Siemens SIMATIC NET System Manual page 36

Basics of communication with Industrial Ethernet
1.3 Technologies of Industrial Ethernet
Link
A link is, according to IPv6 terminology, a direct layer 3 connection within an IPv6 network.
Neighbor
Two network nodes are called neighbors when they are located on the same link.
IPv6 interface
Physical or logical interface on which IPv6 is activated.
Path MTU
Maximum permitted packet size on a path from a sender to a recipient.
Path MTU discovery
Mechanism for determining the maximum permitted packet size along the entire path from a
sender to a recipient.
LLA
Link local address FE80::/10
As soon as IPv6 is activated on the interface, a link local address is formed automatically.
Can only be reached by nodes located on the same link.
ULA
Unique Local Address
Defined in RFC 4193. The IPv6 interface can be reached via this address in the LAN.
GUA
Global Unicast Address The IPv6 interface can be reached through this address, for
example, via the Internet.
Interface ID
The interface ID is formed with the EUI-64 method or manually.
EUI-64
Extended Unique Identifier (RFC 4291); process for forming the interface ID. In Ethernet, the
interface ID is formed from the MAC address of the interface. Divides the MAC address into
the manufacturer-specific part (OUI) and the network-specific part (NIC) and inserts FFFE
between the two parts.
Example:
MAC address = AA:BB:CC:DD:EE:FF
OUI = AA:BB:CC
NIC = DD:EE:FF
EUI-64 = OUI + FFFE + NIC = AA:BB:CC:FF:FE:DD:EE:FF
Scope
Defines the range of the IPv6 address.
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System Manual, 09/2019, C79000-G8976-C242-10
Industrial Ethernet