CN103067275B - A kind of method for building up of label switched path and system - Google Patents
A kind of method for building up of label switched path and system Download PDFInfo
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Abstract
The invention discloses the method for building up of a kind of label switched path (LSP), described method comprises: the first node of LSP calculates the routing information of process needed for LSP to be set up according to management plane request and network topological information; The first signaling message hop-by-hop that the first node of LSP carries the Link Flags information after expansion according to the routing information tissue obtained sends to downstream node, until the tail node of LSP receives described first signaling message and the success of configuration transmission level-crossing; The tail node of LSP receives described first signaling message and after configuration transmits level-crossing success, organizes the second signaling message hop-by-hop to send to upstream node, until the first node of LSP receives described second signaling message and configuration transmits level-crossing success.What the present invention also also disclosed a kind of LSP sets up system, adopts the present invention, adds link heavy-route attribute, also enriched the type of LSP, reaches the effect that more intelligent protection recovers.
Description
Technical field
The present invention relates to label switched path (LSP, the Label Switching Path) technology of the communications field, particularly relate to method for building up and the system of a kind of LSP.
Background technology
Along with the development of the large fusion of network and network flattening, boundary between original different type network is fuzzy gradually, the multitiered network of the broad sense under Unified Control Plane becomes the target of people's pursuit, finally realize scheduling flexible and efficient between different layers network, with the management of optimized network business and the survivability improving network.
When network failure, carry out failover in time, Logistics networks application is unaffected.Concrete, in RFC (Request For Comments) 4427, the protection in LSP is recovered (Recovery) and be divided into: link (this locality) protection recovers (Span recovery), segment protect recovers (Segment recovery) and end-to-end protection recovers (End-to-End recovery); Wherein, link protection recovers to be the protection by recovering to reach LSP to the protection of LSP two internodal links, and described link protection recovers to be subdivided into again link protection and link-recovery two kinds of modes.
RFC 4202 defines link protection type to represent the protective capability of link in the Routing expansion of general multiple protocols mark exchange agreement (GMPLS, Generalized MultiprotocolLabel Switching); RFC 3471 is in the signaling capability of GMPLS describes, and define protection (PROTECTION) object, wherein, the Link Flags (Link Flags) comprised represents the protective capability of LSP link.
The attribute of service layer is summed up in the point that in the link protection attribute of client layer chain-link by existing standard, and link attribute only has protection association attributes at present, as: unprotect, special 1+1 protection, special 1: 1 protection, share protect, enhancing protection; But these link protection attributes can only describe the link with protection, if recover attribute for client layer provides service layer's business of service to have or protect the attribute recovering to combine, then the attribute that its link formed has does not define at present.
At present; by ospf (OSPF; Open Shortest Path First) flooding mechanism by information inundations such as link protection types to the whole network node; the path-calculating element of each node combines the request of foundation; select the link meeting link protection type; and by RSVP (RSVP; ResourceReservation Protocol) signaling sets up LSP on corresponding link; like this, the LSP of foundation just can have the link protection ability of definition in RFC 4427.
In multitiered network, comprise client layer and service layer, the link that client layer LSP uses can be provided by service layer LSP, and accordingly, protection (recovery) ability of this link also just embodied by protection (recovery) ability of service layer LSP; In multitiered network, a LSP is provided with between the boundary node of layer, if using the traffic engineering (TE of this LSP as client layer, Traffic Engineering) link carries out inundation, so, this LSP can be described as forwarding adjacency label switched path (FA-LSP, Forwarding Adjacency LSP), and this TE Link can be described as FA; There is not Routing Adjacency relation between the end points of FA, but there are signaling neighbouring relations.
But, in existing protocol, do not mention this how value of link protection type of FA; Meanwhile, do not mention the LSP how setting up and there is link-recovery ability in existing protocol yet and there is the LSP that link protection recovers binding ability.
Summary of the invention
In view of this, main purpose of the present invention is the method for building up and the device that provide a kind of LSP, can set up the LSP with link-recovery ability or link protection recovery binding ability, enrich the type of LSP, thus realize more intelligent protection reset mode.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of method for building up of label switching path LSP, described method comprises:
The first node of LSP calculates the routing information of process needed for LSP to be set up according to management plane request and network topological information;
The first node of LSP carries the first signaling message of the Link Flags information after expansion according to the routing information tissue obtained, and described first signaling message hop-by-hop is sent to downstream node, until the tail node of LSP receives described first signaling message and the success of configuration transmission level-crossing; Wherein, the Link Flags information after described expansion comprises the type information of link heavy-route type information and link protection recovery combination;
The tail node of LSP receives the first signaling message and after configuration transmits level-crossing success, organize the second signaling message and the second signaling message hop-by-hop is sent to upstream node, and each upstream node transmits level-crossing success according to described second signaling information configuration, until the first node of LSP receives the second signaling message and configures transmit level-crossing success.
In such scheme, the first node of described LSP calculates the routing information of process needed for LSP to be set up according to management plane request and network topological information before, the method also comprises:
By ospf flooding mechanism, link protection type information, link heavy-route type information are flooded to the whole network node.
In such scheme, described first signaling message hop-by-hop is sent to downstream node before, the method also comprises:
Judge the first signaling message hop-by-hop to send to the node of downstream node whether to there is the link satisfied condition, if there is the link satisfied condition, then apply on said link and reserve resource, and the first signaling message being sent to the downstream node be adjacent; Otherwise, determine whether to need to set up forwarding adjacency FA at described node.
In such scheme, described in determine whether need set up FA at described node, for:
Judge whether described node is whether mixed node exists FA, if described node is mixed node and there is not FA, then need to set up FA at described node; Otherwise, do not need to set up FA at described node.
In such scheme, described in determine whether need set up FA at described node, comprise further:
If need to set up FA at described node, then hang up client layer first signaling message, and create the delivery port of FA needs; If do not need to set up FA at described node, then return LSP and set up failure response.
What present invention also offers a kind of LSP sets up system, and described system comprises: first node and tail node; Wherein,
Described first node, for calculating the PATH of process needed for LSP to be set up according to management plane request and network topology message, tissue carries the first signaling message of the Link Flags information after expansion, and described first signaling message hop-by-hop is sent to downstream node, until the tail node of LSP receives the first signaling message and the success of configuration transmission level-crossing; Wherein, the Link Flags information after described expansion comprises the type information of link heavy-route type information and link protection recovery combination;
Described tail node, for organizing the second signaling message hop-by-hop to send upstream node, until the first node of LSP receives the second signaling message and the success of configuration transmission level-crossing.
In such scheme, described system also comprises:
Intermediate node, for receiving the signaling message of upstream node or the downstream node be adjacent, and sends to the downstream node or upstream node that are adjacent by described signaling message; And each intermediate node transmits level-crossing success according to described second signaling information configuration.
In such scheme, described first node, tail node and intermediate node include link judging unit and FA creates judging unit; Wherein,
Whether described link judging unit, exist the link satisfied condition for decision node, if there is the link satisfied condition, then node is applied on said link and reserved resource, and organizes the first signaling message to send to the downstream node be adjacent;
Described FA creates judging unit, needs to set up FA at node for determining whether.
In such scheme, described FA create judging unit specifically for: whether decision node is mixed node and whether there is FA, if described node is mixed node and there is not FA, then determines to need to set up FA at described node; Otherwise, determine not need to set up FA at described node.
In such scheme, described FA create judging unit also for: determine to need when described node sets up FA, described node hangs up client layer first signaling message, and creates the delivery port that FA needs; Determine not need to set up FA at described node, described node returns LSP and sets up failure response.
The method for building up of LSP provided by the present invention and system, on the basis of existing link protection attribute, add link heavy-route attribute, and it is abundanter, more flexible to make link protection recover attribute, and then the LSP with link-recovery ability or link protection recovery binding ability can be set up; Meanwhile, also enrich the type of LSP, reach more intelligent protection recovery effects.
The present invention is also by increasing the method for link heavy-route type; represent the link-recovery type of service layer in multitiered network; by the combination that the link protection that link heavy-route type and link protection type are combined presentation services layer recovers; with the method that protection more eurypalynous under realizing multitiered network recovers; also make setting up of client layer business convenient, it is more that multilayer service protection recovers combination.
Accompanying drawing explanation
Fig. 1 is the link heavy-route type schematic diagram that the present invention increases newly;
Fig. 2 is the PROTECTION object schematic diagram in existing standard;
Fig. 3 is the PROTECTION object schematic diagram after the present invention expands;
Fig. 4 is the realization flow schematic diagram that the present invention sets up the LSP method with link-recovery ability or link protection recovery binding ability;
Fig. 5 embodiment of the present invention needs the realization flow schematic diagram of the client layer LSP process of establishing automatically setting up FA-LSP;
Fig. 6 embodiment of the present invention does not need the realization flow schematic diagram of the client layer LSP process of establishing automatically setting up FA-LSP;
Fig. 7 is the composition structural representation that a kind of LSP of the embodiment of the present invention sets up system;
Fig. 8 is the composition structural representation of embodiment of the present invention node.
Embodiment
Below in conjunction with drawings and the specific embodiments, further detailed description is remake to the present invention.
Fig. 1 is the link heavy-route type schematic diagram that the present invention increases newly, as shown in Figure 1, newly-increased link subtype-Length Value (TLV, Type-Length-Value) type is link heavy-route type (LinkRerouting Type), accounts for 32 bits; Comprise: heavy-route head (Rerouting Cap) field, accounts for 8 bits; Retain (Reserved) field, account for 24 bits.
Described link heavy-route type is used for representing the reroute capability of link, and be namely used for representing the recovery capability of link, its value mode comprises:
0x00:No Rerouting, indicates without heavy-route;
0x01:(Full) Rerouting, represents (completely) heavy-route.
The present invention is not limited to certain specific extended mode, as long as link heavy-route type information can be flooded to the whole network node.
Fig. 2 is the PROTECTION object schematic diagram in existing standard, Fig. 3 is the PROTECTION object schematic diagram after the present invention expands, as shown in Figure 3, the Link Flags (Link Flags) of 6 bits original in existing standard is expanded to 8 bits by the present invention, and the Link Flags value after expansion comprises:
0x01:Extra Traffic (extra traffic);
0x02:Unprotected (unprotect);
0x04:Shared (share protect);
0x08:Dedicated1: 1 (special 1: 1 protection);
0x10:Dedicated 1+1 (special 1+1 protection);
0x20:Enhanced (strengthening protection);
0x40:(Full) Routing ((completely) heavy-route);
0x80: retain.
Wherein, latter two value, namely 0x40 and 0x80 is newly-increased value, can arrange a more than bit, to represent the type that multiple link protection type, link heavy-route type or link protection and recovery combine.But the present invention is not limited to certain specific extended mode, as long as the Link Flags information after the expansion that LSP can be needed is delivered to downstream node.
Fig. 4 is the realization flow schematic diagram that the present invention sets up the method for the LSP with link-recovery ability or link protection recovery binding ability, and as shown in Figure 4, the method comprises the following steps:
The first node of step 401:LSP calculates the routing information of process needed for LSP to be set up according to management plane request and network topological information;
Concrete, described routing information comprises routing iinformation, layer boundary information, link resource information etc.;
The first node of step 402:LSP carries the first signaling message of the Link Flags information after expansion according to the routing information tissue obtained, and described first signaling message hop-by-hop is sent to downstream node, until the tail node of LSP receives described first signaling message and the success of configuration transmission level-crossing; Wherein, the Link Flags information after described expansion comprises the type information of link heavy-route type information and link protection recovery combination;
Concrete, described first signaling message can be, but not limited to path (Path) message, comprises link protection and link-recovery capabilities message that described LSP wishes in described first signaling message.
Because the Link Flags of the PROTECTION object in existing standard expands by the present invention, Link Flags after expansion adds (completely) heavy-route and retains two values, and newly-increased value can arrange a more than bit, can represent the combination of multiple protect types or protection & restoration; So, the link heavy-route kind of message that LSP needs can be delivered to downstream node by the Link Flags after expansion.
Such as, if the link protection that client layer LSP requires is respectively with recovery type: unprotect and (completely) heavy-route, namely wish client layer unprotect recovery capability, only there is recovery capability in service layer; So, for Path signaling, that is: the Link Flags value of PROTECTION object is 0x42 (unprotect and complete rerouting), and LSP Flags value is 0x00 (unprotect).
Concrete, described first signaling message hop-by-hop is sent to downstream node, comprise further:
The first signaling message hop-by-hop is judged to send to the node of downstream node whether to there is the link satisfied condition, if there is the link satisfied condition, then apply on the link and reserve link circuit resource, and the first signaling message being sent to the downstream node be adjacent; Otherwise, determine whether to need to set up FA at described node.
Concrete, described in determine whether to need to set up FA at described node and be: judge whether described node is mixed node and whether there is FA, if described node is mixed node and there is not FA, then need to set up FA at described node; Otherwise, do not need to set up FA at described node.
Here, described mixed node is: the node that simultaneously there is client layer and service layer's configuration.
Concrete, described in determine whether to need to set up FA at described node, comprise further:
If need to set up FA at this node, then hang up client layer first signaling message, and create the delivery port of FA needs; If do not need to set up FA at this node, return LSP and set up failure response.
Here, do not need if described to set up FA at this node, return LSP and set up failure response, comprise further: if node headed by this node, then first node returns the first signaling message failure response; If this node is non-first node, then by this joint structure the 3rd signaling message and hop-by-hop sends to upstream node, until first node receives the 3rd signaling message.
Here, described 3rd signaling message is the first signaling message failure response, and namely LSP sets up failure response; Described 3rd signaling message can be but be not limited to path error (PathErr) message.
Concrete, described hang-up client layer first signaling message, and the delivery port creating FA needs, also comprise:
The protection obtaining service layer LSP from client layer first signaling message recovers information, service layer's link is applied for and reserves resource, and organization service layer first signaling message hop-by-hop sends to downstream node, until the tail node of service layer receives service layer first signaling message and the success of configuration transmission level-crossing; The tail node of service layer receives service layer first signaling message and after configuration transmits level-crossing success, create in tail node the delivery port generating FA needs also to need to activate FA simultaneously, and organization service layer second signaling message hop-by-hop sends to upstream node, until the first node of service layer receives the second signaling message and the success of configuration transmission level-crossing, and activate the delivery port of the FA link of the first node of service layer, cancel the hang-up of client layer first signaling message, thus the transmission of client layer first signaling message can be continued.
Here, if described node is first node or the tail node of FA-LSP, needs to create the delivery port generating FA and need, also need to activate FA simultaneously, and FA information is flooded in network, so that the foundation of client layer LSP.
The tail node of step 403:LSP receives the first signaling message and after configuration transmits level-crossing success, organize the second signaling message and the second signaling message hop-by-hop is sent to upstream node, and each upstream node transmits level-crossing success according to described second signaling information configuration, until the first node of LSP receives the second signaling message and configures transmit level-crossing success;
Wherein, described second signaling message can be but be not limited to reserve (Resv) message.
The embodiment of Fig. 5, Fig. 6 is all increased link heavy-route attribute newly in the present invention, and to carrying out when in existing standard, the Link Flags of PROTECTION object expands.
Owing to having the link of link protection ability, can be realized by pre-configured different protect types on the link, also can by setting up the LSP with protective capability and generating FA to realize; The former needs manually configuration protection group information, and the latter can automatically be set up by control plane and configure the FA-LSP with protective capability.And have link-recovery ability link or have link protection recover binding ability link can only by have recovery capability FA-LSP, there is protection recover the FA-LSP of binding ability and provide.Fig. 5 gives the process of establishing of the client layer LSP that FA-LSP set up automatically by needs, and Fig. 6 gives the process of establishing of the client layer LSP not needing automatically to set up FA-LSP.
Fig. 5 is the realization flow schematic diagram of the client layer LSP process of establishing needing automatically to set up FA-LSP, in the present embodiment, the link protection that client layer LSP requires and recovery type are respectively: unprotect and (completely) heavy-route, namely wish client layer unprotect recovery capability, only there is recovery capability in service layer; In Fig. 5, node headed by node a, and be non-mixed node; Node i, k are mixed node, and node j, j+1, z are non-mixed node; Wherein, node i and node k are respectively first node and the tail node of service layer LSP, and node z is the tail node of client layer LSP; And between node a and node i, between node k and node z, all there is client layer chain-link, there is not client layer chain-link between node i and node k, need the delivery port creating FA between node i and node k; But equal presence service layer link between node i and node j, between node j and node j+1, between node j+1 and node k; As shown in Figure 5, described LSP Establishing process comprises the following steps:
Step 501: the node a of client layer LSP according to management plane request and network topological information calculate this LSP the routing information of process;
Here, described LSP the path of process comprise mixed node i, k, non-mixed node j, j+1, z.
Step 502: because node a is non-mixed node, and the client layer chain-link between node a and node i exists, and this client layer chain-link is applied for and reserves resource, and the downstream node i organizing the first signaling message to send to be adjacent;
Concrete; link protection and link-recovery capabilities message that described LSP wishes is comprised in described first signaling message; for Path signaling; that is: the Link Flags value of PROTECTION object is 0x42 (unprotect and complete rerouting), and LSP Flags value is 0x00 (unprotect).
Step 503: after node i receives the first signaling message, because node i is mixed node, and the link that client layer needs does not exist, then hang up client layer first signaling message, request creates the delivery port that FA needs, the protection obtaining service layer LSP from client layer first signaling message recovers information, service layer's link is applied for and reserves resource, and organization service layer first signaling message sends to the downstream node j be adjacent;
Here; for Path signaling; because the Link Flags value of the PROTECTION object in client layer first signaling message is 0x42; illustrate that the protection recovery capability of service layer is only unprotect and complete rerouting; therefore; construct protection recovery capability and the link protection recovery capability of LSP in service layer first signaling message, that is: the LSP Flags value of PROTECTION object is 0x01 (complete rerouting), and LinkFlags value is 0x02 (unprotect).
Step 504: after node j receives the first signaling message, because node j is non-mixed node, and and service layer's link between node j+1 exist, apply on the link and reserve resource, and the first signaling message being sent to the downstream node j+1 be adjacent;
Now, the Link Flags value of PROTECTION object is 0x02 (unprotect), LSP Flags value 0x01 (complete rerouting).
Step 505: after node j+1 receives the first signaling message, because node j+1 is non-mixed node, and and service layer's link between node k exist, apply on the link and reserve resource, and the first signaling message being sent to the downstream node k be adjacent;
Step 506: after node k receives the first signaling message, be mixed node due to node k and be the tail node of service layer LSP, therefore, request creates the delivery port generating FA and need, service layer's link to be applied for and after reserving resource, configuration transmits level-crossing success, and the upstream node j+1 organizing the second signaling message to send to be adjacent, activate the delivery port of FA link simultaneously;
Step 507: after node j+1 receives the second signaling message, because node j+1 is non-mixed node, configuration transmits level-crossing success, and the upstream node j sending to it adjacent second signaling message;
Step 508: after node j receives the second signaling message, because node j is non-mixed node, configuration transmits level-crossing success, and the second signaling message is sent to the upstream node i be adjacent;
Step 509: after node i receives the second signaling message, be mixed node due to node i and be the first node of service layer LSP, configuration transmits level-crossing success, and activates the delivery port of FA link, cancel the hang-up of client layer first signaling message, continue client layer first signaling message; Node i is applied for and is reserved client layer resource on the port of the new FA link activated; and the downstream node k sending to it adjacent first signaling message; link protection and link-recovery ability that this LSP wishes is comprised in wherein said first signaling message; that is: the Link Flags value of PROTECTION object is 0x42 (unprotect and complete rerouting), and LSPFlags value is 0x00 (unprotect).
Step 510: after node k receives the first signaling message, because the client layer chain-link between node z exists, applies on the link and reserves resource, and the first signaling message is sent to the downstream node z be adjacent;
Here, the Link Flags value of PROTECTION object is 0x42 (unprotect and complete rerouting), and LSP Flags value is 0x00 (unprotect).
Step 511: after node z receives the first signaling message, is non-mixed node due to node z and is the tail node of client layer LSP, configuration transmits level-crossing success, and the upstream node k organizing the second signaling message to send to it adjacent;
Step 512: after node k receives the second signaling message, configuration transmits level-crossing success, and the upstream node i sending to it adjacent second signaling message;
Step 513: after node i receives the second signaling message, configuration transmits level-crossing success, and the upstream node a sending to it adjacent second signaling message;
Step 514: after node a receives the second signaling message, is non-mixed node due to node a and is the first node of client layer LSP, configuration transmits level-crossing success, and client layer LSP is successfully established.
The protective capability of the FA that the FA-LSP of above-mentioned automatic foundation is formed is 0x02 unprotect, and recovery capability is 0x01 (completely) heavy-route.
Fig. 6 is the realization flow schematic diagram that the present invention does not need automatically to set up the client layer LSP process of establishing of FA-LSP, in the present embodiment, the link protection that client layer LSP requires recovers type and is respectively unprotect and (completely) heavy-route, namely wish client layer unprotect recovery capability, only there is recovery capability in service layer; In Fig. 6, node headed by described node a; Node i, k are mixed node, and node z is non-mixed node, and node z is the tail node of client layer LSP; Node a and node i, node i and node k, between node k and node z, all there is client layer chain-link, do not need the delivery port creating FA between node i and node k; As shown in Figure 6, described LSP Establishing process comprises the following steps:
Step 601: the node a of client layer LSP according to management plane request and network topological information calculate this LSP the routing information of process;
Here, the LSP that calculates described in the path of process comprise mixed node i, k, and non-mixed node z.
Step 602: because node a is non-mixed node, and and client layer chain-link between node i exist, apply on the link and reserve resource, and the downstream node i organizing the first signaling message to send to be adjacent;
Concrete, comprise link protection and link-recovery ability that described LSP wishes in described first signaling message.
Concrete, for Path signaling, the Link Flags value of PROTECTION object is 0x42 (unprotect and complete rerouting), and LSP Flags value is 0x00 (unprotect).
Step 603: after node i receives the first signaling message because and client layer chain-link between node k exist, so the first signaling message to be sent to the downstream node k be adjacent;
Step 604: after node k receives the first signaling message because and client layer chain-link between node z exist, so the first signaling message to be sent to the downstream node z be adjacent;
Step 605: after node z receives the first signaling message, is non-mixed node due to node z and is the tail node of LSP, configuration transmits level-crossing success, and the upstream node k organizing the second signaling message to send to be adjacent;
Step 606: after node k receives the second signaling message, configuration transmits level-crossing success, and the second signaling message is sent to the upstream node i be adjacent.
Step 607: after node i receives the second signaling message, configuration transmits level-crossing success, and the second signaling message is sent to the upstream node a be adjacent;
Step 608: after node a receives the second signaling message, is non-mixed node due to node a and is the first node of LSP, configuration transmits level-crossing success, and client layer LSP is successfully established.
In this example, although node i and node k are mixed node, but, because FA exists, so do not need the delivery port setting up FA needs, first signaling message hop-by-hop directly can be sent to downstream node by client layer, until tail node receives the first signaling message, configuration transmits level-crossing success, and organizes the second signaling message by tail node, and hop-by-hop sends to upstream node, until first node receives the second signaling message, configuration transmits level-crossing success, and so, client layer LSP has set up.
Obviously, when the protection recovery capability that client layer sets up the link that LSP will use meets the demands, if the link protection that client layer LSP requires recovers type be respectively special 1+1 protection and (completely) heavy-route, namely wish client layer unprotect recovery capability, service layer has protection and recovers binding ability (existing protection has recovery capability again); So; no matter the need of automatically setting up FA-LSP; all only need the link protection recovery capability in client layer first signaling to be expressed as protection recovery to combine; for Path signaling; now the Link Flags value of PROTECTION object is 0x50 (privacy protection and (completely) heavy-route), and LSP Flags value is 0x00 (unprotect).
If the link protection that client layer LSP requires recovers type be respectively unprotect and (completely) heavy-route, require that the protection recovery capability of client layer is 1+1 bidirectional protective simultaneously, namely wish that client layer has protective capability, there is recovery capability (client layer protection and service layer recover to combine) in service layer; So; no matter the need of automatically setting up FA-LSP; all only need the link protection recovery capability in client layer first signaling to be expressed as protection recovery to combine; for Path signaling; now the Link Flags value of PROTECTION object is 0x40 ((completely) heavy-route), and LSP Flags value is 0x10 (1+1 bidirectional protective).
The present invention, by the PROTECTION object after expansion, can recover to carry out collocation flexibly to meet miscellaneous service scene to the protection of client layer and service layer, enrich protection and recovered type.
Fig. 7 is the composition structural representation that a kind of LSP of the embodiment of the present invention sets up system, and as shown in Figure 7, this system comprises first node 71 and tail node 73, wherein:
Described first node 71, for calculating the routing information of process needed for LSP to be set up according to management plane request and network topological information, tissue carries the first signaling message of the Link Flags information after expansion, and described first signaling message hop-by-hop is sent to downstream node, until the tail node 73 of LSP receives the first signaling message and the success of configuration transmission level-crossing; Wherein, the Link Flags information after described expansion comprises the type information of link heavy-route type information and link protection recovery combination;
Wherein, link protection and link-recovery ability information that described LSP wishes is comprised in described first signaling message.
Described tail node 73, for organizing the second signaling message and the second signaling message hop-by-hop being sent to upstream node, until the first node 71 of LSP receives the second signaling message and the success of configuration transmission level-crossing.
Further, described system also comprises:
Intermediate node 72, for receiving the signaling message of upstream node or the downstream node be adjacent, and sends to the downstream node or upstream node that are adjacent by described signaling message; And each intermediate node transmits level-crossing success according to the described second signaling information configuration received.
No matter first node, tail node, or intermediate node, all can adopt the node composition structure shown in Fig. 8, as shown in Figure 8, described node comprises link judging unit 81 and FA creates judging unit 82; Wherein,
Whether described link judging unit 81, exist the link satisfied condition for decision node, if there is the link satisfied condition, then node is applied on the link and reserved resource, and the first signaling message is sent to the downstream node be adjacent;
Described FA creates judging unit 82, needs to set up FA at node for determining whether.
Concrete, described FA create judging unit 82 specifically for:
Whether decision node is mixed node and whether there is not FA, if described node is mixed node and there is not FA, then needs to set up FA at described node; Otherwise, do not need to set up FA at described node.
Concrete, determine to need to set up FA at this node if FA creates judging unit 82, then described node hangs up client layer first signaling message, and creates the delivery port of FA needs;
Determine not need to set up FA at this node if FA creates judging unit 82, then described node returns LSP and sets up failure response.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.
Claims (10)
1. a method for building up for label switching path LSP, is characterized in that, described method comprises:
The first node of LSP calculates the routing information of process needed for LSP to be set up according to management plane request and network topological information;
The first node of LSP carries the first signaling message of the Link Flags information after expansion according to the routing information tissue obtained, and described first signaling message hop-by-hop is sent to downstream node, until the tail node of LSP receives described first signaling message and the success of configuration transmission level-crossing; Wherein, the Link Flags information after described expansion comprises the type information of link heavy-route type information and link protection recovery combination;
The tail node of LSP receives the first signaling message and after configuration transmits level-crossing success, organize the second signaling message and the second signaling message hop-by-hop is sent to upstream node, and each upstream node transmits level-crossing success according to described second signaling information configuration, until the first node of LSP receives the second signaling message and configures transmit level-crossing success;
Wherein, link protection and link-recovery capabilities message that described LSP wishes is comprised in described first signaling message.
2. method according to claim 1, is characterized in that, the first node of described LSP calculates the routing information of process needed for LSP to be set up according to management plane request and network topological information before, the method also comprises:
By ospf flooding mechanism, link protection type information, link heavy-route type information are flooded to the whole network node.
3. method according to claim 1, is characterized in that, described first signaling message hop-by-hop is sent to downstream node before, the method also comprises:
Judge the first signaling message hop-by-hop to send to the node of downstream node whether to there is the link satisfied condition, if there is the link satisfied condition, then apply on said link and reserve resource, and the first signaling message being sent to the downstream node be adjacent; Otherwise, determine whether to need to set up forwarding adjacency FA at described node.
4. method according to claim 3, is characterized in that, described in determine whether need set up FA at described node, for:
Judge whether described node is whether mixed node exists FA, if described node is mixed node and there is not FA, then need to set up FA at described node; Otherwise, do not need to set up FA at described node.
5. method according to claim 4, is characterized in that, described in determine whether need set up FA at described node, comprise further:
If need to set up FA at described node, then hang up client layer first signaling message, and create the delivery port of FA needs; If do not need to set up FA at described node, then return LSP and set up failure response.
6. LSP set up a system, it is characterized in that, described system comprises: first node and tail node; Wherein,
Described first node, for calculating the PATH of process needed for LSP to be set up according to management plane request and network topology message, tissue carries the first signaling message of the Link Flags information after expansion, and described first signaling message hop-by-hop is sent to downstream node, until the tail node of LSP receives the first signaling message and the success of configuration transmission level-crossing; Wherein, the Link Flags information after described expansion comprises the type information of link heavy-route type information and link protection recovery combination;
Described tail node, for organizing the second signaling message hop-by-hop to send upstream node, until the first node of LSP receives the second signaling message and the success of configuration transmission level-crossing;
Wherein, link protection and link-recovery capabilities message that described LSP wishes is comprised in described first signaling message.
7. system according to claim 6, is characterized in that, described system also comprises:
Intermediate node, for receiving the signaling message of upstream node or the downstream node be adjacent, and sends to the downstream node or upstream node that are adjacent by described signaling message; And each intermediate node transmits level-crossing success according to described second signaling information configuration.
8. the system according to claim 6 or 7, is characterized in that, described first node, tail node and intermediate node include link judging unit and FA creates judging unit; Wherein,
Whether described link judging unit, exist the link satisfied condition for decision node, if there is the link satisfied condition, then node is applied on said link and reserved resource, and organizes the first signaling message to send to the downstream node be adjacent;
Described FA creates judging unit, needs to set up FA at node for determining whether.
9. system according to claim 8, it is characterized in that, described FA create judging unit specifically for: whether decision node is mixed node and whether there is FA, if described node is mixed node and there is not FA, then determines to need to set up FA at described node; Otherwise, determine not need to set up FA at described node.
10. system according to claim 9, is characterized in that, described FA create judging unit also for: determine to need when described node sets up FA, described node hangs up client layer first signaling message, and creates the delivery port that FA needs; Determine not need to set up FA at described node, described node returns LSP and sets up failure response.
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| CN105591861A (en) * | 2014-10-20 | 2016-05-18 | 中兴通讯股份有限公司 | Method and device for creating label switch path (LSP) |
| WO2018014274A1 (en) * | 2016-07-21 | 2018-01-25 | 华为技术有限公司 | Method for establishing path, and node |
| CN113162854B (en) * | 2017-01-27 | 2022-11-15 | 华为技术有限公司 | Path calculation method and device |
| CN108418753A (en) * | 2017-02-10 | 2018-08-17 | 中兴通讯股份有限公司 | The method for building up and device in path |
| CN112558504B (en) * | 2019-09-10 | 2021-11-02 | 中国电信股份有限公司 | Method, device and system for forwarding critical path information based on OSPF protocol |
| CN112203172B (en) * | 2020-10-09 | 2022-11-01 | 中国联合网络通信集团有限公司 | Special line opening method and device |
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