Patent ID: 7272648
Filing Date: 2007-09-18
Classification: H04L

Abstract:
1. A network monitoring device for monitoring load on a network, comprising: communication control means for communicating with a plurality of destination nodes via the network and performing at least one of a first routing, a second routing and a third routing, the first routing being an intra-area OSI routing, the second routing being an inter-area OSI routing and the third routing being TCP/IP routing; a first routing table for registering one or wore first MAC addresses of corresponding first one or more of the plurality of destination nodes when the first routing is performed; a second routing table for registering one or more second MAC addresses of corresponding second one or more of the plurality of destination nodes that serve as a gateway for a packet transmitted to a corresponding area address when the second routing is performed; a third routing table for registering one or more IP addresses of the second one or more of the plurality of destination nodes when the second routing is performed; counting means for counting a number of first destination nodes from a number of the first MAC addresses registered in the first routing table, counting a number of second destination nodes from a number of the second MAC addresses registered in the second routing table, and counting a number of third destination nodes from a number of the IP addresses registered in the third routing table; comparing means for comparing the first destination node count obtained from the first routing table with a preset first allowable value, and comparing the second destination node count obtained from the second routing table with a preset second allowable value, and comparing the third destination node count obtained from the third routing table with a preset third allowable value; alarm output means for outputting a first alarm that the first node count is excessively large when said comparing means determines that the first node count has exceeded the first allowable value, and outputting a second alarm that the second node count is excessively large when said comparing means determines that the second node count has exceeded the second allowable value, and outputting a third alarm that the third node count is excessively large when said comparing means determines that the third node count has exceeded the third allowable value.