US5644571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for message filtering in a network using domain class
Assignee: Compaq Computer Holding Ltd
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Filing: 1993-06-04
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Granted: 1997-07-01
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Expires: 2013-06-04
Abstract
Abstract In an apparatus in a computer network, message filtering proceeds by generating respective class specifiers from a received message, using the message source field, message destination field, and type of message field. The class specifiers are used for generating a class specification, and a domain class is generated from the class specification. A domain list is generated to provide a list of ports to which a message directed to the domain class is to be forwarded. The message is forwarded to the ports listed in the domain list. The apparatus may be a bridge, router, etc.
Inventors
- 👤 Michael J. Seaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:03
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/46; H04L12/4604; H04L12/462; H04L12/4625
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
143 words
In an apparatus in an area network, message filtering means to direct a received message to at least one port for transmission there-through comprising: means for generating respective class specifiers for said received message from a contents of a message source field, a message destination field, and a type of message field; means for generating a class specification from the class specifiers; means for generating a domain class from the class specification, said domain class having fewer entries than said class specifiers; means for generating a domain list from the domain class, said domain list having more entries than said domain class, said domain list representing a subarea in the area network to which a message is to be sent; and means for generating a list of ports from the domain list, said list of ports selected to have said message transmitted there-through.
Claim 2
Dependent Claim
143 words
In an apparatus in an area network, message filtering means to direct a received message to at least one port for transmission there-through comprising: means for generating respective class specifiers for said received message from a contents of a message source field, a message destination field, and a type of message field; means for generating a class specification from the class specifiers; means for generating a domain class from the class specification, said domain class having fewer entries than said class specifiers; means for generating a domain list from the domain class, said domain list having more entries than said domain class, said domain list representing a subarea in the area network to which a message is to be sent; and means for generating a list of ports from the domain list, said list of ports selected to have said message transmitted there-through.
Claim 3
Dependent Claim
19 words
Message filtering means according to claim 1 wherein each of the generating means is provided by respective look-up means.
Claim 4
Dependent Claim
40 words
Message filtering means according to either claim 1 or claim 2 wherein the means for generating a class specification from the class specifiers, and the means for generating a domain class from the class specification, comprises a single look-up table.
Claim 5
Dependent Claim
26 words
Message filtering means according to either claim 1 or claim 2 wherein the means for generating a class specification from the class specifiers includes concatenating means.
Claim 6
Dependent Claim
27 words
Message filtering means according to claim 1 or claim 2 wherein the means for generating a class specification from the class specifiers comprises algorithmic logical combination means.
Claim 7
Dependent Claim
26 words
Message filtering means according to claim 1 or claim 2 further comprising dynamic filtering means, the dynamic filtering means output combined with the list of ports.
Claim 8
Dependent Claim
22 words
Message filtering means according to claim 3 wherein the means for generating a class specification from the class specifiers includes concatenating means.
Claim 9
Dependent Claim
24 words
Message filtering means according to claim 3 wherein the means for generating a class specification from the class specifiers comprises algorithmic logical combination means.
Claim 10
Dependent Claim
23 words
Message filtering means according to claim 3 further comprising dynamic filtering means, the dynamic filtering means output combined with the list of ports.
Claim 11
Dependent Claim
23 words
Message filtering means according to claim 4 further comprising dynamic filtering means, the dynamic filtering means output combined with the list of ports.
Claim 12
Dependent Claim
23 words
Message filtering means according to claim 5 further comprising dynamic filtering means, the dynamic filtering means output combined with the list of ports.
Claim 13
Dependent Claim
117 words
In an apparatus in an area network, a method of filtering messages comprising the steps of: generating respective class specifiers from a message source field, a message destination field, and a type of message field; generating a class specification from the class specifiers; generating a domain class from the specification, said domain class having fewer entries than said class specifiers; generating a domain list from the domain class, said domain list having more entries than said domain class, said domain list representing a subarea of the area network to which a message is to be sent; and generating a list of ports from the domain list, said list of ports selected to have said message transmitted there-through.
Claim 14
Dependent Claim
117 words
In an apparatus in an area network, a method of filtering messages comprising the steps of: generating respective class specifiers from a message source field, a message destination field, and a type of message field; generating a class specification from the class specifiers; generating a domain class from the specification, said domain class having fewer entries than said class specifiers; generating a domain list from the domain class, said domain list having more entries than said domain class, said domain list representing a subarea of the area network to which a message is to be sent; and generating a list of ports from the domain list, said list of ports selected to have said message transmitted there-through.
References Cited (Backward Citations)
US5086426A
Cited
US5144622A
Cited
US5345587A
Cited
US4864559A
Cited
US4922503A
Cited
US4933938A
Cited
US5247620A
Cited
US5214646A
Cited
US5136580A
Cited
US5305305A
Cited
US5251205A
Cited
US5280480A
Cited
EP0508886A1
Cited
US5434845A
Cited
US5313465A
Cited
US5396493A
Cited
US5383187A
Cited
US5361256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-06-30 | 2000-12-30 | 2001-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-06-30 | 2004-12-30 | 2005-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-06-30 | 2008-12-30 | 2009-07-01 | $7700.00 | Window Closed / Lapsed |