8.144 SGi PtP Tunnel Address
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
SGi PtP Tunnel Address is coded as depicted in Figure 8.144-1.
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Bits |
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Octets |
8 |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
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1 |
Type = 213 (decimal) |
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2 to 3 |
Length = n |
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4 |
Spare |
Instance |
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5 |
Spare |
Port |
V6 |
V4 |
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m to (m+3) |
IPv4 address |
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p to (p+15) |
IPv6 address |
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q to (q+1) |
Port Number |
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k to (n+4) |
These octet(s) is/are present only if explicitly specified |
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Figure 8.144-1: SGi PtP Tunnel Address
The following flags are coded within Octet 5:
– Bit 1 – V4: If this bit is set to "1", then the IPv4 address field shall be present, otherwise it shall be absent. Bit 2 shall be set to "0" when Bit 1 is set to "1".
– Bit 2 – V6: If this bit is set to "1", then the IPv6 address field shall be present, otherwise it shall be absent. Bit 1 shall be set to "0" when Bit 2 is set to "1".
– Bit 3 – Port: If this bit is set to "1", then the Port Number field shall be present, otherwise it shall be absent.
When the IPv4 address field is present, octets m to (m+3) shall contains an IPv4 address. Bit 8 of Octet m represents the most significant bit of the IPv4 address and bit 1 of octet (m+3) the least significant bit.
When the IPv6 address field is present, octets p to (p+15) shall contain the IPv6 Prefix and Interface Identifier. Bit 8 of octet p represents the most significant bit of the IPv6 Prefix and Interface Identifier and bit 1 of octet (p+15) the least significant bit.
When the UDP port field is present, octets q to (q+1) shall contain a UDP port number. Bit 8 of Octet q represents the most significant bit of the port number and bit 1 of octet (q+1) the least significant bit.