8.2.97 Proxying
29.2443GPPInterface between the Control Plane and the User Plane nodesRelease 17TS
The Proxying IE shall be encoded as shown in Figure 8.2.97-1. It specifies if responding to Address Resolution Protocol (ARP) (see IETF RFC 826 [32]) and / or IPv6 Neighbour Solicitation (see IETF RFC 4861 [33]) as specified in clause 5.6.10.2 of 3GPP TS 23.501 [28], functionality for the Ethernet PDUs is performed in UPF.
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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 = 137 (decimal) |
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3 to 4 |
Length = n |
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|
5 |
Spare |
INS |
ARP |
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6 to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.2.97-1: Proxying
The following flags are coded within Octet 5:
– Bit 1 – ARP: If this bit is set to "1", then responding ARP is performed in UPF based on local cache information.
– Bit 2 – INS: If this bit is set to "1", then responding to IPv6 Neighbour Solicitation is performed in UPF based on local cache information.
– Bit 3 to 8 – spare and reserved for future use.