US6574197B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Network monitoring device
Assignee: Mitsubishi Electric Corp
•
Filing: 1998-12-21
•
Granted: 2003-06-03
•
Expires: 2018-12-21
Abstract
Abstract A network monitoring device disposed at a node connected to a network includes a determination unit for sending a monitoring packet to a neighboring node upstream or downstream, and for determining that the neighboring node has broken away from the network unless the determination unit does not receive a response packet from the neighbor, and a notification unit for, when the determination unit has determined that the neighboring node upstream or downstream has broken away from the network, broadcasting a notification packet indicating the event to all other nodes connected to the network.
Inventors
- 👤 Hiroo Kanamaru
- 👤 Masato Ushijima
- 👤 Kenji Ueda
- 👤 Yukio Yaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:54
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/08; H04L43/0805; H04L43/0817
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
114 words
A network monitoring device disposed at a node connected to a network, comprising: response means, responsive to a monitoring packet from a neighboring node downstream, for sending a response packet to the neighboring node downstream; determination means for sending the monitoring packet to a neighboring node upstream, and for determining that the neighboring node upstream has broken away from said network if said determination means does not receive the response packet responsive to the monitoring packet from the neighboring node upstream; and notification means for, when said determination means has determined that the neighboring node upstream has broken away from said network, broadcasting a notification packet to all other nodes connected to said network.
Claim 2
Dependent Claim
114 words
A network monitoring device disposed at a node connected to a network, comprising: response means, responsive to a monitoring packet from a neighboring node downstream, for sending a response packet to the neighboring node downstream; determination means for sending the monitoring packet to a neighboring node upstream, and for determining that the neighboring node upstream has broken away from said network if said determination means does not receive the response packet responsive to the monitoring packet from the neighboring node upstream; and notification means for, when said determination means has determined that the neighboring node upstream has broken away from said network, broadcasting a notification packet to all other nodes connected to said network.
Claim 3
Dependent Claim
68 words
The network monitoring device according to claim 1 , further comprising a management table for storing logical addresses identifying the neighboring nodes upstream and downstream, respectively, and updating means for updating the management table when said determination means has determined that the neighboring node upstream has broken away from said network or upon receipt of the notification packet indicating that another node has broken away from said network.
Claim 4
Dependent Claim
64 words
The network monitoring device according to claim 2 , wherein, when said node to which said network monitoring device belongs newly participates in said network, said updating means broadcasts a monitoring packet to all other nodes connected to said network and generates the management table based on response packets responsive to the monitoring packet, which can be sent by all of the other nodes.
Claim 5
Dependent Claim
50 words
The network monitoring device according to claim 3 , wherein, in response to a monitoring packet from another node that has newly participated in said network, said response means sends a response packet responsive to the monitoring packet to the other node and said updating means updates the management table.
Claim 6
Dependent Claim
47 words
The network monitoring device according to claim 1 , wherein said determination means sends a monitoring packet to at least one other node disposed between said node to which said network monitoring device belongs and the neighboring node upstream which has not yet participated in said network.
Claim 7
Dependent Claim
66 words
The network monitoring device according to claim 5 , wherein, when the number of other nodes that lie between said node to which said network monitoring device belongs and the neighboring node upstream exceeds a threshold number, and those nodes have not yet participated in said network, said determination means broadcasts a monitoring packet to the other nodes that have not yet participated in said network.
Claim 8
Dependent Claim
68 words
The network monitoring device according to claim 1 , further comprising searching means for, when said determination means has determined that the neighboring node upstream has broken away from said network, sending a monitoring packet to at least one other node that belongs to a search area upstream, and for searching for a new neighboring node upstream based on at least one packet response to the monitoring packet.
Claim 9
Dependent Claim
58 words
The network monitoring device according to claim 7 , wherein, unless said searching means is able to find the new neighboring node upstream through the search area, said searching means changes and shifts the search area including at least one other node in an upstream direction, and then sends a monitoring packet to said the search area again.
Claim 10
Dependent Claim
27 words
The network monitoring device according to claim 2 , further comprising numbering means for adding a time-sequence number to any packet to be sent to another node.
Claim 11
Dependent Claim
64 words
The network monitoring device according to claim 9 , wherein, when said updating means needs to update the management table using a packet applied from another node, said updating means refers to a time-sequence number added to the packet, and then updates the management table only if the received packet is associated with latest event of events that have occurred in the other node.
Claim 12
Dependent Claim
114 words
A network monitoring device disposed at a node connected to a network, comprising: response means, responsive to a monitoring packet from a neighboring node upstream, for sending a response packet to the neighboring node upstream; determination means for sending the monitoring packet to a neighboring node downstream, and for determining that the neighboring node downstream has broken away from said network if said determination means does not receive the response packet responsive to the monitoring packet from the neighboring node downstream; and notification means for, when said determination means has determined that the neighboring node downstream has broken away from said network, broadcasting a notification packet to all other nodes connected to said network.
Claim 13
Dependent Claim
114 words
A network monitoring device disposed at a node connected to a network, comprising: response means, responsive to a monitoring packet from a neighboring node upstream, for sending a response packet to the neighboring node upstream; determination means for sending the monitoring packet to a neighboring node downstream, and for determining that the neighboring node downstream has broken away from said network if said determination means does not receive the response packet responsive to the monitoring packet from the neighboring node downstream; and notification means for, when said determination means has determined that the neighboring node downstream has broken away from said network, broadcasting a notification packet to all other nodes connected to said network.
Claim 14
Dependent Claim
68 words
The network monitoring device according to claim 11 , further comprising a management table for storing logical addresses identifying the neighboring nodes upstream and downstream, respectively, and updating means for updating the management table when said determination means has determined that the neighboring node downstream has broken away from said network or upon receipt of the notification packet indicating that another node has broken away from said network.
Claim 15
Dependent Claim
64 words
The network monitoring device according to claim 12 , wherein, when said node to which said network monitoring device belongs newly participates in said network, said up-dating means broadcasts a monitoring packet to all other nodes connected to said network and generates the management table based on response packets responsive to the monitoring packet, which can be sent by all of the other nodes.
Claim 16
Dependent Claim
50 words
The network monitoring device according to claim 13 , wherein, in response to a monitoring packet from another node that has newly participated in said network, said response means sends a response packet responsive to the monitoring packet to the other node and the updating means updates said management table.
Claim 17
Dependent Claim
47 words
The network monitoring device according to claim 11 , wherein said determination means sends a monitoring packet to at least one other node disposed between said node to which said network monitoring device belongs and the neighboring node downstream which has not yet participated in said network.
Claim 18
Dependent Claim
66 words
The network monitoring device according to claim 15 , wherein, when the number of other nodes that lie between said node to which said network monitoring device belongs and the neighboring node downstream exceeds a threshold number, and those nodes have not yet participated in said network, said determination means broadcasts a monitoring packet to the other nodes that have not yet participated in said network.
Claim 19
Dependent Claim
68 words
The network monitoring device according to claim 11 , further comprising searching means for, when said determination means has determined that the neighboring node downstream has broken away from said network, sending a monitoring packet to at least one other node that belongs to a search area downstream, and for searching for a new neighboring node downstream based on at least one packet response to the monitoring packet.
Claim 20
Dependent Claim
57 words
The network monitoring device according to claim 17 , wherein, unless said searching means is able to find the new neighboring node downstream through the search area, said searching means changes and shifts the search area including at least one other node in an downstream direction, and then sends a monitoring packet to the search area again.
Claim 21
Dependent Claim
27 words
The network monitoring device according to claim 12 , further comprising numbering means for adding a time-sequence number to any packet to be sent to another node.
Claim 22
Dependent Claim
64 words
The network monitoring device according to claim 19 , wherein, when said updating means needs to update management table using a packet applied from another node, said updating means refers to a time-sequence number added to the packet, and then updates the management table only if the received packet is associated with the latest event of events that have occurred in the other node.
References Cited (Backward Citations)
US4637013A
Cited
US4627055A
Cited
US4697268A
Cited
US4881074A
Cited
US5018133A
Cited
US5463763A
Cited
JPH064354A
Cited
US5390326A
Cited
JPH0895931A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2006-06-02 | 2006-12-02 | 2007-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2010-06-02 | 2010-12-02 | 2011-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2014-06-02 | 2014-12-02 | 2015-06-03 | $7700.00 | Window Closed / Lapsed |