Network Technical Specifications


Ports, IPv4 and IPv6

All ports on the LU-CIX public exchange infrastructure are Ethernet and are available at the following speeds:

  • 1 Gbps (GE) - 1000BASE-LX
  • 10 Gbps (10GE) - 10GBASE-LR
  • 100 Gbps (100GE) – 100GBASE-LR4

Additionally, LU-CIX is able to aggregate GE and 10GE ports to provide higher bandwidth trunks.


MAC Layer

Ethernet framing

The LU-CIX infrastructure is based on the Ethernet II (or “DIX Ethernet”) standard. This means that LLC/SNAP encapsulation (802.2) is not permitted.


Frames forwarded to LU-CIX ports must have one of the following Ether types:

  • 0x0800 - IPv4
  • 0x0806 - ARP
  • 0x86dd - IPv6

One MAC address per port

Frames forwarded to an individual LU-CIX port shall all have the same source MAC address.

No proxy ARP

Use of proxy ARP on the router's interface to the Exchange is not allowed.

Unicast only

Frames forwarded to LU-CIX ports shall not be addressed to a multicast or broadcast MAC destination address except as follows:

  • broadcast ARP packets
  • multicast ICMPv6 Neighbour Discovery packets. This DOES NOT include Router Discovery packets.
  • multicast is only allowed on the separated Multicast VLAN

No link-local traffic

Traffic for link-local protocols shall not be forwarded to LU-CIX ports.
Link-local protocols include, but are not limited to, the following list:

  • IRDP
  • ICMP redirects
  • IEEE 802 Spanning Tree
  • Vendor proprietary protocols. These include, but are not limited to:
    - Discovery protocols: CDP, EDP - VLAN/trunking protocols: VTP, DTP
    Interior routing protocol broadcasts (e.g. OSPF, ISIS, IGRP, EIGRP)
  • PIM-SM
  • PIM-DM
  • ICMPv6 ND-RA
  • UDLD
  • L2 Keepalives

The following link-local protocols are exceptions and are allowed:

  • ARP
  • IPv6 ND