CN102769605A - A method and device for determining a relay circuit - Google Patents

Abstract

The invention provides a method and a device for determining a relay circuit, wherein the method specifically comprises determining a circuit among circuits satisfying demands of an IP (internet protocol) network on flow and flow direction as a transmission relay circuit in combination data transmission delay of a circuit in a transmission network, wherein the data transmission delay in the circuit determined as the transmission relay circuit meets a preset condition, so that the data transmission delay of the determined transmission relay circuit is relatively short. Moreover, data transmission speed of the IP network is increased when data transmission is executed by the IP network in the determined transmission relay circuit.

Description

A method and device for determining a relay circuit

technical field

The present invention relates to the technical field of communications, in particular to a method and device for determining a relay circuit.

Background technique

In the current Internet Protocol (IP, Internet Protocol) network, most of them adopt the networking mode of IP over SDH or IP over DWDM, and use Synchronous Digital Hierarchy (SDH, Synchronous Digital Hierarchy) or dense wavelength division multiplexing ( DWDM, Dense Wavelength Division Multiplexing) provides relay circuits for IP networks. At present, the IP network and the transport network are planned, constructed and developed independently of each other. The IP network and the transport network do not understand each other's network structure, but only a simple superposition relationship. Therefore, when providing relay circuits for the IP network, the transport The network provides relay circuits for the IP network according to the traffic and flow requirements of the IP network.

The current method of providing relay circuits for IP networks has the following problems:

The IP network lacks knowledge of the network structure of the transport network, and cannot set up relay circuits based on the routing conditions of the transport network and the structure of the transmission system. There may be unreasonable routing, so that when the IP network uses the relay circuit for data transmission, the data transmission delay is long, which cannot meet the requirements of the IP network.

Contents of the invention

Embodiments of the present invention provide a method and device for determining a relay circuit, which are used to solve the problem in the prior art that the data transmission delay of the relay circuit provided by the transport network for the IP network is relatively long.

A method of determining a trunk circuit, the method comprising:

Determining a data sending node and a data receiving node of the Internet Protocol IP network, and a first data transmission flow required for data transmission from the data sending node to the data receiving node;

Measuring the data transmission delay for circuits in the transmission network to transmit data from the data sending node to the data receiving node, where the circuits in the transmission network support transmission of data from the data sending node to the data receiving node can The second data transmission traffic carried is not less than the first data transmission traffic;

Determining the circuits in the transmission network whose data transmission delay meets the set condition;

The determined circuit is used as a transmission relay circuit for transmitting data from the data sending node to the data receiving node.

A device for determining a relay circuit, the device comprising:

The first information determination module is used to determine the data sending node and the data receiving node of the Internet protocol IP network, and the first data transmission flow required for data transmission from the data sending node to the data receiving node;

The second information determination module is used to measure the data transmission delay of the circuit in the transmission network from the data sending node to the data receiving node, and the circuit in the transmission network supports the transmission from the data sending node to the data receiving node. A circuit in the transmission network whose second data transmission traffic that the data receiving node can carry when transmitting data is not less than the first data transmission traffic, and that determines that the data transmission delay satisfies a set condition;

A transmission relay circuit determination module, configured to use the determined circuit as a transmission relay circuit for transmitting data from the data sending node to the data receiving node.

The solution provided by the embodiment of the present invention is not to determine the relay circuit only according to the traffic and flow direction requirements of the IP network, but to combine the data transmission delay of the circuit in the transmission network, and to meet the traffic and flow direction requirements of the IP network. , the circuit whose data transmission delay meets the set condition is determined as a transmission relay circuit, so that the data transmission delay of the determined transmission relay circuit can be shortened, and the IP network uses the determined transmission relay circuit During data transmission, the speed of IP network data transmission can be improved.

Description of drawings

FIG. 1 is a schematic flowchart of a method for determining a relay circuit provided by Embodiment 1 of the present invention;

FIG. 2 is a schematic flowchart of steps for determining a circuit in a transmission network provided by Embodiment 1 of the present invention;

FIG. 3 is a schematic flowchart of steps for updating a redundant relay circuit provided by Embodiment 1 of the present invention;

FIG. 4 is a schematic structural diagram of a device for determining a relay circuit provided in Embodiment 2 of the present invention;

FIG. 5 is a functional block diagram of an apparatus for determining a relay circuit provided in Embodiment 2 of the present invention;

FIG. 6 is a schematic structural diagram of a system for determining a relay circuit provided by Embodiment 2 of the present invention.

Detailed ways

Aiming at the problem that the relay circuit provided by the existing transport network for the IP network has a long data transmission delay and cannot meet the needs of the IP network, in the solution provided by the present invention, the flow and direction of the IP network and the data of the transport network are combined The transmission delay is used to determine the transmission relay circuit, thereby solving the problems existing in the prior art.

The technical solutions of the present invention will be described below in conjunction with the accompanying drawings and various embodiments.

Embodiment one,

Embodiment 1 of the present invention provides a method for determining a relay circuit. The step flow of the method is shown in FIG. 1 , specifically including:

Step 101, determine the traffic and flow direction requirements of the IP network.

This step specifically includes: determining a data sending node and a data receiving node of the IP network, and a first data transmission flow required for data transmission from the data sending node to the data receiving node.

Step 102, determine the circuits in the transport network.

In the method for determining a relay circuit provided in Embodiment 1, the information of the IP network and the transport network is combined to determine the relay circuit provided by the transport network for the IP network.

The circuit determined in this step needs to meet the following conditions:

The circuit supports data transmission from the data sending node to the data receiving node, the second data transmission traffic that can be carried is not less than the first data transmission traffic, and is transmitted from the data sending node to the data receiving node The data transmission delay of the data meets the set condition.

Wherein, the data transmission delay meeting the set condition may mean that the measured data transmission delay meets the set condition, or it may mean that parameters related to the data transmission delay meet the set condition, such as the circuit can carry A ratio of the second data transmission flow rate to the data transmission delay is greater than a set value.

Specifically, the ratio of the second data transmission traffic to the data transmission delay may be determined by the following method:

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; /</span>\frac{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span>$

in,

W _k represents the ratio of the second data transmission flow of the k-th circuit in the transport network to the data transmission delay of the k-th circuit, the minimum value of k is 1, and the maximum value is the one that satisfies the following conditions in the transport network Number of circuits:

Supporting data transmission from the data sending node to the data receiving node and the second data transmission traffic that can be carried is not less than the first data transmission traffic;

i and j respectively represent a transmission node, and i is a data sending node, and j is a data receiving node;

T _{i, j} represents the average value of the point-to-point traffic of the IP network from the transmission node i to the transmission node j within a measurement period;

T _i represents the total data flow of IP network transmission node i within a measurement period;

D _{i, k, j} represent the data transmission delay of the transmission network from the transmission node i to the transmission node j via the kth circuit;

D represents the maximum data transmission delay of the transport network.

Specifically, the steps for determining the circuits in the transmission network may be shown in Figure 2, including the following steps:

Step 1021. Determine each circuit in the transport network that supports data transmission from the data sending node to the data receiving node and that can carry the second data transmission traffic not less than the first data transmission traffic.

Step 1022, determine the data transmission delay of each circuit determined in step 1021.

In this step, the data transmission time delay generated when data is transmitted from the data sending node to the data receiving node through each of the determined circuits may be respectively determined.

Step 1023, selecting a circuit whose data transmission time delay satisfies the set condition.

Preferably, the setting condition may be the minimum data transmission delay. Then in this step, the circuit whose data transmission delay satisfies the set condition may be selected according to the smallest ratio of the second data transmission flow rate to the data transmission delay.

Step 103, using the determined circuit as a transmission relay circuit for transmitting data from the data sending node to the data receiving node.

After using the determined circuit as a transmission relay circuit, when transmitting data from the data sending node to the data receiving node, the determined circuit with a smaller data transmission delay can be used to transmit data, thereby improving the IP The speed of network transmission data and optimize the performance of IP network.

In the prior art, in order to improve the reliability of the IP network, the IP network will set at least one redundant relay circuit with a different relay direction from the relay circuit that has been set, so that the When the circuit fails to work normally, the redundant relay circuit can be used to continue to work. However, it is likely that part or all of the redundant relay circuit is located in the same transmission route or the same physical device of the transport network as the configured relay circuit.

For example, the transport network provides the IP network with a relay circuit B and a redundant relay circuit B' according to the traffic and flow direction requirements of the IP network, and the relay circuit B and the redundant relay circuit B' The transmission routes may be partially or completely identical, such as the part or all of the transmission routes passing through the optical cable 4 and the optical cable 5, so when the optical cable 4 or/and the optical cable 5 fail, the relay circuit B and the redundant relay circuit Neither of B' can work normally; or the optical cables or physical units used to transmit data between the relay circuit B and the redundant relay circuit B' are also very likely to be partially or completely located in the same physical device, when the physical device occurs In case of failure, neither the relay circuit B nor the redundant relay circuit B' can work normally.

Therefore, the redundant relay circuit and the set relay circuit may be restricted by the same transmission route or the same physical equipment, and will work or not work at the same time, and it is impossible to use redundant relay circuits to improve IP network performance. purpose of reliability.

In the prior art, in order to further improve the reliability of the IP network, the IP network will also set a logical protection link for the relay circuit that has been set. When a node of the relay circuit fails, the relay circuit The data being transmitted can continue to be transmitted through the logical protection link, so that the data transmission will not be interrupted, but when the logical protection link and the set relay circuit are located on the same transmission route or the same When it is in a physical device, the logical protection link cannot achieve the purpose of ensuring uninterrupted data transmission, and therefore cannot improve the reliability of the IP network.

In order to ensure the reliability of the IP network, in addition to determining the redundant relay circuit and logical protection link according to the existing method, the method can further determine the redundant relay circuit and logical protection link through step 104 Protection link:

Step 104, determining a redundant relay circuit and a logical protection link in a circuit that is not on the same transmission route as the transmission relay circuit on the transport network, and is not on the same physical device.

Specifically, when determining a redundant relay circuit, it is possible to select a circuit from the data sending node to the A redundant relay circuit for the data receiving node to transmit data.

When determining the logical protection link, the logical protection link of the transmission relay circuit may be selected from a circuit in the transmission network that is not on the same transmission route and not on the same physical device as the transmission relay circuit.

Step 105, updating redundant relay circuits and logical protection links.

You can determine if redundant trunk circuits need to be updated by:

It is judged whether the route of the selected redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed, and if so, the redundant relay circuit is reselected.

The physical device to which the redundant relay circuit belongs refers to the physical device where part or all of the circuits in the redundant relay circuit are located.

In this step, the redundant relay circuit can also be updated when the set condition is met. The set condition may be the arrival of a set period time, or the occurrence of a set trigger event. Due to the change of the set redundant trunk circuit, it is very likely to occur when the IP network or/and the transmission network send a change. Therefore, the change sent by the IP network or/and the transport network can be used as a trigger event, and when at least one of the network information of the IP network and the network structure information of the transport network changes, the redundant relay that has been set can be judged Whether the circuit has changed, and when the set redundant relay circuit has changed, the redundant relay circuit is updated.

The network information includes network topology information and network traffic statistics information, and the network structure information includes network routing information and physical device information where transmission cables are located.

Specifically, as shown in FIG. 3, the following steps may be performed to update the redundant relay circuit when the set conditions are met:

Step 1051. Determine all circuits in the transport network that use the data sending node as the starting node for data transmission.

Step 1052. For each determined circuit, determine whether the transmission relay circuit and the circuit are in the same transmission route or in the same physical device.

In this step, the transmission relay circuit and the circuit being in the same transmission route or the same physical device may mean that part or all of the transmission relay circuit and part or all of the circuit are in the same Transit routing or the same physical device.

Specifically, for each determined circuit, a bit can be set. If the bit is 0, it means that the transmission relay circuit and the circuit are in the same transmission route or in the same physical device. If the bit is 1, it means that the transmission relay circuit is in the same physical device. The relay circuit is not in the same transmission route or in the same physical device as the circuit.

Step 1053: Determine the number of circuits on the same transmission route or on the same physical device as the transmission relay circuit.

The value of the bit corresponding to each circuit may be accumulated according to the set bit, so as to determine the number of circuits on the same transmission route or on the same physical device as the transmission relay circuit.

Step 1054: Determine the first number of circuits on the same transmission route or on the same physical device as the transmission relay circuit determined last time before the redundant relay circuit is selected, and select the redundant relay circuit The second number of circuits on the same transmission route or on the same physical device as the transmission relay circuit determined most recently after the subsequent circuit.

Step 1055, judging whether the route of the selected redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed.

When the second number is not equal to the first number, for example, when the second number is 22 and the first number is 25, determine the route of the redundant relay circuit and/or the redundant relay circuit If the physical device to which the road belongs has changed, continue to execute step 1056; otherwise, it may re-judge whether the set condition is satisfied, and re-execute step 1051 if the set condition is satisfied.

Step 1056, update the redundant relay circuit.

In this step, according to the network information of the IP network and the network structure information of the transport network, the resource (routing and physical equipment) occupancy of the transmission relay circuit on the transport network can be analyzed, according to the application of the redundant relay circuit The principle of reconfiguring redundant relay circuit.

Of course, in step 1053, the number of circuits that are not in the same transmission route or in the same physical device as the transmission relay circuit may also be determined.

Then in step 1054, it is possible to determine the first number of circuits that are not in the same transmission route or in the same physical device as the transmission relay circuit determined last time before the redundant relay circuit is selected, and The second number of circuits that are not in the same transmission route or in the same physical device as the transmission relay circuit determined most recently after the redundant relay circuit is found.

However, in step 1055, it may still be determined that the route of the redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed according to the fact that the second number is not equal to the first number.

The method for judging whether to update the logical protection link is the same as the method for judging whether it is necessary to update the redundant relay circuit, and the method for updating the logical protection link is also the same as the method for updating the redundant relay circuit. repeat.

Before step 101, the method may further include step 101':

Step 101', determining that at least one of the network information of the IP network and the network structure information of the transport network has changed.

When the IP network changes, the traffic and flow requirements of the IP network are very likely to change, and when the transport network changes, the circuits in the transport network are also very likely to change. Therefore, IP network or/and transport network When a change is sent, the steps of determining the relay circuit are performed.

And judging whether the IP network or/and the transport network has sent a change may be determined according to the received network information of the IP network and network structure information of the transport network.

The network information of the IP network and the network structure information of the transport network may be reported periodically, or may be reported when any one of the network information of the IP network and the network structure information of the transport network changes.

In the execution process of this embodiment, the logical protection link in the transport network can also be regarded as a common circuit for processing.

According to the method provided in Embodiment 1 of the present invention, not only can determine the transmission relay circuit with shorter data transmission delay, improve the speed of IP network using the transmission relay circuit to transmit data, but also can determine and transmit the relay circuit Redundant relay circuits and logical protection circuits corresponding to the transmission relay circuits that are not in the same transmission route or in the same physical device can improve the reliability of the IP network, and can also be used in the IP network and/or transport network When a change occurs, the transmission relay circuit, redundant relay circuit and logic protection circuit are updated in real time to further improve the reliability of the IP network and optimize the performance of the IP network.

According to the method provided in Embodiment 1 of the present invention, the following devices and systems are provided.

Embodiment two,

Embodiment 2 of the present invention provides a device for determining a relay circuit. The structural diagram of the device is shown in FIG. 4 , which specifically includes a first information determination module 11, a second information determination module 12 and a transmission relay circuit determination module. 13, of which:

The first information determination module 11 is used to determine the data sending node and the data receiving node of the Internet protocol IP network, and the first data transmission flow required for data transmission from the data sending node to the data receiving node; the second information is determined Module 12 is used to measure the data transmission delay of the circuit in the transmission network from the data sending node to the data receiving node, and the circuit in the transmission network supports the transmission from the data sending node to the data receiving node The second data transmission flow that can be carried when transmitting data is not less than the first data transmission flow, and the circuit in the transmission network that determines that the data transmission delay meets the set condition; the transmission relay circuit determination module 13 is used to The determined circuit is used as a transmission relay circuit for transmitting data from the data sending node to the data receiving node.

The second information determining module 12 is specifically configured to determine the ratio of the second data transmission flow rate to the data transmission delay by the following method:

in,

${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; /</span>\frac{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span>$

W _k represents the ratio of the second data transmission flow of the k-th circuit in the transport network to the data transmission delay of the k-th circuit, the minimum value of k is 1, and the maximum value is the one that satisfies the following conditions in the transport network Number of circuits:

Supporting data transmission from the data sending node to the data receiving node and the second data transmission traffic that can be carried is not less than the first data transmission traffic;

i and j respectively represent a transmission node, and i is a data sending node, and j is a data receiving node;

T _{i, j} represents the average value of the point-to-point traffic of the IP network from the transmission node i to the transmission node j within a measurement period;

T _i represents the total data flow of IP network transmission node i within a measurement period;

D _{i, k, j} represent the data transmission delay of the transmission network from the transmission node i to the transmission node j via the kth circuit;

D represents the maximum data transmission delay of the transport network.

The device also includes a redundant relay circuit determination module 14 and a logical protection link determination module 15, wherein:

The redundant relay circuit determination module 14 is used to select the transmission network from the data sending node to the data transmission route from a circuit in the transmission network that is not on the same transmission route as the transmission relay circuit and is not on the same physical device. Redundant relay circuit for data transmission by receiving nodes.

The logical protection link determination module 15 is used to select a logical protection link of the transmission relay circuit from a circuit in the transmission network that is not in the same transmission route and not in the same physical device as the transmission relay circuit .

The redundant relay circuit determination module 14 is specifically used to determine whether the routing of the selected redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed, and if so, reselect the redundant relay circuit. following the circuit.

The logical protection link determination module 15 is specifically configured to determine whether the route of the selected logical protection link and/or the physical device to which the logical protection link belongs has changed, and if so, reselect the logical protection link.

The redundant relay circuit determination module 14 is specifically used to determine all circuits in the transmission network that use the data sending node as the starting node of data transmission when the set conditions are met, and determine the connection with the determined circuit among all the determined circuits. The number of circuits on the same transmission route or on the same physical device as the above-mentioned transmission relay circuit, determine the last time before selecting the redundant relay circuit that is on the same transmission route or the same circuit as the transmission relay circuit The first number of circuits of the physical device, and the second number of circuits on the same transmission route or the same physical device as the transmission relay circuit determined most recently after the redundant relay circuit is selected, in When the second number is not equal to the first number, it is determined that the route of the redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed.

The logical protection link determination module 15 is specifically configured to determine all circuits in the transmission network that use the data sending node as the starting node for data transmission when the set conditions are met, and determine, among all the determined circuits, the The number of the transmission relay circuit in the same transmission route or the same physical device, determine the latest determined before the logical protection link is selected in the same transmission route or the same physical device as the transmission relay circuit The first number of circuits, and the second number of circuits that are on the same transmission route or the same physical device as the transmission relay circuit determined most recently after the logical protection link is selected, in the second When the quantity is not equal to the first quantity, it is determined that the route of the logical protection link and/or the physical device to which the logical protection link belongs has changed.

The device also includes a judging module 16:

The judging module 16 is configured to trigger the first information determining module when at least one of the network information of the IP network and the network structure information of the transport network has changed, the network information includes network topology information and network traffic statistics information , the network structure information includes network routing information and physical device information where the transmission cable is located.

The functional block diagram of described device can be as shown in Figure 5, and this device can carry out communication between the network interface of IP network through W1 interface, obtains the network information reported on IP network, carries out by W2 interface and the network interface of transmission network. Communication, obtain the network structure information reported on the transmission network, and store the obtained network information and network structure information in the joint optimization database. The cross-layer optimization index calculation engine of the device can determine the relay power based on the information stored in the joint optimization database. road. In FIG. 5, the network interface of the IP network and the network interface of the transport network are represented by one network interface. Preferably, the device can also manage the W1 interface, W2 interface, network interface, joint optimization database and cross-layer optimization index calculation engine through the security audit unit and the maintenance management unit.

Described device can be arranged in IP network, also can be arranged in transport network, described device also can be the device that is independent of IP network and transport network, then as shown in Figure 6, this device can be connected with IP network, transport network Together they constitute a system for determining the relay circuit, and the device can communicate with the IP network through the W1 interface, receive network information reported on the IP network, communicate with the transmission network through the W2 interface, and receive information reported on the transmission network. Network structure information, W1 interface and W2 interface can be defined by Extensible Markup Language (XML, Extensible Markup Language), and the file transfer protocol (FTP, File Transfer Protocol) can be used for data transmission.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (13)

1. A method for determining a relay circuit, characterized in that the method comprises: Determining a data sending node and a data receiving node of the Internet Protocol IP network, and a first data transmission flow required for data transmission from the data sending node to the data receiving node; Measuring the data transmission delay for circuits in the transmission network to transmit data from the data sending node to the data receiving node, where the circuits in the transmission network support transmission of data from the data sending node to the data receiving node can The second data transmission traffic carried is not less than the first data transmission traffic; Determining the circuits in the transmission network whose data transmission delay meets the set condition; The determined circuit is used as a transmission relay circuit for transmitting data from the data sending node to the data receiving node. 2. The method according to claim 1, wherein the data transmission delay meeting the set condition means: The ratio of the second data transmission traffic that the circuit can carry to the data transmission delay is greater than a set value. 3. The method according to claim 2, wherein the ratio of the second data transmission flow rate to the data transmission delay is determined by the following method: in, ${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; /</span>\frac{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span>$ W _k represents the ratio of the second data transmission flow of the k-th circuit in the transport network to the data transmission delay of the k-th circuit, the minimum value of k is 1, and the maximum value is the one that satisfies the following conditions in the transport network Number of circuits: Supporting data transmission from the data sending node to the data receiving node and the second data transmission traffic that can be carried is not less than the first data transmission traffic; i and j respectively represent a transmission node, and i is a data sending node, and j is a data receiving node; T _{i, j} represents the average value of the point-to-point traffic of the IP network from the transmission node i to the transmission node j within a measurement period; T _i represents the total data flow of IP network transmission node i within a measurement period; D _{i, k, j} represent the data transmission delay of the transmission network from the transmission node i to the transmission node j via the kth circuit; D represents the maximum data transmission delay of the transport network. 4. The method according to claim 1, wherein after using the determined circuit as a transmission relay circuit for transmitting data from the data sending node to the data receiving node, the method further comprises: Select a redundant relay circuit that transmits data from the data sending node to the data receiving node from a circuit in the transport network that is not on the same transmission route and not on the same physical device as the transmission relay circuit ;and / or Selecting a logical protection link of the transmission relay circuit from a circuit in the transmission network that is not on the same transmission route and not on the same physical device as the transmission relay circuit. 5. The method according to claim 4, characterized in that, after the redundant relay circuit and/or logical protection link is selected, the method further comprises: Judging whether the route of the selected redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed, and if so, reselecting the redundant relay circuit; and It is judged whether the route of the selected logical protection link and/or the physical device to which the logical protection link belongs has changed, and if so, the logical protection link is reselected. 6. The method of claim 5, further comprising: When the set conditions are met, perform the following operations: determining all circuits in the transport network that use the data sending node as the starting node of data transmission; Among all the determined circuits, determine the number of circuits on the same transmission route or on the same physical device as the transmission relay circuit; Determine whether the route of the selected redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed, specifically including: Determining the first number of circuits on the same transmission route or the same physical device as the transmission relay circuit determined last time before the redundant relay circuit is selected, and selecting the redundant relay circuit The second number of circuits on the same transmission route or on the same physical device as the transmission relay circuit determined most recently; When the second number is not equal to the first number, determine that the route of the redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed; Determine whether the route of the selected logical protection link and/or the physical device to which the logical protection link belongs has changed, specifically including: determining the first number of circuits on the same transmission route or in the same physical device as the transmission relay circuit determined most recently before the logical protection link is selected, and the most recent one after the logical protection link is selected the determined second number of circuits on the same transmission route or on the same physical device as the transmission relay circuit; When the second number is not equal to the first number, it is determined that the route of the logical protection link and/or the physical device to which the logical protection link belongs has changed. 7. The method according to claim 1, characterized in that, determining the data sending node and the data receiving node of the Internet protocol IP network, and the first data required for data transmission from the data sending node to the data receiving node Before transmitting the traffic, the method further includes: Determine that at least one of the network information of the IP network and the network structure information of the transport network has changed; The network information includes network topology information and network traffic statistics information, and the network structure information includes network routing information and physical device information where transmission cables are located. 8. A device for determining a relay circuit, characterized in that the device comprises: The first information determination module is used to determine the data sending node and the data receiving node of the Internet protocol IP network, and the first data transmission flow required for data transmission from the data sending node to the data receiving node; The second information determination module is used to measure the data transmission delay of the circuit in the transmission network from the data sending node to the data receiving node, and the circuit in the transmission network supports the transmission from the data sending node to the data receiving node. A circuit in the transmission network whose second data transmission traffic that the data receiving node can carry when transmitting data is not less than the first data transmission traffic, and that determines that the data transmission delay satisfies a set condition; A transmission relay circuit determination module, configured to use the determined circuit as a transmission relay circuit for transmitting data from the data sending node to the data receiving node. 9. The apparatus of claim 8, wherein The second information determination module is specifically configured to determine the ratio of the second data transmission flow to the data transmission delay by the following method: in, ${\mathrm{<span\; class="notranslate">\; W</span>}}_{\mathrm{<span\; class="notranslate">\; k</span>}}<span\; class="notranslate">\; =</span><span\; class="notranslate">\; (</span>\frac{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{{\mathrm{<span\; class="notranslate">\; T</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; /</span>\frac{{\mathrm{<span\; class="notranslate">\; D.</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; k</span>}<span\; class="notranslate">\; ,</span>\mathrm{<span\; class="notranslate">\; j</span>}}}{\mathrm{<span\; class="notranslate">\; D.</span>}}<span\; class="notranslate">\; )</span>$ W _k represents the ratio of the second data transmission flow of the k-th circuit in the transport network to the data transmission delay of the k-th circuit, the minimum value of k is 1, and the maximum value is the one that satisfies the following conditions in the transport network Number of circuits: Supporting data transmission from the data sending node to the data receiving node and the second data transmission traffic that can be carried is not less than the first data transmission traffic; i and j respectively represent a transmission node, and i is a data sending node, and j is a data receiving node; T _{i, j} represents the average value of the point-to-point traffic of the IP network from the transmission node i to the transmission node j within a measurement period; T _i represents the total data flow of IP network transmission node i within a measurement period; D _{i, k, j} represent the data transmission delay of the transmission network from the transmission node i to the transmission node j via the kth circuit; D represents the maximum data transmission delay of the transport network. 10. The device according to claim 8, further comprising a redundant relay circuit determining module and a logical protection link determining module, wherein: A redundant relay circuit determination module, configured to select the data transmission node from the data sending node from a circuit in the transmission network that is not on the same transmission route as the transmission relay circuit and that is not on the same physical device. Redundant relay circuit for receiving node to transmit data; A logical protection link determining module, configured to select a logical protection link of the transmission relay circuit from a circuit in the transmission network that is not on the same transmission route and not on the same physical device as the transmission relay circuit . 11. The apparatus of claim 10, wherein The redundant relay circuit determination module is specifically used to judge whether the route of the selected redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed, and if so, reselect the redundant relay circuit relay circuit; The logical protection link determination module is specifically used to determine whether the route of the selected logical protection link and/or the physical device to which the logical protection link belongs has changed, and if so, reselect the logical protection link. 12. The apparatus of claim 11, wherein The redundant relay circuit determination module is specifically used to determine all circuits in the transmission network that use the data sending node as the starting node of data transmission when the set conditions are met, and determine, among all the determined circuits, the The number of circuits on the same transmission route or on the same physical device as the above-mentioned transmission relay circuit, determine the last time before selecting the redundant relay circuit that is on the same transmission route or the same circuit as the transmission relay circuit The first number of circuits of the physical device, and the second number of circuits on the same transmission route or the same physical device as the transmission relay circuit determined most recently after the redundant relay circuit is selected, in When the second number is not equal to the first number, it is determined that the route of the redundant relay circuit and/or the physical device to which the redundant relay circuit belongs has changed; The logical protection link determination module is specifically used to determine all circuits in the transmission network that use the data sending node as the starting node of data transmission when the set conditions are met, and determine all circuits that are related to the determined The number of the transmission relay circuit in the same transmission route or the same physical device, determine the latest determined before the logical protection link is selected in the same transmission route or the same physical device as the transmission relay circuit The first number of circuits, and the second number of circuits that are on the same transmission route or the same physical device as the transmission relay circuit determined most recently after the logical protection link is selected, in the second When the quantity is not equal to the first quantity, it is determined that the route of the logical protection link and/or the physical device to which the logical protection link belongs has changed. 13. The device according to claim 8, further comprising a judging module: A judging module, configured to trigger a first information determining module when at least one of the network information of the IP network and the network structure information of the transport network has changed, the network information includes network topology information and network traffic statistics information , the network structure information includes network routing information and physical device information where the transmission cable is located.

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