caAclIPV6ACESourcePrefixLength 1.3.6.1.4.1.9.9.808.1.1.3.1.5

This object determines the number of bits in the field caAclIPV6ACLSourceAddress to be checked. If the value of this object is 0, then the source address in the packet must match caAclIPV6ACESourceAddress exactly for the ACE action to be taken.