Traffic engineering path establishing method, device and system

A method of establishment and technology of traffic engineering, applied in the field of data communication, can solve the problems of forwarding efficiency beyond the label encapsulation capability of the device, MTU, label stack depth, etc., so as to improve the packet load efficiency, facilitate status detection, and reduce the label stack depth. Effect

Active Publication Date: 2020-06-30
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A complete SR-TE path is generally very long. That is to say, the head node of the SR-TE path needs to encapsulate too deep a label stack for forward

Method used

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  • Traffic engineering path establishing method, device and system
  • Traffic engineering path establishing method, device and system
  • Traffic engineering path establishing method, device and system

Examples

Experimental program
Comparison scheme
Effect test

example

[0215] The tail node D uses the local unique absolute label value corresponding to the first SLID as the key value to create a corresponding ILM forwarding entry as the first forwarding table (the label operation is POP). In an illustrative example, including:

[0216] When the first SLID is a globally unique index value, the tail node D obtains the corresponding local unique absolute label value by offsetting the first SLID in the SRGB of the tail node D itself, and establishes the ILM with the obtained local unique absolute label value as the key value A forwarding entry: when the first SLID is already a globally unique absolute label value or a local unique absolute label value, an ILM forwarding entry is directly established with the first SLID as a key value.

[0217] In an exemplary instance, when the node is a tail node D, the second notification module is specifically used to:

[0218] The tail node D advertises the TE path and the obtained first SLID to its upstream ...

no. 2 example

[0292] The second embodiment combines Figure 13 , based on the first embodiment, in the case that the intra-domain topology information needs to be kept secret, each sub-PCE may return intra-domain path segment information composed of Path-key subobjects to the parent PCE. In the second embodiment, it is assumed that the path segment information returned by the sub-PCE1, sub-PCE2, and sub-PCE3 to the parent PCE4 are path-key1, path-key2, and path-key3 respectively. After inter-domain links and domain boundary nodes are added to PCE4, the Get the complete end-to-end TE path: {bn(S),path-key1,bn(A1),link(A1->A2),bn(A2),path-key2,bn(A3),link(A3- >A4), bn(A4), path-key3, bn(D)}, the TE path will be sent to the head node S via PCE1, and sent to the tail node D via PCE3. Similar to the first embodiment, the tail node D will send the BGP-SR TENLRI reachability notification of the SR-TE path to the upstream domain border node A4 through BGP, and so on, triggering the allocation of S...

no. 3 example

[0307] The third embodiment combines Figure 13 , based on the first embodiment, when the topology in the network changes and there is no longer a TE path that meets the corresponding constraint conditions, the parent PCE4 will send a PCUpd message to the child PCE1 and child PCE3, and the EROobject included in it is empty. It should be noted that , PCE1 has authorized PCE4 in advance for the calculation of the BGP-SR TE path.

[0308] Furthermore, PCE1 sends a PCUpd message to the head node S, and the ERO object included in it is empty; PCE3 sends a PCUpd message to the tail node D, and the ERO object included in it is empty.

[0309] After receiving the PCUpd message, the head node S can clear the FTN forwarding information corresponding to the BGP-SR TE path. However, in order to avoid unnecessary traffic interruption, the head node S can delay clearing the FTN forwarding information.

[0310] After the tail node D receives the above PCUpd message, it releases the SLID loc...

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Abstract

The invention discloses a traffic engineering path establishing method, device and system. According to the application, the BGP is adopted to announce the distribution of the SLID among the node devices, so that various scenes including cross-domain TE path calculation and forwarding are satisfied, the depth of a label stack for message encapsulation is reduced, the message load efficiency is improved, and MTU fragmentation is avoided; and meanwhile, each SR node has a maintainable state through the SLID, so that the intermediate node and the tail node realize the identification of differentTE paths, and the state detection for different TE paths is facilitated.

Description

technical field [0001] The present application relates to but not limited to data communication technology, especially a traffic engineering (TE, Traffic Engineering) path establishment method and device. Background technique [0002] In related technologies that adopt a hierarchical Path Computation Element (PCE, Path Computation Element) architecture to calculate cross-domain (domain) traffic engineering (TE, Traffic Engineering) paths, the parent PCE can obtain all domain-to-domain traffic from each child PCE Connect relationships and maintain domain-level topology. When the parent PCE is requested by a sub-PCE to calculate the cross-domain TE path, the parent PCE first obtains which domain sequences the TE path may pass through based on the domain-level topology, and then requests each sub-PCE to calculate the corresponding domain sequence. Path fragments within a domain; for a certain domain sequence, after the parent PCE receives the calculation results returned by ea...

Claims

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Application Information

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IPC IPC(8): H04L12/715H04L12/721H04L12/741H04L45/74
CPCH04L45/04H04L45/38H04L45/44H04L45/54
Inventor 彭少富金飞蔡
Owner ZTE CORP
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