Page 1434 - 5G Basics - Core Network Aspects

3 Signalling aspects

Some method can be achieved to improve the SDN efficiency. Permanent (rather than per-flow) or even pre-
configured flows could be achieved as well.

9.1 Information model

Information model matches the OpenFlow protocol specification and is slightly extended to support IP-in-IP
tunnels. It can accommodate multiple switches (using the datapath id to identify switches or using the IP
address of the datapath).
The data structure is specified as

– tunnel_sip_v6: The src-ipv6 address of tunnel (if any);
– tunnel_dip_v6: The dst-ipv6 address of tunnel (if any);
– tunnel_sip_v4: The src-ipv4 address of tunnel (if any);
– tunnel_dip_v4: The dst-ipv4 address of tunnel (if any);
– sip_v6: The src-ipv6 address of a packet or inner src-ipv6 address when packet type is IP-in-IP tunnel;

– dip_v6: The dst-ipv6 address of a packet or inner dst-ipv6 address when packet type is IP-in-IP
tunnel;
– sip_v4: The src-ipv4 address of a packet or inner src-ipv4 address when packet type is IP-in-IP tunnel;

– dip_v4: The dst-ipv4 address of a packet or inner dst-ipv4 address when packet type is IP-in-IP
tunnel;
– sip_v6_port: Source IPv6 TCP/UDP port number of the src-ipv6 packet (or inner src-ipv6 packet when
packet type is IP-in-IP tunnel);
– dip_v6_port: Destination IPv6 TCP/UDP port number of the dst-ipv6 packet (or inner dst-ipv6 packet
when packet type is IP-in-IP tunnel);
– src-port: Source TCP/UDP port number of a packet;
– dst-port: Destination TCP/UDP port number of a packet.

9.2 Operations

The supported operations match the OpenFlow operations (packet out, flow mod, and all the others) are
extended with IP-in-IP support, as follows:
– push_ipv4_header: Encapsulate the packet into an IP-in-IP tunnel, tunnel type is IPv4;
– pop_ipv4_header: De-capsulate the packet from IP-in-IP tunnel, tunnel type is IPv4;
– push_ipv6_header: Encapsulate the packet into an IP-in-IP tunnel, tunnel type is IPv6;
– pop_ipv6_header: De-capsulate the packet from IP-in-IP tunnel, tunnel type is IPv6.

1424