8.2.192 L2TP Session Indications
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
The L2TP Session Indications IE shall be encoded as shown in Figure 8.2.192-1.
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Bits |
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|
Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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|
1 to 2 |
Type = 284 (decimal) |
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|
3 to 4 |
Length = n |
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|
5 |
Spare |
Spare |
Spare |
Spare |
Spare |
RENSA |
REDSA |
REUIA |
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|
6 to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.192-1: L2TP Session Indications
The following bits within Octet 5 shall indicate:
– Bit 1 – REUIA (Request UE IP Address): if this bit is set to "1", it indicates to the UP function that the UP function shall request the UE IP address from the LNS.
– Bit 2 – REDSA (Request DNS Server Address): if this bit is set to "1", it indicates to the UP function that the UP function shall request DNS Server Address from the LNS.
– Bit 3 – RENSA (Request NBNS Server Address): if this bit is set to "1", it indicates to the UP function that the UP function shall request NBNS Server Address from the LNS.
– Bit 4 to 8 – Spare, for future use, shall be set to "0" by the sender and discarded by the receiver.
NOTE: REDSA and RENSA are only applicable for PDN connections/PDU sessions with IPv4 address.