This notification signifies that the shortage of available IPv6 addresses for a particular prefix or link is over and is generated when the number of free addresses for that prefix or link reaches or exceed value specified by cnrdhcpv6Threshold. This notification will only be generated when exceeding the threshold specified by cnrdhcpv6Threshold for the first time. When ciscoNetRegDhcpv6AddressShortageStart is generated, it enables this notification to trigger again the next time the number of free addresses for that prefix or link reaches or exceed value specified by cnrdhcpv6Threshold. At the time this event is triggered, cnrdhcpv6LinkName indicates the name of the link or prefix, cnrdhcpv6FreeAddressValue provides the count of the addresses, cnrdhcpv6Threshold specifies the configured percentage that was crossed. In case cnrdhcpv6ThresholdType is of type 'prefix' then cnrdhcpv6PrefixAddress and cnrdhcpv6PrefixLength indicate the address and length of the prefix and cnrdhcpv6TypeDesc indicates extra grouping information on the prefix or link that triggered this event.