Zyxel OLT2412 [76/326] Global address

Chapter 8 IPv6

OLT2412 User’s Guide

compose the network address. The prefix length is written as “/x” where x is a number. For

example,

2001:db8:1a2b:15::1a2f:0/32

means that the first 32 bits (

2001:db8) is the subnet prefix.

Interface ID

In IPv6, an interface ID is a 64-bit identifier. It identifies a physical interface (for example, an

Ethernet port) or a virtual interface (for example, the management IP address for a VLAN). One

interface should have a unique interface ID.

Link-local Address

A link-local address uniquely identifies a device on the local network (the LAN). It is similar to a

“private IP address” in IPv4. You can have the same link-local address on multiple interfaces on a

device. A link-local unicast address has a predefined prefix of fe80::/10. The link-local unicast

address format is as follows.

Table 29 Link-local Unicast Address Format

Global Address

A global address uniquely identifies a device on the Internet. It is similar to a “public IP address” in

IPv4. The global address format as follows.

Table 30 Global Address Format

The global ID is the network identifier or prefix of the address and is used for routing. This may be

assigned by service providers.

The subnet ID is a number that identifies the subnet of a site.

Multicast Address

In IPv6, multicast addresses provide the same functionality as IPv4 broadcast addresses.

Broadcasting is not supported in IPv6. A multicast address allows a host to send packets to all hosts

in a multicast group.

1111 1110 10 0 Interface ID

10 bits 54 bits 64 bits

001 Global ID Subnet ID Interface ID

3 bits 45 bits 16 bits 64 bits