Description: A table of topology information for each Network Management Module (NMM) with a Token Ring interface on the same 'flat network' as the reporting NMM. The number of entries is determined by the number of detected (and active) NMMs. Entries in the table are created by reception of a topology message with information about a 'new' NMM. An entry is removed from the table when an NMM is not present in the topology message from a ring, or when no topology messages are received from a ring in the required time interval.