytes MTU is VLAN #215 and VLAN for MTU-size 4470 is VLAN #216 on STH-A. For STH-B the VLAN supporting 1500 bytes MTU is VLAN #15 and VLAN for MTU-size 4470 is VLAN #16. The customer has to decide which MTU-size to be used, so as to connect to the correct VLAN. As there is no connection within the exchange points between the different VLANs, a customer that communicates with parties using different MTU-sizes MUST have a connection to each VLAN.
All Netnod exchange points support IP version 4 and version 6. There are up to four different IP-networks used on each switch-fabric, two for IPv4 (MTU 1500 and MTU4470) and two for IPv6 (MTU1500 and MTU4470). Which means that in Stockholm there are 8 IP-networks available in total. Netnod will assign and distribute IP addresses to the connected customers.
Peering between an ISP's routers through the exchange point will be done via BGP4. Any kind of tunneling is explicitly forbidden.
Multicast traffic is supported over the exchange points.