Abstract: Discovery of switched domain topology of the network is an important part of LAN network management tasks. This paper proposed a switched domain topology discovery algorithm relying on spanning tree protocol. The algorithm gets spanning tree status information of each switch in switched domain by SNMP. According to STP rules,switched domain topology of the network is derived. The algorithm is much easier and more accurate than other existing algorithms relying on FDB information. Now this algorithm is made application to network management in reality suc- cessfully.

Key words: Switched domain, Spanning tree protocol, FDB, Network management