Identifies the version of the Internet Routing Protocol within the network interface device at a host or end user location.
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
M = IPv4 - mapped IPv6
USAGE: This field is optional.
DATA CHARACTERISTICS: 1 alpha/numeric character
EXAMPLE: 4