CN103312602A - Method and system for establishing paths - Google Patents
Method and system for establishing paths Download PDFInfo
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- CN103312602A CN103312602A CN201210068074XA CN201210068074A CN103312602A CN 103312602 A CN103312602 A CN 103312602A CN 201210068074X A CN201210068074X A CN 201210068074XA CN 201210068074 A CN201210068074 A CN 201210068074A CN 103312602 A CN103312602 A CN 103312602A
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Abstract
The invention discloses a method and system for establishing paths, and is applied to a scene that client layer equipment at two ends is connected by an optical transport network. The method comprises the following steps that the optical interface parameters of colored light ports which are the client layer equipment at two ends are carried to a path calculation unit, and the path calculation unit performs the path calculation for the received optical interface parameters to determine the end-to-end optical path for the client layer equipment at two ends. The technology for establishing the paths provided by the invention can establish the paths across the optical transport network in the network scene that the client layer equipment at two ends are the colored light ports.
Description
Technical field
The present invention relates to the communications field, be specifically related to a kind of method and system of setting up the path.
Background technology
In traditional light Transport Network (transmission network), client layer equipment (shown in Fig. 1 from the Tx (transmitter) among the B of manufacturer and the D of manufacturer and Rx (receiver) etc.) and at a distance the signal of communication on the UNI (User Network Interface) between another client layer equipment carried by optical transmission equipment.The equipment of UNI-C (User Network Interface-client) side generally links to each other with the interface of transport network equipment by the light mouth.UNI-N (User Network Interface-network) side is for conversion into DWDM (the Dense Wavelength Division Multiplexing that meets the transmission equipment demand with client signal by photoelectricity light (OEO) conversion, dense wavelength division multiplexing) then wavelength just carries out subsequent treatment to light signal.At receiving terminal, transfer equipment converts the DWDM light signal to white light signal to transmit client layer equipment by the OEO conversion again.
In some network design scenes, the glory mouth directly can be deployed on the equipment of UNI-C side, can effectively save cost and power consumption like this.G.698.2, ITU-T has provided the scene that the glory oral area is deployed in the UNI-C side apparatus in the motion, specifically as shown in Figure 2.
According to existing IETF WS ON (Internet Engineering Task Force Wavelength Switched Optical Network, Internet Engineering task groups wavelength switched optical network) the standard manuscript is described, need to consider wavelength constraints, FEC (Forward Error Correction, forward error correction) of transmitter, receiver etc. when setting up a path of passing through optical transfer network by control plane.But be in the scene of glory mouth at UNI-C side apparatus interface, client layer equipment adheres to different management domains separately from optical transmission equipment, the path computing information of service layer's network can not be recognized in the territory at client layer equipment place, and prior art is not supported the path computing diffusion of information of client layer is arrived client layer to service layer or with the path computing diffusion of information of service layer, so can't set up at present a path of passing through optical transfer network.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of method and system of setting up the path, passes through the foundation in the path of optical transfer network with realization.
For achieving the above object, technical scheme of the present invention is achieved in that
A kind of method of setting up the path is applied to the scene by optical transfer network connection two ends client layer equipment, and the method comprises:
The optical interface parameter of two ends client layer equipment glory mouth is carried to path-calculating element, and path-calculating element carries out path computing for the optical interface parameter of receiving, for two ends client layer equipment is determined the end-toend lightpath footpath.
The described method that the optical interface parameter of two ends client layer equipment glory mouth is carried to path-calculating element is:
Path in the client layer equipment of two ends is set up first node and is gathered by the optical interface constraint information of the call mechanism among the RFC4974 with two ends client layer equipment, then passes to path-calculating element.
When the path is set up first node and carried out described gathering, use the glory mouth parameter information of acknowledgement message exchange two ends client layer equipment, then these parameter informations are sent to the described path-calculating element of optical transport network.
The method also comprises:
In advance the link capability LINK_CAPABILITY object among the RFC4974 is expanded, be used for using the required parameter information of the described path computing of object interaction after expanding.
The described object of expansion comprises:
Wavelength retrains subobject, is used to indicate the constraint information of wavelength, wherein comprises the wavelength bind field;
Forward error correction FEC retrains subobject, is used to indicate the constraint information of FEC, comprises the FEC constraint information of interface;
Modulation format retrains subobject, is used to indicate the constraint information of modulation format, comprises the modulation format constraint information of interface.
A kind of system that sets up the path is applied to the scene by optical transfer network connection two ends client layer equipment, and this system comprises path-calculating element; Be used for receiving the optical interface parameter from two ends client layer equipment glory mouth, and carry out accordingly path computing, for two ends client layer equipment is determined the end-toend lightpath footpath.
Comprise in the client layer equipment of described two ends that the path sets up first node; When described path-calculating element receives optical interface parameter from two ends client layer equipment glory mouth, first node is set up in described path, be used for: the call mechanism by RFC4974 gathers the optical interface constraint information of two ends client layer equipment, then passes to path-calculating element.
When the path is set up first node and carried out described gathering, be used for: use the glory mouth parameter information of acknowledgement message exchange two ends client layer equipment, then these parameter informations are sent to the described path-calculating element of optical transport network.
Described two ends client layer equipment also is used for:
In advance the LINK_CAPABILITY object among the RFC4974 is expanded, be used for using the required parameter information of the described path computing of object interaction after expanding.
The described object of expansion comprises:
Wavelength retrains subobject, is used to indicate the constraint information of wavelength, wherein comprises the wavelength bind field;
FEC retrains subobject, is used to indicate the constraint information of FEC, comprises the FEC constraint information of interface;
Modulation format retrains subobject, is used to indicate the constraint information of modulation format, comprises the modulation format constraint information of interface.
The present invention sets up the technology in path, is in the network scenarios of glory mouth at two ends client layer equipment, can set up the path of crossing over optical transport network.
Description of drawings
Fig. 1 is traditional multi-manufacturer DWDM network structure;
Fig. 2 is for utilizing the multi-manufacturer DWDM structure chart of black link (black link);
Fig. 3 is the network scenarios schematic diagram of the embodiment of the invention;
Fig. 4 is the wavelength constraint subobject schematic diagram of the embodiment of the invention;
Fig. 5 is the FEC constraint subobject schematic diagram of the embodiment of the invention;
Fig. 6 is the modulation format constraint subobject schematic diagram of the embodiment of the invention;
Fig. 7 is the general flow chart that the embodiment of the invention is set up the path.
Embodiment
In actual applications, the UNI-C side apparatus sends to self optical interface parameter (wavelength information of supporting such as optical interface etc.) PCE (path-calculating element) in light territory, when the path-calculating element in the light territory carries out path computing with the optical interface parameter of the UNI-C side apparatus constraints as path computing, the path-calculating element in light territory just has and sets up the needed parameter information of end-to-end light path like this, therefore can set up end to end path.Path-calculating element is finished after the path computing, and the parameter of client layer optical interface is returned to client layer UNI-C side gusset, initiates the signaling road construction.
The present invention has provided a kind of scheme, so that be in the network scenarios of glory mouth at UNI-C equipment, by using the call mechanism among the RFC (Request for Comments, request suggestion) 4974, can set up the path of crossing over optical transport network.
The aforesaid operations thinking both can have been supported the foundation of one way link in the signaling road construction process, also can support the foundation of two-way link.
Concrete elaboration can be referring to Fig. 3, in network design scene shown in Figure 3, Client Network (customer network) 1, customer network 2 and customer network 3 are non-optical transport network, and it is the glory mouth that A1, D1 and C1 are connected to the interface that transmits network, is the UNI-C side interface.B1, B2 and B3 are optical transport network side UNI-N interface, description according to existing WSON standard, need to flood to path-calculating element by the path computing constraints (comprise wavelength, FEC, modulation format etc.) of Routing Protocol with optical transport network, then be responsible for the path computing of optical transfer network by path-calculating element.But because A1, D1 adhere to different management domains with the C1 node separately with the optical transfer network network, the UNI-C side glory mouth parameter of A1, D1 and C1 node can't be flooded to optical transport network with the constraint information of path computing by Routing Protocol, thereby path-calculating element can't calculate an end-toend lightpath footpath.The path is set up first node and can be gathered by the optical interface constraint information of the call mechanism among the RFC4974 with two ends UNI-C side, then passes to path-calculating element and calculates a qualified end-to-end light path.
According to the description flow process among the RFC4974, set up in the process of path by signaling, at first setting up first node (namely as calling out the UNI-C side gusset of initiating node) by the path makes a call and sets up process, in the process of call setup, use Notify (notice) message exchanges the glory mouth parameter information that node (such as Tx)/termination node (such as Rx) is initiated in the calling that is positioned at two ends, these information comprise the wavelength constraint information that transmitter receiver is supported, the FEC available information, modulation format information etc., then these parameter informations are sent to the PCE of optical transport network by the PCEP agreement, PCE calculates after the suitable path, result of calculation is returned to call out initiate node to initiate establishment of connection.
Be that example is made expansion for the LINK_CAPABILITY among the RFC4974 (link capability) object among the present invention, be used in the path computing process, needing alternately the parameter information considered at calling procedure.Node is initiated/terminated in described calling also can be referred to as calling head and the tail node, namely calls out the initiation node and is called the first node of calling, and the call ending node is called the calling tail node.
Embodiment:
Wavelength retrains subobject, is used to indicate the constraint information of wavelength, wherein comprises the wavelength bind field, according to the description in [WSON-encode] manuscript, wherein can comprise some wavelength constraints information.For example call out the glory mouth of initiating node/call ending node for certain as shown in Figure 4, can include the constraints information of wavelength/the go out constraints information of wavelength, can be wavelength available inventory, wavelength available scope with the constraints information subdivision that enters the constraints information of wavelength/go out wavelength further, get rid of the wavelength inventory, get rid of the information such as wave-length coverage.The coded format of wavelength information can be consulted [WSON-encode].Calling head and the tail node carries wavelength constraint subobject according to the call flow among the RFC4974 and obtains wavelength available information in the LINK_CAPABILITY object.
FEC retrains subobject, is used to indicate the constraint information of FEC, according to the description in [WSON-encode] manuscript, wherein can comprise the FEC constraint information of some interfaces.For example shown in Figure 5ly call out the glory mouth of initiating node/call ending node for certain, can include/go out the constraint information of FEC, according to the description in [WSON-encode] manuscript, further the constraint information of the FEC that comes in and goes out can be divided into the specific FEC type information of information and manufacturer of standard FEC, the specific coding form can be consulted [WSON-encode].Calling head and the tail node carries FEC constraint subobject according to the call flow among the RFC4974 and obtains available FEC information in the LINK_CAPABILITY object.
Modulation format retrains subobject, is used to indicate the constraint information of modulation format, according to the description in [WSON-encode] manuscript, can comprise the modulation format constraint information of some interfaces.For example shown in Figure 6ly call out the glory mouth of initiating node/call ending node for certain, can be incorporated into/go out the constraint information of modulation format, according to the description in [WSON-encode] manuscript, further the constraint information that enters out modulation format can be divided into the specific modulation format information of information and manufacturer of standard modulation format, the specific coding form can be consulted [WSON-encode].Calling head and the tail node carries modulation format constraint subobject according to the call flow among the RFC4974 and obtains available modulation format information in the LINK_CAPABILITY object.
Based on above-mentioned expansion, can carry out following path computing:
In scene shown in Figure 3, suppose need to calculate the path of from the customer network 1 A3 node leap optical transport network of C3 node in the customer network 3.
1), set up the flow process in path according to RSVP-TE (based on the RSVP of traffic engineering) signaling, the A3 node sends path (path) message to be established to the end-to-end path of C3.Carry ERO (Explicit Route Obiect, explicit path object) in the Path message take the path of indicating required explicit process as A3-A1-Transport Network-Client Network 3.
2), when path message arrives the A1 node, the A1 node is at first blocked the road construction of RSVP-TE signaling, then the A1 node can release news according to configuration information or the route of the ERO information of carrying in the path message and node, determine to check that at first A1 is to whether FA (the Forward Adiacency that has set up is arranged between the C1, forwarding adjacency), if there is not available forwarding adjacency link, then trigger a new RSVP-TE signaling process to set up the forwarding adjacency path of A1-C1, the foundation of namely passing through the FA of optical transport network.Specifically can take following mode to set up FA:
I), the A1 node at first sends Notify message to the C1 node according to the step that defines among the RFC4974, carry the LINK_CAPABILITY object that defines among the present invention in the Notify message and (comprise wavelength constraint subobject in the LINK_CAPABILITY object, FEC constraint subobject and modulation format constraint subobject), the C1 node is after receiving the Notify message that A1 sends over, according to the own wavelength available information of supporting itself, FEC available information and modulation format available information are determined A1 and the common wavelength available of supporting of C1 node, after FEC and the modulation format information, feed back a Notify message to equally carrying the wavelength available that A1 and C1 all support with the LINK_CAPABILITY object in the A1 node Notify message, FEC and modulation format information, the A1 node has just had the constraint information of two ends optical interfaces like this.
Ii), the keeper should do local configuration at the A1 node in advance, if when needing calculating to pass through the path of optical transfer network, then send PCReq (path computing request message) message to the path-calculating element of optical transport network, this moment, the A1 node comprised the more specific location information of being responsible for calculating the path-calculating element that passes through optical transport network in local information.Then the A1 node sends PCReq message to the path-calculating element of optical transfer network, PCReq message can be utilized WA (Wavelength Assignment, wavelength assignment) object carries the constraint information (constraint information comprises the available information of wavelength, FEC and modulation format) of the optical interface parameter of source node and destination node, and concrete coded format is seen described in [draft-lee-pce-wson-rwa-ext] manuscript.Path-calculating element carries out after the path computing, will have the PCRep message feedback of the configuration informations such as suitable wavelength, FEC, modulation format to the A1 node, comprises the configuration information such as wavelength, FEC, modulation format of A1 node and C1 node in this PCRep message.
Iii), the PCRep message returned according to path-calculating element of A1 node, use signaling to set up A1 to the path of C1, in the process of signaling road construction, use the signaling format in [WSON-signaling], utilize ERO carry path after the calculating the parameter configuration of each node of process.After the road construction success, the path between the A1-C1 is notified to A1 node and customer network as FA.
3), the A1 node continues the signaling process of blocking-up, to set up the path of complete end-to-end A3-C3.
In conjunction with above description as seen, the operation thinking that the present invention sets up the path can represent flow process as shown in Figure 7, and this flow process may further comprise the steps:
Step 710: the optical interface parameter of two ends client layer equipment (such as the equipment of UNI-C side) glory mouth is carried to path-calculating element.
Step 720: path-calculating element carries out path computing for the optical interface parameter of receiving, for two ends client layer equipment is determined the end-toend lightpath footpath.
In sum as seen, no matter be method or system, the present invention sets up the technology in path, is in the network scenarios of glory mouth at two ends client layer equipment, can set up the path of crossing over optical transport network.
The above is preferred embodiment of the present invention only, is not for limiting protection scope of the present invention.
Claims (10)
1. a method of setting up the path is applied to the scene by optical transfer network connection two ends client layer equipment, it is characterized in that, the method comprises:
The optical interface parameter of two ends client layer equipment glory mouth is carried to path-calculating element, and path-calculating element carries out path computing for the optical interface parameter of receiving, for two ends client layer equipment is determined the end-toend lightpath footpath.
2. method according to claim 1 is characterized in that, the described method that the optical interface parameter of two ends client layer equipment glory mouth is carried to path-calculating element is:
Path in the client layer equipment of two ends is set up first node and is gathered by the optical interface constraint information of the call mechanism among the RFC4974 with two ends client layer equipment, then passes to path-calculating element.
3. method according to claim 2, it is characterized in that, when the path is set up first node and carried out described gathering, use the glory mouth parameter information of acknowledgement message exchange two ends client layer equipment, then these parameter informations are sent to the described path-calculating element of optical transport network.
4. according to claim 1 to 3 each described methods, it is characterized in that, the method also comprises:
In advance the link capability LINK_CAPABILITY object among the RFC4974 is expanded, be used for using the required parameter information of the described path computing of object interaction after expanding.
5. method according to claim 4 is characterized in that, the described object of expansion comprises:
Wavelength retrains subobject, is used to indicate the constraint information of wavelength, wherein comprises the wavelength bind field;
Forward error correction FEC retrains subobject, is used to indicate the constraint information of FEC, comprises the FEC constraint information of interface;
Modulation format retrains subobject, is used to indicate the constraint information of modulation format, comprises the modulation format constraint information of interface.
6. a system that sets up the path is applied to the scene by optical transfer network connection two ends client layer equipment, it is characterized in that, this system comprises path-calculating element; Be used for receiving the optical interface parameter from two ends client layer equipment glory mouth, and carry out accordingly path computing, for two ends client layer equipment is determined the end-toend lightpath footpath.
7. system according to claim 6 is characterized in that, comprises in the client layer equipment of described two ends that the path sets up first node; When described path-calculating element receives optical interface parameter from two ends client layer equipment glory mouth, first node is set up in described path, be used for: the call mechanism by RFC4974 gathers the optical interface constraint information of two ends client layer equipment, then passes to path-calculating element.
8. system according to claim 7, it is characterized in that, when the path is set up first node and carried out described gathering, be used for: use the glory mouth parameter information of acknowledgement message exchange two ends client layer equipment, then these parameter informations are sent to the described path-calculating element of optical transport network.
9. according to claim 6 to 8 each described systems, it is characterized in that, described two ends client layer equipment also is used for:
In advance the LINK_CAPABILITY object among the RFC4974 is expanded, be used for using the required parameter information of the described path computing of object interaction after expanding.
10. system according to claim 9 is characterized in that, the described object of expansion comprises:
Wavelength retrains subobject, is used to indicate the constraint information of wavelength, wherein comprises the wavelength bind field;
FEC retrains subobject, is used to indicate the constraint information of FEC, comprises the FEC constraint information of interface;
Modulation format retrains subobject, is used to indicate the constraint information of modulation format, comprises the modulation format constraint information of interface.
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