CN109962850B - Method and controller for implementing segment routing and computer readable storage medium - Google Patents
Method and controller for implementing segment routing and computer readable storage medium Download PDFInfo
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- 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
- H04L45/12—Shortest path evaluation
- H04L45/123—Evaluation of link metrics
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- 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]
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- 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
- H04L45/74—Address processing for routing
- H04L45/745—Address table lookup; Address filtering
- H04L45/748—Address table lookup; Address filtering using longest matching prefix
Abstract
The disclosure discloses a method for realizing segmented routing, a controller and a computer readable storage medium, and relates to the field of communication. The method comprises the following steps: the controller determines a destination node of a data packet or an exit node in the management domain according to a destination address of the data packet arriving at an entry node of the management domain; determining a forwarding path of a data packet in a management domain according to an entrance node and by combining a destination node or an exit node; forming forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path; and sending the forwarding label stack information of the forwarding path to the ingress node so as to forward the data packet to a destination node or an egress node according to the forwarding label stack information of the forwarding path. The implemented segment routing scheme is relatively simple to implement relative to conventional segment routing schemes.
Description
Technical Field
The present disclosure relates to the field of communications, and in particular, to a method and a controller for implementing segment routing, and a computer-readable storage medium.
Background
The Segment Routing (SR) technology is a Label forwarding technology similar to Multi-Protocol Label Switching (MPLS), and the technology realizes data forwarding by searching a Label forwarding table. Two types of segment labels are currently defined, address Prefix labels (Prefix-SID) and adjacency labels (Adj-SID). The address prefix tag has global uniqueness. The adjacency label is valid only locally.
In the existing method for implementing the segment routing, each node needs to notify its own address prefix label to other nodes through an Interior Gateway Protocol (IGP) Protocol, and each node looks up an address prefix label corresponding to a destination IP address according to a routing table and then obtains forwarding label stack information according to a source routing manner. The method is relatively complex.
Disclosure of Invention
One technical problem to be solved by the embodiments of the present disclosure is: the existing method for realizing the segmented routing is relatively complex.
One aspect of the present disclosure provides a method for implementing segment routing, including: the controller determines a destination node of a data packet or an exit node in a management domain according to a destination address of the data packet arriving at an entry node of the management domain; determining a forwarding path of the data packet in the management domain according to the ingress node in combination with the destination node or the egress node; forming forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path; and sending the forwarding label stack information of the forwarding path to the ingress node so as to forward the data packet to the destination node or the egress node according to the forwarding label stack information of the forwarding path.
Optionally, the method further comprises: the controller assigns an address prefix tag to each node in the administrative domain.
Optionally, the controller allocates an address prefix tag to each node in the management domain by using a flow table, wherein a header field of the flow table is added with a segment routing protocol field, and an action field of the flow table is added with a type used for indicating that a segment routing tag is allocated and an address prefix tag used for indicating that a value corresponding to the type is allocated.
Optionally, the controller sends forwarding label stack information of the forwarding path to the ingress node by using a flow table, where a header field of the flow table is added with a segment routing protocol field, and an action field of the flow table is added with a type used for indicating segment routing data forwarding and forwarding label stack information used for indicating that a value corresponding to the type is the forwarding path.
Optionally, determining the forwarding path of the data packet in the management domain is further according to a network status.
Yet another aspect of the present disclosure provides a controller for implementing segment routing, including: a node determining module, configured to determine a destination node of a data packet or an exit node in a management domain according to a destination address of the data packet arriving at an entry node of the management domain; a path determining module, configured to determine, according to the ingress node and in combination with the destination node or the egress node, a forwarding path of the packet in the management domain; a label stack determining module, configured to form forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path; a sending module, configured to send forwarding label stack information of the forwarding path to the ingress node, so as to forward the data packet to the destination node or the egress node according to the forwarding label stack information of the forwarding path.
Optionally, the controller further comprises: and the label allocation module is used for allocating an address prefix label to each node in the management domain by using a flow table, wherein a segment routing protocol field is added to a header field of the flow table, and a type used for indicating that the segment routing label is allocated and an address prefix label used for indicating that a value corresponding to the type is allocated are added to an action field of the flow table.
Optionally, the sending module is configured to send forwarding label stack information of the forwarding path to the ingress node by using a flow table, where a segment routing protocol field is added to a header field of the flow table, and a type used to represent forwarding of segment routing data and a value corresponding to the type are added to an action field of the flow table, where the forwarding label stack information is used to represent that the type is the forwarding label stack information of the forwarding path.
Yet another aspect of the present disclosure provides a controller for implementing segment routing, including: a memory; and a processor coupled to the memory, the processor configured to perform the aforementioned method of implementing segment routing based on instructions stored in the memory.
Another aspect of the present disclosure proposes a computer-readable storage medium on which a computer program is stored, which when executed by a processor implements the aforementioned method of implementing segment routing.
According to the method, the controller forms forwarding label stack information of a forwarding path of the data packet and sends the forwarding label stack information to the entry node in the management domain, so that the entry node forwards the data packet according to the forwarding label stack information, and compared with a traditional segmented routing scheme, the implemented segmented routing scheme is simple to implement. In addition, the controller allocates the address prefix label to each node in the management domain, and unified management of the address prefix labels is realized.
Drawings
The drawings that will be used in the description of the embodiments or the related art will be briefly described below. The present disclosure will be more clearly understood from the following detailed description, which proceeds with reference to the accompanying drawings,
it is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without undue inventive faculty.
Fig. 1 is a schematic diagram of a network structure for implementing segment routing according to the present disclosure.
Figure 2 illustrates one example of an OpenFlow flow table improved by the present disclosure.
Fig. 3 is a flowchart of an embodiment of a method for implementing segment routing according to the present disclosure.
Fig. 4 is a schematic structural diagram of an embodiment of a controller for implementing segment routing according to the present disclosure.
Fig. 5 is a schematic structural diagram of a controller for implementing segment routing according to still another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure.
The present disclosure provides a scheme for implementing segment routing based on a controller. In the scheme, the controller is used for uniformly managing the address prefix labels in the management domain to form forwarding label stack information and sending the forwarding label stack information to the nodes in the management domain.
Fig. 1 is a schematic diagram of a network structure for implementing segment routing according to the present disclosure. As shown in fig. 1, one management domain includes a controller and several nodes. Five nodes identified as R1, R2, R3, R4, and R5 are shown in fig. 1 by way of example. The nodes are communicated through physical connection. The controller is communicated with the nodes through control channels. If the controller is an SDN (Software Defined Network) controller, a control channel between the SDN controller and the node may be an OpenFlow interface. The nodes may be network devices such as routers or switches, for example.
The controller may assign an address prefix label to each node in the administrative domain, thereby enabling unified management of the address prefix labels. One example of a node and its assigned address prefix tag is shown in table 1. The address prefix label assigned by the controller can be sent to the node through the control channel.
TABLE 1
| Node point | Address prefix label |
| R1 | 11 |
| R2 | 12 |
| |
13 |
| R4 | 14 |
| R5 | 15 |
In one embodiment, the OpenFlow interface is improved. The controller may assign an address prefix tag to each node in the administrative domain using a modified OpenFlow flow table.
Figure 2 shows one example of an improved OpenFlow flow table. As shown in fig. 2, each flow entry of the OpenFlow flow table is composed of 3 parts, including a Header field (headers Fields) for packet matching, a counter (Counters) for counting the number of matching packets, and Actions (Actions) indicating how the matching packets are processed.
A Segment Routing (SR) protocol field is added in the header field. Also included in the header field are existing fields such as switch ingress port, source MAC (media access control), destination MAC, ethernet type, VLAN (virtual local area network) identification, VLAN priority, source IP, destination IP, IP protocol fields, IP service type.
The action field of the OpenFlow flow table includes a field Type (Type), a length (Len), and a Value (Value). The address prefix label is assigned by adding a Type (Type1) indicating that a segment routing label is assigned and a Value (Value1) indicating that the Type corresponds to the Type to the assigned address prefix label in the action field of the OpenFlow flow table.
The Type (Type1) and Value (Value1) of action field addition are for example:
type 1: assigning segment routing labels
Value 1: address prefix label
Fig. 3 is a flowchart of an embodiment of a method for implementing segment routing according to the present disclosure. As shown in fig. 3, the method of this embodiment includes:
in step 310, the controller determines a destination node of the packet or an egress node in the management domain according to a destination address of the packet arriving at the ingress node of the management domain.
If the destination address of the data packet is not in the management domain, the exit node of the data packet in the management domain is determined.
For example, a packet arrives at the ingress node R1 of the administrative domain, and the controller determines R4 to be the destination node or egress node based on the destination address of the packet.
In step 320, the controller determines a forwarding path of the data packet in the management domain according to the ingress node and in combination with the destination node or the egress node. A forwarding path enables a data packet to reach a destination node or an egress node from an ingress node.
In addition, the forwarding path of the data packet in the management domain can be determined according to the network state. The network status includes, for example, bandwidth or load. For example, among communication paths between an ingress node and a destination node (or an egress node), a communication path with an optimal network state is selected as a forwarding path of a packet. For example, the communication path with the widest bandwidth or the lightest load is selected as the forwarding path of the data packet.
In step 330, the controller forms forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path.
For example, referring to the forwarding path shown in fig. 1 and the address prefix labels of the nodes shown in table 1, the forwarding label stack information of the formed forwarding path is shown in table 2.
TABLE 2
| Forwarding |
| 11 |
| 12 |
| 15 |
| 14 |
In step 340, the controller sends the forwarding label stack information of the forwarding path to the ingress node.
In one embodiment, the OpenFlow interface is improved. The controller may send forwarding label stack information of the forwarding path to the ingress node using the modified OpenFlow flow table.
An example of an improved OpenFlow flow table is shown with reference to figure 2. The header field of the flow table is added with a segment routing protocol field, and the action field of the flow table is added with a Type (Type2) for indicating the segment routing data forwarding and forwarding label stack information for indicating that a Value (Value2) corresponding to the Type is a forwarding path.
The Type (Type2) and Value (Value2) of action field addition are for example:
type 2: segmented routing data forwarding
Value 2: forwarding label stack information (as shown in Table 2)
And step 350, the ingress node and other nodes in the forwarding path forward the data packet to the destination node or the egress node according to the forwarding label stack information of the forwarding path.
For example, the ingress node R1 performs SR encapsulation on a corresponding data packet according to the forwarding label stack information, and sends the data packet to the next-hop node R2 according to the forwarding label stack information, after receiving the SR encapsulated data packet, the next-hop node R2 sends the data packet to the next-hop node R5 according to the forwarding label stack information, and after receiving the SR encapsulated data packet, the next-hop node R5 sends the data packet to the destination node R4 or the egress node R4 according to the forwarding label stack information.
In the above embodiment, the controller forms forwarding label stack information of a forwarding path of the data packet and sends the forwarding label stack information to the ingress node in the management domain, so that the ingress node forwards the data packet according to the forwarding label stack information.
Fig. 4 is a schematic structural diagram of an embodiment of a controller for implementing segment routing according to the present disclosure. As shown in fig. 4, the controller 40 includes:
a node determining module 410, configured to determine a destination node of a data packet or an egress node in the management domain according to a destination address of the data packet arriving at an ingress node of the management domain;
a path determining module 420, configured to determine, according to an ingress node and in combination with a destination node or an egress node, a forwarding path of a packet in a management domain;
a label stack determining module 430, configured to form forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path; and
the sending module 440 is configured to send the forwarding label stack information of the forwarding path to the ingress node, so as to forward the data packet to the destination node or the egress node according to the forwarding label stack information of the forwarding path.
Optionally, the sending module 440 is configured to send forwarding label stack information of the forwarding path to the ingress node by using the flow table, where a header field of the flow table is added with a segment routing protocol field, and an action field of the flow table is added with a type used to represent forwarding of segment routing data and forwarding label stack information used to represent a value corresponding to the type as the forwarding path.
The controller forms forwarding label stack information of a forwarding path of the data packet and sends the forwarding label stack information to the entry node in the management domain, so that the entry node forwards the data packet according to the forwarding label stack information.
Optionally, the controller further comprises: a label allocating module 400, configured to allocate an address prefix label to each node in the management domain by using the flow table, where a segment routing protocol field is added to a header field of the flow table, and a type used to indicate that the segment routing label is allocated and an address prefix label used to indicate that a value corresponding to the type is allocated are added to an action field of the flow table.
The controller allocates the address prefix label to each node in the management domain, and unified management of the address prefix labels is achieved.
Fig. 5 is a schematic structural diagram of a controller for implementing segment routing according to still another embodiment of the present disclosure. As shown in fig. 5, the controller 50 includes: a memory 510 and a processor 520 coupled to the memory 510, the processor 520 being configured to perform a method of implementing segment routing in any of the foregoing embodiments based on instructions stored in the memory 510.
The controller 50 may also include an input-output interface 530, a network interface 540, a storage interface 550, and the like. These interfaces 530, 540, 550 and the connections between the memory 510 and the processor 520 may be, for example, via a bus 560. The input/output interface 530 provides a connection interface for input/output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface 540 provides a connection interface for various networking devices. The storage interface 550 provides a connection interface for external storage devices such as an SD card and a usb disk.
The present disclosure also proposes a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the aforementioned method of implementing segment routing.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. 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 exemplary of the present disclosure and is not intended to limit the present disclosure, so that any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure.
Claims (8)
1. A method of implementing segment routing, comprising:
the controller determines a destination node of a data packet or an exit node in a management domain according to a destination address of the data packet arriving at an entry node of the management domain;
the controller determines a forwarding path of the data packet in the management domain according to the ingress node and in combination with the destination node or the egress node;
the controller forms forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path;
the controller sends forwarding label stack information of the forwarding path to the ingress node by using a flow table so as to forward the data packet to the destination node or the egress node according to the forwarding label stack information of the forwarding path, a segment routing protocol field is added to a header field of the flow table, and a type used for representing segment routing data forwarding and forwarding label stack information used for representing a value corresponding to the type as the forwarding path are added to an action field of the flow table.
2. The method of claim 1, further comprising:
the controller assigns an address prefix tag to each node in the administrative domain.
3. The method of claim 2, wherein the controller assigns an address prefix tag to each node in the administrative domain using a flow table,
the flow table comprises a header field, an action field and a fragment routing protocol field, wherein the header field of the flow table is added with a fragment routing protocol field, and the action field of the flow table is added with a type for indicating that a fragment routing label is allocated and an address prefix label for indicating that a value corresponding to the type is allocated.
4. The method of claim 1, wherein determining the forwarding path of the packet at the administrative domain is further based on a network status.
5. A controller that implements segment routing, comprising:
a node determining module, configured to determine a destination node of a data packet or an exit node in a management domain according to a destination address of the data packet arriving at an entry node of the management domain;
a path determining module, configured to determine, according to the ingress node and in combination with the destination node or the egress node, a forwarding path of the packet in the management domain;
a label stack determining module, configured to form forwarding label stack information of the forwarding path according to the address prefix label of each node in the forwarding path;
a sending module, configured to send forwarding label stack information of the forwarding path to the ingress node by using a flow table, so as to forward the data packet to the destination node or the egress node according to the forwarding label stack information of the forwarding path, where a segment routing protocol field is added to a header field of the flow table, and a type used to represent segment routing data forwarding and forwarding label stack information used to represent a value corresponding to the type as the forwarding path are added to an action field of the flow table.
6. The controller of claim 5, further comprising:
and the label allocation module is used for allocating an address prefix label to each node in the management domain by using a flow table, wherein a segment routing protocol field is added to a header field of the flow table, and a type used for indicating that the segment routing label is allocated and an address prefix label used for indicating that a value corresponding to the type is allocated are added to an action field of the flow table.
7. A controller that implements segment routing, comprising: a memory; and a processor coupled to the memory, the processor configured to perform the method of implementing segment routing of any of claims 1-4 based on instructions stored in the memory.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of carrying out segment routing according to any one of claims 1 to 4.
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| CN112565076A (en) * | 2019-09-10 | 2021-03-26 | 中国电信股份有限公司 | Method, device and system for forwarding critical path information based on ISIS protocol |
| CN112565084A (en) * | 2019-09-10 | 2021-03-26 | 中国电信股份有限公司 | PCEP-based critical path information forwarding method, device and system |
| CN110460507A (en) * | 2019-09-11 | 2019-11-15 | 赛尔网络有限公司 | Service bearer method, apparatus |
| CN113395206B (en) * | 2020-03-13 | 2023-06-02 | 华为技术有限公司 | Route determining method, device and network equipment |
| CN116192726A (en) * | 2020-03-20 | 2023-05-30 | 华为技术有限公司 | Forwarding path establishment method, forwarding path establishment device and computer readable storage medium |
| CN111431800B (en) * | 2020-03-20 | 2022-07-12 | 新华三技术有限公司合肥分公司 | Method, device and equipment for establishing path and machine-readable storage medium |
| CN112787926A (en) * | 2021-01-05 | 2021-05-11 | 北京信息科技大学 | Device, method and system for segmented routing of interest packets |
| CN114257587A (en) * | 2021-11-05 | 2022-03-29 | 浙江大丰实业股份有限公司 | Stage cloud service platform based on 5G technology |
| CN114520839A (en) * | 2022-02-23 | 2022-05-20 | 河北稳控科技有限公司 | Data forwarding method, controller and data forwarding equipment |
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