Understanding IPV6 - (Part 3)

By: Daniel Imbellino
Updated: Feb 28, 2013

Some of the scope values you will come across with IPv6 multicast addresses are:
Node Local Scope: value is 1 FF01::1
Global Scope (for sending multicast transmissions across networks) value is 14 FF01::E
Link Local Scope: value is 2 FF02::2
Site Local Scope: value is 5 FF05::2
Reserved Scope: value is 15

Here’s an example “Node Scope Multicast”: FF0x0:0:0:0:0:1 Notice how the prefix begins with an FF, and the a 1 is affixed to the end of the address indicating the type of scope being used.
Here’s an example “Global Scope Multicast”: FF0x0:0:0:0:F The F represents the scope of this multicast is global.

While a unicast address is used to send data to one individual workstation, and a multicast address is used to send data to all workstations or a set of workstations within a given network, there are also anycast addresses. Anycast addresses only send data to the nearest workstation, instead of all workstations as with a multicast transmission would do. To use an any cast address, you just assign the same unicast address to multiple workstations, then the stations can send data to each other as an anycast request. This helps with load balancing across IPv6 networks, say if a router went down, then a workstation could retrieve the information that it needs through another workstation that is connected to a different router.