5.16 Framed Routing

29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS

Framed routing allows to support an IP network behind a UE, such that a range of IP addresses or IPv6 prefixes is reachable over a single PDU session, e.g. for enterprise connectivity. Framed routes are IP routes behind the UE. The UPF advertizes relevant IP routes to receive packets destined to these destination IP addresses or IPv6 prefixes and to forward these packets over the PDU session. See clause 5.6.14 of 3GPP TS 23.501 [28], IETF RFC 2865 [37], IETF RFC 3162 [38]) and the Framed-Route, Framed-Routing and Framed-IPv6-Route AVPs specified in 3GPP TS 29.061 [39] and 3GPP TS 29.561 [49].

Framed routing is defined only for PDN connections and PDU sessions of the IP type (IPv4, IPv6, IPv4v6).

A UPF may indicate support of framed routing by setting the FRRT flag in the UP Function Features IE. If so, the CP function may include Framed-Route IEs, the Frame-Routing IE and Framed-IPv6-Route IEs in PDRs to describe framed routes associated to the PDU session.

The UP function shall:

– match the source IP address of packets with IP Address(es) or IPv6 prefixes as indicated in the the Framed-Route IE or Framed-IPv6-Route IE if it is provisioned in a UL PDRs;

– match the destination IP address of packets with IP Address(es) or IPv6 prefixes as indicated in the the Framed-Route IE or Framed-IPv6-Route IE if it is provisioned in a DL PDRs.