CN101764732B

CN101764732B - Method, network and node device for establishing Ethernet virtual connection

Info

Publication number: CN101764732B
Application number: CN200810187916.7A
Authority: CN
Inventors: 孙俊
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2008-12-23
Filing date: 2008-12-23
Publication date: 2012-11-07
Anticipated expiration: 2028-12-23
Also published as: CN101764732A

Abstract

The invention discloses a method, a network and a device for establishing the Ethernet virtual connection, and the method comprises the following steps: using an inlet UNI-N node to receive a first request message from a UNI-C node, sending a second request message to an outlet UNI-N node through an established Ethernet virtual chain, and using the outlet UNI-N node to send a third request message to the outlet UNI-C node, wherein parameters in the first, the second and the third request messages represent that the requested connection is the Ethernet virtual connection and requested labels are MPLS labels; using the outlet UNI-C node to return the MPLS label of an upstream in-interface of the outlet UNI-C node to the outlet UNI-N node according to the parameters which are carried in the third request message, using the outlet UNI-N node to establish a forward MPLS label forward item according to the MPLS label of the upstream in-interface of the outlet UNI-C node and the MPLS label of the upstream in-interface of the outlet UNI-N node; and using the inlet UNI-N node to establish the forward MPLS label forward item according to the upstream in-interface label returned by the outlet UNI-N node and the MPLS label of the upstream in-interface of the inlet UNI-N node and returning the MPLS label of the upstream in-interface of the inlet UNI-N node to the inlet UNI-C node. Therefore, the establishment efficiency is improved.

Description

Set up method, network and node device that Ethernet virtual connects

Technical field

The present invention relates to communication technical field, relate in particular to and set up method, network and the node device that Ethernet virtual connects (EVC, Ethernet Virtual Connection).

Background technology

ASON (ASON; Automatically Switched Optical Network) through between the transmission plane of conventional optical network and management plane, introducing control plane; Because control plane has used based on Internet protocol (IP; International Protocol) LMP Link Manager Protocol (LMP; Link Management Protocol), OSPF-traffic engineering (OSPF-TE, Open Shortest Path First-Traffic Engineering) and RSVP-traffic engineering (RSVP-TE, Resource Reservation Protocol-Traffic Engineering) agreement; Thereby have automatic neighbours, automatic link and automatic topological discover function, and professional end-to-end automatic establishment function.

Along with the all-IPization of business, the flattening of network, IP+ light will be main network configuration form.The IP+ optical tech transmits lot of data and voice with the light velocity through optical-fiber network between different network nodes; It is to link to each other through the circuit or two class interfaces that divide into groups at data/transport plane level; The interface of circuit types comprises the packet (POS that is carried on Synchronous Digital Hierarchy of various speed; Packet Over SDH) and G.709 (ashen light or glory) interface etc., the packet type interface comprises Ethernet interface (GE, the 10GE of various speed; 40GE etc.) and asynchronous transfer mode (ATM, Asynchronous Transfer Mode) interface.And at the key-course surface layer, mainly be to link to each other through User Network Interface (UNI, User Network Interface), realize the interaction of IP layer photoreactive layer.Owing to carrying professional economy of IPization and bandwidth reason flexibly, IP+ light increases through the interconnected ratio of Ethernet gradually, has become trend.

According to the definition of Metro Ethernet Forum (MEF, Metro Ethernet Forum), the Ethernet Private Line business is divided into Ethernet Private Line (EPL; Ethernet Private Line) and EVPL (EVPL; Ethernet Virtual Private Line), wherein, EPL is based on port exchange; And EVPL is based on VLAN (VLAN; Virtual Local Area Network) label exchange, the UNI-N node will be discerned the VLAN label in the ether bag that the UNI-C node sends in the EVPL business, and intersects according to the VLAN of configuration; The ether bag is connected (EVC, Ethernet Virtual Connection) through certain Ethernet virtual to send.

But; Because the part router is to multiprotocol label switching (MPLS; Multi-Protocol Label Switching) support is better than the support to VLAN; Also provide a kind of EVPL based on MPLS professional in the prior art, this technology is with similar based on the EVPL of VLAN label exchange, and difference is that the switch label that uses in the ether bag is the MPLS label.For providing EVPL professional, need set up EVC, be to create realization at present through the mode of NMS (NMS, Network Management System) pointwise configuration on the optical node of business process.

But the inventor finds in the process that above-mentioned technology is studied and put into practice: in the method for the above-mentioned EVC of foundation, need be to the optical node pointwise manual configuration MPLS label forwarding item of process, so efficient is lower.

Summary of the invention

Embodiment of the invention technical problem to be solved is to set up the method for EVC, network and node device, can improve the efficient of setting up based on the EVC of MPLS.

At first, the embodiment of the invention provides the method for a kind of EVC of foundation, and this method comprises:

Portal users network interface network side UNI-N node receives first request message from portal users network interface client side UNI-C node; The connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is a multiprotocol label switching MPLS label; According to the parameter of carrying in said first request message; Ethernet virtual chain road direction outlet UNI-N node through being set up between inlet UNI-N node and the outlet UNI-N node sends second request message; The connection that carries the parametric representation request in said second request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

Outlet UNI-N node is according to the parameter of carrying in said second request message; Send the 3rd request message to outlet UNI-C node; The connection that carries the parametric representation request in said the 3rd request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

Outlet UNI-C node is according to the parameter in said the 3rd request message; The MPLS label that distributes outlet UNI-C node upper reaches incoming interface; And return first response message to outlet UNI-N node, carry the MPLS label of the outlet UNI-C node upper reaches incoming interface that outlet UNI-C node distributes in said first response message;

After outlet UNI-N node receives said first response message; The MPLS label that distributes outlet UNI-N node upper reaches incoming interface; And according to the MPLS label of said outlet UNI-C node upper reaches incoming interface and the MPLS label that exports the outlet UNI-N node upper reaches incoming interface of UNI-N node distribution; Set up forward MPLS label forwarding item on the data forwarding plane; And return second response message to inlet UNI-N node, carry the MPLS label of the outlet UNI-N node upper reaches incoming interface that outlet UNI-N node distributes in said second response message;

After inlet UNI-N node receives said second response message; The MPLS label that distributes inlet UNI-N node upper reaches incoming interface; And the MPLS label of the inlet UNI-N node upper reaches incoming interface that distributes according to the MPLS label and the said inlet UNI-N node of said outlet UNI-N node upper reaches incoming interface; Set up forward MPLS label forwarding item on the data forwarding plane; And return the 3rd response message to inlet UNI-C node, carry the MPLS label of the inlet UNI-N node upper reaches incoming interface that inlet UNI-N node distributes in said the 3rd response message.

The embodiment of the invention also provides a kind of EVPL of realization professional network; This network comprises inlet UNI-C node, inlet UNI-N node, outlet UNI-N node and outlet UNI-C node; Said inlet UNI-C node comprises first transmitting element and first receiving element; Said inlet UNI-N node comprises that second receiving element, second transmitting element, the 3rd receiving element, the first label distribution unit, forward MPLS label forwarding item set up unit, the 3rd transmitting element and Ethernet virtual link establishment unit; Said outlet UNI-N node comprises that second receiving element, second transmitting element, the 3rd receiving element, the first label distribution unit, forward MPLS label forwarding item set up unit and the 3rd transmitting element, and said outlet UNI-C node comprises the 4th receiving element, the 3rd label distribution unit and the 4th transmitting element;

Said first transmitting element; Be used for sending first request message to inlet UNI-N node; The connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label, said first receiving element; Be used to receive the 3rd response message that inlet UNI-N node returns, carry the MPLS label of the inlet UNI-N node upper reaches incoming interface of inlet UNI-N node distribution in said the 3rd response message;

Second receiving element of said inlet UNI-N node; Be used to receive first request message that said inlet UNI-C node sends; The connection that carries the parametric representation request in said first request message is the Ethernet virtual connection and carries the ethernet traffic engineering parameter; And the label of being asked is the MPLS label; Said Ethernet virtual link establishment unit; Be used for setting up Ethernet virtual link between inlet UNI-N node and the outlet UNI-N node according to the ethernet traffic engineering parameter of said first request message; Second transmitting element of said inlet UNI-N node is used for the parameter of carrying according to said first request message, sends second request message through the Ethernet virtual chain road direction outlet UNI-N node of being set up between inlet UNI-N node and the outlet UNI-N node; The connection that carries the parametric representation request in said second request message is that Ethernet virtual connects; And the label of being asked is the MPLS label, and the 3rd receiving element of said inlet UNI-N node is used to receive second response message that outlet UNI-N node returns; Carry the MPLS label of the outlet UNI-N node upper reaches incoming interface of outlet UNI-N node distribution in said second response message; The first label distribution unit of said inlet UNI-N node is used for the MPLS label according to said second response message distribution inlet UNI-N node upper reaches incoming interface, and the forward MPLS label forwarding item of said inlet UNI-N node is set up the unit; Be used for according to the MPLS label of said inlet UNI-N node upper reaches incoming interface and the MPLS label that exports the outlet UNI-N node upper reaches incoming interface of UNI-N node distribution; Set up the 3rd transmitting element of the said inlet of forward MPLS label forwarding item UNI-N node on the data forwarding plane, be used for returning the 3rd response message, carry the MPLS label of the inlet UNI-N node upper reaches incoming interface of inlet UNI-N node distribution in said the 3rd response message to inlet UNI-C node;

Second receiving element of said outlet UNI-N node; Be used to receive first request message that said inlet UNI-N node sends; The connection that carries the parametric representation request in said first request message is that Ethernet virtual connects; And the label of being asked is the MPLS label; Second transmitting element of said outlet UNI-N node is used for the parameter of carrying according to said second request message, sends the 3rd request message to outlet UNI-C node; The connection that carries the parametric representation request in said the 3rd request message is that Ethernet virtual connects; And the label of being asked is the MPLS label, and the 3rd receiving element of said outlet UNI-N node is used to receive first response message that outlet UNI-C node returns; Carry the MPLS label of the outlet UNI-C node upper reaches incoming interface of outlet UNI-C node distribution in said first response message; The first label distribution unit of said outlet UNI-N node is used for distributing the MPLS label that exports UNI-N node upper reaches incoming interface according to said first response message, and the forward MPLS label forwarding item of said outlet UNI-N node is set up the unit; Be used for according to the MPLS label of said outlet UNI-C node upper reaches incoming interface and the MPLS label that exports the outlet UNI-N node upper reaches incoming interface of UNI-N node distribution; Set up the 3rd transmitting element of the said outlet of forward MPLS label forwarding item UNI-N node on the data forwarding plane, be used for returning second response message, carry the MPLS label of the outlet UNI-N node upper reaches incoming interface of outlet UNI-N node distribution in said second response message to inlet UNI-N node;

Said the 4th receiving element; Be used to receive the 3rd request message of second transmitting element transmission that exports the UNI-N node; Said the 3rd label distribution unit; Be used for parameter, distribute the MPLS label of outlet UNI-C node upper reaches incoming interface, said the 4th transmitting element according to said the 3rd request message; Be used for returning first response message, carry the MPLS label of the outlet UNI-C node upper reaches incoming interface of the 3rd label distribution unit distribution that exports the UNI-C node in said first response message to outlet UNI-N node.

The embodiment of the invention also provides following node device: another kind of node device; This node device comprises: second receiving element, second transmitting element, the 3rd receiving element, the first label distribution unit, forward MPLS label forwarding item are set up unit and the 3rd transmitting element; Wherein: second receiving element; Be used to receive first request message that upstream node sends; The connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

Second transmitting element; Be used for sending second request message to downstream node according to the parameter that said first request message carries; The connection that carries the parametric representation request in said second request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

The 3rd receiving element is used to receive pairing first response message of said second request message that downstream node sends, and carries the MPLS label of the upper reaches incoming interface of the said downstream node that said downstream node distributes in said first response message;

The first label distribution unit, first response message that is used for receiving according to the 3rd receiving element distributes the MPLS label of this node device upper reaches incoming interface;

Forward MPLS label forwarding item is set up the unit, and the MPLS label that the MPLS label that first response message that is used for receiving according to the 3rd receiving element is entrained and the first label distribution unit are distributed is set up forward MPLS label forwarding item;

The 3rd transmitting element is used for upstream nodes and sends pairing second response message of said first request message, carries the said first label distribution unit institute distributed labels in said second response message.

It is thus clear that; In the embodiment of the invention; Through expansion UNI agreement, send first request message by inlet UNI-C node, when inlet UNI-N node receives said first request message; The Ethernet virtual chain road direction outlet UNI-N node that passes through to be set up sends second request message; Outlet UNI-N node sends the 3rd request message to outlet UNI-C node, and all carrying parameter in said first request message, second request message and the 3rd request message is that Ethernet virtual connects in order to being connected of expression request, and the label of being asked is the MPLS label; Outlet UNI-C node is according to the parameter of carrying in said the 3rd request message; The MPLS label of the outlet UNI-N node upper reaches incoming interface that the MPLS label of the outlet UNI-C node upper reaches incoming interface that distributes to outlet UNI-N node Returning outlet UNI-C node, outlet UNI-N node distribute according to the MPLS label and the outlet UNI-N node of said outlet UNI-C node upper reaches incoming interface is set up forward MPLS label forwarding item on the data forwarding plane; The MPLS label of the inlet UNI-N node upper reaches incoming interface that outlet UNI-N node upper reaches incoming interface label that inlet UNI-N node returns according to outlet UNI-N node again and inlet UNI-N node distribute; Set up forward MPLS label forwarding item on the data forwarding plane, and return the MPLS label of inlet UNI-N node upper reaches incoming interface to inlet UNI-C node.Said connection method for building up is by initiating between the node voluntarily, automatically configuration the MPLS label forwarding item of each node of process, do not need pointwise to carry out manual configuration, therefore can improve Ethernet virtual establishment of connection efficient based on MPLS.

Description of drawings

Fig. 1 is an interface definition sketch map in the embodiment of the invention;

Fig. 2 is the method flow diagram that the embodiment of the invention one is set up EVC;

Fig. 3 is the method signaling process figure that the embodiment of the invention two is set up EVC;

Fig. 4 is the method signaling process figure that the embodiment of the invention three is set up EVC;

Fig. 5 is node device one structural representation in the embodiment of the invention;

Fig. 6 is node device two structural representations in the embodiment of the invention;

Fig. 7 is node device three structural representations in the embodiment of the invention;

Fig. 8 is node device four structural representations in the embodiment of the invention;

Fig. 9 is node device five structural representations in the embodiment of the invention;

Figure 10 is node device six structural representations in the embodiment of the invention;

Figure 11 is node device seven structural representations in the embodiment of the invention;

Figure 12 realizes the schematic network structure that EVPL is professional in the embodiment of the invention.

Embodiment

The embodiment of the invention provides method, network and the node device of setting up EVC, can improve the efficient of setting up based on the EVC of MPLS.

At first; For describing conveniently; Notion related in the present specification is carried out as giving a definition: the professional source node of initiating of definition is an Ingress node; Like portal users network interface client side (UNI-C, User-Network-Interface Client Side) node, portal users network interface network side (UNI-N, User-Network-Interface Network side) node; The professional destination node that stops is an Egress node, like outlet UNI-C node, outlet UNI-N node.The transmission direction of definition message from the source node to the destination node is forward; The transmission direction of definition message from the destination node to the source node is reverse; Promptly definition inlet UNI-C node is a forward to exporting the UNI-C node; Inlet UNI-N node is a forward to exporting the UNI-N node, and outlet UNI-C node to UNI-C node and outlet UNI-N node to the UNI-N node that enters the mouth that enters the mouth is for reverse.With respect to present node, be upstream node near the node of source node, be downstream node near the node of destination node.For example, inlet UNI-C node is the upstream node of inlet UNI-N node, and inlet UNI-N node is the upstream node of outlet UNI-N node, and outlet UNI-N node is the upstream node of outlet UNI-C node.For the node between source node and destination node; Can be mutual through 4 uni interfaces and adjacent upstream and downstream node; For describing conveniently, definition is a upper reaches incoming interface near the interface of source node and message signale input, is the downstream outgoing interface near the interface of destination node and message signale output; For two-way services, the interface that also defines near the input of destination node and message signale is the downstream incoming interface, is upper reaches outgoing interface near the interface of source node and message signale output.With reference to Fig. 1, be interface definition sketch map in the embodiment of the invention, A, B, three nodes of C are arranged respectively, A is a source node; C is a destination node, and B is the intermediate node between A and the C, and then A is the upstream node of B; C is the downstream node of B, and B is the downstream node of A, the upstream node of C, and B has 4 interfaces; Interface 1 is that upper reaches incoming interface, interface 2 are the downstream outgoing interface, and interface 3 is the downstream incoming interface, and interface 4 is a upper reaches outgoing interface.Each node all can distribute the upstream and downstream incoming interface of this node and the MPLS label of upstream and downstream outgoing interface.If no special instructions; The upstream and downstream incoming interface that certain node distributes and the label of upstream and downstream outgoing interface all refer to the label of this node upstream and downstream incoming interface and upstream and downstream outgoing interface, but not refer to the upstream and downstream incoming interface of its upstream node or downstream node and the label of upstream and downstream outgoing interface.

For the purpose, technical scheme and the advantage that make the embodiment of the invention more cheer and bright, below with reference to accompanying drawing, the embodiment of the invention is elaborated:

With reference to Fig. 2, set up the method flow diagram of EVC for the embodiment of the invention one, concrete steps are following:

S201, inlet UNI-N node receive first request message from inlet UNI-C node, and the connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

S202, inlet UNI-N node are according to the parameter of carrying in said first request message; Ethernet virtual chain road direction outlet UNI-N node through being set up between inlet UNI-N node and the outlet UNI-N node sends second request message; The connection that carries the parametric representation request in said second request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

S203, outlet UNI-N node are according to the parameter of carrying in said second request message; Send the 3rd request message to outlet UNI-C node; The connection that carries the parametric representation request in said the 3rd request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

In this step; Outlet UNI-N node is according to the parameter of carrying in said second request message; Confirm that the connection that the request of inlet UNI-N node is set up is that Ethernet virtual connects, and the label of being asked is the MPLS label, outlet UNI-N node sends the 3rd request message to outlet UNI-C node; The connection that carries the parametric representation request in said the 3rd request message is that Ethernet virtual connects, and the label of being asked is the MPLS label.

S204, outlet UNI-C node are according to the parameter in said the 3rd request message; The MPLS label that distributes outlet UNI-C node upper reaches incoming interface; And return first response message to outlet UNI-N node, carry the MPLS label of the outlet UNI-C node upper reaches incoming interface that outlet UNI-C node distributes in said first response message;

In this step; Outlet UNI-C node is according to the parameter of carrying in said the 3rd request message; Confirm that the connection that the request of outlet UNI-N node is set up is that Ethernet virtual connects, and the label of being asked is the MPLS label, outlet UNI-C node distributes the MPLS label of outlet UNI-C node upper reaches incoming interface; And return first response message to outlet UNI-N node, carry the MPLS label of the outlet UNI-C node upper reaches incoming interface that outlet UNI-C node distributes in said first response message.

After S205, outlet UNI-N node receive first response message; The MPLS label that distributes outlet UNI-N node upper reaches incoming interface; And according to the MPLS label of said outlet UNI-C node upper reaches incoming interface and the MPLS label that exports the outlet UNI-N node upper reaches incoming interface of UNI-N node distribution; Set up forward MPLS label forwarding item on the data forwarding plane; And return second response message to inlet UNI-N node, carry the MPLS label of the outlet UNI-N node upper reaches incoming interface that outlet UNI-N node distributes in said second response message;

Wherein, the IP network device systems mainly is made up of two planes: data forwarding plane and route control plane.The route control plane is so long as be responsible for the processing of Routing Protocol; Routing table and the generation of transmitting; Functions such as management interface outwards are provided; Because these do not need the disposal ability of linear speed, just need to add various characteristics neatly, therefore often use high performance CPU just can satisfy the requirement of route control plane; And the data forwarding plane mainly is to be responsible for packet to receive, and tables look-up, and classification is filtered, and Qos processing and exchange etc. are processing capacity in real time.

In the MPLS system, route control plane (Control Plane) is connectionless, utilizes existing IP network to realize; Data forwarding plane (Forwarding Plane is also referred to as datum plane, Data Plane) is connection-oriented, can use double layer networks such as ATM, frame relay.MPLS uses short and the label (label) of fixed length comes encapsulating packets, realizes transmitting fast at datum plane.At control plane, MPLS has the powerful routing function flexibly of IP network, can satisfy the requirement of various new application to network.

Outlet UNI-N node is with the MPLS label of the outlet UNI-C node upper reaches incoming interface that is distributed by outlet UNI-C node that carries in first response message MPLS label as outlet UNI-N node downstream outgoing interface; And the MPLS label of distribution outlet UNI-N node upper reaches incoming interface; Then can set up forward MPLS label forwarding item on the data forwarding plane according to the label of said outlet UNI-N node upper reaches incoming interface and the label of downstream outgoing interface.If the MPLS label list that upper reaches incoming interface is corresponding is shown upper reaches incoming interface. label; The MPLS label list that the downstream outgoing interface is corresponding is shown the downstream outgoing interface. label; Then forward MPLS label forwarding item can be expressed as: outlet UNI-N node upper reaches incoming interface. label → outlet UNI-N node downstream outgoing interface. and label, " → " expression mapping relations.When outlet UNI-N node receives the packet of inlet UNI-N node direction transmission through outlet UNI-N node upper reaches incoming interface; Can be according to said forward MPLS label forwarding item with the outlet UNI-N node upper reaches incoming interface node in the MPLS head. label replaces with outlet UNI-N node downstream outgoing interface. label, then packet is transmitted through outlet UNI-N node downstream outgoing interface.

After S206, inlet UNI-N node receive second response message; The MPLS label that distributes inlet UNI-N node upper reaches incoming interface; And the MPLS label of the inlet UNI-N node upper reaches incoming interface that distributes according to the MPLS label and the inlet UNI-N node of said outlet UNI-N node upper reaches incoming interface; Set up forward MPLS label forwarding item on the data forwarding plane; And return the 3rd response message to inlet UNI-C node, carry the MPLS label of the inlet UNI-N node upper reaches incoming interface that inlet UNI-N node distributes in said the 3rd response message.

Equally; The MPLS label of the outlet UNI-N node upper reaches incoming interface that inlet UNI-N node distributes the outlet UNI-N node that carries in second response message is as the MPLS label of inlet UNI-N node downstream outgoing interface; And the MPLS label of distribution inlet UNI-N node upper reaches incoming interface; Then can set up forward MPLS label forwarding item on the data forwarding plane according to the label of said inlet UNI-N node upper reaches incoming interface and the label of inlet UNI-N node downstream outgoing interface.If the MPLS label list that upper reaches incoming interface is corresponding is shown upper reaches incoming interface. label; The MPLS label list that the downstream outgoing interface is corresponding is shown the downstream incoming interface. label; Then forward MPLS label forwarding item can be expressed as: inlet UNI-N node upper reaches incoming interface. label → inlet UNI-N node downstream outgoing interface. and label; Wherein, " → " expression mapping relations.When inlet UNI-N node receives the packet of inlet UNI-C node direction transmission through inlet UNI-N node upper reaches incoming interface; Can be according to said forward MPLS label forwarding item with the inlet UNI-N node upper reaches incoming interface node in the MPLS head. label is changed to inlet UNI-N node downstream outgoing interface. label, transmit packet through inlet UNI-N node downstream outgoing interface then.

The MPLS label of the inlet UNI-N node upper reaches incoming interface that inlet UNI-C node distributes the inlet UNI-N node that carries in the 3rd response message is as the MPLS label of inlet UNI-C node downstream outgoing interface, then sends to label that the packet of inlet UNI-N node the carries MPLS label for inlet UNI-C node downstream outgoing interface through said inlet UNI-C node downstream outgoing interface.

After setting up Ethernet virtual and connect through above flow process; Can transmit the EVPL business; Detailed process is following: the inlet UNI-C node inlet UNI-N node upper reaches incoming interface label that the UNI-N node returns that will enter the mouth is encapsulated in the MPLS head of the packet that will send; Send to inlet UNI-N node through the Ethernet virtual connection of having set up; Inlet UNI-N node receives packet through inlet UNI-N node upper reaches incoming interface, according to the forward MPLS label forwarding item of having set up, the MPLS label of the inlet UNI-N node upper reaches incoming interface in the MPLS head in the said packet is changed to the MPLS label of inlet UNI-N node downstream outgoing interface; And connect through the Ethernet virtual set up and to send to outlet UNI-N node; Outlet UNI-N node receives packet through outlet UNI-N node upper reaches incoming interface, according to the forward MPLS label forwarding item of having set up, the MPLS label of the outlet UNI-N node upper reaches incoming interface in the MPLS head in the said packet is changed to the MPLS label of outlet UNI-N node downstream outgoing interface; And send to outlet UNI-C node, thereby realize based on the EVPL of MPLS professional through outlet UNI-N node downstream outgoing interface.Owing to be that the Ethernet virtual of directly setting up through interacting message between the node connects, be configuration automatically between the node, do not need the pointwise manual configuration, therefore can improve Ethernet virtual establishment of connection efficient based on MPLS.

With reference to Fig. 3; Set up the method signaling process figure of EVC for the embodiment of the invention two; To realize that based on the RSVP (RSVP-TE, Resource ReSerVation Protocol-Traffic Engineering) of traffic engineering expansion Ethernet virtual establishment of connection process describes.RSVP-TE is used to the MPLS network and sets up label switched path as the complementary agreement of RSVP (RSVP, Resource ReSerVation Protocol).Connect in order to set up an exchange, the user uses path (Path) message to initiate to connect the request of foundation through uni interface.This request is arrived the purpose user through Network Transmission.If authentication has been passed through in this request, destination can use resource reservation (Resv) message to send a successfully indication to the source end subscriber.After inlet UNI-N node receives Path message; Can judge whether to exist existing Ethernet virtual link earlier; If there is existing Ethernet virtual link, then can connect, to improve the bandwidth resources utilance through existing Ethernet virtual link establishment Ethernet virtual.Concrete steps are following:

S301, inlet UNI-C node send Path message to inlet UNI-N node; Can comprise Ethernet sender flow specification (Ethernet SENDER_TSPEC in the Path message; Ethernet Sender Traffic Specification) object is used to represent that the connection that the sender creates is that Ethernet virtual connects; Can also carry the ethernet traffic engineering parameter in the said message, comprise universal tag request (Generalized Label Request) object in the Path message, LSP Encoding Type=Ethernet (2) wherein can be set; G-PID=Ethernet (33), Switching Type=EoMPLS L2SC (TBA);

The ethernet traffic engineering parameter mainly comprises: the grade of service, CIR, agreement burst rate and exceed burst rate etc.

In the present embodiment; Carry the information of the class of service (TSPEC) that the sender creates in the Path message; For example, carrying the connection that Ethernet SENDER_TSPEC object representes that the sender will create in the Path message is that Ethernet virtual connects, and if synchronous digital hierarchy (SDH; Synchronous Digital Hierarchy) business can be carried SONET/SDH SENDER_TSPEC object.

LSP Encoding Type representes the label switched path type of coding, and in practical implementation, can use value is 2 expression Ethernet.

G-PID is used to represent general payload sign (Generalized Payload Identifier), the client signal type that identification service carries, such as EPL and EVPL service bearer all be the Ethernet signal, can use G-PID=Ethernet.In practical implementation, can use value is 33 expression Ethernet.

Switching Type=EoMPLS L2SC (TBA) is used to represent that switch type is the Ethernet with MPLS carrying of data link layer bearing capacity; Data link layer is OSI (OSI; Open System Interconnect Reference Model) in the 2nd layer; Between physical layer and network layer, service is provided to network layer.The effect of data link layer is the reinforcement to the function of physical layer transmission original bit stream, and the physical connection that possibly make mistakes that physical layer is provided is transformed into the data link of zero defect in logic, promptly makes it network layer is shown as the link of a zero defect.The basic function of data link layer is to network layer transparent and reliable data delivery service to be provided.The concrete value of TBA (To Be Assigned) expression is treated the normal structure distribution.

After S302, inlet UNI-N node receive Path message; Judge whether to exist existing Ethernet virtual link; If exist; Then according to the ethernet traffic engineering parameter that carries in the Path message; Judge whether existing Ethernet virtual link has the resource that satisfies ethernet traffic engineering parameter entrained in the Path message between inlet UNI-N node and the outlet UNI-N node,, then select Ethernet virtual link that certain bar satisfies said ethernet traffic engineering parameter to jump out interface as next of signaling if the resource that satisfies said ethernet traffic engineering parameter is arranged; If do not satisfy the resource of said ethernet traffic engineering parameter, then can increase the bandwidth that has the Ethernet virtual link and satisfy said EVPL business through the existing signaling mechanism of ASON; If there is not existing Ethernet virtual link, perhaps existing Ethernet virtual link can't be adjusted bandwidth, can be through the Ethernet virtual link between newly-built inlet UNI-N node of the existing signaling mechanism of ASON and the outlet UNI-N node;

In ASON; Pass through User Network Interface (UNI by client device; User Network Interface) connection of initiating and creating is called exchange and connects (SC, Switched Connection), and SC mechanism makes ASON can realize bandwidth on-demand (BoD; Bandwidth on Demand) function satisfies the more and more demand of mobilism of Network.

Through judging whether existing Ethernet virtual link has the resource that satisfies the ethernet traffic engineering parameter between inlet UNI-N node and the outlet UNI-N node; And when the resource that satisfies the ethernet traffic engineering parameter is arranged; Select Ethernet virtual link that certain bar satisfies the traffic engineering parameter to jump out interface as next of signaling; Can shared resource, improve the utilance of link circuit resource.And when not satisfying the resource of flow parameter; Increase the bandwidth of existing Ethernet virtual link through the existing signaling mechanism of ASON; Perhaps when not having existing Ethernet virtual link, rebulid a new Ethernet virtual link; This shared existing Ethernet virtual link and increase have virtual link bandwidth or set up the method for a new Ethernet virtual link, can satisfy the business demand of various dynamic bandwidth applications and adjustment.

S303, inlet UNI-N node send Path message to outlet UNI-N node; Carry Ethernet SENDER_TSPEC object in the Path message and be used to represent that the connection that the sender creates is that Ethernet virtual connects; Also carry the ethernet traffic engineering parameter in the said message; LSP Encoding Type=Ethernet (2) in the Generalized Label Request object that setting is carried, G-PID=Ethernet (33), Switching Type=EoMPLS L2SC (TBA);

Said Ethernet SENDER_TSPEC object and Generalized Label Request object, and set parameter and the implication among the S301 is identical in the object, repeats no more.

S304, outlet UNI-N node send Path message to outlet UNI-C node, identical among the Ethernet SENDER_TSPEC object that carries in the Path message and Generalized Label Request object and S301 and the S303;

S305, outlet UNI-C node are according to the Path message from outlet UNI-N node; The MPLS label that distributes outlet UNI-C node upper reaches incoming interface; And returning Resv message to outlet UNI-N node, the universal tag in the Resv message (Generalized Label) object carries the MPLS label of the outlet UNI-C node upper reaches incoming interface that outlet UNI-C node distributes;

S306, outlet UNI-N node are received the Resv message that outlet UNI-C node returns; The MPLS label that distributes outlet UNI-N node upper reaches incoming interface; And the MPLS label of the outlet UNI-C node upper reaches incoming interface that distributes of the outlet UNI-C node in the Generalized Label object in the Resv message of returning according to outlet UNI-C node; And the outlet UNI-N node upper reaches incoming interface label of outlet UNI-N node distribution; After setting up forward MPLS label forwarding item and set up successfully on the data forwarding plane; Outlet UNI-N node returns Resv message to inlet UNI-N node, and the Generalized Label object in the message carries the MPLS label of the outlet UNI-N node upper reaches incoming interface of outlet UNI-N node distribution;

Because the label value in the Resv message that outlet UNI-N node is received in the entrained Generalized Label object is the MPLS label value of outlet UNI-C node upper reaches incoming interface; Be expressed as: upper reaches incoming interface. label; With its MPLS label as outlet UNI-N node downstream outgoing interface; Be expressed as: the downstream outgoing interface. label; And the MPLS label of distribution outlet UNI-N node upper reaches incoming interface; Be expressed as outlet UNI-N node upper reaches incoming interface. label, therefore can set up forward MPLS label forwarding item: outlet UNI-N node upper reaches incoming interface on the data forwarding plane. label → outlet UNI-N node downstream outgoing interface. label, wherein: " → " expression will export UNI-N node upper reaches incoming interface label and be mapped as outlet UNI-N node downstream outgoing interface label.After setting up forward MPLS label forwarding item; Outlet UNI-N node is received behind the next packet of outlet UNI-N node upper reaches incoming interface; After can changing the MPLS label according to the forward MPLS label forwarding item of having set up, from the UNI-N node downstream outgoing interface of correspondence, send.

S307, inlet UNI-N node are received the Resv message that outlet UNI-N node returns; The MPLS label that distributes inlet UNI-N node upper reaches incoming interface; And the label value of the Generalized Label object in the Resv message of returning according to outlet UNI-N node, set up forward MPLS label forwarding item on the data forwarding plane.After setting up successfully, inlet UNI-N node returns Resv message to inlet UNI-C node, and the Generalized Label object in the Resv message carries the MPLS label of the inlet UNI-N node upper reaches incoming interface of inlet UNI-N node distribution.

Equally; Inlet UNI-N node will export the MPLS label of the MPLS label of the outlet UNI-N node upper reaches incoming interface that the UNI-N node distributes as the UNI-N node downstream outgoing interface that enters the mouth; And distribute the MPLS label of this node upper reaches incoming interface; Thereby can set up forward MPLS label forwarding item on the data forwarding plane; Can be expressed as: inlet UNI-N node upper reaches incoming interface. label → inlet UNI-N node downstream outgoing interface. label, " → " expression UNI-N node upper reaches incoming interface label that will enter the mouth is mapped as the UNI-N node downstream outgoing interface label that enters the mouth.

After inlet UNI-N node receives Path message, also can not judge whether to exist existing Ethernet virtual link, directly set up a new Ethernet virtual link, repeat no more.

After setting up Ethernet virtual and connect through above flow process; Can transmit based on the EVPL of MPLS professional; Business data packet is transferred to outlet UNI-C node from inlet UNI-C node, owing to be the connection of directly setting up through interacting message between the node, is configuration automatically between the node; Do not need the pointwise manual configuration, therefore can improve Ethernet virtual establishment of connection efficient based on MPLS.

With reference to Fig. 4,, be that it is two-way connection that the Ethernet virtual that present embodiment is set up connects for the embodiment of the invention three provides EVPL professional method signaling process figure with a last embodiment difference, to support two-way services, idiographic flow is following:

S401, inlet UNI-C node send Path message to inlet UNI-N node; Comprise Ethernet SENDER_TSPEC object in the Path message and be used to represent that the connection that the sender creates is that Ethernet virtual connects; Also carry the ethernet traffic engineering parameter in the said message; Also comprise Generalized Label Request object in the Path message; LSP Encoding Type=Ethernet (2) wherein can be set, G-PID=Ethernet (33), Switching Type=EoMPLS L2SC (TBA); And in upper tag (Upstream Label) object, carry the MPLS label of the downstream incoming interface of inlet UNI-C node distribution, to set up two-way connection;

In the present embodiment in set Ethernet SENDER_TSPEC object and Generalized Label Request object and the object implication of concrete parameter identical with embodiment two; The setting of concrete parameter also can be adopted same set-up mode, no longer details.

Upstream Label object is used to represent that the connection of required foundation is two-way connection; Carry in the Path message that adjacent downstream node sends at upstream node, what Upstream Label object carried is the MPLS label that upstream node distributes at this upstream node downstream incoming interface.After downstream node is received the Path message of upstream node transmission,, think that then the connection of being asked is two-way if find that Upstream Label object is arranged.

Optional, can carry the MPLS label of the inlet UNI-C node downstream outgoing interface of inlet UNI-C node appointment through advising label (Suggested Label) or tally set (Label Set) object.In the common flow process of setting up unidirectional connection; The MPLS label that distributes this downstream node upper reaches incoming interface by downstream node; In order to make the adjacent upstream node of this downstream node that control arranged, can use Suggested Label or Label Set object to carry the MPLS label of this upstream node downstream outgoing interface of upstream node appointment.No matter be the label that distributes this upstream node downstream outgoing interface by upstream node; Still the label that distributes this downstream node upper reaches incoming interface by downstream node, purpose all be for the label of the downstream outgoing interface that makes upstream node identical with the label of the upper reaches incoming interface of downstream node.

After S402, inlet UNI-N node receive Path message; Judge whether to exist existing Ethernet virtual link; If exist; Then according to the ethernet traffic engineering parameter that carries in the Path message; Whether judgement existing Ethernet virtual link between inlet UNI-N node and outlet UNI-N node has the resource that satisfies ethernet traffic engineering parameter entrained in the Path message, if the resource that satisfies said ethernet traffic engineering parameter is arranged, then selects Ethernet virtual link that certain bar satisfies said ethernet traffic engineering parameter to jump out interface as next of signaling; If existing Ethernet virtual link does not satisfy the resource of said ethernet traffic engineering parameter, then can increase the bandwidth that has the Ethernet virtual link and satisfy new EVPL business through the existing signaling mechanism of ASON; If do not exist existing Ethernet virtual link or existing Ethernet virtual link can't adjust bandwidth, then can be through the Ethernet virtual link between newly-built inlet UNI-N node of the existing signaling mechanism of ASON and the outlet UNI-N node.

S403, inlet UNI-N node send Path message to outlet UNI-N node; Message is carried Ethernet SENDER_TSPEC object and is used to represent that the connection that the sender creates is that Ethernet virtual connects; Also carry the ethernet traffic engineering parameter in the said message; LSP Encoding Type=Ethernet (2) in the Generalized Label Request object that setting is carried, G-PID=Ethernet (33), Switching Type=EoMPLS L2SC (TBA).And,, in Upstream Label object, carry the MPLS label of the inlet UNI-N node downstream incoming interface of inlet UNI-N node distribution for setting up two-way connection.

When needs are set up two-way connection; Inlet UNI-N node can also obtain the MPLS label of the inlet UNI-C node downstream incoming interface of inlet UNI-C node distribution from Upstream Label; With the MPLS label of this label as inlet UNI-N node upper reaches outgoing interface; Be expressed as: inlet UNI-N node upper reaches outgoing interface. label; Inlet UNI-N node can distribute the label of inlet UNI-N node downstream incoming interface, that is: inlet UNI-N node downstream incoming interface. label, thus can set up reverse MPLS label forwarding item on the data forwarding plane; Can be expressed as: inlet UNI-N node downstream incoming interface. label → inlet UNI-N node upper reaches outgoing interface. label, " → " expression mapping relations.It is understandable that above-mentioned mapping relations also can adopt the mode of mapping table to realize.

Optional, carry the MPLS label of the inlet UNI-N node downstream outgoing interface of inlet UNI-N node appointment through Suggested Label or Label Set object.

S404, outlet UNI-N node send Path message to outlet UNI-C node; Identical among the Ethernet SENDER_TSPEC object that carries in the message and Generalized Label Request object and step S401 and the S403; And, carry the MPLS label of the outlet UNI-N node downstream incoming interface of outlet UNI-N node distribution in the Upstream Label object for setting up two-way connection.

When needs are set up two-way connection; Outlet UNI-N node obtains the MPLS label of the inlet UNI-N node downstream incoming interface of inlet UNI-N node distribution from Upstream Label; With the MPLS label of this label as outlet UNI-N node upper reaches outgoing interface; Be expressed as: outlet UNI-N node upper reaches outgoing interface. label; Outlet UNI-N node distributes the MPLS label of outlet UNI-N node downstream incoming interface, is expressed as: outlet UNI-N node downstream incoming interface. label, thus can set up reverse MPLS label forwarding item on the data forwarding plane; Be expressed as: outlet UNI-N node downstream incoming interface. label → outlet UNI-N node upper reaches outgoing interface. label, " → " expression will export UNI-N node downstream incoming interface label and be mapped as outlet UNI-N node upper reaches outgoing interface label.

Optional, carry the MPLS label of the outlet UNI-N node downstream outgoing interface of outlet UNI-N node appointment through Suggested Label or Label Set object.

S405, outlet UNI-C node are according to the Path message from outlet UNI-N node; The MPLS label that distributes outlet UNI-C node upper reaches incoming interface; And return Resv message to outlet UNI-N node; Generalized Label object in the Resv message carries the MPLS label of the outlet UNI-C node upper reaches incoming interface that outlet UNI-C node distributes, and the Suggested Label that carries in the Path message of label value and the transmission of its upstream node outlet UNI-N node or the label value of Label Set object are identical.

Outlet UNI-C node is received and is comprised Suggested Label or Label Set object in the Path message; Said object carries the MPLS label of the outlet UNI-N node downstream outgoing interface of outlet UNI-N node appointment; Therefore, the MPLS label value of said outlet UNI-N node downstream outgoing interface is copied in the Generalized Label object of the Resv message that outlet UNI-C node returns to make the MPLS label of outlet UNI-C node upper reaches incoming interface identical with the label that exports UNI-N node downstream outgoing interface.

In the common flow process of setting up unidirectional connection; The label of present node upper reaches incoming interface is distributed by downstream node; In order to make upstream node that control arranged, can use Suggested Label or Label Set object to realize that upstream node distributes the label of this upstream node downstream outgoing interface.

After S406, outlet UNI-N node receive the Resv message that outlet UNI-C node returns; The MPLS label that distributes outlet UNI-N node upper reaches incoming interface; And according to the label value of the Generalized Label object in the Resv message; Set up forward MPLS label forwarding item on the data forwarding plane: outlet UNI-N node upper reaches incoming interface. label → outlet UNI-N node downstream outgoing interface. label, " → " expression will export UNI-N node upper reaches incoming interface label and be mapped as outlet UNI-N node downstream outgoing interface label.After setting up successfully; Outlet UNI-N node returns Resv message to inlet UNI-N node; Generalized Label object in the Resv message carries the MPLS label of the outlet UNI-N node upper reaches incoming interface that outlet UNI-N node distributes, and the label value of Suggested Label that carries in the Path message of label value and the transmission of its upstream node inlet UNI-N node or Label Set object is identical.

After S407, inlet UNI-N node are received the Resv message that downstream node outlet UNI-N node returns; The MPLS label that distributes inlet UNI-N node upper reaches incoming interface; And according to the label value of the Generalized Label object in the Resv message; Set up forward MPLS label forwarding item on the data forwarding plane: inlet UNI-N upper reaches incoming interface. label → inlet UNI-N downstream outgoing interface. label, " → " expression UNI-N node upper reaches incoming interface label that will enter the mouth is mapped as the UNI-N node downstream outgoing interface label that enters the mouth.After setting up successfully; Inlet UNI-N node returns Resv message to inlet UNI-C node; Generalized Label object in the Resv message carries the MPLS label of the inlet UNI-N node upper reaches incoming interface that inlet UNI-N node distributes, and the label value of Suggested Label that carries in the Path message of label value and the transmission of its upstream node inlet UNI-C node or Label Set object is identical.

Can set up inlet UNI-C node and two-way connection that exports between the UNI-C node through above-mentioned flow process, and then it is professional in above-mentioned connection, to move two-way EVPL.

More than through specific embodiment the method for setting up EVC and connecting has been carried out detailed description, with reference to the accompanying drawings the pairing node device of this said method is carried out correspondence description:

With reference to Fig. 5, be one structural representation of node device in the embodiment of the invention, node device 500 comprises: first transmitting element 501, first receiving element 502, wherein:

First transmitting element 501 is used for sending a request message to downstream node, and carrying parameter in the described request message is that Ethernet virtual connects in order to the connection of representing request, and the label of being asked is the MPLS label;

First receiving element 502 is used to receive the described request message corresponding response message that downstream node returns, and carries the MPLS label of this downstream node upper reaches incoming interface of downstream node distribution in the said response message.

Said node device specifically can be an inlet UNI-C node device; Be used for initiating to set up an Ethernet virtual connection requests; Set up an Ethernet virtual connection through sending message request to downstream node; Carrying parameter in the described request message is that Ethernet virtual connects in order to the connection of representing request; And the label of being asked is the MPLS label, and the response message of the MPLS label that carries the said downstream node upper reaches incoming interface that downstream node distributes that receives that downstream node returns, and sets up an Ethernet virtual and is connected thereby cooperate with other nodes.Adopting node device one to set up the Ethernet virtual connection does not need the pointwise manual configuration, only needs just can set up automatically through interacting message between each node, therefore can improve the Ethernet virtual establishment of connection efficient based on MPLS.

With reference to Fig. 6; Be two structural representations of node device in the embodiment of the invention; Node device 600 comprises: second receiving element 601, second transmitting element 602, the 3rd receiving element 603, the first label distribution unit 604, forward MPLS label forwarding item are set up unit 605 and the 3rd transmitting element 606, wherein:

Second receiving element 601 is used to receive first request message that upstream node sends, and the connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

Second transmitting element 602; Be used for sending second request message to downstream node according to the parameter that said first request message carries; The connection that carries the parametric representation request in said second request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

The 3rd receiving element 603 is used to receive pairing first response message of said second request message that downstream node sends, and carries the MPLS label of the upper reaches incoming interface of the said downstream node that said downstream node distributes in said first response message;

The first label distribution unit 604, first response message that is used for receiving according to the 3rd receiving element distributes the MPLS label of this node device upper reaches incoming interface;

Forward MPLS label forwarding item is set up unit 605, and the MPLS label that the MPLS label that first response message that is used for receiving according to the 3rd receiving element 603 is entrained and the first label distribution unit 604 are distributed is set up forward MPLS label forwarding item;

The 3rd transmitting element 606 is used for upstream nodes and sends pairing second response message of said first request message, carries the said first label distribution unit institute distributed labels in said second response message.

This node device specifically can be an outlet UNI-N node device.

Also can expand above-mentioned node device; With reference to Fig. 7; Be three structural representations of node device in the embodiment of the invention; Be that with the difference of node device two this node device also can be expanded Ethernet virtual link establishment unit 701 on node device two bases; And also carry the ethernet traffic engineering parameter in first request message that said second receiving element 601 receives, said Ethernet virtual link establishment unit 701 is used for setting up the Ethernet virtual link according to the ethernet traffic engineering parameter of said first request message;

Said second transmitting element 602 is used for sending said second request message through said Ethernet virtual link.

This node device specifically can be an inlet UNI-N node device.

Also can do further expansion to inlet UNI-N node device; With reference to Fig. 8; Be four structural representations of node device in the embodiment of the invention; This node device further expands first judging unit 801, second judging unit 802 and selected cell 803 on the basis of node device three illustrated embodiments, wherein:

First judging unit 801 is used for when second receiving element 601 receives the message that upstream node sends, judging whether to exist existing Ethernet virtual link, and when having existing Ethernet virtual link, triggers second judging unit 802; When not having existing Ethernet virtual link, trigger Ethernet virtual link establishment unit 701;

Second judging unit 802; Be used to judge whether existing Ethernet virtual link has the resource that satisfies said ethernet traffic engineering parameter; And when the resource that satisfies said ethernet traffic engineering parameter is arranged; Triggering selection unit 803 when not satisfying the resource of said ethernet traffic engineering parameter, triggers Ethernet virtual link establishment unit 701;

Selected cell 803 is used to the Ethernet virtual link of selecting one to satisfy said ethernet traffic engineering parameter;

Said second transmitting element 602 is used for sending said second request message through the Ethernet virtual link that said selected cell 803 is selected.

Whether this node device has the resource that satisfies the ethernet traffic engineering parameter that carries in the message that said second receiving element 602 receives through the Ethernet virtual link that judges whether to exist existing Ethernet virtual link and existence; And when existing; Select an already present Ethernet virtual link to send said second request message to downstream node, thereby can improve the utilance of bandwidth resources.

With reference to Fig. 9; Be five structural representations of node device in the embodiment of the invention; On node device four bases; Also can expand ethernet link resource adjustment unit 901, when being used for resource when said existing Ethernet virtual link and can't satisfying said ethernet traffic engineering parameter, increase the bandwidth of said existing Ethernet virtual link;

Said second transmitting element 603 is used for sending said second request message to downstream node through the Ethernet virtual link after the said increase bandwidth.

Through the bandwidth of adjustment Ethernet virtual link, said node device can satisfy the business demand of various dynamic bandwidth applications and adjustment.

On node device three to six bases, also can do further expansion, setting up two-way connection, and then support two-way EVPL professional.

With reference to Figure 10; Be six structural representations of node device in the embodiment of the invention; Describe on node device three bases, to expand; Also carry the MPLS label of the said upstream node downstream incoming interface of upstream node distribution in first request message that said second receiving element 602 receives, node device also comprises: unit 1002 is set up with reverse MPLS label forwarding item in the second label distribution unit 1001, wherein:

The second label distribution unit 1001 is used to distribute the MPLS label of this node device downstream incoming interface;

Reverse MPLS label forwarding item is set up unit 1002; The MPLS label that the MPLS label of the downstream incoming interface of the said upstream node that is used for receiving according to said second receiving element 601 and the second label distribution unit 1001 distribute is set up reverse MPLS label forwarding item;

Also carry the MPLS label that the said second label distribution unit 1001 distributes in the message that said second transmitting element 603 is sent.

With reference to Figure 11, be seven structural representations of node device in the embodiment of the invention, node device 1100 comprises: the 4th receiving element 1101, the 3rd label distribution unit 1102 and the 4th transmitting element 1103, wherein:

The 4th receiving element 1101 is used to receive the request message that upstream node sends, and the connection that carries parametric representation request foundation in the described request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

The 3rd label distribution unit 1102 is used for when receiving the message of upstream node transmission, distributing the MPLS label of this node upper reaches incoming interface according to the parameter in the message;

The 4th transmitting element 1103 is used for upstream nodes and returns described request message corresponding response message, carries the MPLS label that the 3rd label distribution unit 1102 is distributed in the said response message.

Said node device specifically can be an outlet UNI-C node device; Be used to receive the request message that upstream node sends; The connection that carries the parametric representation request in the described request message is that Ethernet virtual connects; And the label of being asked is the MPLS label, and distributes the MPLS label of this node upper reaches incoming interface according to said parameter, and upstream nodes is returned response message; Carry the MPLS label of this node upper reaches incoming interface that distributes to some extent in the response message that is returned, be connected thereby set up an Ethernet virtual with other nodes cooperations.Adopting the said equipment to set up the Ethernet virtual connection does not need the pointwise configuration, therefore can improve the Ethernet virtual establishment of connection efficient based on MPLS.

The embodiment of the invention also provides a kind of EVPL of realization professional network; With reference to Figure 12; For realizing the schematic network structure that EVPL is professional in the embodiment of the invention; This network comprises: inlet UNI-C node 1201, inlet UNI-N node 1202, outlet UNI-N node 1203 and outlet UNI-C node 1204, wherein:

Inlet UNI-C node 1201 is used for sending first request message to inlet UNI-N node 1202, and the connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label; Receive the 3rd response message that inlet UNI-N node 1202 returns, carry the MPLS label of inlet UNI-N node 1202 upper reaches incoming interfaces of inlet UNI-N node 1202 distribution in said the 3rd response message;

Inlet UNI-N node 1202; Be used to receive said first request message that said inlet UNI-C node 1201 sends; And according to the parameter of carrying in said first request message; Ethernet virtual chain road direction outlet UNI-N node 1203 through being set up between inlet UNI-N node 1202 and the outlet UNI-N node 1203 sends second request message, and the connection that carries the parametric representation request in said second request message is that Ethernet virtual connects, and the label of being asked is the MPLS label; Receive second response message that outlet UNI-N node 1203 returns; Carry the MPLS label of outlet UNI-N node 1203 upper reaches incoming interfaces of outlet UNI-N node 1203 distribution in said second response message; The MPLS label that distributes inlet UNI-N node upper reaches incoming interface according to said second response message; And distribute the MPLS label of inlet UNI-N node 1202 upper reaches incoming interfaces according to said second response message; And, set up forward MPLS label forwarding item on the data forwarding plane according to the MPLS label of said outlet UNI-N node 1203 upper reaches incoming interfaces and the MPLS label that exports outlet UNI-N node 1203 upper reaches incoming interfaces of UNI-N node 1203 distribution; Return the 3rd response message to inlet UNI-C node 1201, carry the MPLS label of inlet UNI-N node 1202 upper reaches incoming interfaces of inlet UNI-N node 1202 distribution in said the 3rd response message;

Outlet UNI-N node 1203; Be used for the parameter of carrying according to said second request message; Send the 3rd request message to outlet UNI-C node 1204, the connection that carries the parametric representation request in said the 3rd request message is that Ethernet virtual connects, and the label of being asked is the MPLS label; Receive first response message that outlet UNI-C node 1204 returns; Carry the MPLS label of outlet UNI-C node 1204 upper reaches incoming interfaces of outlet UNI-C node 1204 distribution in said first response message; The MPLS label that distributes outlet UNI-N node 1203 upper reaches incoming interfaces according to said first response message; And, set up forward MPLS label forwarding item on the data forwarding plane according to the MPLS label of said outlet UNI-C node 1204 upper reaches incoming interfaces and the MPLS label that exports outlet UNI-N node 1204 upper reaches incoming interfaces of UNI-N node 1203 distribution; Return second response message to inlet UNI-N node 1202, carry the MPLS label of outlet UNI-N node 1203 upper reaches incoming interfaces of outlet UNI-N node 1203 distribution in said second response message;

Outlet UNI-C node 1204; Be used to receive the 3rd request message that outlet UNI-N node 1203 sends; And according to the parameter in said the 3rd request message; Distribute the MPLS label that exports UNI-C node 1204 upper reaches incoming interfaces, and return first response message, carry the MPLS label of outlet UNI-C node 1204 upper reaches incoming interfaces of outlet UNI-C node 1204 distribution in said first response message to outlet UNI-N node 1203.

More than the method for setting up EVC, network and node device that the embodiment of the invention provided have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.

Claims

1. set up the method that Ethernet virtual connects for one kind, it is characterized in that, comprising:

2. the method for setting up the Ethernet virtual connection as claimed in claim 1; It is characterized in that the Ethernet virtual link of being set up between said inlet UNI-N node and the outlet UNI-N node is to set up after receiving first request message that said inlet UNI-C node sends; Perhaps,

The Ethernet virtual link of being set up between said inlet UNI-N node and the outlet UNI-N node has existed before first request message that receives the transmission of said inlet UNI-C node.

3. the method for setting up the Ethernet virtual connection as claimed in claim 2; It is characterized in that; Also carry the ethernet traffic engineering parameter in first request message that said inlet UNI-N node receives from inlet UNI-C node; The Ethernet virtual link of being set up between said inlet UNI-N node and the outlet UNI-N node saidly sends second request message through the Ethernet virtual chain road direction outlet UNI-N node of being set up between inlet UNI-N node and the outlet UNI-N node and comprises when before receiving said first request message from inlet UNI-C node, having existed:

Inlet UNI-N node judges whether existing Ethernet virtual link has the resource that satisfies the ethernet traffic engineering parameter in said first request message; If have, then select an Ethernet virtual chain road direction outlet UNI-N node that satisfies said ethernet traffic engineering parameter to send said second request message; If do not have; Then increase the bandwidth of existing Ethernet virtual link; Make it satisfy said ethernet traffic engineering parameter, select this Ethernet virtual chain road direction that satisfies said ethernet traffic engineering parameter outlet UNI-N node to send said second request message again.

4. the method for setting up the Ethernet virtual connection as claimed in claim 3; It is characterized in that; Also carry the MPLS label of parameter in order to the inlet UNI-C node downstream outgoing interface of expression inlet UNI-C node appointment in said first request message from inlet UNI-C node, the MPLS label of said inlet UNI-N node entrained inlet UNI-N node upper reaches incoming interface that is distributed by inlet UNI-N node in the 3rd response message that inlet UNI-C node returns is the MPLS label of the inlet UNI-C node downstream outgoing interface of said inlet UNI-C node appointment;

Said inlet UNI-N node also carries the MPLS label of parameter in order to the inlet UNI-N node downstream outgoing interface of expression inlet UNI-N node appointment in second request message that exports the transmission of UNI-N node, said outlet UNI-N node entrained MPLS label by the outlet UNI-N node upper reaches incoming interface that exports the distribution of UNI-N node in first response message that inlet UNI-N node returns is the MPLS label of the inlet UNI-N node downstream outgoing interface of said inlet UNI-N node appointment;

Said outlet UNI-N node also carries the MPLS label of parameter in order to the outlet UNI-N node downstream outgoing interface of expression outlet UNI-N node appointment in the 3rd request message that exports the transmission of UNI-C node, said outlet UNI-C node entrained MPLS label by the outlet UNI-C node upper reaches incoming interface that exports the distribution of UNI-C node in first response message that outlet UNI-N node returns is the MPLS label of the outlet UNI-N node downstream outgoing interface of said outlet UNI-N node appointment.

5. like each described method of setting up the Ethernet virtual connection of claim 1 to 4; It is characterized in that; When the Ethernet virtual of setting up is connected to two-way connection, also carry the MPLS label of the inlet UNI-C node downstream incoming interface of inlet UNI-C node distribution in said first request message from inlet UNI-C node; The MPLS label of the MPLS label of the inlet UNI-C node downstream incoming interface that said inlet UNI-N node distributes according to said inlet UNI-C node and the inlet UNI-N node downstream incoming interface that distributed by inlet UNI-N node is set up reverse MPLS label forwarding item on the data forwarding plane;

Said inlet UNI-N node also carries the MPLS label of the inlet UNI-N node downstream incoming interface of said inlet UNI-N node distribution in second request message that outlet UNI-N node sends; Said outlet UNI-N node is set up reverse MPLS label forwarding item according to the MPLS label of the inlet UNI-N node downstream incoming interface of said inlet UNI-N node distribution and the MPLS label that exports the outlet UNI-N node downstream incoming interface of UNI-N node distribution on the data forwarding plane;

Said outlet UNI-N node also carries the MPLS label of the downstream incoming interface of said outlet UNI-N node distribution in the 3rd request message that outlet UNI-C node sends.

6. a node device is characterized in that, comprising: second receiving element, second transmitting element, the 3rd receiving element, the first label distribution unit, forward MPLS label forwarding item are set up unit and the 3rd transmitting element, wherein:

Second receiving element is used to receive first request message that upstream node sends, and the connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

7. node device as claimed in claim 6 is characterized in that, said node device also comprises: first judging unit, second judging unit, Ethernet virtual link establishment unit and selected cell, wherein:

First judging unit is used to judge whether to exist existing Ethernet virtual link, and when having existing Ethernet virtual link, triggers second judging unit; When not having existing Ethernet virtual link, trigger Ethernet virtual link establishment unit;

Second judging unit; Be used to judge whether existing Ethernet virtual link has the resource that satisfies the ethernet traffic engineering parameter; And when the resource that satisfies said ethernet traffic engineering parameter is arranged; The triggering selection unit when not satisfying the resource of said ethernet traffic engineering parameter, triggers Ethernet virtual link establishment unit;

Ethernet virtual link establishment unit is used for setting up the Ethernet virtual link according to the ethernet traffic engineering parameter of said first request message;

Selected cell is used to the Ethernet virtual link of selecting one to satisfy said ethernet traffic engineering parameter;

Said second transmitting element, when said first judging unit triggered Ethernet virtual link establishment unit, the Ethernet virtual link of setting up through said Ethernet virtual link establishment unit sent said second request message; When said first judging unit triggered said second judging unit, the Ethernet virtual link of selecting through said selected cell sent said second request message.

8. like claim 6 or 7 described node devices; It is characterized in that; Also carry the MPLS label of the said upstream node downstream incoming interface of upstream node distribution in first request message that said second receiving element receives; Also comprise: the unit is set up with reverse MPLS label forwarding item in the second label distribution unit, wherein:

The second label distribution unit is used to distribute the MPLS label of this node device downstream incoming interface;

Reverse MPLS label forwarding item is set up the unit, and the MPLS label of the downstream incoming interface of the said upstream node that is used for receiving according to said second receiving element and the MPLS label that the second label distribution unit distributes are set up reverse MPLS label forwarding item;

Also carry the MPLS label that the said second label distribution unit distributes in the message that said second transmitting element is sent.

9. network of realizing Ethernet virtual private line service; It is characterized in that; Comprise inlet UNI-C node, inlet UNI-N node, outlet UNI-N node and outlet UNI-C node; Said inlet UNI-C node comprises first transmitting element and first receiving element; Said inlet UNI-N node comprises that second receiving element, second transmitting element, the 3rd receiving element, the first label distribution unit, forward MPLS label forwarding item set up unit, the 3rd transmitting element and Ethernet virtual link establishment unit; Said outlet UNI-N node comprises that second receiving element, second transmitting element, the 3rd receiving element, the first label distribution unit, forward MPLS label forwarding item set up unit and the 3rd transmitting element, and said outlet UNI-C node comprises the 4th receiving element, the 3rd label distribution unit and the 4th transmitting element;

Said first transmitting element is used for sending first request message to inlet UNI-N node, and the connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

Said first receiving element is used to receive the 3rd response message that inlet UNI-N node returns, and carries the MPLS label of the inlet UNI-N node upper reaches incoming interface of inlet UNI-N node distribution in said the 3rd response message;

Second receiving element of said inlet UNI-N node; Be used to receive first request message that said inlet UNI-C node sends; The connection that carries the parametric representation request in said first request message is the Ethernet virtual connection and carries the ethernet traffic engineering parameter, and the label of being asked is the MPLS label;

Said Ethernet virtual link establishment unit is used for setting up Ethernet virtual link between inlet UNI-N node and the outlet UNI-N node according to the ethernet traffic engineering parameter of said first request message;

Second transmitting element of said inlet UNI-N node; Be used for the parameter of carrying according to said first request message; Ethernet virtual chain road direction outlet UNI-N node through being set up between inlet UNI-N node and the outlet UNI-N node sends second request message; The connection that carries the parametric representation request in said second request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

The 3rd receiving element of said inlet UNI-N node is used to receive second response message that outlet UNI-N node returns, and carries the MPLS label of the outlet UNI-N node upper reaches incoming interface of outlet UNI-N node distribution in said second response message;

The first label distribution unit of said inlet UNI-N node is used for the MPLS label according to said second response message distribution inlet UNI-N node upper reaches incoming interface;

The forward MPLS label forwarding item of said inlet UNI-N node is set up the unit; Be used for setting up forward MPLS label forwarding item on the data forwarding plane according to the MPLS label of said inlet UNI-N node upper reaches incoming interface and the MPLS label that exports the outlet UNI-N node upper reaches incoming interface of UNI-N node distribution;

The 3rd transmitting element of said inlet UNI-N node is used for returning the 3rd response message to inlet UNI-C node, carries the MPLS label of the inlet UNI-N node upper reaches incoming interface of inlet UNI-N node distribution in said the 3rd response message;

Second receiving element of said outlet UNI-N node; Be used to receive first request message that said inlet UNI-N node sends; The connection that carries the parametric representation request in said first request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

Second transmitting element of said outlet UNI-N node; Be used for the parameter of carrying according to said second request message; Send the 3rd request message to outlet UNI-C node; The connection that carries the parametric representation request in said the 3rd request message is that Ethernet virtual connects, and the label of being asked is the MPLS label;

The 3rd receiving element of said outlet UNI-N node is used to receive first response message that outlet UNI-C node returns, and carries the MPLS label of the outlet UNI-C node upper reaches incoming interface of outlet UNI-C node distribution in said first response message;

The first label distribution unit of said outlet UNI-N node is used for distributing the MPLS label that exports UNI-N node upper reaches incoming interface according to said first response message;

The forward MPLS label forwarding item of said outlet UNI-N node is set up the unit; Be used for setting up forward MPLS label forwarding item on the data forwarding plane according to the MPLS label of said outlet UNI-C node upper reaches incoming interface and the MPLS label that exports the outlet UNI-N node upper reaches incoming interface of UNI-N node distribution;

The 3rd transmitting element of said outlet UNI-N node is used for returning second response message to inlet UNI-N node, carries the MPLS label of the outlet UNI-N node upper reaches incoming interface of outlet UNI-N node distribution in said second response message;

Said the 4th receiving element is used to receive the 3rd request message that second transmitting element of outlet UNI-N node sends;

Said the 3rd label distribution unit is used for the parameter according to said the 3rd request message, distributes the MPLS label of outlet UNI-C node upper reaches incoming interface;

Said the 4th transmitting element is used for returning first response message to outlet UNI-N node, carries the MPLS label of the outlet UNI-C node upper reaches incoming interface of the 3rd label distribution unit distribution that exports the UNI-C node in said first response message.