CN103795601A

CN103795601A - Method and device for realizing ring-network Steering protection

Info

Publication number: CN103795601A
Application number: CN201210434930.9A
Authority: CN
Inventors: 程伟强; 王磊; 李晗; 叶雯
Original assignee: China Mobile Communications Group Co Ltd
Current assignee: China Mobile Communications Group Co Ltd
Priority date: 2012-11-04
Filing date: 2012-11-04
Publication date: 2014-05-14
Anticipated expiration: 2032-11-04
Also published as: CN103795601B

Abstract

The embodiment of the application discloses a method for realizing ring-network Steering protection. The method includes: establishing work channels and protection channels, which are corresponding to different nodes of a ring network; and according to the state of links of the nodes of the ring network, switching to a transmission network service of the work channels or the protection channels so as to realize the ring-network Steering protection. The embodiment of the application also provides a device for realizing the ring-network Steering protection and a method and device for realizing the ring-network Steering protection on the basis of an LSP service. The scheme of the embodiment of the invention reduces the number of the work channels and the protection channels so that the configuration workload and configuration complexity of the nodes of the ring network are reduced and hardware demands on network ring node devices are reduced.

Description

A kind of method and device of realizing looped network Steering protection

Technical field

The application relates to communication network technology field, particularly relates to a kind of method and corresponding device thereof of realizing looped network Steering protection.

Background technology

Loop network (hereinafter to be referred as looped network) is a kind of network topology structure that communication technical field is conventional.With respect to other network topology structures, ring network structure can improve network survivability (Survivability largely, refer to that network equipment node is while breaking down, network can be in the self-healing of utmost point short time to maintain the ability of certain tolerable service level).Based on this specific character, looped network is widely used in setting up diverse network (such as optical-fiber network, microwave network, Packet Transport Network PTN etc.).Network via looped network transmission strengthens network survivability by service aisle and protection channel are set; looped network Steering protected mode is after discovering network device node fault; enter to encircle Nodes in Network service aisle is switched to protection channel; or; after network equipment node fault recovery, enter to encircle Nodes in Network protection channel is switched to service aisle.

Prior art has provided a kind of specific implementation of looped network Steering protection.Referring to Fig. 1, the figure shows take LSP business as illustrating the basic process of meaning looped network Steering protection.Which transmission LSP (Label Switching Path; label switched path) when business; set up independently service aisle and protection channel take LSP business as unit; LSP1 business in figure from the node A of looped network enter ring, node C goes out ring; the service aisle of LSP1 business is the A-B-C passage by path label W1-1 and W1-2 mark, and protection channel is the loop by path label P1-1～P1-4 mark.Referring to Fig. 1 (a), in the time that looped network node link A-B, the B-C of transmission LSP1 business is normal, LSP1 business arrives destination node C by service aisle from source node A; Referring to Fig. 1 (b), in the time that node link A-B and/or B-C break down, LSP1 business is switched to protection channel and realizes business transmission at node A place.

The planning of above-mentioned looped network Steering protection implementation is simple, can meet under normal circumstances switching time requirement.But; which is due to take Network as unit; independent structure service aisle and the protection channel corresponding with Network; in the time that Network quantity sharply increases; total number of channels (service aisle and protection channel) linear growth thereupon, thus configuration effort amount and configuration complexity to the each node of looped network strengthened, raised the hardware requirement of looped network node equipment.In addition,, because each passage needs separately independently path label mark, the increase of total number of channels also increases number of labels, has strengthened the management difficulty of path label.

Summary of the invention

For solving the problems of the technologies described above; the embodiment of the present application provides a kind of method and related device of realizing looped network Steering protection; to reduce the quantity of service aisle and protection channel, thereby reduce configuration effort amount and the configuration complexity of the each node of looped network and reduce the hardware requirement to looped network node equipment.

The method of looped network Steering protection that what the embodiment of the present application provided realize comprises:

Set up service aisle and the protection channel corresponding with each node of looped network;

Protect to realize looped network Steering according to service aisle described in the condition selecting of looped network node link or protection channel transport network traffic.

Preferably, described foundation service aisle and the protection channel corresponding with each node of looped network comprises:

The node being close to the node of service aisle to be set up and protection channel distributes ring channel labels;

Determine service aisle and the protection channel of the each node of looped network according to the ring channel labels receiving.

Further preferably, when in the time setting up node next-door neighbour's the upstream node distribution ring channel labels of service aisle and protection channel, determine service aisle and the protection channel of the updrift side of the each node of looped network according to the ring channel labels receiving; When in the time setting up node next-door neighbour's the downstream node distribution ring channel labels of service aisle and protection channel, determine service aisle and the protection channel of the downstream direction of the each node of looped network according to the ring channel labels receiving.

Further preferably, the described state variation according to looped network node link is switched to service aisle or protection channel transport network traffic comprises:

When being switched to after service aisle or protection channel according to the state variation of looped network node link; the first ring channel labels that link point receives that enters of Network is pushed to network service message; the first ring channel labels exchange that the second ring channel labels that the intermediate node of Network transmission is received and Network message are carried is peeled off the second ring channel labels to realize Network transmission at the Nodes that goes out to encircle of Network from Network message.

Further preferably, in the time that Network is LSP business, described service aisle or protection channel comprise ring channel logic layer, when selecting after service aisle or protection channel according to the state variation of looped network node link, by the ring channel logic layer that enters first ring channel labels that link point receives and push transmission LSP service message of LSP business, the second ring channel labels that the intermediate node of Network transmission is received is in ring channel logic layer and the exchange of first ring channel labels of transmission LSP service message, the Nodes that goes out to encircle in LSP business is peeled off the second ring channel labels to realize the transmission of LSP business from the ring channel logic layer of transmission LSP service message.

Preferably, the state of the each node link of looped network each node storage looped network, the described state variation according to looped network node link is switched to service aisle or protection channel transport network traffic comprises:

Judge the each node link state of looped network that enters the storage of link point of Network;

When the node link comprising when the transmission path of this Network is all the first preset state, select service aisle transport network traffic;

In the time having at least one to be the second preset state in the node link that the transmission path of this Network comprises, select protection channel transport network traffic.

Further preferably, described method also comprises:

The state variation of the each node link of monitoring looped network;

In the time having node link state to change, the state of this node link is changed towards the node link direction changing away from state and puts section by section notice to other nodes;

Change the each node link state of looped network that upgrades storage according to the state of described node link.

Further preferably, the state variation of the each node link of described monitoring looped network is specially by the state variation of detection of connectivity function monitoring looped network node link, and the described change of the state by node link is put section by section notice towards the node link direction changing away from state and is specially to other nodes: the node link direction state change court of node link being changed away from state by APS message is put notice section by section to other nodes.

The embodiment of the present application also provides a kind of method based on LSP business realizing looped network Steering protection.The method comprises:

Upstream node and/or downstream node to the each node next-door neighbour of looped network distribute ring channel labels, determine service aisle and the protection channel of the each node of looped network according to the ring channel labels receiving, and described service aisle and protection channel comprise ring channel logic layer;

The state of the each node link of storage looped network, and by the state variation of detection of connectivity function monitoring looped network node link, in the time having node link state to change, by APS message, the state of this node link is changed towards the node link direction changing away from state and puts section by section notice to other nodes, change the each node link state of looped network that upgrades storage according to the state of described node link;

Judge the each node link state of looped network that enters the storage of link point of LSP business; When the node link comprising when the transmission path of this LSP business is all normal condition, select service aisle transmission LSP business; In the time having at least one to be malfunction in the node link that the transmission path of this LSP business comprises, select protection channel transmission LSP business;

When being switched to after service aisle or protection channel according to the state variation of looped network node link; by the ring channel logic layer that enters first ring channel labels that link point receives and push transmission LSP service message of LSP business; the second ring channel labels that the intermediate node of Network transmission is received, in ring channel logic layer and the exchange of first ring channel labels of transmission LSP service message, is peeled off the second ring channel labels to realize the transmission of LSP business at the Nodes that goes out to encircle of LSP business from the ring channel logic layer of transmission LSP service message.

The embodiment of the present application also provides a kind of device of realizing looped network Steering protection.This device comprises: Path Setup unit and business transmission unit, wherein:

Described Path Setup unit, for setting up the service aisle corresponding with each node of looped network and protection channel;

Described business transmission unit, for being switched to described service aisle or protection channel transport network traffic to realize looped network Steering protection according to the state of looped network node link.

Preferably, described Path Setup unit comprises: label distribution subelement and passage are determined subelement, wherein:

Described label distribution subelement, distributes ring channel labels for the node of the node next-door neighbour to service aisle to be set up and protection channel;

Described passage is determined subelement, for determine service aisle and the protection channel of the each node of looped network according to the ring channel labels receiving.

Further preferably, in the time that described label distribution subelement encircles channel labels specifically for distributing to the upstream node being close to wait the node of setting up service aisle and protection channel, described passage determines that subelement is specifically for determining service aisle and the protection channel of the updrift side of the each node of looped network according to the ring channel labels receiving; In the time that described label distribution subelement encircles channel labels specifically for distributing to the downstream node being close to wait the node of setting up service aisle and protection channel, described passage determines that subelement is specifically for determining service aisle and the protection channel of the downstream direction of the each node of looped network according to the ring channel labels receiving.

Further preferably, described business transmission unit comprises: label pushes subelement, label commutator unit and label peeling subelement, wherein:

Described label pushes subelement, for when being switched to after service aisle or protection channel according to the state variation of looped network node link, the first ring channel labels that link point receives that enters of Network is pushed to network service message;

Described label commutator unit, the first ring channel labels exchange that the second ring channel labels receiving for the intermediate node that Network is transmitted and Network message are carried;

Described label peeling subelement, peels off the second ring channel labels to realize Network transmission for the Nodes that goes out to encircle in Network from Network message.

Further preferably, in the time that Network is LSP business, described service aisle or protection channel comprise ring channel logic layer,

Described label pushes subelement specifically for when being switched to after service aisle or protection channel according to the state variation of looped network node link, by the ring channel logic layer that enters first ring channel labels that link point receives and push transmission LSP service message of LSP business;

Described label commutator unit exchanges in ring channel logic layer and the first ring channel labels of transmission LSP service message specifically for the second ring channel labels that the intermediate node of Network transmission is received,

Described label peeling subelement, peels off the second ring channel labels to realize the transmission of LSP business for the Nodes that goes out to encircle in LSP business from the ring channel logic layer of transmission LSP service message.

Preferably, described device also comprises state storage unit, and for storing the state of the each node link of looped network, described business transmission unit comprises: state judgment sub-unit, first passage chooser unit and second channel chooser unit, wherein:

Described state judgment sub-unit, for judging the each node link state of looped network that enters the storage of link point of Network;

Described first passage chooser unit, while being all the first preset state, selects service aisle transport network traffic for the node link comprising at the transmission path of this Network;

Described second channel chooser unit, while having at least one to be the second preset state, selects protection channel transport network traffic for the node link comprising at the transmission path of this Network.

Further preferably, described device also comprises state variation monitoring means, status change notification unit and state updating unit, wherein:

Described state transformation monitoring means, for monitoring the state variation of the each node link of looped network;

Described status change notification unit, in the time having node link state to change, changes the state of this node link towards the node link direction changing away from state and puts section by section notice to other nodes;

Described state updating unit, for changing the each node link state of looped network that upgrades cell stores according to the state of described node link.

Further preferably, described state variation monitoring means is specifically for passing through the state variation of detection of connectivity function monitoring looped network node link, and described status change notification unit arrives other nodes specifically for the state of node link being changed to put section by section to notify towards the node link direction changing away from state by APS message.

The embodiment of the present application also provides a kind of device based on LSP business realizing looped network Steering protection.This device comprises: service aisle protection channel is set up unit, node link state-maintenance unit, service aisle protection channel switch unit and LSP business transmission unit, wherein:

Described service aisle protection channel is set up unit, distribute ring channel labels for the upstream node to the each node next-door neighbour of looped network and/or downstream node, determine service aisle and the protection channel of the each node of looped network according to the ring channel labels receiving, described service aisle and protection channel comprise ring channel logic layer;

Described node link state-maintenance unit, for storing the state of the each node link of looped network, and by the state variation of detection of connectivity function monitoring looped network node link, in the time having node link state to change, by APS message, the state of this node link is changed towards the node link direction changing away from state and puts section by section notice to other nodes, change the each node link state of looped network that upgrades storage according to the state of described node link;

Described service aisle protection channel switch unit, for judging the each node link state of looped network that enters the storage of link point of LSP business; When the node link comprising when the transmission path of this LSP business is all normal condition, select service aisle transmission LSP business in the time having at least one to be malfunction in the node link that the transmission path of this LSP business comprises, select protection channel transmission LSP business;

Described LSP business transmission unit; be used for when being switched to after service aisle or protection channel according to the state variation of looped network node link; by the ring channel logic layer that enters first ring channel labels that link point receives and push transmission LSP service message of LSP business; the second ring channel labels that the intermediate node of Network transmission is received, in ring channel logic layer and the exchange of first ring channel labels of transmission LSP service message, is peeled off the second ring channel labels to realize the transmission of LSP business at the Nodes that goes out to encircle of LSP business from the ring channel logic layer of transmission LSP service message.

The embodiment of the present application is being set up after the service aisle and protection channel corresponding with each node of looped network, protects to realize looped network Steering according to service aisle described in the condition selecting of looped network node link or protection channel transport network traffic.Compared with prior art; because service aisle and the protection channel of the embodiment of the present application are corresponding and no longer interrelated with Network with the node of looped network; total number of channels depends on the number of nodes that looped network comprises; can share from multiple Networks of same node point discrepancy ring service aisle and the protection channel that this node is corresponding; in the Network situation of transmission equal number; reduce generally the quantity of service aisle and protection channel, reduced configuration effort amount and the configuration complexity of the each node of looped network and reduced the hardware requirement to looped network node equipment.In addition,, because total number of channels reduces, for identifying the also minimizing thereupon of number of labels of passage, thereby reduced the management difficulty of path label.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, the accompanying drawing the following describes is only some embodiment that record in the application, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 (a) is prior art realizes looped network Steering protection under normal circumstances process schematic diagram at the whole nodes of looped network;

Fig. 1 (b) is the process schematic diagram that prior art realizes looped network Steering protection under looped network node has failure condition; The flow chart of an embodiment of the method that comprises many video-frequency bands;

Fig. 2 is the application's embodiment of the method one flow chart of realizing looped network Steering protection;

What Fig. 3 (a) was the application realizes embodiment of the method two flow charts that looped network Steering protects;

Fig. 3 (b) is that the ring channel labels of embodiment bis-is distributed and Network transmitting procedure schematic diagram;

The label layer structural representation that Fig. 4 (a) adopts for transmitting LSP business in prior art;

The label layer structural representation that Fig. 4 (b) adopts for the embodiment of the present application transmission LSP business;

Fig. 5 (a) is the looped network node processing schematic diagram of LSP business under normal circumstances of the application's the embodiment of the method three that realizes looped network Steering protection;

Fig. 5 (b) is embodiment tri-looped network nodes LSP business transmission schematic diagrames under a kind of failure situations;

Fig. 5 (c) is embodiment tri-looped network nodes LSP business transmission schematic diagrames under another kind of failure situations;

Fig. 6 is the structured flowchart of the application's the device embodiment tetra-that realizes looped network Steering protection.

Embodiment

In order to make those skilled in the art person understand better the technical scheme in the application, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only the application's part embodiment, rather than whole embodiment.Based on the embodiment in the application, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all should belong to the scope of the application's protection.

Embodiment mono-

Referring to Fig. 2, the figure shows the flow process of the application's the embodiment of the method one that realizes looped network Steering protection.This embodiment comprises:

Step S201: set up service aisle and the protection channel corresponding with each node of looped network;

Looped network comprises the node of multiple formation looped networks, and these nodes can a corresponding concrete network equipment, a virtual network structure elements that also can be corresponding.According to the difference playing a role in transport network traffic process, the node on looped network can be divided into three classes: a class be access network business enter link point, a class is the adapter ring node of transport network traffic, the 3rd class be output network business go out link point.This three category node is brought into play separately the effect of self in transmission single network business procedure, and still, with regard to looped network generally speaking, any one node on looped network all may have the function of three category nodes simultaneously.Therefore, setting up in service aisle and protection channel process, towards be each node in looped network.

Set up service aisle and the protection channel corresponding with each node of looped network and can there is multiple implementation, such as can be take the node of service aisle to be set up and protection channel as source node, using with this source node other nodes in same ring as destination node, set up successively two passages between node, thereby form service aisle and protection channel; Can also be take the node of service aisle to be set up and protection channel as destination node, other nodes are source node, set up service aisle and protection channel.In a ring; the service aisle of each node and protection channel can be shared in overlapping part; also can not share; the former can reduce the quantity of service aisle and protection channel as much as possible; although the latter can increase with respect to the quantity of the former service aisle and protection channel; but because the node total quantity in ring is limited, this total number of channels will can infinitely not increase.It should be noted that: as previously mentioned, looped network is the network of setting up with ring topology, in a looped network, may comprise countless multiple mutual cover chains or independently " ring ", the present embodiment for simplicity, only using one " ring " in looped network as description object, and use without distinction the concept of ring and looped network.

Step S202: be switched to described service aisle or protection channel transport network traffic to realize looped network Steering protection according to the state of looped network node link;

The service aisle of looped network node and protection channel form pair of channels group; Network can select a passage to carry out business transmission to realize looped network Steering protection under a kind of state of looped network node link; after this state changes, can switch to another passage and carry out business transmission to realize looped network Steering protection.Such as certain node link in the transmission path of Network process waiting for transmission breaks down; the state of looped network node link is changed; originally can will be switched to protection channel by the Network of the definite service aisle transmission of this transmission path transmits; and the fault restoration of the node link that ought break down; the state of looped network node link changes again, and the Network of transmitting by protection channel may be switched back service aisle and be transmitted.

It should be noted that in this step: the state of the looped network node link here can refer to the state of individual node link, also can after each node link status merging in encircling is a state group, refer to the state variation of this group.Such as; a ring comprises 4 node A, B, C, D; there is 4 node link A-B, B-C, C-D, D-A; when the C-D link in these 4 node links breaks down; if the Network of transmission comprises this node link, will be switched to protection channel transport network traffic to realize Steering protection by service aisle so.In addition; because C-D Link State in 4 node links changes, the state of other 3 node links does not change; the state of the state group being made up of 4 node link states will change; if the Network of transmission comprises this node link, also will be switched to protection channel transport network traffic to realize Steering protection by service aisle.

The present embodiment is being set up after the service aisle and protection channel corresponding with each node of looped network, is switched to service aisle or protection channel transport network traffic is protected to realize looped network Steering according to the state of looped network node link.Compared with prior art, the embodiment of the present application at least can obtain following technique effect:

(1) because service aisle and the protection channel of the present embodiment are corresponding and no longer interrelated with Network with the node of looped network; depart from the constraint of Network; make total number of channels depend on the number of nodes that looped network comprises; in the Network situation of transmission equal number; reduce generally the quantity of service aisle and protection channel; the configuration effort amount and the configuration complexity that have reduced the each node of looped network, also reduced the hardware requirement to looped network node equipment.

(2) because the node of the present embodiment based in ring set up service aisle and protection channel; between each node, the service aisle of lap and protection channel can adopt shared mechanism; make the multiple Networks that enter ring (going out ring) from identical sources node (destination node) use same section of service aisle and protection channel, thereby further compressed the quantity of service aisle and protection channel.

(3) because the total number of channels of the present embodiment reduces with respect to prior art; in addition the present embodiment is set up service aisle and protection channel based on ring interior nodes; channel section between each node can be shared; the path label quantity that is used in mark service aisle and protection channel reduces thereupon, thereby has reduced the management difficulty of path label.

(4) because the service aisle of the present embodiment and the quantity of protection channel reduce with respect to prior art; in the time going out present condition change; the number of times switching between different operating passage and protection channel will reduce generally, thereby be conducive to improve the efficiency of switching in looped network Steering protection process.

Embodiment bis-

Previous embodiment is mentioned service aisle and the protection channel that can adopt various ways to set up the each node of looped network; in actual application; the application preferably adopts label scheme to realize this object; and on employing label scheme basis, on looped network, carry out Network transmission to realize looped network Steering protection, form thus the application's embodiment bis-.Referring to Fig. 3, wherein: Fig. 3 (a) shows the flow process of the present embodiment; Fig. 3 (b) shows the ring channel labels of the present embodiment and distributes and Network transmitting procedure.The present embodiment comprises:

Step S301: the node being close to the node of service aisle to be set up and protection channel distributes ring channel labels;

Step S302: service aisle and the protection channel of determining the each node of looped network according to the ring channel labels receiving;

Be depicted as example with Fig. 3 (b), looped network comprises A, B, C, D, E, F6 node, need to set up now service aisle and the protection channel of node D, here the destination node that goes out ring using D node as Network describes, D node distributes ring channel labels to its next-door neighbour's node C, C node is set up the service aisle section RC1 between CD after receiving this ring channel labels, the like, C node is again to its next-door neighbour's Node B initial ring channel labels, request is established to the service aisle of D node, B node is set up the service aisle section RC2 between BC after receiving this ring channel labels, go down like this, can set up by E to F until the service aisle of D.Can set up protection channel according to setting up the similar mode of service aisle.It should be noted that: be the clockwise logic working passage of setting up take D as destination node here, in practical application, also can set up take D as destination node counterclockwise service aisle, or the service aisle of both direction all set up.When in the time setting up node next-door neighbour's the upstream node distribution ring channel labels of service aisle and protection channel, determine service aisle and the protection channel of the updrift side of the each node of looped network according to the ring channel labels receiving; When in the time setting up node next-door neighbour's the downstream node distribution ring channel labels of service aisle and protection channel, determine service aisle and the protection channel of the downstream direction of the each node of looped network according to the ring channel labels receiving.Here " upstream " is relative concept with " downstream ", and take a direction as " upstream ", it is " downstream " in the other direction.If upstream and downstream direction is all set up service aisle and protection channel, a node can be set up at most 4 passages corresponding with it.

Step S303: switch to service aisle or protection channel according to the state variation of looped network node link;

Step S304: the first ring channel labels that link point receives that enters of Network is pushed to network service message;

When according to the state variation of looped network node link, by a channel switching during to another passage, Network will enter link point by the channel transfer business of switching from looped network, its concrete transmitting procedure shows as first ring channel labels PUSH (pushing) the Network message receiving entering to encircle Nodes, makes this networking service message carry this first ring channel labels.

Step S305: the first label exchange that the second ring channel labels that the intermediate node of Network transmission is received and Network message are carried;

In the time of intermediate node in Network transmission, between node and node, encircle the exchange (SWAP) of channel labels, make the transmission of Network message back destination node direction.It should be noted that: intermediate node may be for multiple, the swap operation of this ring channel labels may need to carry out repeatedly, first, second ring channel labels is here only used for distinguishing the operation that two classes are different, the PUSH operation of carrying out in the time of first ring channel labels, and the SWAP carrying out in the time of the second ring channel labels operation.In addition, also it is worth emphasizing that: if entering link point and going out next-door neighbour between link point of Network do not have other intermediate nodes between them, this step will not carried out.

Step S306: the Nodes that goes out to encircle in Network is peeled off the second ring channel labels to realize Network transmission from Network message.

When Network arrives after destination node by one or several intermediate node, destination node will be peeled off (POP) and fall the second ring channel labels from Network message, thereby realize by source node the networking business transmission service to destination node.

The present embodiment not only can be obtained the technique effect of previous embodiment; and the present embodiment is owing to adopting label scheme to set up service aisle and the protection channel of the each node of looped network; and complete the transmission of Network data based on tag operational; and the distribution of label in ring has consistency; make newly-increased or remove legacy network business to service aisle and protection channel without reconfiguring, thereby can realize smooth expansion.

Embodiment tri-

For further illustrating the technical scheme of the embodiment of the present application, further explain (embodiment tri-that forms thus the application) to transmit LSP business on looped network as example below.Referring to Fig. 4, wherein Fig. 4 (a) is the logical level structure of prior art transmission LSP business; Figure (b) is the logical level structure that the present embodiment transmission LSP business has.When prior art is transmitted LSP business on looped network, adopt PW (Pseudo Wire, pseudo-line) layer and LSP layer double-layer structure mechanism, in the time of different node transmission, preset the exchange of ring channel labels at LSP layer, by exchanged form, LSP business is transmitted to destination node, because the path label of this mode is unique associated with LSP business, the service aisle of node can not be shared.The present embodiment is taked three layers of label scheme,, outside PW layer and LSP layer, also increases ring passage (ring tunnel) logical layer, and label swap operation carries out at ring passage (ring tunnel) logical layer.Following flow process has provided the method based on LSP business realizing looped network Steering protection.The method comprises:

The state of the each node link of storage looped network, and by the state variation of detection of connectivity function monitoring looped network node link, in the time that a node link state changes, by APS message, the state of this node link is changed towards the node link direction changing away from state and puts section by section notice to other nodes, change the each node link state of looped network that upgrades storage according to the state of described node link;

Below in conjunction with Fig. 5, the related content of this flow process is elaborated: referring to Fig. 5 (a), the figure shows LSP business in looped network node transmitting procedure under normal circumstances.As shown in the figure; A, B node are respectively as the pressed on ring node of LSP business LSP1, LSP2; the destination node of these two LSP business is D, and node D has ring passage (ring tunnel) the logical layer service aisle of clockwise and counterclockwise ring passage (ring tunnel) logical layer protection channel.While specifically carrying out LSP1 and the transmission of LSP2 business, LSP1 encapsulates PW1 layer and LSP1 layer successively at A node, because node state does not change, the clockwise logic working passage that this service selection destination node is D, so push (PUSH) logic working passage ring label RC3 clockwise at PW1 label and LSP label outer package; AC2 carries out similar processing at B node, encapsulates successively PW2 layer and LSP2 layer, encapsulates clockwise logic working channel labels RC2 simultaneously.Due to loop processed normal condition, intermediate node B, the C of transmission LSP1, LSP2 carries out label swap operation (SWAP) at ring passage (ring tunnel) logical layer respectively.When arriving after destination node D, peel off after the label on (POP) ring passage (ring tunnel) logical layer, then peel off LSP and PW layer, take out LSP1, LSP2 business, thereby realize the transmission of LSP1, LSP2.

Referring to Fig. 5 (b), the figure shows the transmitting procedure of LSP business in the time of the node cycle link occurs fault of encircling between CD.For LSP business LSP1; after node A is known and is broken down between CD; normal to the anticlockwise protection channel of D by analyzing A, node A will switch to counterclockwise protection channel the transport service of LSP1, and on this passage, completes transmission operation similar to the above.For LSP business LSP2, after Node B is known and broken down between CD, Node B is no longer along clockwise service aisle transmission LSP2 business, but transport service is switched to counterclockwise protection channel, and on this passage, completes transmission operation similar to the above.

Referring to Fig. 5 (c), the figure shows the transmitting procedure of LSP business in the time of the node cycle link occurs fault of encircling between AB.For LSP business LSP1; after node A is known and is broken down between CD; normal to the anticlockwise protection channel of D by analyzing A, node A will switch to counterclockwise protection channel the transport service of LSP1, and on this passage, completes transmission operation similar to the above.For LSP business LSP2, after Node B is known and broken down between CD, analyze the service path fault-free of LSP2, continue to select service aisle to carry out the business transmission operation of LSP2.

Above-mentionedly realize in looped network Steering protection process carrying out Network transmission, on can the each node on looped network, safeguard the state of each node link, it is the state of memory node link, concrete storage mode can have multiple implementation, such as, safeguard a loop network topology structure " A-B-C-D-E-F-A ", then at the identification nodes Link State between node between two of this ring network structure, if (YES) represent normal condition with " Y ", " N " (NO) represents malfunction, at above-mentioned loop network topology structure under normal circumstances, node link status indicator is " YYYYYY ", in loop network topology structure, CD node link breaks down in situation, node link status indicator is " YYNYYY ".The Link State of each node storage can be realized in real time or periodically upgrade according to monitoring.Such as, by section layer CC (Continuity Check, detection of connectivity) the state variation of the each node link of fault detection capability monitoring looped network, in the time having node link state to change, the state of this node link is changed towards the node link direction changing away from state and puts section by section notice to other nodes; Change the each node link state of looped network that upgrades storage according to the state of described node link.Take Fig. 5 (b) as example, when node D detects CD intermediate node link occurs fault according to the fault detection capability of the upper every section of link stage casing layer CC of ring, upgrade node link state in the ring topology of oneself storing, " Y " mark that is about to expression normal condition is revised as and represents that " N " of malfunction indicates.Then the direction (counterclockwise) occurring away from fault along ring; node D passes through APS (Automatically Protection Switching to node E; automatically protection exchange agreement) message transmission state change notification; inform CD intermediate node link occurs fault in the current looped network of node E; node E upgrades node link state in the ring topology of oneself storing; be about to " Y " and be revised as " N "; by that analogy; between node, send successively state change notification along counter clockwise direction, until node A upgrades node link state in the ring topology of oneself storing.It should be noted that: in actual application, consider based on efficiency, in the time that a node link breaks down, link-attached two nodes of this malfunctioning node all can detect the generation of fault, at this moment can be by two nodes respectively towards carrying out state change notification away from malfunctioning node link direction, if same node is successively received the state change notification about same node point link, can select to ignore a rear state change notification, forbid that this state change notification continues along former direction transmission simultaneously.Owing to adopting twocouese informing mechanism, which can make the node in looped network be updated to last state within the short as far as possible time, thereby is conducive to improve state-maintenance efficiency.Also have a kind of common situations is to exist plural node link to break down within a period simultaneously, at this moment state-maintenance mode is similar to the mode of an above-mentioned node link fault, carries out state notifying towards the node link direction occurring away from fault respectively.

Looped network node Link State based on above-mentioned each node maintenance, the switching operation that enters the each node link state status of looped network that link point can store by judgement and carry out passage of access network business, judges the each node link state of looped network that enters the storage of link point of Network; When the node link comprising when the transmission path of this Network is all the first preset state, select service aisle transport network traffic; In the time having at least one to be the second preset state in the node link that the transmission path of this Network comprises, select protection channel transport network traffic.First, second preset state is here that looped network node Link State is distinguished, and need not show between preset state, to there is sequencing, such as the first preset state can be that node link breaks down, also can be that node link is normal, also be not used in and show the inevitable logical communication link of existence between preset state, such as, node link state is normal except having, malfunction, can also there are other states.

The present embodiment has illustrated the method for looped network Steering protection by the transmitting procedure of LSP business, but it is emphasized that: the application is not limited to LSP business, is applied to such as pure IP operation, PW business etc. and can expand.

Embodiment tetra-

Above content is the description to the application's embodiment of the method, and correspondingly, the application also provides device embodiment.Referring to Fig. 6, the figure shows the application and realize the device embodiment (embodiment tetra-) that looped network Steering protects.This device embodiment comprises: Path Setup unit 601 and business transmission unit 602, wherein: Path Setup unit 601, for setting up the service aisle corresponding with each node of looped network and protection channel; Business transmission unit 602, for protecting to realize looped network Steering according to service aisle described in the condition selecting of looped network node link or protection channel transport network traffic.

The course of work of this device embodiment is: Path Setup unit 601 is set up after the service aisle and protection channel corresponding with each node of looped network, and business transmission unit 602 is protected to realize looped network Steering according to service aisle described in the condition selecting of looped network node link or protection channel transport network traffic.

This device embodiment is setting up after the service aisle and protection channel corresponding with each node of looped network, protects to realize looped network Steering according to service aisle described in the condition selecting of looped network node link or protection channel transport network traffic.Compared with prior art; because service aisle and the protection channel of this device embodiment are corresponding and no longer interrelated with Network with the node of looped network; total number of channels depends on the number of nodes that looped network comprises; can share from multiple Networks of same node point discrepancy ring service aisle and the protection channel that this node is corresponding; in the Network situation of transmission equal number; reduce generally the quantity of service aisle and protection channel, reduced configuration effort amount and the configuration complexity of the each node of looped network and reduced the hardware requirement to looped network node equipment.In addition,, because total number of channels reduces, for identifying the also minimizing thereupon of number of labels of passage, thereby reduced the management difficulty of path label.

The Path Setup unit of said apparatus embodiment, according to the different modes of setting up node service aisle and protection channel, can have different internal structures.Such as, Path Setup unit 601 can comprise: label distribution subelement 6011 and passage are determined subelement 6012, wherein: and label distribution subelement 6011, distributes ring channel labels for the node of the node next-door neighbour to service aisle to be set up and protection channel; Passage is determined subelement 6012, for determine service aisle and the protection channel of the each node of looped network according to the ring channel labels receiving.This employing label scheme creates the mode of node service aisle and protection channel, can on both direction, carry out: in the time that label distribution subelement 6011 encircles channel labels specifically for distributing to the upstream node being close to wait the node of setting up service aisle and protection channel, passage determines that subelement 6012 is specifically for determining service aisle and the protection channel of the updrift side of the each node of looped network according to the ring channel labels receiving; In the time that sign distribution subelement 6011 encircles channel labels specifically for distributing to the downstream node being close to wait the node of setting up service aisle and protection channel, passage determines that subelement 6012 is specifically for determining service aisle and the protection channel of the downstream direction of the each node of looped network according to the ring channel labels receiving.

In like manner, the business transmission unit of said apparatus embodiment is logical according to different Network transmission meanss, can have different internal structures.Such as, business transmission unit 602 can comprise: label pushes subelement 6021, label commutator unit 6022 and label peeling subelement 6023, wherein: label pushes subelement 6021, for when according to after the state variation selection service aisle of looped network node link or protection channel, the first ring channel labels that link point receives that enters of Network is pushed to network service message; Label commutator unit 6022, the first label exchange that the second ring channel labels receiving for the intermediate node that Network is transmitted and Network message are carried; Label peeling subelement 6023, peels off the second ring channel labels to realize Network transmission for the Nodes that goes out to encircle in Network from Network message.For different types of service, the structure of above-mentioned business transmission unit also may further change, such as, in the time that Network is LSP business, described service aisle or protection channel comprise ring passage (ring tunnel) logical layer, above-mentioned label pushes subelement specifically for when selecting after service aisle or protection channel according to the state variation of looped network node link, by ring passage (ring tunnel) logical layer that enters first ring channel labels that link point receives and push transmission LSP service message of LSP business; Above-mentioned label commutator unit exchanges in ring passage (ring tunnel) logical layer and the first ring channel labels of transmission LSP service message specifically for the second label that the intermediate node of Network transmission is received, above-mentioned label peeling subelement, peels off the second ring channel labels to realize the transmission of LSP business for the Nodes that goes out to encircle in LSP business from ring passage (ring tunnel) logical layer of transmission LSP service message.

Said apparatus embodiment can also be by being provided for the state storage unit of the each node link state of storage networking, in this case, business transmission unit 602 can also comprise: state judgment sub-unit 6024, first passage chooser unit 6025 and second channel chooser unit 6026, wherein: state judgment sub-unit 6024, for judging the each node link state of looped network that enters the storage of link point of Network; First passage chooser unit 6025, while being all the first preset state, selects service aisle transport network traffic for the node link comprising at the transmission path of this Network; Second channel chooser unit 6026, while having at least one to be the second preset state, selects protection channel transport network traffic for the node link comprising at the transmission path of this Network.

When said apparatus embodiment increases after state storage unit, can also further according to the state variation of looped network, the state of state storage unit storage be carried out timing or be periodically updated, to accurately reflect the truth of the present node link of looped network.Such as said apparatus embodiment can realize the renewal to node link state by following structure: state variation monitoring means 603, variable condition notification unit 604 and state updating unit 605, wherein: state transformation monitoring means 603, for monitoring the state variation of the each node link of looped network; Status change notification unit 604, in the time that a node link state changes, changes the state of this node link towards the node link direction changing away from state and puts section by section notice to other nodes; State updating unit 605, for changing the each node link state of looped network that upgrades cell stores according to the state of described node link.Described state variation monitoring means specifically can also be realized by section layer CC measuring ability the object of the state variation of monitoring looped network node link, and described status change notification unit specifically can also be changed the state of node link towards the node link direction changing away from state and put section by section notice to other nodes by APS message.

Said apparatus embodiment can be for the treatment of LSP business; but in actual application, the application also provides a kind of device based on LSP business realizing looped network Steering protection; be exclusively used in LSP business is processed, this device can be obtained the application's technique effect equally.This device can comprise: service aisle protection channel is set up unit, node link state-maintenance unit, service aisle protection channel switch unit and LSP business transmission unit, wherein:

Described node link state-maintenance unit, for storing the state of the each node link of looped network, and by the state variation of section layer CC measuring ability monitoring looped network node link, in the time that a node link state changes, by APS message, the state of this node link is changed towards the node link direction changing away from state and puts section by section notice to other nodes, change the each node link state of looped network that upgrades storage according to the state of described node link;

For convenience of description, while describing above device, being divided into various unit with function describes respectively.Certainly, in the time implementing the application, the function of each unit can be realized in same or multiple software and/or hardware.Such as; all functional units can be formed to a single unit system; transmit to realize looped network Steering protection for the Network of controlling in whole looped network; all functional units can also be distributed on each looped network node, cooperatively interact and realize the allomeric function of this device embodiment by these nodes functional unit separately.

As seen through the above description of the embodiments, those skilled in the art can be well understood to the mode that the application can add essential general hardware platform by software and realizes.Based on such understanding, the part that the application's technical scheme contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions (can be personal computers in order to make a computer equipment, server, or the network equipment etc.) carry out the method described in some part of each embodiment of the application or embodiment.

Each embodiment in this specification all adopts the mode of going forward one by one to describe, between each embodiment identical similar part mutually referring to, what each embodiment stressed is and the difference of other embodiment.Especially,, for system embodiment, because it is substantially similar in appearance to embodiment of the method, so describe fairly simplely, relevant part is referring to the part explanation of embodiment of the method.System embodiment described above is only schematic, the wherein said unit as separating component explanation can or can not be also physically to separate, the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in multiple network element.Can select according to the actual needs some or all of module wherein to realize the object of the present embodiment scheme.Those of ordinary skills, in the situation that not paying creative work, are appreciated that and implement.

The application can be used in numerous general or special purpose computingasystem environment or configuration.For example: personal computer, server computer, handheld device or portable set, plate equipment, multicomputer system, system, set top box, programmable consumer-elcetronics devices, network PC, minicom, mainframe computer based on microprocessor, comprise distributed computing environment (DCE) of above any system or equipment etc.

The application can describe in the general context of the computer executable instructions of being carried out by computer, for example program module.Usually, program module comprises and carries out particular task or realize routine, program, object, assembly, data structure of particular abstract data type etc.Also can in distributed computing environment (DCE), put into practice the application, in these distributed computing environment (DCE), be executed the task by the teleprocessing equipment being connected by communication network.In distributed computing environment (DCE), program module can be arranged in the local and remote computer-readable storage medium including memory device.

The above is only the application's embodiment; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the application's protection range.

Claims

1. a method that realizes looped network Steering protection, is characterized in that, the method comprises:

Be switched to described service aisle or protection channel transport network traffic to realize looped network Steering protection according to the state of looped network node link.

2. method according to claim 1, is characterized in that, service aisle and protection channel that described foundation is corresponding with each node of looped network comprise:

3. method according to claim 2, is characterized in that,

When in the time setting up node next-door neighbour's the upstream node distribution ring channel labels of service aisle and protection channel, determine service aisle and the protection channel of the updrift side of the each node of looped network according to the ring channel labels receiving;

When in the time setting up node next-door neighbour's the downstream node distribution ring channel labels of service aisle and protection channel, determine service aisle and the protection channel of the downstream direction of the each node of looped network according to the ring channel labels receiving.

4. method according to claim 3, is characterized in that, the described state variation according to looped network node link is switched to service aisle or protection channel transport network traffic comprises:

5. method according to claim 4, is characterized in that, in the time that Network is LSP business, described service aisle or protection channel comprise ring channel logic layer,

6. according to the method described in any one in claim 1 to 5; it is characterized in that; described method also comprises: the state of the each node link of storage looped network, and the described state variation according to looped network node link is switched to service aisle or protection channel transport network traffic comprises:

7. method according to claim 6, is characterized in that, described method also comprises:

The state variation of the each node link of monitoring looped network;

8. method according to claim 7, is characterized in that,

The state variation of the each node link of described monitoring looped network is specially: by the state variation of detection of connectivity function monitoring looped network node link;

The described change of the state by node link is put section by section notice towards the node link direction changing away from state and is specially to other nodes: the node link direction state change court of node link being changed away from state by APS message is put notice section by section to other nodes.

9. the method based on LSP business realizing looped network Steering protection, is characterized in that, the method comprises:

10. a device of realizing looped network Steering protection, is characterized in that, this device comprises: Path Setup unit and business transmission unit, wherein:

Described business transmission unit, for protecting to realize looped network Steering according to service aisle described in the condition selecting of looped network node link or protection channel transport network traffic.

11. devices according to claim 10, is characterized in that, described Path Setup unit comprises: label distribution subelement and passage are determined subelement, wherein:

12. devices according to claim 11, is characterized in that,

In the time that described label distribution subelement encircles channel labels specifically for distributing to the upstream node being close to wait the node of setting up service aisle and protection channel, described passage determines that subelement is specifically for determining service aisle and the protection channel of the updrift side of the each node of looped network according to the ring channel labels receiving;

In the time that described label distribution subelement encircles channel labels specifically for distributing to the downstream node being close to wait the node of setting up service aisle and protection channel, described passage determines that subelement is specifically for determining service aisle and the protection channel of the downstream direction of the each node of looped network according to the ring channel labels receiving.

13. devices according to claim 12, is characterized in that, described business transmission unit comprises: label pushes subelement, label commutator unit and label peeling subelement, wherein:

14. devices according to claim 13, is characterized in that, in the time that Network is LSP business, described service aisle or protection channel comprise ring channel logic layer,

Described label commutator unit exchanges in ring channel logic layer and the first ring channel labels of transmission LSP service message specifically for the second ring channel labels that the intermediate node of Network transmission is received;

15. according to claim 10 to the device described in any one in 14, it is characterized in that, described device also comprises state storage unit, for storing the state of the each node link of looped network, described business transmission unit comprises: state judgment sub-unit, first passage chooser unit and second channel chooser unit, wherein:

16. devices according to claim 15, is characterized in that, described device also comprises state variation monitoring means, status change notification unit and state updating unit, wherein:

17. devices according to claim 16, is characterized in that,

Described state variation monitoring means is specifically for passing through the state variation of detection of connectivity function monitoring looped network node link;

Described status change notification unit is specifically for being changed the state of node link towards the node link direction changing away from state and put section by section notice to other nodes by APS message.

18. 1 kinds of devices based on LSP business realizing looped network Steering protection; it is characterized in that; this device comprises: service aisle protection channel is set up unit, node link state-maintenance unit, service aisle protection channel switch unit and LSP business transmission unit, wherein: