Electrical computers and digital processing systems: multicomput – Computer-to-computer data routing
Reexamination Certificate
2001-07-06
2010-11-09
Refai, Ramsey (Department: 3627)
Electrical computers and digital processing systems: multicomput
Computer-to-computer data routing
C709S242000, C709S240000
Reexamination Certificate
active
07831733
ABSTRACT:
A method and system enables policy-based traffic forwarding in a data network by implementing policy-based control over propagation of LSA messages through the data network. A route tag is asserted in respect of a link state advertisement (LSA) message advertising a network address. Propagation of the LSA through the data network is controlled using the asserted internal route tag. At each hop, a policy decision affecting the forwarding of the LSA is made. Exemplary policy decisions include, Pass and Discard. In addition, the forwarding table may be updated using the route and address information contained in the LSA. In this case, routes entered in the forwarding table may be tagged as an inclusion route or an exclusion route. This may be based on the value of an exclusion route flag, which can, for example, be provided as a binary “0” or “1” inserted into an unused portion of the options field of the LSA.
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Jamieson Dwight D.
Simpson Valerie A.
Sultan Nevein T.
Avaya Holdings Limited
Blake Cassels & Graydon LLP
Daniels Kent
Refai Ramsey
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