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Rerouting method after lamina optical network route selection failure

An optical network and routing technology, applied in the field of communication, can solve problems such as unavoidable routing failure and errors in the calculation process

Inactive Publication Date: 2009-04-29
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] In the existing technology, the route between BN3 and BN5 is actually excluded, but the inter-domain links or nodes related to BN3 are actually excluded. Therefore, errors must occur in the calculation process during this period, resulting in Routing exists but routing failure cannot be avoided

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  • Rerouting method after lamina optical network route selection failure
  • Rerouting method after lamina optical network route selection failure
  • Rerouting method after lamina optical network route selection failure

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Embodiment Construction

[0027] Figure 1 is a schematic diagram of a three-layer ASON belonging to a hierarchical optical network, according to the OIF2002.023.09-DDRP-OSPF standard (wherein, OIF is Optical Internetworking Forum, the abbreviation of Optical Internet Forum, DDRP is Domain-Domain Routing Protocol domain-to-domain routing The abbreviation of the protocol, OSPF is the abbreviation of Open Shortest Path First), the node in a certain domain in the lowest layer 0 layer may not know the specific details of other domains, but it may need to perform routing in the following two cases of retries. The first situation is: when calculating a route from a certain node in one domain to another domain, signaling fails to establish a route after route selection. For example, when the route from C01 to C03 is selected, the route from BN3 to BN5 cannot be established when the signaling reaches BN3; The link in the domain is interrupted, and rerouting in the domain fails, and rerouting needs to be perfor...

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Abstract

When routing from a source initiating end is in failure, the method transfers the two nodes with obstructed routes as an elimination information through a signaling message to a previous source initiating end to rerouting, till rerouting is successful or tracing back to the first node of route connection, i.e. rerouting is in failure. Therein, when rerouting carries out, only one in two nodes in two tuple in any pair of elimination information can be selected at the utmost. The method can solve route selection in hierarchical route effectively, or validity of tracing back procedure when rerouting is in failure; that is to say conjuncture will not occur that there are chains but no route.

Description

technical field [0001] The present invention relates to communication technology, more specifically, relates to a method for rerouting after failure of hierarchical optical network routing selection. Background technique [0002] Automatic Switching Optical Network (hereinafter referred to as ASON) is a new generation of optical transport network that can intelligently and automatically complete the automatic switching connection of the optical network. The so-called automatic switching connection refers to the automatic discovery of network resources and topology structures. On the basis, the dynamic intelligent routing algorithm is invoked, and an end-to-end on-demand connection is established through distributed signaling processing and interaction. In order to complete the automatic switching connection function, ASON must have some basic functions, including discovery functions such as neighbor discovery, topology discovery, business discovery, routing functions, and si...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/56H04L47/32
Inventor 尹芳
Owner HUAWEI TECH CO LTD