The check on the zero field of RIP packets is configured, and the RIP packets that do not pass the check are not processed.
Certain fields in the header of the RIPng packet must be set to 0, which is also called the zero field. After the zero field check for the RIPng packet is enabled, but the value in the zero field of the packet header is not 0, the packet is discarded without processing.
If all the packets are regarded to be reliable, this check is not needed, thus saving the processing time for the system.
By default, the zero field check is enabled.
ripng [ process-id ]