WO2012062091A1 - Procédé et système pour l'identification automatique de l'attribut d'état d'un élément de calcul de chemin (pce) - Google Patents

Procédé et système pour l'identification automatique de l'attribut d'état d'un élément de calcul de chemin (pce) Download PDF

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WO2012062091A1
WO2012062091A1 PCT/CN2011/073814 CN2011073814W WO2012062091A1 WO 2012062091 A1 WO2012062091 A1 WO 2012062091A1 CN 2011073814 W CN2011073814 W CN 2011073814W WO 2012062091 A1 WO2012062091 A1 WO 2012062091A1
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pce
state
attribute
plane node
control plane
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PCT/CN2011/073814
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English (en)
Chinese (zh)
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王志宏
谢刚
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中兴通讯股份有限公司
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Publication of WO2012062091A1 publication Critical patent/WO2012062091A1/fr

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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

Definitions

  • the present invention relates to a control technology of a Path Computation Element (PCE) in an intelligent bearer network, and more particularly to a method and system for automatically identifying a PCE state attribute.
  • PCE Path Computation Element
  • ITU-T SG15 ( ITU-T SG15 named ASON) came into being.
  • This is a network that implements automatic connection management through various transport networks (including SDH, PTN, or OTN) using independent ASON control planes.
  • This optical network with independent control planes is called an intelligent optical network.
  • Intelligent optical network has automatic discovery function, including automatic discovery of business, topology, and resource changes. It has powerful computing functions, which can calculate, analyze, reason, and judge according to these changes in the network environment. A principle ultimately determines; has a fast and dynamic connection establishment capability, and provides protection and recovery functions for the required services; can provide different types of services with different priorities.
  • the number of paths in the network is n (nl)/2, so that traffic can quickly recover or dredge the network in case of network failure or abnormal network traffic changes.
  • Service requires the input node network device at the fault node or abnormal traffic to calculate the optimal recovery or circuitous path according to various constraints in the shortest possible time.
  • the shortening of the calculation time means the recovery speed is improved, the optimal path It means the improvement of network utilization efficiency.
  • This kind of complex calculation often requires understanding of the global topology and constraints of the network. It requires a lot of CPU computing resources to run complex algorithms, and when a large amount of CPU resources are applied to the path calculation. It has a certain impact on the stability of network equipment and the stability of the entire network, all of which is a great challenge for network equipment.
  • PCE is a functional entity in the network that is responsible for path computation. It is based on known network topology and constraints. Calculate a best path that satisfies the constraint based on the path calculation client's request.
  • the PCE can be located anywhere in the network and can be integrated within the network device, such as inside a Label Switch Router (LSR) or as a standalone device.
  • LSR Label Switch Router
  • the path calculation client (PCC, Path Computation Clients) and the PCE, and the PCE and PCE communicate through a dedicated path calculation protocol (PCE Communication Protocol), submit a path calculation request, and obtain a path calculation result.
  • the PCC can be an LSR in an MPLS/GMPLS network or a Network Management System (NMS).
  • NMS Network Management System
  • PCE can be divided into stateful and stateless.
  • Stateless PCE uses only the information in the Traffic Engineering Database (TED) for path computation, while stateful PCE is based not only on topology information in the Traffic Engineering Database (TED), but also on path computation. Take advantage of information about existing paths and occupied resources in the network. Since the stateful PCE has more information, on the one hand, it has better path computation ability than the stateless PCE. Under the same conditions, the stateful PCE should be preferred. In some cases, only the stateful PCE can be used for path calculation. On the one hand, the synchronization of resource information is different from the additional requirement of stateless PCE. Therefore, the state attribute of PCE (that is, whether PCE is stateful PCE) is necessary to be recognized by PCC and other PCEs in the domain, see below. Scene description:
  • Scene 1 Synchronization between the control plane and the PCE.
  • the stateful PCE needs to save the path information of the existing services in the live network. Therefore, when the service status changes (establish, delete), the service change information must be synchronized to the stateful PCE in time. To achieve this, the control plane node needs to identify the state attribute of the PCE that has a session with itself.
  • Scenario 2 Single-domain multi-PCE scenario, synchronization between PCEs.
  • the stateful PCE guarantees the accuracy of its own state information through a synchronization mechanism with the control plane node.
  • the information should be forwarded to the adjacent stateful PCE in time to ensure that all stateful PCE services in the domain are consistent.
  • Sexuality and correctness that is, when there are multiple PCEs in the domain, stateful PCEs need to recognize each other's state attributes to establish a state synchronization relationship.
  • Scenario 3 Prioritize a stateful PCE. Since the path computation quality of the stateful PCE is better than the stateless PCE, the PCC should preferentially select the stateful PCE for path calculation under the same conditions. Therefore, when the PCC knows the status attribute of the PCE, the stateful PCE can be purposefully selected for path calculation, thereby obtaining a more ideal path calculation result.
  • PCE's auto-discovery mechanism is used to make PCC aware of its existence and capability attributes.
  • PCE PCE Discovery TLV
  • PCED PCE Discovery TLV
  • PCED TLV The TLV discovered by PCE can be referred to as PCED TLV.
  • the TLV is used to flood the PCE information into the entire domain to notify the members of the domain of the PCE related information, such as the PCE location, the PCE path calculation range (inter-domain, AS inter-domain, cross-network layer, etc.), for one or more Information such as visibility of PCE, neighboring PCE, communication capabilities, and path computation capabilities.
  • the PCED TLV consists of a series of sub-TLVs that can be placed in the PCED TLV in any order.
  • OSPF Open Shortest Path First
  • the defined sub-TLVs are as follows:
  • the Category 5 sub-TLV is used to represent the capability information of the PCE and is an optional sub-TLV.
  • a maximum of one PCE-CAP-FLAGS sub-TLV can exist in a PCED TLV. If there are multiple, only the first one is valid.
  • the PCE-CAP-FLAGS sub-TLV format is shown in Figure 1.
  • the type (Type) is 5, the length (length) is a multiple of 4, and the PCE Capability Flags is the PCE capability flag.
  • the PCE status attribute is not identified in the capability flag (that is, whether it is a stateful PCE)
  • the PCE status attribute is automatically recognized by the PCE automatic discovery mechanism, that is, whether a PCE is a stateful PCE is automatically recognized. It affects the scenario where PCC selects PCE and synchronizes between stateful PCEs. There is an urgent need for an automatic identification of PCE status attributes. Summary of the invention
  • the main object of the present invention is to provide an automatic identification method and system for PCE state attributes, which can automatically identify the PCE state attribute by the PCE automatic discovery mechanism.
  • a method for automatically identifying a PCE state attribute comprising: a path calculation unit (PCE) adding a state attribute representation capability of the PCE in the automatic discovery information, and the PCE diffusing and propagating the state of the PCE through a flooding mechanism of the link state routing protocol
  • the control plane node receives the automatic discovery information through a link state routing protocol, and identifies the state attribute of the PCE by parsing and comparing the automatic discovery information.
  • the method further includes: the control plane node triggers a state synchronization between the control plane node and the stateful PCE according to the identified state attribute of the PCE.
  • the control plane node When the status attribute of the PCE indicates a capability usage capability identifier bit, the control plane node identifies the status attribute of the PCE, including: if the PCE floods the status attribute capability identifier in the automatic discovery information After the PCE is a stateful PCE, the control plane node receives the automatic discovery information of the PCE flooding, and identifies the state attribute of the PCE according to the state attribute capability identifier carried in the automatic discovery information. Stateful PCE.
  • the state synchronization between the triggered control plane node and the stateful PCE includes: when the connection state transmission changes, the control plane node notifies the change of the connection state, has a conversation relationship with itself, and identifies the state attribute of the PCE as The PCE of the stateful PCE performs state synchronization; wherein, the connection state includes: the control plane node has a new connection establishment, or the control plane node has a connection deleted.
  • the method further includes: the control plane node triggers state synchronization between the stateful PCEs according to the identified state attribute of the PCE.
  • the control plane node identifying the state attribute of the PCE includes: if the PCE floods the automatic The state attribute capability identifier bit in the discovery information identifies that the PCE is a stateful PCE, and after the control plane node receives the automatic discovery information of the PCE flooding, the control plane node identifies the status attribute capability identifier carried in the automatic discovery information.
  • the status attribute of the PCE is a stateful PCE.
  • the state synchronization between the triggered stateful PCEs includes: establishing a state synchronization relationship between the PCEs in which the state attributes of the PCE are all stateful PCEs; when the connection state transmission changes, the control plane nodes notify the change of the connection state, A PCE that has a conversational relationship with itself and recognizes that the state attribute of the PCE is a stateful PCE, and performs state synchronization. According to the state synchronization relationship established between the PCEs, it is known that the PCE that needs to perform state synchronization changes the connection state and informs it of the establishment state. Synchronous relationship of PCE;
  • the connection status includes: the control plane node has a new connection establishment, or the control plane node has a connection deleted.
  • An automatic identification system for a PCE state attribute comprising: an identification unit for the PCE to add a state attribute representation capability of the PCE in the automatic discovery information, and the PCE diffuses and propagates the state of the PCE through a flooding mechanism of the link state routing protocol
  • the control plane node receives the automatic discovery information through the link state routing protocol, and identifies the state attribute of the PCE by parsing and comparing the automatic discovery information.
  • the system further includes: a first state synchronization unit, configured to: control a plane node to trigger a state synchronization between the control plane node and the stateful PCE according to the identified state attribute of the PCE.
  • a first state synchronization unit configured to: control a plane node to trigger a state synchronization between the control plane node and the stateful PCE according to the identified state attribute of the PCE.
  • the system further includes: a second state synchronization unit, configured to control the state node to trigger state synchronization between the stateful PCEs according to the identified state attribute of the PCE.
  • the PCE of the present invention adds the state attribute representation capability of the PCE in the automatic discovery information, and the PCE diffuses and propagates the state attribute of the PCE through the flooding mechanism of the link state routing protocol; the control plane node receives the automatic discovery information through the link state routing protocol.
  • the status attribute of the PCE is identified by parsing and comparing the auto-discovery information. With the present invention, the representation capability of the PCE state attribute is increased, the PCE state attribute is propagated, and a stateful PCE is ultimately identified than the PCE state attribute.
  • the PCE automatic discovery mechanism can automatically identify the PCE status attribute.
  • FIG. 1 is a schematic structural diagram of a PCE-CAP-FLAGS sub-TLV according to the present invention
  • FIG. 2 is a schematic flowchart of an implementation process according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of an implementation process of Embodiment 2 of the present invention. detailed description
  • PCE adds the state attribute representation capability of the PCE in the automatic discovery information, and the PCE diffuses and propagates the state attribute of the PCE through the flooding mechanism of the link state routing protocol; the control plane node receives the link state routing protocol To automatically discover information, the status attribute of the PCE is identified by parsing and comparing the auto-discovery information.
  • the solution of the present invention increases the state attribute representation capability of the PCE (for example, the PCE status attribute can be identified by using the capability identification bit;), and the PCE status attribute (ie, whether it is a stateful PCE) is passed through the PCE automatic discovery mechanism. Propagation to the PCC and other PCEs ultimately identifies a stateful PCE over the PCE state attribute, thereby enabling automatic recognition of the stateful PCE.
  • An automatic identification method for PCE state attributes mainly includes the following contents: 1.
  • the present invention expands the existing PCE-CAP-FLAGS sub-TLV and adds the following content to its capability identifier:
  • the expanded PCE-CAP-FLAGS sub-TLV has the following identification bits defined in the PCE capability flag (high to low identification number), as shown in Table 4 below: BIT capability
  • the PCE adds the representation capability of the PCE's status attribute to the auto-discovery information, indicating the status attribute of the PCE itself (ie, whether the PCE is a stateful PCE).
  • the status attribute of the PCE can be represented by PCED TLV, and the status attribute of the PCE is carried by the PCE-CAP-FLAGS sub-TLV.
  • the PCE spreads and propagates the state attributes of the PCE through the flooding mechanism of the link state routing protocol.
  • the control plane node such as the PCC, receives the auto discovery information through the link state routing protocol, and the auto discovery information includes the status attribute of the PCE.
  • the control plane node such as the PCC, can parse out the state attribute of the PCE according to the pre-determination of the protocol, and compare the state attributes to identify the state attribute of the PCE.
  • Control plane nodes such as PCC trigger other functions based on the status attribute of the PCE.
  • the implementation of the present invention mainly includes steps of identifying, distributing, and identifying PCE status attributes.
  • the identification of the PCE status attribute is implemented by augmenting the PCE-CAP-FLAGS sub-TLV.
  • the PCE-CAP-FLAGS sub-TLV By adding the PCE capability flag in the PCE-CAP-FLAGS sub-TLV (the BIT bit 9 increases the PCE status attribute flag), the PCE-CAP-FLAGS sub-TLV is provided with the PCE status attribute of whether the PCE is a stateful PCE.
  • the dissemination of the PCE state attribute is performed by the flooding mechanism of the link state routing protocol.
  • identification the identification of the PCE state attribute is done by parsing and comparing the PCE-CAP-FLAGS sub-TLV. It can be seen that, compared with the prior art, the present invention expands the capability identifier of the PCE-CAP-FLAGS sub-TLV, so that the outside world can know whether a PCE is a capability attribute information of a stateful PCE through the PCE automatic discovery mechanism, and improves path calculation. Quality and efficiency, and enhanced flexibility in the implementation of other functions based on stateful PCE, such as: making PCC's choice of PCE more targeted and simplifying the PCE state synchronization process.
  • the invention is illustrated by way of example below.
  • Embodiment 1 Synchronization between a control plane node and a stateful PCE (ie, scenario 1 above). As shown in FIG. 2, this embodiment includes the following steps:
  • Step 101 The PCE-A floods automatically discovers information.
  • the automatic discovery information adds the status attribute representation capability of the PCE, specifically carrying the PCE status attribute identifier in the automatic discovery information, and the identifier is used to identify "PCE-A is a stateful PCE".
  • Step 102 The control plane node receives the automatic discovery information of the PCE-A flooding, and identifies the state attribute of the PCE-A as a state according to the definition of the relevant bit in the PCE-CAP-FLAGS sub-TLV in the automatic discovery information. PCE.
  • Step 103 The control plane node initiates a PCEP session with the PCE-A (only the PCC initiates the session).
  • Step 104 The PCEP session with the PCE-A is successfully established.
  • Step 105 The PCE-B floods the automatic discovery information, and the PCE state attribute identifier is “stateless PCE”.
  • Step 106 The control plane node receives the automatic discovery information of the PCE-B flooding, and identifies the state attribute of the PCE-B as a stateless PCE according to the definition of the relevant bit in the PCE-CAP-FLAGS sub-TLV.
  • Step 107 The control plane node initiates a PCEP session with the PCE-B (only the PCC initiates the session).
  • Step 108 The PCEP session with the PCE-B is successfully established.
  • Step 109 The control plane node has a new connection established.
  • Step 110 The control plane node notifies the new connection establishment information to the stateful PCE having a conversation relationship with itself because the PCE-A is a stateful PCE, so the PCE-A is notified.
  • PCE-B is a stateless PCE and therefore cannot be notified.
  • Step 111 The PCE-A adds connection path state information according to the notification message.
  • Step 112 The control plane node has a connection deleted.
  • Step 113 The control plane node notifies the connection deletion information to the stateful PCE having a conversation relationship with itself because the PCE-A is a stateful PCE, so the PCE-A is notified.
  • PCE-B is a stateless PCE and therefore cannot be notified.
  • Step 114 The PCE-A deletes the connection path state information according to the notification message.
  • step 101, step 102, step 105, step 106, step 109, and step 110 to step 114 are particularly critical.
  • Embodiment 2 State synchronization between stateful PCEs (ie, scenario 2 above).
  • this embodiment includes the following steps:
  • Step 201 The PCE-A floods automatically discovers information.
  • the status attribute representation capability of the PCE is added to the auto discovery information.
  • the auto discovery information carries a PCE status attribute identifier, and the identifier is used to identify that "PCE-A is a stateful PCE.”
  • Step 202: The control plane node a receives the automatic discovery information of the PCE-A flooding, and identifies the state attribute of the PCE-A as the stateful PCE according to the definition of the relevant bit in the PCE-CAP-FLAGS sub-TLV in the information. .
  • Step 203 The control plane node a initiates a PCEP session with the PCE-A (only the PCC initiates the session).
  • Step 204 The PCEP session of the control plane node a and the PCE-A is successfully established.
  • Step 205 The PCE-B floods automatically discovers information.
  • Step 206 The control plane node b receives the automatic discovery information of the PCE-B flooding, and identifies the state attribute of the PCE-B as a stateful PCE according to the definition of the relevant bit in the PCE-CAP-FLAGS sub-TLV in the information. .
  • Step 207 The control plane node b initiates a PCEP session with the PCE-B (only the PCC initiates the session).
  • Step 208 The PCEP session of the control plane node b and the PCE-B is successfully established.
  • Step 209 The PCE-B receives the automatic discovery information of the PCE-A flooding, and identifies the state attribute of the PCE-A as the stateful PCE according to the definition of the relevant bit in the PCE-CAP-FLAGS sub-TLV.
  • Step 210 The PCE-B initiates a PCEP session with the PCE-A (here only the PCE-B initiates the session).
  • Step 211 the PCEP session between PCE-A and PCE-B is established.
  • Step 212 Since PCE-A is a stateful PCE, PCE-B initiates a state synchronization relationship with PCE-A.
  • Step 213 The state synchronization relationship from the PCE-B to the PCE-A is successfully established.
  • Step 214 The PCE-A receives the automatic discovery information of the PCE-B flooding, according to the information.
  • Step 215 Since the PCE-B is a stateful PCE, the PCE-A initiates a state synchronization relationship with the PCE-B.
  • Step 216 The state synchronization relationship from PCE-A to PCE-B is established successfully.
  • Step 217 The control plane node a changes in connection state (establishment or deletion).
  • Step 218 The control plane node a notifies the connection state change information to the stateful PCE having a conversation relationship with itself, and the PCE-A is the stateful PCE, so that the PCE-A is notified.
  • PCE-B has no session relationship with node a, so no notification is obtained.
  • Step 219 The PCE-A updates the connection path state information according to the connection state change notification message.
  • Step 221 The PCE-B updates the connection path state information according to the connection state change notification message.
  • Step 223 The control plane node b notifies the connection status change information to the stateful PCE having a session relationship with itself, and the PCE-B is the stateful PCE, so that the PCE-B is notified.
  • PCE-A has no session relationship with node b, so no notification is given.
  • Step 224 The PCE-B updates the connection path state information according to the connection state change notification message.
  • Step 225 Since there is a state synchronization relationship from the PCE-B to the PCE-A, the PCE-B notifies the PCE-A of the state change information.
  • Step 226 The PCE-A updates the connection path state information according to the connection state change notification message.
  • step 201, step 202, step 206, step 209, step 212 to step 226 are particularly critical.
  • An automatic identification system for PCE status attribute comprises: an identification unit, the identification unit is used for the PCE to add a state attribute representation capability of the PCE in the automatic discovery information, and the PCE spreads and propagates the PCE through a flooding mechanism of the link state routing protocol
  • the control plane node receives the automatic discovery information through the link state routing protocol, through the automatic discovery of the information. The parsing and comparison identify the status attribute of the PCE.
  • the system further includes: a first state synchronization unit, configured to control the plane node to trigger state synchronization between the control plane node and the stateful PCE according to the identified state attribute of the PCE.
  • a first state synchronization unit configured to control the plane node to trigger state synchronization between the control plane node and the stateful PCE according to the identified state attribute of the PCE.
  • system further includes: a second state synchronization unit, configured to control the plane node to trigger state synchronization between the stateful PCEs according to the identified state attribute of the PCE.
  • a second state synchronization unit configured to control the plane node to trigger state synchronization between the stateful PCEs according to the identified state attribute of the PCE.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

La présente invention concerne un procédé pour l'identification automatique de l'attribut d'état d'un élément de calcul de chemin (PCE), le procédé comprenant les étapes suivantes : un PCE ajoute une capacité d'expression d'attribut d'état du PCE à des informations de recherche automatique, et le PCE étale et diffuse l'attribut d'état du PCE via un mécanisme d'inondation d'un protocole de routage d'état de lien; et un noeud de plan de commande reçoit les informations de recherche automatique via le protocole de routage d'état de lien, et l'attribut d'état du PCE est identifié par analyse et comparaison des informations de recherche automatique. L'invention a également pour objet un système pour l'identification automatique de l'attribut d'état d'un PCE, et une unité d'identification du système est employée pour commander le noeud de plan pour recevoir les informations de recherche automatique via le protocole de routage d'état de lien, et identifier l'attribut d'état d'un PCE par analyse et comparaison des informations de recherche automatique. Le procédé et le système de la présente invention permettent une identification automatique de l'attribut d'état d'un PCE via le mécanisme de recherche automatique de PCE.
PCT/CN2011/073814 2010-11-08 2011-05-09 Procédé et système pour l'identification automatique de l'attribut d'état d'un élément de calcul de chemin (pce) WO2012062091A1 (fr)

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