Identifies the version of the Second Internet routing Protocol within the network interface device at a host or end user location when requesting dual stack capability with IPv4 and IPv6 enabled.
NOTE 1: This field shall be used by the provider to identify the IP routing protocol version in order to interpret the protocol data sent from the customer’s equipment.
VALID ENTRIES:
4 = IPv4
6 = IPv6
NOTE 1: Valid entry of “4” is prohibited if IPAI field is “4”.
NOTE 2: Valid entry of “6” is prohibited if IPAI field is “6”.
USAGE: This field is conditional.
NOTE 1: Optional when the IPAI field is populated with “4” or “6”, otherwise prohibited.
DATA CHARACTERISTICS: 1 alpha/numeric character
EXAMPLE: 6