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Method for implementing bidirectional flow engineering tunnel

A traffic engineering and tunneling technology, applied in the communication field, which can solve the problems of GRE tunnel without bandwidth guarantee, complicated implementation and configuration, and inability to provide VPN services.

Active Publication Date: 2006-11-15
HUAWEI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of network processors (NPs) for GRE encapsulation and decapsulation processing can improve forwarding efficiency to a certain extent, but the cost of equipment will be greatly increased
[0006] 2. GRE tunnel technology adopts the method of encapsulating VPN data as a payload in a new IP message, which will increase a lot of bit overhead
[0007] 3. GRE tunnels do not have bandwidth guarantees and traffic engineering mechanisms, and GRE technology alone cannot provide VPN services with bandwidth guarantees
[0008] 4. The reliability of GRE tunnels depends on the routing convergence speed of dynamic routing protocols, which cannot meet the 50 millisecond carrier-grade link failure recovery time requirement
Therefore, it is more complicated to implement and configure

Method used

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Embodiment Construction

[0044] The present invention provides a method for realizing a two-way traffic engineering tunnel, and its main idea is: referring to the GRE two-way tunnel implementation mechanism, using the TE tunnel source address, destination address and TE tunnel name carried in the RSVP-TE protocol message to realize two-way Binding of two unidirectional TE tunnels. At the same time, in order to ensure that the EGRESS node of the TE tunnel can identify the data packets transmitted by different TE tunnels, RSVP-TE cannot use the second-to-last hop pop-up mechanism when the label distribution is performed on the EGRESS (egress) node, and distributes ordinary labels. Packets of different TE tunnels still carry different labels assigned by EGRESS after arriving at the EGRESS node.

[0045] Embodiments provided by the present invention, such as figure 1 shown, including:

[0046] Step 101, setting a binding object in the existing standard RSVP-TE protocol for setting a binding identifier. ...

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Abstract

The invention relates to a method for implementing bidirectional traffic engineering tunnel, and its kernel: as two routers each build a unidirectional tunnel between them, configuring bond objects in Resource reSerVation Protocol-Traffic Engineering (RSVP-TE) protocol; based on extension of the configured RSVP-TE protocol, binding the two unidirectional tunnels. By the built bidirectional tunnel, it can not only support all original service applications of RSVP-TE but flexibly and conveniently provide three-layer VPN services just like general routing enveloped (GRE) tunnel, where the VPN has enough bandwidth and TE attributes.

Description

technical field [0001] The invention relates to the communication field, in particular to a method for realizing a bidirectional traffic engineering tunnel. Background technique [0002] The RSVP-TE (Resource Reservation Protocol-Traffic Engineering) protocol is an extension of the traditional RSVP (Resource Reservation Protocol) protocol, and is used to implement traffic engineering in MPLS / IP networks. As a label distribution protocol, RSVP-TE can establish a TE (traffic engineering) tunnel based on constrained routing, and reserve bandwidth for the TE (traffic engineering) tunnel. In addition, RSVP-TE's FRR (fast rerouting) mechanism and LSP (label switching path) backup mechanism can ensure the reliability of the TE tunnel. [0003] The core of the prior art one related to the present invention is to use the GRE (Generic Routing Encapsulation) technology to establish a bidirectional tunnel. Router R1 establishes a tunnel interface, the source address is the IP address ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/54H04L29/06
CPCH04L12/4633H04L47/125H04L47/724H04L47/825H04L47/70
Inventor 李贺军
Owner HUAWEI TECH CO LTD
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