CA2534637C - Methods and apparatus for routing of information depending on the traffic direction - Google Patents
Methods and apparatus for routing of information depending on the traffic direction Download PDFInfo
- Publication number
- CA2534637C CA2534637C CA2534637A CA2534637A CA2534637C CA 2534637 C CA2534637 C CA 2534637C CA 2534637 A CA2534637 A CA 2534637A CA 2534637 A CA2534637 A CA 2534637A CA 2534637 C CA2534637 C CA 2534637C
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- Prior art keywords
- node
- client
- policy information
- routing policy
- network
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Classifications
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- 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
- H04L45/302—Route determination based on requested QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/08—Network architectures or network communication protocols for network security for authentication of entities
- H04L63/0892—Network architectures or network communication protocols for network security for authentication of entities by using authentication-authorization-accounting [AAA] servers or protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/63—Routing a service request depending on the request content or context
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/14—Multichannel or multilink protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/329—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the application layer [OSI layer 7]
Abstract
In a network supporting virtual private network (VPN) connections, a first network node (132) maintains separate routing policy information (130) to forward network traffic depending on a direction of the network traffic.
Upstream routing policy information (130-1) at the first node identifies a second node (134) to forward upstream traffic received from at least a first client (110-1) communicating through the first node. Downstream routing policy information (130-2) at the first node identifies how to forward downstream network traffic received from another node to the first client. By preventing use of the downstream policy routing information by the first client to route upstream network traffic, the first node is able to forward traffic along a path that the network traffic otherwise would have not traveled. For example, network traffic communicated through the first node can be forced to travel through another network node through which it would have not otherwise have passed if the downstream policy information was available to route the network traffic.
Upstream routing policy information (130-1) at the first node identifies a second node (134) to forward upstream traffic received from at least a first client (110-1) communicating through the first node. Downstream routing policy information (130-2) at the first node identifies how to forward downstream network traffic received from another node to the first client. By preventing use of the downstream policy routing information by the first client to route upstream network traffic, the first node is able to forward traffic along a path that the network traffic otherwise would have not traveled. For example, network traffic communicated through the first node can be forced to travel through another network node through which it would have not otherwise have passed if the downstream policy information was available to route the network traffic.
Claims (26)
1. In a network supporting virtual network connections associated with clients communicating through a first node, a method comprising:
maintaining separate upstream routing policy information and downstream routing policy information at the first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
maintaining separate upstream routing policy information and downstream routing policy information at the first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
2. A method as in claim 1, wherein the destination is a second client; and wherein, the traffic transmitted by the first client through the first node intended for receipt by the second client is forwarded to the second node.
3. A method as in claim 1 further comprising:
receiving a session initiation request from a second client to establish a session to communicate through the first node; from an address server, obtaining network address assignment information for the second client that generated the session initiation request, the assignment information including network address information to be used for identifying the second client; and populating the downstream routing policy information at the first node to include the network address information identifying the second client.
receiving a session initiation request from a second client to establish a session to communicate through the first node; from an address server, obtaining network address assignment information for the second client that generated the session initiation request, the assignment information including network address information to be used for identifying the second client; and populating the downstream routing policy information at the first node to include the network address information identifying the second client.
4. A method as in claim 3 further comprising:
receiving a network message from the second client coupled to communicate through the first node, the network message intended for receipt by the first client;
utilizing the upstream routing policy information in the first node to identify a third path on which to forward the network message; and forwarding the network message from the first node along the third path to the second node.
receiving a network message from the second client coupled to communicate through the first node, the network message intended for receipt by the first client;
utilizing the upstream routing policy information in the first node to identify a third path on which to forward the network message; and forwarding the network message from the first node along the third path to the second node.
5. A method as in claim 4 further comprising:
based on routing policy information at the second node, establishing a return path between the second node and the first node on which to forward the network messages to the first client through the first node.
based on routing policy information at the second node, establishing a return path between the second node and the first node on which to forward the network messages to the first client through the first node.
6. A method as in claim 1 further comprising:
based on use of the upstream routing policy information and downstream routing policy information at the first node, establishing a VPN (Virtual Private Network) connection between the first node and the second node on which to forward traffic from the first client.
based on use of the upstream routing policy information and downstream routing policy information at the first node, establishing a VPN (Virtual Private Network) connection between the first node and the second node on which to forward traffic from the first client.
7. A method as in claim 1, wherein the second node is part of a service provider network and the traffic between the first and second node is at least partly supported by a core network supporting a label switching protocol.
8. A method as in claim 1, wherein the upstream routing policy information and downstream routing policy information at the first node are each half duplex VRFs (Virtual Routing and Forwarding Instances) supporting forwarding of network messages generated by multiple clients communicating with each other through the first node and the second node.
9. A method as in claim 1 further comprising:
at the second node, applying a target-specific packet processing technique to the traffic from the first client forwarded through the second node.
at the second node, applying a target-specific packet processing technique to the traffic from the first client forwarded through the second node.
10. A method as in claim 1 further comprising:
populating the downstream routing policy information at the first node with network address information of each new client associated with a given service supported by a corresponding service provider.
populating the downstream routing policy information at the first node with network address information of each new client associated with a given service supported by a corresponding service provider.
11. A method as in claim 10 further comprising:
after the downstream routing policy information is populated in the first node for a new client, distributing the network address information populated in the downstream routing policy information at the first node to the second node via use of a notification message distributed according to a system routing protocol.
after the downstream routing policy information is populated in the first node for a new client, distributing the network address information populated in the downstream routing policy information at the first node to the second node via use of a notification message distributed according to a system routing protocol.
12. A method as in claim 11, wherein the system routing protocol is based on BGP (Border Gateway Protocol).
13. A computer system at a first node of a network that at least partially supports a virtual network connection, the computer system comprising:
a processor;
a memory unit that stores instructions associated with an application executed by the processor;
a communication interface that supports communication with other nodes of the physical network; and an interconnect coupling the processor, the memory unit, and the communication interface, enabling the computer system to execute the application and perform operations of :
maintaining separate upstream routing policy information and downstream routing policy information at the first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
a processor;
a memory unit that stores instructions associated with an application executed by the processor;
a communication interface that supports communication with other nodes of the physical network; and an interconnect coupling the processor, the memory unit, and the communication interface, enabling the computer system to execute the application and perform operations of :
maintaining separate upstream routing policy information and downstream routing policy information at the first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
14. A computer system as in claim 13, wherein the destination is a second client;
and wherein, the traffic transmitted by the first client through the first node intended for receipt by the second client is forwarded to the second node.
and wherein, the traffic transmitted by the first client through the first node intended for receipt by the second client is forwarded to the second node.
15. A computer system as in claim 13 that additionally performs operations of:
receiving a session initiation request from a second client to establish a session to communicate through the first node; from an address server, obtaining network address assignment information for the second client that generated the session initiation request, the assignment information including network address information to be used for identifying the second client; and populating the upstream routing policy information at the first node to include the network address information identifying the second client.
receiving a session initiation request from a second client to establish a session to communicate through the first node; from an address server, obtaining network address assignment information for the second client that generated the session initiation request, the assignment information including network address information to be used for identifying the second client; and populating the upstream routing policy information at the first node to include the network address information identifying the second client.
16. A computer system as in claim 15 that additionally performs operations of:
receiving a network message from the second client coupled to communicate through the first node, the network message intended for receipt by the first client;
utilizing the upstream routing policy information in the first node to identify a third path on which to forward the network message; and forwarding the network message from the first node along the third path to the second node.
receiving a network message from the second client coupled to communicate through the first node, the network message intended for receipt by the first client;
utilizing the upstream routing policy information in the first node to identify a third path on which to forward the network message; and forwarding the network message from the first node along the third path to the second node.
17. A computer system as in claim 16 that additionally performs operations of:
based on routing policy information at the second node, establishing a return path between the second node and the first node on which to forward the network messages to the first client through the first node.
based on routing policy information at the second node, establishing a return path between the second node and the first node on which to forward the network messages to the first client through the first node.
18. A computer system as in claim 13 that additionally performs operations of:
based on use of the upstream routing policy information and downstream routing policy information at the first node, establishing a VPN (Virtual Private Network) connection between the first node and the second node on which to forward traffic from the first client.
based on use of the upstream routing policy information and downstream routing policy information at the first node, establishing a VPN (Virtual Private Network) connection between the first node and the second node on which to forward traffic from the first client.
19. A computer system as in claim 13, wherein the second node is part of a service provider network and the traffic between the first and second node is at least partly supported by a core network supporting a label switching protocol.
20. A computer system as in claim 13, wherein the upstream routing policy information and downstream routing policy information at the first node are each half duplex VRFs (Virtual Routing and Forwarding Instances) supporting forwarding of network messages generated by multiple clients communicating with each other through the first node and the second node.
21. A computer system as in claim 13 that additionally performs operations of:
at the second node, applying a target-specific packet processing technique to the traffic from the first client forwarded through the second node.
at the second node, applying a target-specific packet processing technique to the traffic from the first client forwarded through the second node.
22. A computer system as in claim 13 that additionally performs operations of:
populating the downstream routing policy information at the first node with network address information of each new client associated with a given service supported by a corresponding service provider.
populating the downstream routing policy information at the first node with network address information of each new client associated with a given service supported by a corresponding service provider.
23. A computer system as in claim 22 that additionally performs operations of:
after the downstream routing policy information is populated in the first node for a new client, distributing the network address information populated in the downstream routing policy information at the first node to the second node via use of a notification message distributed according to a system routing protocol.
after the downstream routing policy information is populated in the first node for a new client, distributing the network address information populated in the downstream routing policy information at the first node to the second node via use of a notification message distributed according to a system routing protocol.
24. A computer system as in claim 23, wherein the system routing protocol is based on BGP (Border Gateway Protocol).
25. A computer system at a first node of a network that at least partially supports a virtual network connection, the computer system comprising:
means for maintaining separate upstream routing policy information and downstream routing policy information at the first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
means for maintaining separate upstream routing policy information and downstream routing policy information at the first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
26. A computer program product including a computer-readable medium having instructions stored thereon for processing data information, such that the instructions, when carried out by a processing device, enable the processing device to perform the steps of:
maintaining separate upstream routing policy information and downstream routing policy information at a first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
maintaining separate upstream routing policy information and downstream routing policy information at a first node, the upstream routing policy information being associated with a first path for traffic transmitted from a first client to a destination and the upstream routing policy information being used at the first node to identify a second node along the first path to forward upstream traffic received from the first client communicating through the first node, the downstream routing policy information being associated with a second path for traffic transmitted from the first client to the destination different from the first path; and for traffic transmitted by the first client through the first node, preventing use of the downstream routing policy information to route the traffic along the entire second path and instead utilizing the upstream routing policy information in the first node to ensure forwarding of the traffic transmitted by the first client from the first node to the second node.
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| US10/674,079 US7698456B2 (en) | 2003-09-29 | 2003-09-29 | Methods and apparatus to support routing of information |
| PCT/US2004/031842 WO2005034441A1 (en) | 2003-09-29 | 2004-09-29 | Methods and apparatus for routing of information depending on the traffic direction |
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| CA2534637A1 CA2534637A1 (en) | 2005-04-14 |
| CA2534637C true CA2534637C (en) | 2010-12-14 |
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| AT (1) | ATE427605T1 (en) |
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| DE (1) | DE602004020371D1 (en) |
| WO (1) | WO2005034441A1 (en) |
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2003
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2004
- 2004-09-29 EP EP04785209A patent/EP1678884B1/en active Active
- 2004-09-29 CA CA2534637A patent/CA2534637C/en not_active Expired - Fee Related
- 2004-09-29 AT AT04785209T patent/ATE427605T1/en not_active IP Right Cessation
- 2004-09-29 DE DE602004020371T patent/DE602004020371D1/en active Active
- 2004-09-29 CN CNB2004800203405A patent/CN100484077C/en not_active Expired - Fee Related
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|---|---|
| WO2005034441A1 (en) | 2005-04-14 |
| US7698456B2 (en) | 2010-04-13 |
| DE602004020371D1 (en) | 2009-05-14 |
| CN100484077C (en) | 2009-04-29 |
| EP1678884A1 (en) | 2006-07-12 |
| US20050083955A1 (en) | 2005-04-21 |
| EP1678884B1 (en) | 2009-04-01 |
| CA2534637A1 (en) | 2005-04-14 |
| ATE427605T1 (en) | 2009-04-15 |
| CN1823506A (en) | 2006-08-23 |
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