8.2.129 Alternative SMF IP Address
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
The Alternative SMF IP Address IE shall contain an IPv4 and/or IPv6 address. It shall be encoded as shown in Figure 8.2.129-1.
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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 = 178 (decimal) |
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3 to 4 |
Length = n |
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5 |
Spare |
PPE |
V4 |
V6 |
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p to (p+3) |
IPv4 Address |
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q to (q+15) |
IPv6 Address |
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m to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.129-1: Alternative SMF IP Address
The following flags are coded within Octet 5:
– Bit 1 – V6: If this bit is set to "1", then the IPv6 address field shall be present in the Alternative SMF IP Address, otherwise the IPv6 address field shall not be present.
– Bit 2 – V4: If this bit is set to "1", then the IPv4 address field shall be present in the Alternative SMF IP Address, otherwise the IPv4 address field shall not be present.
– Bit 3 – PPE (Preferred PFCP Entity): If this bit is set to "1", then the alternative SMF IP address shall be used by the UPF as a preferred address when reselecting a PFCP entity as specified in clauses 5.22.2 and 5.22.3.
– Bit 4 to 8 Spare, for future use and set to "0".
Octets "p to (p+3)" or "q to (q+15)" (IPv4 address / IPv6 address fields), if present, shall contain the address value.