Hash Key Type 14: 3-Tuple GTPv0

Feature Set N-ANL11

product_line_custom
Intel® PAC
Napatech SmartNIC
category
Feature Description

Hash key data

Hash key type 14 is a 3-tuple where the hash key data is the contents of these packet header fields:

  • 32-bit IPv4 / 128-bit IPv6 source address
  • 32-bit IPv4 / 128-bit IPv6 destination address
  • 16-bit GTPv0 flow label

The hash key data is not sorted for hash key type 14. For IPv4 packets, hash key data word 0 is always the IPv4 source address, and hash key data word 4 is always the IPv4 destination address. For IPv6 packets, hash key data words 0 – 3 are always the IPv6 source address, and hash key data words 4 – 7 are always the IPv6 destination address. This means that frames sent from IP address A to IP address B will generate a hash value different from frames sent from IP address B to IP address A (if address A and B are different).

The GTPv0 flow label is always placed in the lower 16 bits of hash key data word 8. The rest of this word is all zeros.

For IPv4 packets, hash key data words 1 – 3, 5 – 7 and 9 are all zeros for hash key type 14. For IPv6 packets, hash key data word 9 is all zeros for hash key type 14.

Illustration for IPv4 packets

This figure illustrates hash key type 14 for IPv4 packets.

3-tuple GTPv0 hash key for IPv4

Illustration for IPv6 packets

This figure illustrates hash key type 14 for IPv6 packets.

3-tuple GTPv0 hash key for IPv6

Validity

Hash key type 14 is valid for frames containing an IPv4 packet or an IPv6 packet with a GTPv0 packet as payload.