Hash key type 10 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
32-bit GREv0 key
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).
Note: The source and destination addresses can be swapped (see Tuple Swap).
Hash key data word 8 is always the GREv0 key.
For IPv4 packets, hash key data words 1 – 3, 5 – 7 and 9 are all zeros for hash key type
10. For IPv6 packets, hash key data word 9 is all zeros for hash key type 10.
Illustration for IPv4 packets
This figure illustrates hash key type 10 for IPv4 packets.
Note: The Key field plus either the
Checksum field or the Offset field must be present in order for the frame
decoder to recognize a GREv0 packet.
Illustration for IPv6 packets
This figure illustrates hash key type 10 for IPv6 packets.
Note: The Key field plus either the
Checksum field or the Offset field must be present in order for the frame
decoder to recognize a GREv0 packet.
Validity
Hash key type 10 is valid for frames containing an IPv4 packet or an IPv6 packet with a
GREv0 packet as payload.