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).
帧路由仅定义IP类型的PDN连接和PDU会话。
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 DL PDRs to describe framed routes associated to the PDU session.
UPF可以通过在UP Function Features IE中设置FRRT标志来指示对帧路由的支持。如果是这样，CP功能可以包括Framed-Route IE、Frame-Routing IE和DL PDR中的Framed-IPv6-Route IE，以描述与PDU会话相关联的帧路由。