IPv6 Link Local Address

ipv6-eui-64-format-ipcisco.com

What is IPv6 Link Local Address?

 

IPv6 has different address types. One of the important and widely used IPv6 Address type is IPv6 Link Local Address. Every IPv6 enable interfaces must have a Link-Local Address either with manual configuration or auto-address configuration. IPv6 Link Local Address is the address used between Point-to-Point interfaces and provide IPv6 Neigbor Discovery.

Point-to-point interfaces do not need a Global IPv6 Addres to communicate each other. Instead, they use IPv6 Link Local Addresses for point-to-point communication.And Router do not forward  these  Link-Local Addresses because they are used only on a single link.


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Link-Local-IPv6-Address


What is the Prefix of Link Local Address?

 

There are different prefixes are used with different  IPv6 Address Types. The Prefix of IPv6 Link Local Addresses is FE80::/10. All the other Prefixes used with IPv6 Address Types are given below:

  • Unspecified Address ::/128
  • Loopback ::1/128
  • Global Unicast (0010) 2000::/3
  • Unique Local Address FC00::/7
  • Link Local (1111 1110 10) FE80::/10
  • Multicast Address (1111 1111) FF00::/8

 

ipv6-prefix-ipcisco.com


How can we configure Link Local Address?

 

IPv6 Link Local Addresses can be configured in two ways. These Link-Local address configuration ways are :

  • Auto-Address Configuration
  • Manual Configuration

 

Auto-Address Configuration is done automaticaly with the help of Link Local Prefix (FE80::/10) and Interface Identifier in EUI-64 Format. This is the widely used method to configure a IPv6 Link Local Address.

The second way is Manual Configuration. In this configuration way, we use a manual router command to configure IPv6 Link Local Address. This command is “ip address link-local” in Cisco Routers.


Link-Local Auto-Address Configuration

 

 

IPv6 Link Local Auto-Address Configuration is the widely used Link-local address configuration method. With this method, IPv6 Interface ID with EUI-Format is used.


You can also test your IPv6 Knowledge on IPv6 Questions Page.


So, what is EUI-64 Format? Let’s explain.

Lesson tags: IPv6, link-local address
Back to: IPv6 Course > IPv6 Addressing Overview

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