Description
2.6 Interface identifiers and addresses
SCALANCE XM-400/XR-500 Command Line Interface (CLI)
46 Configuration Manual, 06/2016, C79000-G8976-C252-11
IP addresses of the interface 4 IP addresses Multiple IP addresses
• LLA: A link local address (formed automatically)
fe80::/128 per interface
• ULA: Several unique local unicast addresses per inter-
face
• GUA: Several global unicast addresses per interface
Header
• Checksum
• Variable length
• Fragmentation in the
header
• No security
• Checking at a higher layer
• Fixed size
• Fragmentation in the extension header
Only endpoint of the communication
Quality of service Type of Service (ToS) for
prioritization
The prioritization is specified in the header field "Traffic
Class".
Types of frame Broadcast, multicast,
Multicast, unicast, anycast
Identification of DHCP cli-
ents/server
Client ID:
MAC address
DUID + IAID(s) = exactly one interface of the host
DUID = DHCP unique identifier
Identifies server and clients uniquely and should not change,
not even when replacing network components!
IAID = Identity Association Identifier
At least one per interface is generated by the client and re-
mains unchanged when the DHCP client restarts
Three methods of obtaining the DUID
• DUID-LLT
• DUID-EN
• DUID-LL
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