Specifies that the per rule mask of swEgressACLIpv6RuleSrcIpv6Addr. The value of this object when not in use is the corresponding mask in the profile mask. Once the value of this object is modified, the per rule mask will take effect. This object is writeable only once.
Sources for this description
D-Link official switch MIBsD-Link MIB copies (LibreNMS/Observium Community)