Description: This attribute specifies the node portion in the source IPX address (that is, the MAC address or circuit ID) of received RIP packets for which the contained network tuples should be filtered or passed depending on the disposition of the filter. This attribute is only valid for filters applied to a port in the input direction and will be ignored if the filter is applied in the output direction.The node number can be entered either as a dashed hex string or a string of hex digits entered in pairs of hex digits up to a maximum length of 12 digits; in addition to hex digits, use of the character '?' to indicate wildcarding is allowed. (For example a valid node number would be 00-20-??-??-??-?? or 0020???????? ). Wildcard characters may be used only in pairs to replace a pair of hex digits. A node number preceded by a caret (^) should be interpreted as matching all RIP packets' network tuples except for the RIP packets with this source node address. For a given filter, only networks matching all the specified attributes of that filter are filtered or passed depending on the disposition of the filter.