CA2433891A1 - Policy-based forwarding in open shortest path first (ospf) networks - Google Patents

Policy-based forwarding in open shortest path first (ospf) networks Download PDF

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Publication number
CA2433891A1
CA2433891A1 CA002433891A CA2433891A CA2433891A1 CA 2433891 A1 CA2433891 A1 CA 2433891A1 CA 002433891 A CA002433891 A CA 002433891A CA 2433891 A CA2433891 A CA 2433891A CA 2433891 A1 CA2433891 A1 CA 2433891A1
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Canada
Prior art keywords
lsa
router
route tag
route
forwarding
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Granted
Application number
CA002433891A
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French (fr)
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CA2433891C (en
Inventor
Nevein T. Sultan
Dwight D. Jamieson
Valerie A. Simpson
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Avaya Holdings Ltd
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Individual
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Publication of CA2433891A1 publication Critical patent/CA2433891A1/en
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Publication of CA2433891C publication Critical patent/CA2433891C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/04—Interdomain routing, e.g. hierarchical routing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/03—Topology update or discovery by updating link state protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/02—Topology update or discovery
    • H04L45/033—Topology update or discovery by updating distance vector protocols

Abstract

Policy-based traffic forwarding in a data network is implemented using 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, such as a binary "0" or "1" inserted into an unused portion of the options field of the LSA.

Claims (31)

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.
2. A method as claimed in claim 1, wherein the data network is an Open Shortest Path first (OSPF) network.
3. A method as claimed in claim 1, wherein the route tag comprises one of:
an internal route tag associated with an address located within an autonomous system of the data network; and an external route tag associated with an address located outside the autonomous system.
4. A method as claimed in claim 1, wherein the step of asserting a route tag comprises steps of:
setting a route tag value respecting the LSA; and inserting the route tag value into a predetermined field of the LSA.
5. A method as claimed in claim 4, wherein the route tag value is set by a policy having a match criteria corresponding to a predetermined attribute of the LSA.
6. A method as claimed in claim 5, wherein the predetermined attribute comprises any one or more of:
a source address; a source area; a destination address; and a destination area.
7. A method as claimed in claim 4, wherein the LSA is a Type-5 LSA, and the step of inserting the route tag comprises a step of inserting the route tag value into an external route tag field of the LSA.
8. A method as claimed in claim 4, wherein the step of inserting the route tag comprises a step of inserting the route tag value into an internal route tag field of a modified Type-3 LSA.
9. A method as claimed in claim 1, wherein the step of controlling propagation of the LSA comprises a step of implementing a forwarding policy having a match criteria corresponding to the asserted route tag.
10. A method as claimed in claim 9, wherein the forwarding policy corresponds to one of:
a pass decision, in which the LSA is forwarded to a downstream link; and a discard decision, in which the LSA is discarded without forwarding.
11. A method as claimed in claim 10, wherein implementation of the forwarding policy further comprises a step of updating a forwarding table using information contained in the LSA as either one of: an inclusion route; and an exclusion route.
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.
13. A router as claimed in claim 12, wherein the data network comprises an Open Shortest Path first (OSPF) network.
14. A router as claimed in claim 13, wherein the router comprises any one of an autonomous system border router, and an area border router.
15. A muter as claimed in claim 12, wherein the route tag comprises one of:
an internal route tag associated with an address located within an autonomous system of the data network; and an external route tag associated with an address located outside the autonomous system.
16. A muter as claimed in claim 12, wherein the means for controlling propagation of the LSA comprises means for implementing a forwarding policy having a match criteria corresponding to at least the asserted route tag.
17. A router as claimed in claim 16, wherein the forwarding policy corresponds to one of:
a pass decision, in which the LSA is forwarded to a downstream link; and a discard decision, in which the LSA is discarded without forwarding.
18. A router as claimed in claim 17, wherein the means for implementing the forwarding policy further comprises means for updating a forwarding table using information contained in the LSA as either one of: an inclusion route and an exclusion route.
19. A router as claimed in claim 12, further comprising means for asserting the route tag in respect of the LSA.
20. A router as claimed in claim 19, wherein the means for asserting the route tag comprises:
means for setting a route tag value respecting the LSA; and means for inserting the route tag into a predetermined field of the LSA.
21. A router as claimed in claim 20, wherein the means for setting the route tag value comprises a policy having a match criteria corresponding to one or more predetermined attributes of the LSA.
22. A router as claimed in claim 21, wherein the one or more predetermined attributes comprise any one or more of: a source address; a source area; a destination address; and a destination area.
23. A router as claimed in claim 20, wherein the router is an ASBR, and the means for inserting the route tag is adapted to insert the route tag value into an external route tag field of a Type-5 LSA.
24. A router as claimed in claim 20, wherein the router is an ABR, and the means for inserting the route tag is adapted to insert the route tag value into an internal route tag field of a modified Type-3 LSA.
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.
26. A software program as claimed in claim 25, wherein the software adapted to control propagation of the LSA comprises software adapted to implement a forwarding policy having a match criteria corresponding to at least the asserted route tag.
27. A software program as claimed in claim 26, wherein the software adapted to implement the forwarding policy further comprises software adapted to control the router to update a forwarding table using information contained in the LSA as either one of: an inclusion route and an exclusion route.
28. A software program as claimed in claim 25, further comprising software adapted to control the router to assert the route tag in respect of the LSA.
29. A software program as claimed in claim 28, wherein the software adapted to control the router to assert the route tag comprises:
software adapted to control the router to set a route tag value respecting the LSA; and software adapted to control the router to insert the route tag into a predetermined field of the LSA.
30. A software program as claimed in claim 29, wherein the router is an ASBR, and the software adapted to control the router to insert the route tag is adapted to control the router to insert the route tag value into an external route tag field of a Type-5 LSA.
31. A software program as claimed in claim 29, wherein the router is an ABR, and the software adapted to control the router to insert the route tag is adapted to control the router to insert the route tag value into an internal route tag field of a modified Type-3 LSA.
CA2433891A 2001-07-06 2001-12-20 Policy-based forwarding in open shortest path first (ospf) networks Expired - Fee Related CA2433891C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/899,265 US7831733B2 (en) 2001-07-06 2001-07-06 Policy-based forwarding in open shortest path first (OSPF) networks
US09/899,265 2001-07-06
PCT/CA2001/001827 WO2003005649A1 (en) 2001-07-06 2001-12-20 Policy-based forwarding in open shortest path first (ospf) networks

Publications (2)

Publication Number Publication Date
CA2433891A1 true CA2433891A1 (en) 2003-01-16
CA2433891C CA2433891C (en) 2010-09-28

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CA2433891A Expired - Fee Related CA2433891C (en) 2001-07-06 2001-12-20 Policy-based forwarding in open shortest path first (ospf) networks

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US (1) US7831733B2 (en)
EP (1) EP1405468B1 (en)
CA (1) CA2433891C (en)
DE (1) DE60128733T2 (en)
WO (1) WO2003005649A1 (en)

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