Policy-based forwarding in open shortest path first (OSPF) networks
First Claim
1. A method of enabling policy-based traffic forwarding in a data network, the method comprising steps of:
- asserting a route tag in respect of a link state advertisement (LSA) message; and
controlling propagation of the LSA through the data network using the asserted internal route tag.
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Accused Products
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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Citations
31 Claims
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1. A method of enabling policy-based traffic forwarding in a data network, the method comprising steps of:
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asserting a route tag in respect of a link state advertisement (LSA) message; and
controlling propagation of the LSA through the data network using the asserted internal route tag. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30, 31)
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12. A router adapted for enabling policy-based traffic forwarding in a data network, the router comprising means for controlling propagation of a link state advertisement (LSA) message through the data network using a route tag asserted in respect of the LSA.
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25. A software program adapted to control a router to enable policy-based traffic forwarding in a data network, the software program comprising software adapted to control propagation of a link state advertisement (LSA) message through the data network using a route tag asserted in respect of the LSA.
Specification