Session handling

A PFCP session is set up to control the creation, modification, and deletion of a bundle of PDRs. There is a single PFCP session per connected device.

Overview

PFCP sessions adhere to the following generic scope rules as defined in TS 29.244.

Identifiers (for example, FAR ID, QER ID, URR ID) are only unique within a session unless explicitly stated otherwise.
PDRs belonging to different sessions must not have the same PDI matching criteria.

PFCP messages are used to add, update, or delete rules as follows.

PFCP Session Establishment adds rules.
PFCP Session Modification can add, modify, and delete specific rules.
PFCP Session Deletion deletes all rules.

PFCP Session Modification and PFCP Session Report are used to send statistics or other information from the BNG-UP to the MAG-c.

PFCP session example

The following tables describe an example for a dual-stack PPPoE session, with session ID 100, IP anti-spoofing enabled, and single-session per MAC.

The following table describes the reused and top-level IEs, such as Traffic Endpoint IEs, QER IE, URR IE, and LCP PPP Connectivity IE. PDR and FARs for an example PPPoE session lists the PDRs with their accompanying PDR and related FAR. FARs are directly in the table for convenience.

Table 1. Top level IEs for an example PPPoE session
IE	Contents
PDN Type	`Ethernet`
Traffic Endpoint 1	`BBF) Logical Port = 1/2/3, S-TAG = 4, C-TAG = 5, MAC address = SOUR-00:00:5E:00:53:01`
Traffic Endpoint 2	`(BBF) Logical Port = 1/2/3, S-TAG = 4, C-TAG = 5, MAC address = SOUR-00:00:5E:00:53:01, (BBF) PPPoE Session ID = 100, UE IP Address = 192.0.2.2, 2001:db8:1::/56 (IPv6D=8), 2001:db8:2:1::/64`
Traffic Endpoint 3	`UE IP Address = 192.0.2.2, 2001:db8:1::/56 (IPv6D=8), 2001:db8:2:1::/64, Network-Instance = 'network'`
Traffic Endpoint 4	`Local F-TEID = v46, F-TEID CHOOSE`
QER 1	`QER Correlation ID = 1`
URR 1	`Measurement Method = VOLUM Reporting Triggers = PERIO Measurement Period = 600 //10m`
(BBF) PPP LCP Connectivity	`Traffic Endpoint ID = 1 (BBF) PPP LCP Magic Number = 0x12345678 (BBF) Verification Timers = interval 3000, count 3`
Nokia UP Aggregate Route	`Network-Instance = 'network' Framed-Route = 192.0.2.1/24 Framed-IPv6-Route = 2001:db8:1::/48 Framed-IPv6-Route = 2001:db8:2::/56`

Table 2. PDR and FARs for an example PPPoE session
PDR	PDI	FAR
PDR 1 (UP to CP)	`Source Interface = Access Traffic-Endpoint = 1 Ethernet Packet Filter: //PADI, PADR Ethertype = 0x8863, Ethernet Packet Filter: //PPP ctl Ethertype = 0x8864, (BBF) PPP Protocol = control Ethernet Packet Filter: //DHCPv6 Ethertype = 0x8864, (BBF) PPP Protocol = data SDF: Permit out 17 from any to any 547, Ethernet Packet Filter: //RS Ethertype = 0x8864, (BBF) PPP Protocol = data SDF: Permit out 58 from any to FF02::2`	`FAR 1 Apply Action = forward Forwarding Parameters: Destination Interface = CP-Function Outer Header Creation = GTP-U/UDP/IPv4, TEID 2000, IPv4 203.0.113.1, IPv6 2001:db8:1234::1`
PDR 2 (CP to UP) `Outer Header Removal = GTP/UDP/IPv4`	`Source Interface = CP Function Traffic-Endpoint = 4`	`FAR 2 Apply Action = forward Forwarding Parameters: - Destination Interface = Access - Linked Traffic Endpoint ID = 1`
PDR 3 (upstream data) `BBF Outer Header Removal = PPP/PPPoE/Ethernet QER ID = 1 URR ID = 1 Activate Predefined Rules = 'IPoE-HQoS'`	`Source-interface = access Traffic Endpoint = 2`	`FAR 3 Apply Action = forward Forwarding Parameters: - Destination-Interface = SGi-LAN - Network-Instance = 'network'`
PDR 4 (downstream data) `QER ID = 1 URR ID = 1 Activate Predefined Rules = 'IPoE-HQoS'`	`Source-interface = SGi-LAN Traffic-Endpoint = 3`	`FAR 4 Action = forward Forwarding Parameters: - Destination Interface = access - BBF Outer Header Creation = Traffic-Endpoint - BBF Outer Header Creation = Traffic-Endpoint - Linked Traffic Endpoint ID = 2 - (BBF) MTU = 1400`