CN108886490B - Method and node for establishing path - Google Patents
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- CN108886490B CN108886490B CN201680083909.5A CN201680083909A CN108886490B CN 108886490 B CN108886490 B CN 108886490B CN 201680083909 A CN201680083909 A CN 201680083909A CN 108886490 B CN108886490 B CN 108886490B
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Abstract
The method comprises the steps that a first node determines that a first L SP to be established comprises an FA link, the FA L SP corresponding to the FA link is a second L SP, the first node sends a path updating message to at least one node on the second L SP, the path updating message is used for indicating and adjusting an attenuation value of a frequency spectrum occupied by the first L SP in the FA link, and the first node sends a path establishing message to at least one node on the first L SP, and the path establishing message is used for establishing the first L SP. path establishing method and the node of the embodiment of the invention, and the utilization rate of frequency spectrum resources can be improved.
Description
Technical Field
The present invention relates to the field of communications, and more particularly, to a method and node for establishing a path.
Background
With the development of data plane technology, Wavelength Division Multiplexing (WDM) transmission networks have been developed from the early stage to allocate/occupy only fixed spectrum resources, e.g. fixed at 50GHz or 100GHz, to the present stage to allocate variable size spectrum resources, e.g. integer multiples of 12.5GHz, e.g. 25GHz or 200 GHz. The latter is called an elastic grid (Flexible grid) WDM network.
The GMP L S (Generalized Multi-Protocol L abel Switching) Protocol suite may also be used to implement intelligent control of a flexible grid network.
At present, a Resource reservation protocol (RSVP-TE) extended by distributed Traffic Engineering is adopted to implement a path establishment method of a flexi-grid network, which includes: after receiving a single service request and calculating a path for the single service request, the first node sends path establishment messages hop by hop until the first node is the last node; the path establishment is completed when the head node receives the reply message, thereby serving to deliver the traffic data. The specific method for establishing the path is to establish the path from the source node to the destination node through a single RSVP-TE process. In order to ensure that the influence between paths is small, a part of spectrum resources must be taken out as a guard band when the paths are established, that is, service data is not transmitted, and the utilization rate of the spectrum resources is not high.
Disclosure of Invention
The embodiment of the invention provides a method and a node for establishing a path, which can improve the utilization rate of frequency spectrum resources.
In a first aspect, a method for establishing a path is provided, including:
the first node determines that a first label switched path L SP to be established comprises a forwarding neighbor FA link, and an FA L SP corresponding to the FA link is a second L SP;
the first node sending a path update message to at least one node on the second L SP, the path update message indicating an adjustment of an attenuation value of a spectrum occupied by the first L SP in the FA link;
the first node sends a path setup message to at least one node on the first L SP, the path setup message for setting up the first L SP.
The method for establishing the path of the embodiment of the invention utilizes the FA link to establish the path for the service request, thus, a smaller guard band is not needed or set when the service data is transmitted in the FA link, thereby improving the utilization rate of frequency spectrum resources.
In some possible implementations, a section of the spectrum resource may be represented in an (n, m) manner, where n represents a center frequency of the spectrum and m represents a width of the spectrum.
In some possible implementations, the first node receives a service request, the service request requesting establishment of the first L SP;
the first node obtains the first L SP according to the service request.
In some possible implementations, after receiving the service request, the first node may calculate a path that can carry the service according to the service request, so as to obtain the first L SP.
In some possible implementations, after receiving the service request, the first node may also request another device to calculate a path, for example, the another device may be a path calculation unit.
In some possible implementations, the first node receives a path establishment message sent by a fourth node, where the fourth node is a previous hop node of the first node on the first L SP, the path establishment message is used to establish the first L SP, and the second path establishment message carries spectrum information occupied by the first L SP;
the first node obtains the first L SP according to the path setup message.
In some possible implementations, the determining, by the first node, that the first label switched path L SP to be established includes a forwarding neighbor FA link includes:
the first node determines that the link between the first node and a second node is the FA link at the first L SP, wherein the second node is the next hop node of the first node at the first L SP.
In some possible implementations, the determining, by the first node, that the first label switched path L SP to be established includes a forwarding neighbor FA link, further includes:
the first node determines that the route of the first L SP includes the FA link and that the spectrum occupied by the first L SP is within the spectrum of the FA link.
In some possible implementations, the first node sending a path update message to at least one node on the second L SP, including:
the first node sends the path update message to a third node, wherein the third node is a next hop node of the first node on the second L SP, and the path update message carries spectrum information occupied by the first L SP.
In some possible implementations, the first node sending a path update message to at least one node on the second L SP, including:
the first node sends the path update message to each node except the first node on the second L SP, and the path update message carries the spectrum information occupied by the first L SP.
In some possible implementations, the first node sending a path setup message to at least one node on the first L SP, including:
the first node sends the path establishment message to the second node, and the first path establishment message carries spectrum information occupied by the first L SP.
In some possible implementations, the method further includes:
the first node receiving a path update reply message in response to the path update message;
the first node receives a path establishment reply message responding to the path establishment message;
the first node determines L that the setup of the first SP is complete based on the path update reply message and the first path setup reply message.
In some possible implementations, the method further includes:
the first node acquires the routing information and the occupied spectrum information of the first L SP according to the received service request or the path establishment message for establishing the first L SP.
In some possible implementations, the first node sends the path update message and the path setup message in parallel or in series.
In some possible implementations, the method further includes:
when the link between the first node and the second node is not the FA link, the first node sends a path establishment message to the second node, where the path establishment message is used to establish the first L SP, and the path establishment message carries spectrum information occupied by the first L SP.
In a second aspect, a method for establishing a path is provided, including:
a first node receives a path update message sent by a second node, wherein the path update message is used for indicating that an attenuation value of a frequency spectrum occupied by a first label switched path L SP in a forwarding neighbor FA link is adjusted, the first L SP includes the FA link, the first node is a node on a second L SP, and the second L SP is a FA L SP corresponding to the FA link;
the first node adjusts the attenuation value of the spectrum occupied by the first L SP in the FA link according to the path update message.
In some possible implementations, the path update message carries information of the spectrum occupied by the first L SP, the spectrum occupied by the first L SP being within the spectrum of the FA link;
the first node adjusting attenuation values of the spectrum occupied by the first L SP in the FA link according to the path update message, including:
the first node selects the spectrum occupied by the first L SP from the spectrum of the FA link, and adjusts the attenuation value of the spectrum occupied by the first L SP.
In some possible implementations, the adjusting, by the first node, the attenuation value of the spectrum occupied by the first L SP in the FA link according to the path update message includes:
the first node adjusts the attenuation value of the spectrum occupied by the first L SP from the maximum attenuation value to a nominal value.
In some possible implementations, the method further includes:
the first node sends a path update reply message to the second node in response to the path update message.
In a third aspect, a node is provided, which includes means for performing the first aspect or any possible implementation manner of the first aspect, or the second aspect or any possible implementation manner of the second aspect.
In a fourth aspect, a node is provided. The node includes a processor, a memory, and a communication interface. The processor is coupled to the memory and the communication interface. The memory is for storing instructions, the processor is for executing the instructions, and the communication interface is for communicating with other devices under control of the processor. The processor, when executing the instructions stored by the memory, causes the processor to perform the first aspect or any possible implementation of the first aspect, or the method of the second aspect or any possible implementation of the second aspect.
In a fifth aspect, a computer-readable medium is provided for storing a computer program comprising instructions for performing the first aspect or any possible implementation of the first aspect, or the method in the second aspect or any possible implementation of the second aspect.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1a and 1b are schematic diagrams of a network according to an embodiment of the invention.
Fig. 2a and 2b are schematic diagrams of a network according to another embodiment of the present invention.
Fig. 3 is a schematic flow chart diagram of a method of establishing a path in accordance with one embodiment of the present invention.
Fig. 4 is a schematic diagram of a frequency spectrum of an embodiment of the present invention.
Fig. 5 is a diagram of a path message according to an embodiment of the present invention.
Fig. 6 is a schematic flow chart diagram of a method of establishing a path according to another embodiment of the present invention.
Fig. 7a and 7b are schematic diagrams of networks according to yet another embodiment of the present invention.
Fig. 8 is a schematic flow chart diagram of a method of establishing a path according to yet another embodiment of the present invention.
Fig. 9 is a schematic flow chart diagram of a method of establishing a path according to yet another embodiment of the present invention.
Fig. 10 is a schematic block diagram of a node of one embodiment of the present invention.
Fig. 11 is a schematic block diagram of a node of another embodiment of the present invention.
Fig. 12 is a schematic structural diagram of a node according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the embodiment of the invention can be applied to various transmission networks.
The function of the transport network is to transport traffic for the users. The Transport Network may employ a variety of Transport technologies, such as Synchronous Digital Hierarchy (SDH), Optical Transport Network (OTN), WDM, and the like. Conventional transport networks contain only a management plane and a data plane. A control plane is introduced in a conventional transport network, and an optical network including the control plane is called an Automatic Switched Optical Network (ASON).
Fig. 1a shows a schematic diagram of a network to which the technical solution of the embodiment of the present invention can be applied. As shown in fig. 1a, the network may include a plurality of nodes 101 and 109 and links between the nodes.
In the embodiment of the present invention, the node may be a network device in the network, such as a router or a switch, but the present invention is not limited thereto.
It should be understood that fig. 1a is a simplified schematic diagram of an example, and that more nodes or other network devices may be included in the network, which are not shown in fig. 1 a.
When there is no forwarding neighbor (FA) link, the topology obtained by each node in fig. 1a is as shown in fig. 1 b. That is, when there are no FA links, the topology obtained by each node in fig. 1a is the topology formed by each node and physical links of the network. For example, in FIG. 1b, nodes are abstracted as a square grid and physical links are abstracted as a solid line.
The FA is essentially a Path, and when the Path is regarded as a link issued into a network, the issued link is called an FA link, and a label Switched Path (L abel Switched Path, L SP) corresponding to the link is called an FA L SP.
For example, as shown in fig. 2a, if a L SP has been established in the network, the path is node 101-node 102-node 103-node 104, and the FA link has been published, the topology obtained by each node in fig. 2a is shown in fig. 2b, that is, after a L SP is published as the FA link, the node is regarded as a point-to-point link in the network, that is, L SP is regarded as a node 101-node 104 link.
According to the technical scheme of the embodiment of the invention, the FA link is used for establishing the path for the service request, so that the utilization rate of the frequency spectrum resource is improved.
It should be understood that, in the various embodiments of the present invention, the terms "first", "second", "third", "fourth", "fifth", etc. are only used to distinguish different reference objects in the same embodiment, and are not limited otherwise.
For example, "first node," "second node," "third node," etc. simply refer to different nodes in the same embodiment. In addition, "first node", "second node", "third node", etc. in different embodiments are not necessarily the same, e.g., in one embodiment, the first node may be node 101, and in another embodiment, the first node may be node 102.
Fig. 3 shows a schematic flow chart of a method of establishing a path according to an embodiment of the invention. Each node in fig. 3 may be a node in the nodes 101 and 109 described above.
301, the first node determines that a first L SP to be established includes an FA link, and a FA L SP corresponding to the FA link is a second L SP.
In this embodiment of the present invention, the first L SP indicates the L SP to be established, that is, L SP. requested to be established by the service request is for different scenarios, and the first node may obtain the first L SP according to the service request from the client device or the path establishment message sent by the upstream node, so as to obtain the routing information and occupied spectrum information of the first L SP.
Alternatively, in one embodiment of the present invention,
the first node receiving a service request, the service request requesting establishment of the first L SP;
the first node obtains the first L SP according to the service request.
Specifically, in this embodiment, the first node is a node that receives a service request, for example, the first node may be the node 101. A client device, such as a data center or other device, sends a service request to a first node. The service request may carry a spectrum bandwidth size required by the service. In addition, the service request may further include other service-related information, for example, information of a source device and a target device of the service, and the like.
Optionally, after receiving the service request, the first node may calculate a path capable of carrying the service according to the service request, and the first L SP. path calculation method may adopt an existing path calculation algorithm.
For example, the other device may be a device that can calculate a Path, such as a Path Computation Element (PCE) or a centralized controller, and the other device calculates the first L SP and then sends the first L SP to the first node.
The first node can obtain the first L SP through its own path calculation or other device path calculation, that is, the first node is the first node of the first L SP, namely, the first node knows the routing information and occupied spectrum information of the first L SP.
In the embodiment of the present invention, the spectrum information occupied by the first L SP indicates which spectrum resource is occupied by the first L SP.
In the embodiment of the present invention, optionally, a section of spectrum resources is represented in a manner of (n, m), where n represents a center frequency of a spectrum, and m represents a width of the spectrum.
For example, as shown in fig. 4, if the spectrum resource of the optical fiber link divides the center frequency from 193.1THz and steps to two sides in units of 6.25GHz, the center frequency can be expressed as the following formula (1):
fn＝193.1+(n×6.25/1000)(THz) (1)
where n is an integer, for example: when n is 0, the center frequency f0 is 193.1 THz; when n is 7, the center frequency f7 is 193.14375 THz; when n is-8, the center frequency f-8 is 193.05 THz. m 12.5GHz is the actual spectral width. Of course, the unit spectrum width of 6.25GHz can be changed here, i.e. the step unit can be set according to the actual capability of the data plane node. For the segment of white space resources shown in fig. 4, n is 2, and m is 6, i.e. may be denoted as (2, 6).
Alternatively, in another embodiment of the present invention,
the first node receives a path establishment message sent by a fourth node, wherein the fourth node is a previous hop node of the first node on the first L SP, the path establishment message is used for establishing the first L SP, and the second path establishment message carries spectrum information occupied by the first L SP;
the first node obtains the first L SP according to the path setup message.
Specifically, in this embodiment, the first node is not the head node of the first L SP, and in this case, the first node acquires the first L SP according to the path establishment message sent by the fourth node, i.e., the previous-hop node of the first node on the first L SP, so as to acquire the routing information and occupied spectrum information of the first L SP.
After determining the L SP to be established, i.e., the first L SP, the first node determines whether an FA link is included in the first L SP.
Optionally, in one embodiment of the invention, the first node determines whether the link between the first node and the next hop node, denoted as the second node, at the first L SP is an FA link.
For example, in the scenario shown in fig. 2a and 2b, L SP between node 101 and node 104 calculated by node 101 may be node 101 and node 104, that is, the next hop of node 101 is node 104, and the link between node 101 and node 104 is an FA link.
Optionally, the first node of the FA link may also synchronize the relationship between the FA link and the FA L SP to other devices, such as a PCE, and the PCE determines whether the corresponding link is the FA link and informs the corresponding first node.
Optionally, in 301, in an embodiment of the present invention, the first node determines that the link between the first node and the second node is an FA link at the first L SP.
Optionally, in 301, in an embodiment of the present invention, the first node determines that the route of the first L SP includes an FA link, and the spectrum occupied by the first L SP is within the spectrum of the FA link.
It should be appreciated that the first node may determine that the FA link is included in the first L SP in 301 in other ways, which is not limited by the invention.
302, the first node sending a path update message to at least one node on the second L SP, the path update message indicating an adjustment of a attenuation value of the spectrum occupied by the first L SP in the FA link.
Specifically, when the first L SP includes an FA link, the first node initiates an update of the FA L SP corresponding to the FA link, i.e., the second L SP, the first node sends a path update message corresponding to the FA link to at least one node on the second L SP, and the node on the second L SP adjusts the attenuation value of the spectrum occupied by the first L SP according to the path update message.
Optionally, in an embodiment of the present invention, the path update message carries information of the spectrum occupied by the first L SP, and the spectrum occupied by the first L SP is within the spectrum range of the FA link.
Optionally, in an embodiment of the present invention, the first node sends the path update message to a third node, where the third node is a next-hop node of the first node on the second L SP, and the path update message carries spectrum information occupied by the first L SP.
Specifically, when the link between the first node and the second node is an FA link, the first node starts updating L SP corresponding to the FA link, namely, the second L SP, the first node sends a path update message to a third node, namely, the second L SP, the next hop node of the first node, and the third node adjusts the attenuation value of the frequency spectrum occupied by the first L SP according to the path update message.
For example, in the scenario shown in fig. 2a and 2b, if the first L SP is node 101-node 104, the link between node 101 and node 104 is an FA link, and the corresponding second L SP is node 101-node 102-node 103-node 104, the node 101 is to send a path update message to the next hop on the second L SP, i.e., node 102, and a path setup message to the next hop on the first L SP, i.e., node 104.
Optionally, in an embodiment of the present invention, the first node sends the path update message to each node except the first node on the second L SP, where the path update message carries spectrum information occupied by the first L SP.
Specifically, the first node may send the path update message to its next hop node on the second L SP when sending the path update message, and the next hop node may send the path update message to its next hop node, or the first node may send the path update message directly to each node on the second L SP except the first node.
303, the first node sending a path setup message to at least one node on the first L SP, the path setup message for setting up the first L SP.
Specifically, when the first L SP includes an FA link, the first node sends a path establishment message corresponding to the first L SP to the node on the first L SP in addition to starting the update of the FA L SP corresponding to the FA link, that is, the second L SP.
Optionally, in an embodiment of the present invention, the first node sends the path setup message to the second node, where the first path setup message carries spectrum information occupied by the first L SP.
Specifically, when the link between the first node and the second node is an FA link, the first node sends a path establishment message to the second node, and the second node establishes the first L SP according to the path establishment message.
Optionally, the first node sends the path update message and the path setup message in parallel or in series. That is, the first node may simultaneously transmit the path update message and transmit the path setup message; or the path updating message can be sent first, and the path establishing message can be sent after the reply message is received.
The path update message and the path setup message may optionally be defined based on the RSVP-TE protocol and may be extended to carry spectrum information, for example, the spectrum information may be carried by an extension L SP _ REQUIRED _ ATTRIBUTES object, for example, the format shown in fig. 5 may be employed fig. 5 shows a schematic diagram of a path message of an embodiment of the invention, in fig. 5, c.s. denotes a channel interval granularity field, n denotes a field of a center frequency, and m denotes a width field of a spectrum.
304, the node at the second L SP adjusts the attenuation value of the spectrum occupied by the first L SP in the FA link according to the path update message.
Specifically, the node receiving the path update message parses the spectrum occupied by the first L SP, i.e., the spectrum segment that needs to be adjusted, e.g., (n, m), according to the path update message, and turns on the filter of the FA link and adjusts the attenuation value of the spectrum segment.
Optionally, the node selects the spectrum occupied by the first L SP from the spectrum of the FA link, and adjusts the attenuation value of the spectrum occupied by the first L SP.
Optionally, the node adjusts the attenuation value of the spectrum occupied by the first L SP from a maximum attenuation value to a nominal value.
The invention is not limited by the specific adjustment, and the purpose of the adjustment is to enable the Optical performance of the current path to be suitable for service transmission, and enable the existing service not to be affected by the newly-built L SP to cause the abnormal operation.
Optionally, in an embodiment of the present invention, when the node receiving the path update message is not the end node of the second L SP, the node sends a path update message to a next-hop node of the node on the second L SP, where the path update message carries spectrum information occupied by the first L SP, the next-hop node may perform similar processing as the node, and finally sends a path update reply message to the upstream in sequence after the end node of the second L SP finishes adjusting the spectrum occupied by the first L SP, and finally sends a path update reply message to the first node.
Optionally, in an embodiment of the present invention, if the first node directly sends the path update message to each node on the second L SP, each node on the second L SP may directly send the path update reply message to the first node after adjusting the spectrum occupied by the first L SP.
It should be understood that the content carried by the path update message of each downstream node may be the same or different, and the attenuation nominal value adjusted by each downstream node may be the same or different, which is not limited in the present invention.
The first node receives 305 a path update reply message in response to the path update message.
The first node receives 306 a path setup reply message in response to the path setup message.
The node receiving the path establishment message can establish corresponding cross connection according to the path establishment message and send a path establishment reply message to the first node.
307, the first node determines L that the SP establishment is complete based on the path update reply message and the path establishment reply message.
Specifically, when the first node is the head node of the first L SP, the first node determines that the establishment of the first L SP is completed and then starts to deliver the service data after receiving a path update reply message and a path establishment reply message, and when the first node is not the head node of the first L SP, the first node determines that the establishment of the first L SP is completed and sends a path establishment reply message to an upstream node, so that the head node of the first L SP determines that the establishment of the first L SP is completed and then starts to deliver the service data.
Optionally, in an embodiment of the present invention, when the link between the first node and the second node is not an FA link, the first node sends a path establishment message to the second node, where the path establishment message is used to establish the first L SP, and the path establishment message carries spectrum information occupied by the first L SP.
Specifically, when the link between the first node and the second node is not an FA link, the first node sends a path establishment message to the second node, and the second node obtains the first L SP according to the path establishment message, so that operations similar to those of the first node may be performed, which is not described herein again for brevity.
The method for establishing the path of the embodiment of the invention utilizes the FA link to establish the path for the service request, thus, a smaller guard band is not needed or set when the service data is transmitted in the FA link, thereby improving the utilization rate of frequency spectrum resources.
The embodiments of the present invention will be described in detail below with reference to specific examples. It should be noted that these examples are only for helping those skilled in the art to better understand the embodiments of the present invention, and do not limit the scope of the embodiments of the present invention.
Taking the scenario shown in fig. 2a and 2b as an example, the following information is assumed:
the frequency spectrum bandwidth of each link in the network is consistent and is 500 GHz; the protocols used in the network are RSVP-TE signaling protocol and OSPF-TE routing protocol;
an L SP (L SP ID is L SP1) is already established in the network, the path is node 101-node 102-node 103-node 104, the bandwidth size is 200GHz, and the FA link is released, and the frequency spectrum range of a wave band occupied by the 200GHz is (193.1THz, 193.3 THz).
Fig. 6 is a flow chart of one embodiment in the scenario shown in fig. 2a and 2 b.
Assume that the path established by the service request is L SP2, and the bandwidth size of the path is carried in the service request, which is assumed to be 37.5GHz in this embodiment.
602, node 101 determines L SP 2.
The node 101 calculates L SP2 as node 101-node 104 according to the service request, and the used specific spectrum resource information is (3, 3).
603, node 101 determines L whether the link between node 101 and the next hop in SP2 is an FA link.
In this embodiment, a link between the node 101 and the next hop is the node 101-node 104, and the node 101 may determine that the node 101-node 104 is an FA link according to local information, for example, a relationship between the FA link and the FA L SP, and may find that the FA L SP corresponding to the FA link is L sp1.
604, the node 101 sends L a path update message to the next hop of SP 1.
L SP1, node 102, node 101 carries spectrum information (3,3) in the path update message to indicate that the spectrum segment (3,3) needs to be adjusted, the spectrum information is used for L SP1 intermediate nodes to make corresponding adjustments to ensure that the optical layer damage of the L SP2 path can be within a reasonable range, i.e., L SP2 can be successfully established.
605, node 101 sends L a path setup message to the next hop of SP 2.
L SP2 the next hop, node 104, the spectrum information used by L SP2, i.e., (3,3), is carried in the path setup message.
606, the node 102 performs spectral modification.
The node 102 receives the path update message, analyzes the spectrum segment needing to be adjusted to be (3,3), and the node 102 adjusts the attenuation value of the attenuator of the spectrum segment, in this embodiment, the attenuation value is adjusted from the maximum attenuation value to the nominal value, and the adjustment can be performed according to the OSNR degradation flatness fed back downstream.
607, node 102 sends a path update message to the next hop.
Since node 102 is an intermediate node, it also needs to pass the path update message to the downstream node, i.e. node 102 sends the path update message to node 103.
The node 103 performs spectrum adjustment 608.
This step is similar to 606 and will not be described further herein.
609, node 103 sends a path update message to the next hop.
This step is similar to 607 and will not be described further herein.
The end node 104 receives the path update message and the path setup message from the node 101, and performs a spectrum adjustment similar to step 606.
611, the node 104 sends a path update reply message and a path setup reply message.
The path update reply message may be communicated to node 101 through the upstream node at L SP1, while the path setup reply message may be sent directly to node 101.
612, node 101 determines L that SP2 establishment is complete.
After receiving the path update reply message sent by the node 102 and the path establishment reply message sent by the node 104, the head node 101 determines L that the SP2 establishment is completed, and starts to transmit service data.
A scene diagram of another embodiment of the present invention may be seen in fig. 7a and 7 b.
As shown in fig. 7a, if an L SP has been established in the network, the path is node 102-node 103-node 104, and the path has been published as FA link, then the topology obtained by each node in fig. 7a is as shown in fig. 7 b.
In the scenarios shown in fig. 7a and 7b, the following information is assumed:
the frequency spectrum bandwidth of each link in the network is consistent and is 500 GHz; the protocols used in the network are RSVP-TE signaling protocol and OSPF-TE routing protocol;
an L SP (L SP ID is L SP1) is already established in the network, the path is from node 102 to node 103 to node 104, the bandwidth size is 100GHz, and the FA link is released, and the frequency spectrum range of a wave band occupied by the 100GHz is (193.1THz, 193.2 THz).
Fig. 8 is a flow chart of one embodiment in the scenario illustrated in fig. 7a and 7 b.
Assume that the path established by the service request is L SP2, and the bandwidth size is carried in the service request, which is assumed to be 75GHz in this embodiment.
802, node 101 determines L SP 2.
The node 101 calculates L SP2 as node 101-node 102-node 104 according to the service request, and the used specific spectrum resource information is (6, 6).
803, node 101 determines L whether the link between node 101 and the next hop in SP2 is an FA link.
In this embodiment, the link between the node 101 and the next hop is the node 101-node 102, and the node 101 may determine that the node 101-node 102 is not an FA link according to the local information.
804, the node 101 sends L a path setup message to the next hop of SP 2.
805, the node 102 determines L whether the link between the node 102 and the next hop in SP2 is an FA link.
The node 102 receives the path establishment message and analyzes the path establishment message to be a message for establishing L SP2, the node 102 is not a last node, and therefore, whether a link between the node and a next hop is an FA link needs to be judged, in this embodiment, the link between the node 102 and the next hop is the node 102-node 104, the node 102 can judge that the node 102-node 104 is an FA link according to local information, and an FA L SP corresponding to the FA link is L SP1, in addition, the node 102 can determine L SP2 that the occupied spectrum is within the spectrum range of the FA link.
806, the node 102 sends L a path update message to the next hop of SP 1.
L SP1, node 103, node 102 carries spectrum information (6,6) in the path update message to indicate that the spectrum segment (6,6) needs to be adjusted, the spectrum information is used for L SP1 intermediate nodes to make corresponding adjustments to ensure that the optical layer damage of the L SP2 path can be within a reasonable range, i.e., L SP2 can be successfully established.
807, node 102 sends L a path setup message to the next hop of SP 2.
L SP2 the next hop, node 104, the spectrum information used by L SP2, i.e., (6,6), is carried in the path setup message.
808, the node 103 performs spectral adjustment.
The node 103 receives the path update message, analyzes the spectrum segment needing to be adjusted to be (6,6), and the node 103 adjusts the attenuation value of the attenuator of the spectrum segment, in the embodiment, the attenuation value is adjusted from the maximum attenuation value to the nominal value, and the adjustment can be performed according to the OSNR degradation flatness fed back downstream.
809, the node 103 sends a path update message to the next hop.
Since node 103 is an intermediate node, it also needs to pass the path update message to downstream nodes, i.e. node 103 sends the path update message to node 104.
The end node 104 receives the path update message and the path setup message from the node 102 and performs a spectrum adjustment similar to step 808.
811, the node 104 sends a path update reply message and a path setup reply message.
The path update reply message may be passed to node 102 and the path setup reply message may be sent directly to node 102.
812, the node 102 sends a path setup reply message to the upstream node.
After receiving the path update reply message sent by the node 103 and the path establishment reply message sent by the node 104, the node 102 determines L that the SP2 establishment is completed, and because the node is not the first node, the node needs to send a path establishment reply message to an upstream node, that is, the node 102 sends a path establishment reply message to the node 101.
Alternatively, if L SP2 fails to establish, for example, a new service cannot be established without affecting other existing services, node 102 receives the path update failure message sent by node 103, and may send a path establishment failure message to an upstream node, that is, node 101.
813, node 101 determines L that SP2 setup is complete.
After receiving the path establishment reply message sent by the node 102, the head node 101 determines L that the SP2 establishment is completed, and starts to transmit service data.
Fig. 6 and 8 show the parallel processing procedures of two L SP flows (i.e., L SP1 and L SP2), which are applicable to the existing network services with better performance, for example, the Bit Error Rate (BER) performance is higher than the threshold value.
When the BER value of the service is lower than the threshold, a serial mode can be used.
Taking the scenario shown in fig. 7a and 7b as an example, assume the following information:
assuming that the frequency spectrum bandwidth of each link in the network is consistent and is 500 GHz; the protocols used in the network are RSVP-TE signaling protocol and OSPF-TE routing protocol;
an L SP (L SP ID L SP1) is already established in the network, namely a node 102, a node 103 and a node 104, the bandwidth size is 100GHz, and the FA link is already published;
the network has another L SP2 (node 102-node 104), which uses L SP1, the bandwidth is 25GHz, the occupied spectrum is (2, 2), and the current actual BER threshold is lower than the set threshold value in the spectrum range of the FA link.
Fig. 9 is a flowchart of this embodiment.
901, node 101 receives a service request from a client device.
Assume that the path established by the service request is L SP3, and the bandwidth size is carried in the service request, which is assumed to be 75GHz in this embodiment.
902, node 101 determines L SP 3.
The node 101 calculates L SP3 as node 101-node 102-node 104 according to the service request, and the used spectrum resource information is (10, 6).
903, node 101 determines L whether the link between node 101 and the next hop in SP3 is an FA link.
In this embodiment, the link between the node 101 and the next hop is the node 101-node 102, and the node 101 may determine that the node 101-node 102 is not an FA link according to the local information.
904, node 101 sends L a path setup message to the next hop of SP 3.
905, the node 102 determines L whether the link between the node 102 and the next hop in SP3 is an FA link.
The node 102 receives the path establishment message and analyzes the path establishment message to be a message for establishing L SP3, the node 102 is not a last node, and therefore, whether a link between the node and a next hop is an FA link needs to be judged, in this embodiment, the link between the node 102 and the next hop is the node 102-node 104, the node 102 can judge that the node 102-node 104 is an FA link according to local information, and an FA L SP corresponding to the FA link is L SP1, in addition, the node 102 can determine L SP3 that the occupied spectrum is within the spectrum range of the FA link.
906, the node 102 determines L that the BER threshold of SP2 is below the set value and then performs step 907.
907, node 102 sends L a path update message to the next hop of SP 1.
L SP1, node 103, node 102 carries spectrum information (10,6) in the path update message to indicate that the spectrum segment (10,6) needs to be adjusted, the spectrum information is used for L SP1 intermediate nodes to make corresponding adjustments to ensure that the optical layer damage of the L SP3 path can be within a reasonable range, i.e., L SP3 can be successfully established.
908, the node 103 performs spectrum adjustment.
The node 103 receives the path update message, and resolves the spectrum segment to be adjusted to (10, 6). The node 103 adjusts the attenuation value of the attenuator for the portion of spectrum.
The node 103 sends 909 a path update message to the next hop.
Since node 103 is an intermediate node, it also needs to pass the path update message to downstream nodes, i.e. node 103 sends the path update message to node 104.
At 910, the node 104 performs spectral modification.
The end node 104 receives the path update message and performs a spectral adjustment similar to step 908.
911, node 104 sends a path update reply message to the upstream node.
The path update reply message may be communicated to node 102 through an upstream node.
912, node 102 sends L a path setup message to the next hop of SP 3.
After receiving the path update reply message from the downstream node 103, the node 102 sends a path setup message to L SP3, node 104, which carries the spectrum information used by L SP3, node (10, 6).
913, the node 104 sends a path setup reply message to the node 102.
The end node 104 receives L SP 3's path setup message, establishes cross-connect, and then returns a path setup reply message indicating that the path setup was successful.
The node 102 sends 914 a path setup reply message to the upstream node.
After receiving the path establishment reply message sent by the node 104, the node 102 needs to send the path establishment reply message to an upstream node because the node is not the head node, that is, the node 102 sends the path establishment reply message to the node 101.
915, the node 101 determines L that the SP3 establishment is complete.
After receiving the path establishment reply message sent by the node 102, the head node 101 determines L that the SP3 establishment is completed, and starts to transmit service data.
In the scheme, the success rate of path establishment can be improved by adopting a serial mode when the BER value of the existing service is lower than a threshold.
It should be understood that, in various embodiments of the present invention, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.
Having described the method of establishing a path according to an embodiment of the present invention in detail above, a node according to an embodiment of the present invention will be described below.
Fig. 10 shows a schematic block diagram of a node 1000 according to an embodiment of the invention.
It is to be understood that the node 1000 may correspond to a node in the embodiments of the methods and may have any of the functions of a node in a method.
As shown in fig. 10, the node 1000 includes:
a processing module 1010, configured to determine that a first label switched path L SP to be established includes a forwarding neighbor FA link, where an FA L SP corresponding to the FA link is a second L SP;
a transceiving module 1020 configured to send a path update message to at least one node on the second L SP, the path update message indicating an adjustment of a attenuation value of the spectrum occupied by the first L SP in the FA link, and send a path setup message to at least one node on the first L SP, the path setup message being used to setup the first L SP.
The node of the embodiment of the invention establishes the path for the service request by utilizing the FA link, so that a smaller guard band is not needed or set when the service data is transmitted in the FA link, thereby improving the utilization rate of frequency spectrum resources.
Optionally, in an embodiment of the present invention, the processing module 1010 is specifically configured to determine that, at the first L SP, a link between the node and a second node is the FA link, where the second node is a next-hop node of the node on the first L SP.
Optionally, in an embodiment of the present invention, the processing module 1010 is further configured to determine that the route of the first L SP includes the FA link, and the spectrum occupied by the first L SP is within the spectrum range of the FA link.
Optionally, in an embodiment of the present invention, the transceiver module 1020 is specifically configured to send the path update message to a third node, where the third node is a next-hop node of the node on the second L SP, and the path update message carries spectrum information occupied by the first L SP.
Optionally, in an embodiment of the present invention, the transceiver module 1020 is specifically configured to send the path update message to each node except the node on the second L SP, where the path update message carries spectrum information occupied by the first L SP.
Optionally, in an embodiment of the present invention, the transceiver module 1020 is specifically configured to send the path setup message to the second node, where the first path setup message carries spectrum information occupied by the first L SP.
Optionally, in an embodiment of the present invention, the transceiver module 1020 is further configured to receive a path update reply message responding to the path update message; receiving a path establishment reply message responding to the path establishment message;
the processing module 1010 is further configured to determine L that the setup of the first SP is complete according to the path update reply message and the first path setup reply message.
Optionally, in an embodiment of the present invention, the processing module 1010 is further configured to obtain the routing information and the occupied spectrum information of the first L SP according to the received service request or the path establishment message for establishing the first L SP.
Fig. 11 shows a schematic block diagram of a node 1100 according to another embodiment of the present invention.
It is to be understood that the node 1100 may correspond to a node in each method embodiment and may have any of the functions of a node in a method.
As shown in fig. 11, the node 1100 includes:
a transceiving module 1110, configured to receive a path update message sent by a second node, where the path update message is used to instruct to adjust an attenuation value of a spectrum occupied by a first label switched path L SP in a forwarding neighbor FA link, where the first L SP includes the FA link, the node is a node on a second L SP, and the second L SP is a FA L SP corresponding to the FA link;
a processing module 1120, configured to adjust an attenuation value of a spectrum occupied by the first L SP in the FA link according to the path update message.
Optionally, in an embodiment of the present invention, the path update message carries information of the spectrum occupied by the first L SP, and the spectrum occupied by the first L SP is within the spectrum range of the FA link;
the processing module 1120 is specifically configured to select a spectrum occupied by the first L SP from the spectrum of the FA link, and adjust an attenuation value of the spectrum occupied by the first L SP.
Optionally, in an embodiment of the present invention, the processing module 1120 is specifically configured to adjust the attenuation value of the frequency spectrum occupied by the first L SP from the maximum attenuation value to a nominal value.
Optionally, in an embodiment of the present invention, the transceiver module 1110 is further configured to send a path update reply message to the second node in response to the path update message.
Fig. 12 shows a node structure provided by a further embodiment of the invention, comprising at least one processor 1202 (e.g.cpu), at least one network interface 1205 or other communication interface, a memory 1206, and at least one communication bus 1203 for enabling connectivity communications between these components. The processor 1202 is operable to execute executable modules, such as computer programs, stored in the memory 1206. The memory 1206 may comprise a Random Access Memory (RAM) and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory. A communication connection with at least one other device is made through at least one network interface 1205 (which may be wired or wireless).
In some embodiments, the memory 1206 stores the program 12061, and the processor 1202 executes the program 12061 for performing the methods of the embodiments of the invention described above.
The embodiment of the invention also provides a network, which can comprise the nodes in the embodiments.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (22)
1. A method of establishing a path, comprising:
the first node determines that a first label switched path L SP to be established comprises a forwarding neighbor FA link, and an FA L SP corresponding to the FA link is a second L SP;
the first node sends a path update message to the next hop node of the first node on the second L SP, or the first node sends a path update message to each node on the second L SP except the first node, the path update message is used for instructing the nodes on the second L SP to adjust the attenuation value of the frequency spectrum occupied by the first L SP in the FA link according to the path update message;
the first node sends a path setup message to a next hop node on the first L SP, the path setup message for setting up the first L SP.
2. The method of claim 1, wherein the first node determining that the first label switched path L SP to be established includes a forwarding neighbor FA link, comprises:
the first node determines to be on the first L SP, and the link between the first node and a second node is the FA link, wherein the second node is a next hop node of the first node on the first L SP.
3. The method of claim 2, wherein the first node determines that the first label switched path L SP to be established includes a forwarding neighbor FA link, further comprising:
the first node determines that the route of the first L SP includes the FA link and that the spectrum occupied by the first L SP is within the spectrum of the FA link.
4. The method according to any of claims 1 to 3, wherein the path update message carries spectrum information occupied by the first L SP.
5. The method according to any of claims 1 to 3, wherein the first node sending a path setup message to a next hop node on the first L SP, comprising:
and the first node sends the path establishment message to a second node, wherein the path establishment message carries spectrum information occupied by the first L SP.
6. The method according to any one of claims 1 to 3, further comprising:
the first node receives a path update reply message responding to the path update message;
the first node receives a path establishment reply message responding to the path establishment message;
and the first node determines that the establishment of the first L SP is completed according to the path updating reply message and the first path establishing reply message.
7. The method according to any one of claims 1 to 3, further comprising:
and the first node acquires the routing information and the occupied frequency spectrum information of the first L SP according to the received service request or the path establishment message for establishing the first L SP.
8. A method of establishing a path, comprising:
a first node receives a path update message sent by a second node, wherein the path update message is used for indicating an attenuation value of a frequency spectrum occupied by a first label switched path L SP in a forwarding neighbor FA link, the first L SP includes the FA link, the first node is a node on a second L SP, and the second L SP is an FA L SP corresponding to the FA link;
the first node adjusts attenuation values of a spectrum occupied by the first L SP in the FA link according to the path update message.
9. The method of claim 8, wherein the path update message carries information of the spectrum occupied by the first L SP, wherein the spectrum occupied by the first L SP is within the spectrum of the FA link;
the first node adjusting attenuation values of a spectrum occupied by the first L SP in the FA link according to the path update message, including:
the first node selects the frequency spectrum occupied by the first L SP from the frequency spectrum of the FA link, and adjusts the attenuation value of the frequency spectrum occupied by the first L SP.
10. The method according to claim 8 or 9, wherein the first node adjusting the attenuation value of the spectrum occupied by the first L SP in the FA link according to the path update message comprises:
the first node adjusts the attenuation value of the spectrum occupied by the first L SP from a maximum attenuation value to a nominal value.
11. The method according to claim 8 or 9, characterized in that the method further comprises:
the first node sends a path update reply message to the second node in response to the path update message.
12. A first node, comprising:
a processing module, configured to determine that a first label switched path L SP to be established includes a forwarding neighbor FA link, where an FA L SP corresponding to the FA link is a second L SP;
a transceiver module, configured to send a path update message to a next-hop node of the first node on the second L SP, or, the transceiver module is configured to send a path update message to each node on the second L SP except the first node, where the path update message is used to instruct the node on the second L SP to adjust a attenuation value of a spectrum occupied by the first L SP in the FA link according to the path update message, and send a path setup message to the next-hop node on the first L SP, where the path setup message is used to set up the first L SP.
13. The first node of claim 12, wherein the processing module is further configured to determine that a link between the first node and a second node on the first L SP is the FA link, wherein the second node is a next hop node of the first node on the first L SP.
14. The first node of claim 13, wherein the processing module is further configured to determine that the route of the first L SP includes the FA link and that the spectrum occupied by the first L SP is within the spectrum of the FA link.
15. The first node according to any of claims 12-14, wherein the path update message carries spectrum information occupied by the first L SP.
16. The first node according to any one of claims 12 to 14, wherein the transceiver module is specifically configured to send the path setup message to a second node, where the path setup message carries spectrum information occupied by the first L SP.
17. The first node according to any of claims 12 to 14, wherein the transceiver module is further configured to receive a path update reply message in response to the path update message; receiving a path establishment reply message responding to the path establishment message;
the processing module is further configured to determine that establishment of the first L SP is complete according to the path update reply message and the first path establishment reply message.
18. The first node of any of claims 12 to 14, wherein the processing module is further configured to obtain routing information and occupied spectrum information of the first L SP according to a received service request or a path setup message for setting up the first L SP.
19. A first node, comprising:
a transceiver module, configured to receive a path update message sent by a second node, where the path update message is used to indicate an attenuation value for adjusting a spectrum occupied by a first label switched path L SP in a forwarding neighbor FA link, where the first L SP includes the FA link, the node is a node on a second L SP, and the second L SP is a FA L SP corresponding to the FA link;
a processing module, configured to adjust an attenuation value of a spectrum occupied by the first L SP in the FA link according to the path update message.
20. The first node of claim 19, wherein the path update message carries information of the spectrum occupied by the first L SP, the spectrum occupied by the first L SP being within the spectrum of the FA link;
the processing module is specifically configured to select a spectrum occupied by the first L SP from the spectrum of the FA link, and adjust an attenuation value of the spectrum occupied by the first L SP.
21. The first node according to claim 19 or 20, wherein the processing module is specifically configured to adjust the attenuation value of the frequency spectrum occupied by the first L SP from a maximum attenuation value to a nominal value.
22. The first node according to claim 19 or 20, wherein the transceiver module is further configured to send a path update reply message to the second node in response to the path update message.
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| PCT/CN2016/090783 WO2018014274A1 (en) | 2016-07-21 | 2016-07-21 | Method for establishing path, and node |
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| CN108886490A (en) | 2018-11-23 |
| WO2018014274A1 (en) | 2018-01-25 |
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