tmnxOspfAreaAggrPrefixLength 1.3.6.1.4.1.6527.3.1.2.36.21.1.5

The value of tmnxOspfAreaAggrPrefixLength specifies the length of the prefix (in bits). An IPv6 prefix cannot be shorter than 3 bits. The 0, 1, and 2 prefix lengths are only valid for IPv4 addresses.