CN108075976A - A kind of method and device for carrying out plan Bandwidth adjustment - Google Patents

A kind of method and device for carrying out plan Bandwidth adjustment Download PDF

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Publication number
CN108075976A
CN108075976A CN201610998292.1A CN201610998292A CN108075976A CN 108075976 A CN108075976 A CN 108075976A CN 201610998292 A CN201610998292 A CN 201610998292A CN 108075976 A CN108075976 A CN 108075976A
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Prior art keywords
bandwidth
planned
plan
pcc
bandwidth adjustment
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熊泉
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ZTE Corp
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ZTE Corp
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Priority to CN201610998292.1A priority Critical patent/CN108075976A/en
Priority to PCT/CN2017/110096 priority patent/WO2018086552A1/en
Publication of CN108075976A publication Critical patent/CN108075976A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0896—Bandwidth or capacity management, i.e. automatically increasing or decreasing capacities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/70—Admission control; Resource allocation
    • H04L47/76—Admission control; Resource allocation using dynamic resource allocation, e.g. in-call renegotiation requested by the user or requested by the network in response to changing network conditions

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses it is a kind of carry out plan Bandwidth adjustment method, including:The plan Bandwidth adjustment parameter for including plan bandwidth that stateful path-calculating element PCE is sent by the protocol extension RX path plan subscriber PCC plan Bandwidth adjustment parameters for including plan bandwidth sent or receiving network managing system NMS, control terminal；Plan Bandwidth adjustment is carried out according to the plan Bandwidth adjustment parameter, to determine the label switching path LSP under the plan bandwidth.The embodiment of the present invention also provides a kind of device for carrying out plan Bandwidth adjustment.

Description

Method and device for adjusting planned bandwidth
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for adjusting a planned bandwidth.
Background
In network application, the bandwidth requirement of a Label Switched Path (LSP) changes with time, when the LSP bandwidth needs to be adjusted, a first node will delete an original LSP first by adopting a mode of deleting and then establishing the LSP, and then request a Path Computation Element (PCE) to re-compute the Path, the PCE will return a new route, and a Path Computation Client (PCC) will prompt LSP signaling to establish after receiving the Path Computation Client (PCC). The need and application of stateful PCEs has been proposed in recent years. draft-ietf-PCE-stateful-PCE-16 proposes an extension of the requirements of stateful PCEs to the Path Computation Protocol (PCEP) Protocol. Because the stateful PCE has the information of the LSP in the domain, the computation path and the bandwidth adjustment can be actively initiated, the message interaction between the PCC and the PCE is reduced, the centralized management and control of the network are enhanced, and the bandwidth adjustment is more efficient. ietf-pce-stateful-pce-apps put forward the need for automatic bandwidth adjustment and planning. draft-dhody-PCE-stateful-PCE-auto-bandwidth-08 proposes a method for dynamic bandwidth adjustment using a stateful PCE. Generally, the head and tail nodes monitor the actual bandwidth utilization rate, and when a set threshold is reached, recalculation and signaling are prompted. However, in some scenarios, the traffic of the head and tail nodes cannot be monitored or the traffic changes frequently, and automatic bandwidth adjustment cannot be realized. And the customer requires that a particular bandwidth requirement be guaranteed within a particular time, in order to meet that requirement, the PCE is required to implement the function of planning bandwidth.
In a centralized network environment, scheduled bandwidth scaling allows network operators to reserve resources ahead of time, according to agreements with customers, allowing them to transfer data using a certain bandwidth at a particular start time and interval. Conventionally, a Network Management System (NMS) supports path pre-establishment and activation at a protocol start time, which is inefficient. Related request information, such as start time and duration, may also be carried via a Generalized Multi-Protocol label switching (GMPLS) Protocol extension, but this may increase the complexity of signaling and routing.
Based on this, there is a need for a technical solution of a method for adjusting a planned bandwidth, which realizes adjustment of the planned bandwidth in a stateful PCE scenario to improve network resource utilization efficiency.
Disclosure of Invention
In view of this, embodiments of the present invention are intended to provide a method and an apparatus for adjusting a planned bandwidth, so as to implement adjustment of the planned bandwidth and improve utilization efficiency of network resources in a stateful PCE scenario.
The technical scheme of the embodiment of the invention is realized as follows:
in one aspect, an embodiment of the present invention provides a method for adjusting a planned bandwidth, where the method includes:
a stateful path computation element PCE receives a planned bandwidth adjustment parameter which is sent by a path plan client PCC and comprises a planned bandwidth through protocol extension, or receives a planned bandwidth adjustment parameter which is sent by a network management system NMS and a control terminal and comprises a planned bandwidth;
and carrying out plan bandwidth adjustment according to the plan bandwidth adjustment parameters to determine the Label Switching Path (LSP) under the plan bandwidth.
In the above aspect, the method further includes:
sending a planned bandwidth adjustment capability identifier to the PCC through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
In the above aspect, the method further includes:
receiving an acceptance plan bandwidth adjustment capacity identification sent by the PCC through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
In the foregoing solution, after receiving, by the protocol extension, a planned bandwidth adjustment parameter including a planned bandwidth sent by the PCC, the method further includes:
saving the plan bandwidth adjustment parameter and informing the TED to reserve resources to determine a resource reservation result; and sending the resource reservation result to the PCC through protocol extension.
In the foregoing solution, the performing, according to the planned bandwidth adjustment parameter, planned bandwidth adjustment to determine an LSP under the planned bandwidth includes:
and when the time reaches the starting time in the plan adjustment parameters, performing path calculation according to the plan bandwidth to obtain a path calculation result under the plan bandwidth so as to determine the LSP under the plan bandwidth.
In the above aspect, the method further includes:
and sending the path calculation result under the planned bandwidth to the PCC through protocol extension to indicate the PCC to delete the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
On the other hand, an embodiment of the present invention further provides a method for adjusting a planned bandwidth, where the method includes:
a path plan client PCC sends a plan bandwidth adjustment parameter comprising a plan bandwidth to a stateful path computation element PCE through a protocol extension; and the plan bandwidth adjustment parameter is used for the PCE to perform plan bandwidth adjustment according to the plan adjustment parameter so as to determine a Label Switched Path (LSP) under the plan bandwidth.
In the above aspect, the method further includes:
receiving a planned bandwidth adjustment capacity identification sent by the stateful PCE through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
In the above aspect, the method further includes:
sending an acceptance plan bandwidth adjustment capability identifier to the stateful PCE through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
In the above aspect, the method further includes:
receiving a path calculation result under the planned bandwidth sent by the stateful PCE through protocol extension;
and deleting the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
An embodiment of the present invention further provides a device for adjusting a planned bandwidth, where the device includes: a parameter configuration unit and an adjustment unit; wherein,
the parameter configuration unit is used for the stateful path computation element PCE to receive the planned bandwidth adjustment parameters including the planned bandwidth sent by the path plan client PCC through protocol extension, or to receive the planned bandwidth adjustment parameters including the planned bandwidth sent by the network management system NMS and the control terminal;
and the adjusting unit is used for performing planned bandwidth adjustment according to the planned bandwidth adjustment parameter so as to determine a Label Switched Path (LSP) under the planned bandwidth.
In the above solution, the apparatus further comprises: a first sending unit configured to: sending a planned bandwidth adjustment capability identifier to the PCC through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
In the above solution, the apparatus further comprises: a first receiving unit configured to:
receiving an acceptance plan bandwidth adjustment capacity identification sent by the PCC through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
In the above solution, the apparatus further comprises: a resource notification unit configured to:
after receiving a planned bandwidth adjustment parameter including a planned bandwidth sent by PCC through protocol extension, storing the planned bandwidth adjustment parameter, and informing a TED to reserve resources to determine a resource reservation result;
and sending the resource reservation result to the PCC through protocol extension.
In the foregoing solution, the adjusting unit is specifically configured to:
and when the time reaches the starting time in the plan adjustment parameters, performing path calculation according to the plan bandwidth to obtain a path calculation result under the plan bandwidth so as to determine the LSP under the plan bandwidth.
In the above solution, the apparatus further comprises: an indication unit configured to:
and sending the path calculation result under the planned bandwidth to the PCC through protocol extension to indicate the PCC to delete the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
An embodiment of the present invention further provides a device for adjusting a planned bandwidth, where the device includes: a parameter sending unit, configured to send, by the PCC, a planned bandwidth adjustment parameter including a planned bandwidth to the stateful path computation element PCE through a protocol extension; and the plan bandwidth adjustment parameter is used for the PCE to perform plan bandwidth adjustment according to the plan adjustment parameter so as to determine a Label Switched Path (LSP) under the plan bandwidth.
In the above solution, the apparatus further comprises: a second transmitting unit configured to:
receiving a planned bandwidth adjustment capacity identification sent by the stateful PCE through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
In the above solution, the apparatus further comprises: a second receiving unit configured to:
sending an acceptance plan bandwidth adjustment capability identifier to the stateful PCE through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
In the above solution, the apparatus further comprises: an LSP adjustment unit to:
receiving a path calculation result under the planned bandwidth sent by the stateful PCE through protocol extension;
and deleting the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
The method and the device for adjusting the planned bandwidth comprise the steps that a stateful PCE receives planned bandwidth adjustment parameters which are sent by PCC and comprise the planned bandwidth through protocol extension, or receives the planned bandwidth adjustment parameters which are sent by a Network Management System (NMS) and a control terminal and comprise the planned bandwidth; and carrying out plan bandwidth adjustment according to the plan bandwidth adjustment parameters to determine the Label Switching Path (LSP) under the plan bandwidth. In this way, the stateful PCE adjusts the planned bandwidth according to the received planned bandwidth adjustment parameter including the planned bandwidth and according to the planned bandwidth adjustment parameter to perform adjustment of the planned bandwidth to establish the LSP under the planned bandwidth. The adjustment of the control plan bandwidth of the stateful PCE under the stateful PCE scene is realized, and the utilization efficiency of network resources is improved.
Drawings
Fig. 1 is a flowchart illustrating a method for performing a scheduled bandwidth adjustment according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for performing a planned bandwidth adjustment according to a second embodiment of the present invention;
fig. 3 is a schematic diagram of a network structure according to a third embodiment of the present invention;
fig. 4 is a first schematic format diagram of a protocol extension according to a third embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a format of a protocol extension according to a third embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a capability exchange flow between a stateful PCE and a PCC according to a fourth embodiment of the present invention;
fig. 7 is a flowchart illustrating that a PCC initiates configuration of a planned bandwidth adjustment parameter to a stateful PCE according to a fifth embodiment of the present invention;
fig. 8 is a flowchart illustrating a process of a user initiating a request for configuring a planned bandwidth adjustment parameter to a stateful PCE according to a sixth embodiment of the present invention;
fig. 9 is a schematic flowchart of successful adjustment of the execution plan bandwidth according to a seventh embodiment of the present invention;
fig. 10 is a schematic diagram illustrating a failure flow of performing a scheduled bandwidth adjustment according to an eighth embodiment of the present invention;
fig. 11 is a first schematic structural diagram of an apparatus for performing a scheduled bandwidth adjustment according to a ninth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a device for performing adjustment of a planned bandwidth according to a ninth embodiment of the present invention;
fig. 13 is a first schematic structural diagram of an apparatus for performing a scheduled bandwidth adjustment according to a tenth embodiment of the present invention;
fig. 14 is a second schematic structural diagram of an apparatus for performing adjustment of a planned bandwidth according to a tenth embodiment of the present invention.
Detailed Description
In the prior art, RFC4655 describes a PCE-based architecture for path computation for Multi-Protocol Label Switching (MPLS) and GMPLS Traffic Engineering (TE) LSPs. A PCE is an entity, component, application, or network node capable of computing a network path or route based on a network graph and applying computational constraints. A PCC is a client application that requests a path computation to be performed by a PCE. In RFC5440, it is proposed that PCE and PCC use PCEP protocol as a communication protocol, and PCC requests PCE for path or route computation through PCEP protocol. In an MPLS or GMPLS network, when a user wants to establish an LSP, a head node is generally used as a PCC, a PCE is requested to perform path computation, a computation result is returned to the PCC, and the PCC triggers establishment of an LSP signaling.
In various embodiments of the invention: the stateful PCE receives a planned bandwidth adjustment parameter which is sent by the PCC and comprises a planned bandwidth through protocol extension, or receives a planned bandwidth adjustment parameter which is sent by the NMS and the control terminal and comprises a planned bandwidth; and carrying out plan bandwidth adjustment according to the plan bandwidth adjustment parameters, and determining a Label Switching Path (LSP) under the plan bandwidth.
The following describes the embodiments in further detail with reference to the accompanying drawings.
Example one
An embodiment of the present invention provides a method for adjusting a planned bandwidth, which is applied to a stateful PCE, and as shown in fig. 1, the method includes:
s101, the stateful PCE receives a planned bandwidth adjustment parameter which is sent by PCC and comprises a planned bandwidth through protocol extension, or receives a planned bandwidth adjustment parameter which is sent by NMS and a control terminal and comprises a planned bandwidth;
the stateful PCE may receive planned bandwidth adjustment parameters for a planned bandwidth adjustment in two ways, where the planned adjustment parameters include a planned bandwidth and may also include information related to the planned bandwidth adjustment, such as a planned start time, a planned end time, and a duration. Specifically, the method comprises the following steps:
receiving a planned bandwidth adjustment parameter which is sent by PCC and comprises a planned bandwidth through a protocol extension; in this approach, planned bandwidth adjustment is actively initiated by the PCC.
When the PCC requests the stateful PCE to carry out the LSP path calculation, the PCC informs the PCE to carry out the configuration of the planned bandwidth adjustment parameter by carrying the planned bandwidth adjustment parameter, wherein the PCC can request the stateful PCE to carry out the LSP path calculation by the PCReq message and carries the planned bandwidth adjustment parameter. Here, the PCReq message is a PCReq message that has undergone protocol extension, and the LSP path requested to be calculated is an LSP path under the original bandwidth relative to the planned bandwidth, that is, an LSP path under the current bandwidth; the planned bandwidth adjustment parameter carries the planned bandwidth.
Here, after the PCC establishes the LSP under the original bandwidth, the PCRpt message after protocol extension carries the planned bandwidth adjustment parameter, initiates a request for configuring the planned bandwidth adjustment parameter to the stateful PCE, and notifies the stateful PCE to configure the planned bandwidth adjustment parameter.
Here, the extended protocol may be a PCEP protocol that interacts between PCCs and stateful PCEs.
Receiving a plan bandwidth adjustment parameter including plan bandwidth sent by the NMS and the control terminal; in this way, for a stateful PCE with an active initiation plan bandwidth adjustment capability, configuration of plan bandwidth adjustment parameters is performed based on the needs of a user.
The user can initiate a request for configuring the plan bandwidth adjustment parameter through the NMS or the application APP on the control terminal, wherein the specific plan adjustment parameter can be set by the user according to specific requirements. When an application program APP on an NMS or a control terminal receives a plan bandwidth adjustment parameter configuration request of a user, sending the plan bandwidth adjustment parameter set by the user to a stateful PCE through an interface between the stateful PCE and the plan bandwidth adjustment parameter configuration request carrying the plan bandwidth adjustment parameter; and the stateful PCE receives the planned bandwidth adjustment parameters sent by the NMS or the control terminal and configures the planned bandwidth adjustment parameters.
In the embodiment of the invention, the stateful PCE sends a planned bandwidth adjustment capacity identifier to the PCC through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment. The stateful PCE can also receive the receiving plan bandwidth adjustment capability identification sent by the PCC through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments. The stateful PCE informs the other side whether to provide the planned bandwidth adjustment capability or not through the interaction of the planned bandwidth adjustment capability identification and the accepted planned bandwidth adjustment capability identification between the stateful PCE and the PCC.
Here, the stateful PCE and PCC may indicate whether to support the planned bandwidth adjustment by notifying capabilities of themselves to the peer end through an Open message carrying a planned bandwidth adjustment capability identifier or a plan bandwidth adjustment capability acceptance identifier, where the planned bandwidth adjustment capability identifier and the plan bandwidth adjustment capability acceptance identifier may be represented by bits.
After receiving a planned bandwidth adjustment parameter including a planned bandwidth sent by PCC through protocol extension by a stateful PCE, storing the planned bandwidth adjustment parameter, and informing a Traffic Engineering database (Traffic Engineering database, TED) of a reserved resource receiving resource reservation result; and sending the resource reservation result to the PCC through protocol extension. The stateful PCE may send the resource reservation result to the PCC through the PCRep message, where the specific implementation of resource reservation may be implemented through the prior art, and is not described in detail herein.
When a state PCE receives a plan bandwidth adjustment parameter through a PCreq message sent by the PCC, the PCC requests the state PCE to perform path calculation under the original bandwidth, after receiving the PCreq message, the PCC performs path calculation of the original bandwidth and stores the carried plan bandwidth adjustment parameter, informs a TED to reserve resources, and sends a PCRep message to the PCC to respond to the PCReq message, wherein the PCRep message carries a path calculation result and a resource reservation condition under the original bandwidth.
S102, carrying out plan bandwidth adjustment according to the plan bandwidth adjustment parameters, and determining the LSP under the plan bandwidth.
Specifically, after receiving the planned bandwidth adjustment parameter, the stateful PCE determines information related to the planned bandwidth, such as start time, planned bandwidth, duration, and the like, and when the time reaches the start time in the planned adjustment parameter, performs path computation according to the planned bandwidth to obtain a path computation result under the planned bandwidth, so as to determine the LSP under the planned bandwidth. Here, the planned bandwidth in the planned bandwidth adjustment parameter is a new planned bandwidth that needs to be established.
And when determining that the path calculation result under the planned bandwidth is sent to the PCC by protocol extension, indicating the PCC to delete the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
Here, when the start time is reached, the stateful PCE actively initiates path computation under the planned bandwidth to obtain a path computation result under the planned bandwidth, sends a PCUpd message to the PCC to initiate a bandwidth adjustment request on the path computation result under the planned bandwidth, and the PCC deletes the LSP of the original bandwidth after receiving the PCUpd message, and reestablishes the LSP under the planned bandwidth according to the path computation result.
When the duration time in the planned bandwidth adjustment parameter is over, the PCE acquires a path calculation result under the original bandwidth, sends the path calculation result under the original bandwidth to the PCC through the PCUpd message, requests the PCC to delete the LSP under the planned bandwidth, and establishes the LSP under the original bandwidth according to the path calculation result under the original bandwidth. It should be noted that, before the PCC establishes the LSP under the original bandwidth, when receiving a path calculation result under another new planned bandwidth (i.e., a third planned bandwidth) sent by the PCE, the PCC may delete the LSP under the planned bandwidth and establish the LSP under the third bandwidth according to the path calculation result under the third planned bandwidth.
In the embodiment of the invention, the stateful PCE receives a planned bandwidth adjustment parameter sent by the PCC, the NMC or the control terminal, performs path calculation under the planned bandwidth according to the starting time in the planned adjustment parameter to obtain a path calculation result under the planned bandwidth, and sends the path calculation result under the planned bandwidth to the PCC through protocol extension, so that the PCC establishes an LSP under the planned bandwidth, the adjustment of the planned bandwidth of the stateful PCE is realized, and the stateful PCE determines the duration of the LSP under the planned bandwidth in the PCC according to the ending time or the duration in the planned adjustment parameter. Therefore, the planning bandwidth is adjusted through the stateful PCE, the complexity of signaling and routing is reduced, and the utilization efficiency of network resources is improved.
Example two
The present embodiment provides a method for performing a planned bandwidth adjustment, which is applied to PCC, and as shown in fig. 2, the method includes:
s201, PCC sends a plan bandwidth adjustment parameter including a plan bandwidth to a stateful PCE through protocol extension; the plan bandwidth adjustment parameter is used for the PCE to perform plan bandwidth adjustment according to the plan adjustment parameter so as to determine a Label Switched Path (LSP) under the plan bandwidth;
in the embodiment of the invention, PCC receives the planned bandwidth adjustment capacity identification sent by the stateful PCE through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment. The PCC sends an identification of receiving plan bandwidth adjustment capacity to the stateful PCE through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
Here, the stateful PCE and PCC may advertise their own capabilities to the peer via Open messages, indicating whether or not to support the scheduled bandwidth adjustment, and the indication of the scheduled bandwidth adjustment capability and the indication of the acceptance of the scheduled bandwidth adjustment capability may be represented by bits.
When the PCC sends the planned bandwidth adjusting parameters to the stateful PCE, the planned bandwidth adjusting parameters can be sent to the stateful PCE through the PCRpt messages independently, and the planned bandwidth adjusting parameters and the path calculation request under the original bandwidth can be sent to the stateful PCE through the PCReq messages.
When the PCC sends the planning bandwidth adjustment parameter to the stateful PCE through the PCRpt message, the process that the PCC requests path calculation under the original bandwidth from the stateful PCE is separated from the process of sending the planning bandwidth adjustment parameter, and after the PCC completes the establishment of the LSP under the original bandwidth, the planning bandwidth adjustment parameter is sent to the stateful PCE through the PCRpt message so as to indicate the stateful PCE to configure the planning bandwidth adjustment parameter.
When the PCC initiatively initiates a plan bandwidth adjustment task and the PCC requests the stateful PCE to calculate the LSP path, the PCC carries plan bandwidth adjustment parameters and informs the PCE to configure the plan bandwidth adjustment parameters. The scheduled bandwidth adjustment configuration parameters include the scheduled bandwidth, as well as start time, duration, and other information related to the scheduled bandwidth adjustment. Here, the PCC may request the stateful PCE to perform LSP path computation under the original bandwidth and carry the planned bandwidth adjustment parameters by sending a PCReq message to the stateful PCE. And after receiving the PCReq message sent by the PCE, the stateful PCE returns a PCRep message to the PCC to inform the resource reservation condition and stores the scheduled bandwidth adjustment parameters. And when the time reaches the starting time, the stateful PCE performs path calculation according to the adjustment parameter of the planned bandwidth to obtain a path calculation result under the planned bandwidth, and sends the path calculation result under the planned bandwidth to the PCC through the PCUpd message.
S202, receiving a path calculation result under the planned bandwidth sent by the stateful PCE through protocol extension; and deleting the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
And when the PCC receives the path calculation result under the planned bandwidth sent by the stateful PCE, deleting the LSP of the original bandwidth, and reestablishing the LSP under the new bandwidth according to the path calculation result under the planned bandwidth. At this point, the adjustment of the planned bandwidth is completed.
It should be noted that, in the embodiment of the present invention, the protocol used for performing message interaction between the PCC and the stateful PCE may be a PCEP protocol, and the message in the PCEP protocol is used to implement interaction between the PCC and the stateful PCE by extending the PCEP protocol, so as to complete adjustment of a planned bandwidth.
In the embodiment of the invention, the PCC sends the plan bandwidth adjustment parameter to the stateful PCE through protocol extension, so that the stateful PCE triggers the calculation of path calculation under the plan bandwidth according to the received plan bandwidth adjustment parameter to obtain the path calculation result under the plan bandwidth; and when the PCC receives the path calculation result under the planned bandwidth sent by the stateful PCE, updating the LSP to realize the adjustment of the planned bandwidth. In addition, in the embodiment of the present invention, before performing the scheduled bandwidth adjustment, capability notification is performed between the PCC and the stateful PCE to confirm whether the two interacting parties have the capability of scheduled bandwidth adjustment, so as to ensure reliable implementation of the scheduled bandwidth adjustment.
EXAMPLE III
In this embodiment, a method for performing scheduled bandwidth adjustment according to an embodiment of the present invention is exemplarily illustrated by a network architecture shown in fig. 3.
As shown in fig. 3, the stateful PCE communicates with network nodes, including node a, node B, node C, and node D, via the PCEP protocol. The stateful PCE interfaces with the NMS or the APP of the control terminal. Here, the stateful PCE allows the PCE to actively initiate LSP establishment, and also allows the PCC to request the stateful PCE to perform path computation to establish an LSP and then authorize the stateful PCE.
After the TCP connection of the PCEP session between the stateful PCE and the PCC is established, the PCC and the stateful PCE mutually send Open messages to mutually inform the capability of the PCC and the stateful PCE to the opposite end, and whether the planned bandwidth adjustment is supported or not is indicated. Here, a new bit a, namely SCHED-BW-ADJUST-CAPABILITY, may be extended in the STATEFUL-PCE-CAPABILITY TLV carried in the Open object of the Open message of PCEP protocol to indicate whether a STATEFUL PCE or PCC supports planned bandwidth adjustment.
When the Open message is a message sent by the stateful PCE to the PCC, SCHED-BW-ADJUST-CAPABLITY is a planned bandwidth adjustment capability identifier used for representing whether the stateful PCE has the capacity of planned bandwidth adjustment. When the Open message is a message sent by the PCC to the stateful PCE, SCHED-BW-ADJUST-CAPABLITY is an identification for accepting the planned bandwidth adjustment capability, and is used for representing whether the PCC has the capability of accepting the planned bandwidth adjustment.
The format of the STATeFUSE-PCE-CAPABILITY TLV as shown in FIG. 4, where the A bits are extended, the description of the A bit field is as follows:
a (SCHED-BW-ADJUST-CAPABLITY-1 bit): if the PCC sets the PCC to be 1, the PCC has the capacity of accepting the planned bandwidth adjustment, and the bandwidth plan adjustment function is allowed; if the stateful PCE sets it to 1, this indicates that the stateful PCE has the capability to plan bandwidth adjustment.
For the stateful PCE with PCE active initiation capability, due to the requirement of a user, under the request of the APP application of an NMS or a control terminal, a plan bandwidth adjustment parameter is configured in the stateful PCE; if the task is a planned bandwidth task actively initiated by the PCC, when the PCC requests the stateful PCE to perform LSP path calculation, the PCE carries planned bandwidth adjustment parameters, and initiates a planned bandwidth adjustment parameter configuration request to inform the stateful PCE of performing the configuration of the planned bandwidth adjustment parameters. The configured scheduled bandwidth adjustment parameters include a start time, a duration, a scheduled bandwidth value, and the like.
When a stateful PCE receives a request for configuring the scheduled bandwidth adjustment parameters, the TED needs to be informed to reserve resources. The resource reservation method is not described in detail herein.
When the starting time is reached, the stateful PCE triggers the adjustment of the planned bandwidth by a data link table. The interaction between the PCC and the PCE in the process of planning bandwidth adjustment is as follows:
in order to implement the plan bandwidth adjustment actively initiated by the PCC in the centralized network environment, the PCC needs to send a PCReq message first to request a stateful PCE to perform path computation and establish an LSP, and carry plan bandwidth adjustment parameters.
And the stateful PCE receives the planned bandwidth adjustment parameter, then stores the planned bandwidth adjustment parameter, informs the TED to reserve resources, and sends a PCRep message to the PCC to respond to the PCReq message, wherein the PCRep message carries a path calculation result and a resource reservation condition. The PCReq message is used for indicating the path calculation under the original bandwidth, and after receiving the PCReq message, the stateful PCE performs the path calculation under the original bandwidth to obtain a path calculation result under the original bandwidth and sends the path calculation result to the PCC through the PCRep message. Here, PCRep responds to the path calculation result of the current bandwidth, and PCUpd carries the path calculation result under the plan bandwidth recalculated after adjusting the bandwidth. )
When the time reaches the starting time in the plan adjustment parameters, the stateful PCE actively initiates path computation under the plan bandwidth, sends a PCUpd message carrying the path computation result to the PCC to initiate a plan bandwidth adjustment request, deletes the LSP of the original bandwidth after the PCC receives the PCUpd message, and reestablishes the LSP under the plan bandwidth according to the path computation result under the plan bandwidth.
Here, the request for configuring the parameter for adjusting the planned bandwidth may also be implemented separately from the request for computing the path, and after the PCC establishes the LSP, the request for configuring the parameter for adjusting the planned bandwidth may be initiated to the PCE through a PCRpt message.
The method comprises the steps that a planning bandwidth adjustment parameter is carried in a PCReq message, a PCRpt message or a PCUpd message through an LSP object, a SCHED-BW-ADJUST-ATTRIBUTE TLV is expanded in the LSP object, if the TLV exists, the LSP requests the planning bandwidth adjustment parameter configuration, and the premise is that a SCHED-BW-ADJUST-CAPABLITY bit is carried in an OPEN object of an OPEN message, and two ends (with state PCEs or PCCs) are in a set state. The format of SCHED-BW-ADJUST-attribute tlv is shown in fig. 5, and the description of the respective fields is as follows:
type: indicating that the TLV is SCHED-BW-ADJUST-ATTRIBUTE TLV, 16 bit;
length: represents the length of the present TLV, 16 bits;
starting Time: represents the starting execution time of the scheduled adjustment bandwidth, 32 bits, and the unit is minutes;
duration Time: represents the duration of the bandwidth adjustment, 32 bits, in minutes;
bandwidth: the bandwidth value representing the planned adjustment, 32 bits, has the unit of 1000 bits/s.
In the embodiment of the invention, planned bandwidth capacity notification is carried out between the stateful PCE and the PCC; a user or PCC configures a plan bandwidth adjustment parameter request to a stateful PCE; implementing PCE execution plan bandwidth adjustment flow; the method comprises the steps that a PCE (personal computer) protocol is expanded to announce a planning bandwidth adjustment capability of a stateful PCE (personal computer equipment), wherein the Open message of the PCEP protocol is expanded to carry an identification field of a planning bandwidth adjustment capability attribute;
and expanding the PCEP protocol to carry the parameter of the planned bandwidth adjustment, wherein the parameter of the planned bandwidth adjustment is carried by an LSP object in a PCReq message, a PCRpt message or a PCUpd message.
Example four
In this embodiment, an initialization process of capability exchange between a stateful PCE and a PCC provided by an embodiment of the present invention is described. As shown in fig. 6, the PCC establishes a PCEP session with the stateful PCE, between which the capability to plan bandwidth adjustment is advertised in an OPEN message. Specifically, the method comprises the following steps:
s601, the PCC sends an Open message to the PCE with the state, the message carries an OPEN object, the STATeFULL-PCE-CAPABILITY TLV is contained, bit A is set to be 1, and the PCC is informed of the capacity of receiving the adjustment of the planned bandwidth;
s602, the STATEFUL PCE sends an Open message to the PCC, wherein the message also carries an OPEN object, the STATeFULL-PCE-CAPABILITY TLV is contained, bit A is set to 1, and the STATEFUL PCE is notified to have the capacity of planning bandwidth adjustment;
s603, after receiving the Open message of PCC, the stateful PCE sends a Keepalive message to keep alive PCEP session according to the time interval defined by the Keepalive field in the Open message;
s604, after receiving the Open message of the state PCE, the PCC sends a Keepalive message according to the time interval defined by the Keepalive field in the Open message to carry out PCEP session keep-alive.
EXAMPLE five
In this embodiment, a process of initiating, by the PCC, configuration of a planned bandwidth adjustment parameter to a stateful PCE according to an embodiment of the present invention is described. As shown in fig. 7, when the PCC establishes the LSP, the PCC requests the stateful PCE to compute a path and requests configuration of a planned bandwidth adjustment parameter, specifically:
s701, the PCC sends a PCReq message to request a stateful PCE to perform path calculation under the original bandwidth and establish an LSP, wherein an LSP object comprises the expanded SCHED-BW-ADJUST-ATTRIBUTE TLV of the invention and carries a planned bandwidth adjustment parameter;
s702, after receiving the PCReq message, the stateful PCE performs path computation under the original bandwidth according to the original bandwidth, stores the original bandwidth and the plan bandwidth adjustment parameter, informs the TED to reserve resources, and sends a PCRep message to the PCC to respond to the path computation result and the resource reservation condition under the original bandwidth.
EXAMPLE six
In this embodiment, a process that a user initiates a request for configuring a planned bandwidth adjustment parameter to a stateful PCE according to an embodiment of the present invention is described. As shown in fig. 8, specifically:
s801, a user initiates a plan bandwidth adjustment parameter configuration request to a stateful PCE through an NMS or an APP of a control terminal, and the plan bandwidth adjustment parameter is carried;
s802, after receiving the request, the stateful PCE stores the scheduled bandwidth adjustment parameters locally, reserves resources, and performs resource synchronization with the PCC.
EXAMPLE seven
In this embodiment, a process of successfully adjusting the execution plan bandwidth provided in the embodiment of the present invention is described. As shown in fig. 9, specifically:
s901, when the starting time is reached, a stateful PCE performs path calculation under the planned bandwidth according to the planned bandwidth, and sends a PCUpd message carrying the path calculation result under the planned bandwidth to a PCC to initiate a bandwidth adjustment request;
s902, deleting the LSP of the original bandwidth after the PCC receives the PCUpd message, and reestablishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
S903, after the duration time is over, the stateful PCE obtains a path computation record under the original bandwidth according to the original bandwidth computation path, and sends a PCUpd message to the PCC to carry the path computation result under the original bandwidth to initiate an adjustment request of the original bandwidth;
and S904, deleting the LSP under the planned bandwidth after the PCC receives the PCUpd message, and reestablishing the LSP under the original bandwidth according to the path calculation result under the original bandwidth.
Example eight
In this embodiment, a process of failing to perform scheduled bandwidth adjustment in the method for failing to perform scheduled bandwidth adjustment provided in the embodiment of the present invention is described. As shown in fig. 10, specifically: :
s1001, when the starting time is reached, the stateful PCE performs path calculation under the planned bandwidth according to the planned bandwidth, and sends a PCUpd message carrying a path calculation result under the planned bandwidth to the PCC to initiate a planned bandwidth adjustment request;
s1002, after receiving the PCUpd message, the PCC fails to adjust the bandwidth, and notifies the stateful PCE of the failure of adjusting the bandwidth by responding to the PCErr message to the stateful PCE.
Example nine
In order to implement the method for performing a scheduled bandwidth adjustment provided in the first embodiment, this embodiment provides an apparatus for performing a scheduled bandwidth adjustment, as shown in fig. 11, where the apparatus includes: a parameter configuration unit 1101 and an adjustment unit 1102; wherein,
a parameter configuration unit 1101, configured to receive, by a stateful path computation element PCE through protocol extension, a planned bandwidth adjustment parameter including a planned bandwidth sent by a path plan client PCC, or receive a planned bandwidth adjustment parameter including a planned bandwidth sent by a network management system NMS and a control terminal;
an adjusting unit 1102, configured to perform a planned bandwidth adjustment according to the planned bandwidth adjustment parameter, so as to determine a label switched path LSP under the planned bandwidth.
The adjusting unit 1102 is specifically configured to: and when the time reaches the starting time in the plan adjustment parameters, performing path calculation according to the plan bandwidth to obtain a path calculation result under the plan bandwidth so as to determine the LSP under the plan bandwidth.
As shown in fig. 12, the apparatus further includes: a first sending unit 1103 configured to: sending a planned bandwidth adjustment capability identifier to the PCC through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
The device further comprises: a first receiving unit 1104, configured to: receiving an acceptance plan bandwidth adjustment capacity identification sent by the PCC through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
In an embodiment of the present invention, the apparatus further includes: a resource notification unit 1105 configured to: after receiving a planned bandwidth adjustment parameter including a planned bandwidth sent by PCC through protocol extension, storing the planned bandwidth adjustment parameter, and informing a TED to reserve resources to determine a resource reservation result; and sending the resource reservation result to the PCC through protocol extension.
The device further comprises: an indicating unit 1106, configured to: and sending the path calculation result under the planned bandwidth to the PCC through protocol extension to indicate the PCC to delete the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
Example ten
In order to implement the method for performing a scheduled bandwidth adjustment provided in the second embodiment, this embodiment provides an apparatus for performing a scheduled bandwidth adjustment, as shown in fig. 13, where the apparatus includes: a parameter sending unit 1301, configured to send, by the PCC, a planned bandwidth adjustment parameter including a planned bandwidth to the stateful path computation unit PCE through a protocol extension; and the plan bandwidth adjustment parameter is used for the PCE to perform plan bandwidth adjustment according to the plan adjustment parameter so as to determine a Label Switched Path (LSP) under the plan bandwidth.
As shown in fig. 14, the apparatus further includes: a second sending unit 1302, configured to: receiving a planned bandwidth adjustment capacity identification sent by the stateful PCE through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
The device further comprises: a second receiving unit 1303 configured to: sending an acceptance plan bandwidth adjustment capability identifier to the stateful PCE through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
The device further comprises: an LSP adjustment unit 1304 configured to: receiving a path calculation result under the planned bandwidth sent by the stateful PCE through protocol extension; and deleting the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
When a logic Unit is added to the stateful PCE, the parameter configuration Unit 1101, the adjustment Unit 1102, the first sending Unit 1103, the first receiving Unit 1104, the resource notification Unit 1105 and the indication Unit 1106 may be implemented by a Central Processing Unit (CPU), a Digital Signal Processor (DSP), or a Programmable Gate Array (FPGA) located in the stateful PCE.
When a logic unit is added to the PCC, the parameter sending unit 1301, the second sending unit 1302, the second receiving unit 1303, and the LSP adjustment unit 1304 may be implemented by a CPU, a DSP, or an FPGA located in the PCC.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of a hardware embodiment, a software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention.

Claims (20)

1. A method for making planned bandwidth adjustments, the method comprising:
a stateful path computation element PCE receives a planned bandwidth adjustment parameter which is sent by a path plan client PCC and comprises a planned bandwidth through protocol extension, or receives a planned bandwidth adjustment parameter which is sent by a network management system NMS and a control terminal and comprises a planned bandwidth;
and carrying out plan bandwidth adjustment according to the plan bandwidth adjustment parameters to determine the Label Switching Path (LSP) under the plan bandwidth.
2. The method of claim 1, further comprising:
sending a planned bandwidth adjustment capability identifier to the PCC through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
3. The method of claim 1, further comprising:
receiving an acceptance plan bandwidth adjustment capacity identification sent by the PCC through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
4. The method of claim 1, wherein after receiving, via the protocol extension, the planned bandwidth adjustment parameter comprising the planned bandwidth sent by the PCC, the method further comprises:
saving the plan bandwidth adjustment parameter and informing the TED to reserve resources to determine a resource reservation result; and sending the resource reservation result to the PCC through protocol extension.
5. The method of claim 1, wherein the performing a planned bandwidth adjustment according to the planned bandwidth adjustment parameter to determine the LSP at the planned bandwidth comprises:
and when the time reaches the starting time in the plan adjustment parameters, performing path calculation according to the plan bandwidth to obtain a path calculation result under the plan bandwidth so as to determine the LSP under the plan bandwidth.
6. The method of claim 5, further comprising:
and sending the path calculation result under the planned bandwidth to the PCC through protocol extension to indicate the PCC to delete the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
7. A method for making planned bandwidth adjustments, the method comprising:
a path plan client PCC sends a plan bandwidth adjustment parameter comprising a plan bandwidth to a stateful path computation element PCE through a protocol extension; and the plan bandwidth adjustment parameter is used for the PCE to perform plan bandwidth adjustment according to the plan adjustment parameter so as to determine a Label Switched Path (LSP) under the plan bandwidth.
8. The method of claim 7, further comprising:
receiving a planned bandwidth adjustment capacity identification sent by the stateful PCE through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
9. The method of claim 7, further comprising:
sending an acceptance plan bandwidth adjustment capability identifier to the stateful PCE through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
10. The method of claim 7, further comprising:
receiving a path calculation result under the planned bandwidth sent by the stateful PCE through protocol extension;
and deleting the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
11. An apparatus for making scheduled bandwidth adjustments, the apparatus comprising: a parameter configuration unit and an adjustment unit; wherein,
the parameter configuration unit is used for the stateful path computation element PCE to receive the planned bandwidth adjustment parameters including the planned bandwidth sent by the path plan client PCC through protocol extension, or to receive the planned bandwidth adjustment parameters including the planned bandwidth sent by the network management system NMS and the control terminal;
and the adjusting unit is used for performing planned bandwidth adjustment according to the planned bandwidth adjustment parameter so as to determine a Label Switched Path (LSP) under the planned bandwidth.
12. The apparatus of claim 11, further comprising: a first sending unit configured to: sending a planned bandwidth adjustment capability identifier to the PCC through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
13. The apparatus of claim 11, further comprising: a first receiving unit configured to:
receiving an acceptance plan bandwidth adjustment capacity identification sent by the PCC through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
14. The apparatus of claim 11, further comprising: a resource notification unit configured to:
after receiving a planned bandwidth adjustment parameter including a planned bandwidth sent by PCC through protocol extension, storing the planned bandwidth adjustment parameter, and informing a TED to reserve resources to determine a resource reservation result;
and sending the resource reservation result to the PCC through protocol extension.
15. The apparatus according to claim 11, wherein the adjusting unit is specifically configured to:
and when the time reaches the starting time in the plan adjustment parameters, performing path calculation according to the plan bandwidth to obtain a path calculation result under the plan bandwidth so as to determine the LSP under the plan bandwidth.
16. The apparatus of claim 15, further comprising: an indication unit configured to:
and sending the path calculation result under the planned bandwidth to the PCC through protocol extension to indicate the PCC to delete the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
17. An apparatus for making scheduled bandwidth adjustments, the apparatus comprising: a parameter sending unit, configured to send, by the PCC, a planned bandwidth adjustment parameter including a planned bandwidth to the stateful path computation element PCE through a protocol extension; and the plan bandwidth adjustment parameter is used for the PCE to perform plan bandwidth adjustment according to the plan adjustment parameter so as to determine a Label Switched Path (LSP) under the plan bandwidth.
18. The apparatus of claim 17, further comprising: a second transmitting unit configured to:
receiving a planned bandwidth adjustment capacity identification sent by the stateful PCE through protocol extension; wherein the planned bandwidth adjustment capability identifies a capability for characterizing whether the stateful PCE has planned bandwidth adjustment.
19. The apparatus of claim 17, further comprising: a second receiving unit configured to:
sending an acceptance plan bandwidth adjustment capability identifier to the stateful PCE through protocol extension; wherein the accept planned bandwidth adjustment capability identifies whether the PCC has an ability to accept planned bandwidth adjustments.
20. The apparatus of claim 17, further comprising: an LSP adjustment unit to:
receiving a path calculation result under the planned bandwidth sent by the stateful PCE through protocol extension;
and deleting the LSP under the original bandwidth, and establishing the LSP under the planned bandwidth according to the path calculation result under the planned bandwidth.
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