CN107770071B - OpenFlow-based MPLS message processing method and device - Google Patents
OpenFlow-based MPLS message processing method and device Download PDFInfo
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- CN107770071B CN107770071B CN201710975768.4A CN201710975768A CN107770071B CN 107770071 B CN107770071 B CN 107770071B CN 201710975768 A CN201710975768 A CN 201710975768A CN 107770071 B CN107770071 B CN 107770071B
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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
- H04L45/50—Routing or path finding of packets in data switching networks using label swapping, e.g. multi-protocol label switch [MPLS]
- H04L45/507—Label distribution
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Abstract
The invention discloses an OpenFlow-based MPLS message forwarding method and device, wherein the method comprises the steps of carrying out label searching on a received MPLS message, judging whether the MPLS message is in an OpenFlow mode or not according to the searched label configuration, if so, determining an initial position and the number of deleted labels according to the label configuration, and judging whether to carry out next label searching or not according to the label configuration; if not, judging whether to search for the next label directly according to the label configuration; if the label needs to be searched, searching the next label; and finally, forwarding the MPLS message. The invention can flexibly add or delete the label of the MPLS message label stack, and can meet more variable user requirements.
Description
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to an OpenFlow-based MPLS packet processing method and apparatus.
Background
MPLS (Multi-Protocol Label Switching) is a new generation of IP high-speed backbone network Switching standard. MPLS uses labels (labels) for data forwarding. When a packet enters a network, a short label with a fixed length is allocated to the packet, the label and the packet are packaged together, and a switching node only forwards the packet according to the label in the whole forwarding process.
In the forwarding process, a plurality of labels may need to be added or deleted, and when the labels are deleted, the external two-layer header needs to be stripped off, so that the forwarding rate of the message is reduced.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides an OpenFlow-based MPLS message forwarding method and device, which can flexibly add or delete MPLS labels.
In order to achieve the purpose, the invention provides the following technical scheme: an OpenFlow-based MPLS message forwarding method comprises the following steps:
step S1, label searching is carried out on the MPLS message;
step S2, judging whether the MPLS message is in an OpenFlow mode according to the found label configuration, if so, determining an initial position and the number of the deleted labels according to the label configuration, and continuing to execute the step S3; if not, directly executing step S3;
step S3, judging whether to search for the next label according to the label configuration, if so, executing the step S1-S2; if not, go to step S4;
step S4, forwarding the MPLS packet.
Preferably, in step S4, the MPLS packet forwarding process includes the following steps:
step S401, obtaining MPLS message outlet information;
step S402, deleting labels from the initial position according to the number of the deleted labels;
step S403, judging whether a new label needs to be added to the MPLS message according to the label configuration, if so, adding a plurality of MPLS labels from the initial position, and executing step S404; if not, modifying the Ethernet type according to the header type of the internal message after deleting the MPLS label, and executing the step S404;
and S404, modifying the content of the header of the second layer according to the label configuration, and forwarding the message.
Preferably, in step S301, the Label configuration includes an OF Mode field, a Continue field, a Pop Label NO field, and an Offset field, where the OF Mode field is used to mark whether the MPLS packet is in an OpenFlow Mode; the Continue field is used for marking whether to search for the next label; the Pop Label NO field is used for marking the number of labels needing to be deleted; the Offset field is used to mark where to begin deleting the tag.
Preferably, setting the Continue field to 1 indicates that the next tag lookup needs to be performed, and setting the Continue field to 0 indicates that the next tag lookup does not need to be performed.
Preferably, the internal packet header types include an IPv4 header, an IPv6 header, and an ethernet header.
An MPLS message forwarding device based on OpenFlow comprises
The MPLS label searching module is used for searching labels of the MPLS messages;
the MPLS label processing module is used for processing the MPLS message according to the searched label configuration; and
and the MPLS message forwarding module is used for forwarding the message.
Preferably, the MPLS label processing module includes a label forwarding information base module and a judgment processing module, and the label forwarding information base module is configured to store a plurality of label configurations; and the judgment processing module is used for determining whether the MPLS message is in an OpenFlow mode according to the label configuration, determining the number and the initial position of the deleted labels, and determining whether to search for the next label.
Preferably, the Label configuration includes an OF Mode field, a Continue field, a Pop Label NO field, and an Offset field, where the OF Mode field is used to mark whether the MPLS packet is in an OpenFlow Mode; the Continue field is used for marking whether to search for the next label; the Pop Label NO field is used for marking the number of labels needing to be deleted; the Offset field is used to mark where to begin deleting the tag.
Preferably, the Continue field is set to 1 to indicate that the next tag lookup needs to be performed; a set to 0 indicates that no next tag lookup is required.
Preferably, the message forwarding processing module includes
A message export information obtaining module, configured to obtain MPLS message export information;
the label adding and deleting module is used for adding or deleting labels to the MPLS messages and modifying the Ethernet type; and
and the second-layer header modification module is used for modifying the second-layer header of the MPLS message.
The invention has the beneficial effects that:
the method and the device for forwarding the MPLS message based on the OpenFlow not only can flexibly add or delete the label of the MPLS message label stack, but also can flexibly edit the two-layer header of the MPLS message, and do not need to decapsulate the MPLS message according to the existing protocol and then encapsulate the MPLS message.
Drawings
FIG. 1 is a flow chart diagram of an MPLS message processing method of the present invention;
FIG. 2 is a diagrammatic illustration of the forwarding process flow of the present invention;
FIG. 3 is a schematic view of an MPLS message processing flow of the present invention;
fig. 4 is a block diagram illustrating a structure of an MPLS packet forwarding apparatus according to the present invention.
Detailed Description
The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.
The method and the device for processing the MPLS message based on the OpenFlow not only can flexibly add or delete the label of the MPLS message, but also can flexibly edit the two-layer header of the MPLS message.
With reference to fig. 1 and fig. 3, an OpenFlow-based MPLS packet processing method includes the following steps:
step S1, label searching is carried out on the received MPLS message;
step S2, judging whether the MPLS message is in an OpenFlow mode according to the found label configuration, if so, determining the number and the initial position of the deleted labels according to the label configuration, and continuing to execute the step S3; if not, step S3 is executed directly. Wherein the start position is used to indicate where to start deleting the tag.
Specifically, the MPLS domain includes a plurality of LSRs (Label Switch routers), and each LSR includes an LFIB (Label Forwarding Information Base) for Forwarding a packet with a Label (Label). The LFIB includes several entries, each entry including an incoming label and a label configuration. The label configuration is used for configuring how to process the message.
Further, the tag configuration includes an OF Mode field, a Continue field, a Pop Label NO field, and an Offset field. The OF Mode field is used for marking whether the MPLS message is in an OpenFlow Mode; the Continue field is used for marking whether to search for the next label; the Pop Label NO field is used for marking the number of labels needing to be deleted; the Offset field is used to determine the starting position of the delete tag, marking where to start deleting the tag.
Step S3, judging whether to search for the next label according to the label configuration, if so, executing the step S1-S2; if not, step S4 is executed.
As described above, a Continue field is set in the tag configuration, and when the Continue field is set to 1, it indicates that the next tag lookup needs to be performed; when the Continue field is set to 0, it indicates that the next tag lookup is not needed.
Step S4, forwarding the MPLS packet.
Specifically, as shown in fig. 2 and fig. 3, the packet forwarding process includes obtaining MPLS packet egress information, where the MPLS packet egress information includes a forwarding port, a next hop address, and the like. After obtaining the export information of the MPLS message, editing the MPLS message according to the initial position and the number of the deleted labels, namely, keeping the data information before the initial position in the MPLS message, wherein the data information comprises a two-layer head and the MPLS labels which do not need to be deleted before the initial position. Of course, depending on the setting of the Pop Label NO field and the Offset field, the Label may not be deleted or may be deleted from the first MPLS Label.
After the MPLS packet egress information is obtained and the unnecessary label is deleted, the MPLS packet needs to be forwarded to the next LSR or directly forwarded from the LSR according to the label configuration. In LSR, judging whether to add new label for MPLS message according to label configuration, if so, adding several MPLS labels according to initial position and modifying Ethernet type; if the addition is not needed, modifying the Ethernet type according to the type of the internal message header after deleting the MPLS label, wherein the type of the internal message header is IPv4, IPv6, Ethernet and the like; and further, modifying the content of the header of the second layer according to the label configuration, and finally forwarding the message.
As shown in fig. 4, an OpenFlow-based MPLS packet forwarding apparatus includes an MPLS label lookup module, an MPLS label processing module, and an MPLS packet forwarding module. The MPLS device comprises an MPLS label searching module, an MPLS label processing module and a label matching module, wherein the MPLS label searching module is used for searching the label of the MPLS message, and the MPLS label processing module is used for processing the MPLS message according to the searched label configuration; the MPLS message forwarding module is used for forwarding messages.
Specifically, the MPLS label processing module includes a label forwarding information base module and a judgment processing module. The label forwarding information base is used for storing a plurality of items; and the judgment processing module is used for determining whether the MPLS message is in an OpenFlow mode according to the label configuration, determining the number and the initial position of the deleted labels, and determining whether to search for the next label. Further, each entry includes an incoming tag and a tag configuration. The label configuration is used for configuring how to process the message. Further, the tag configuration includes that the tag configuration includes an OF Mode field, a Continue field, a Pop Label NO field, and an Offset field. The OF Mode field is used for marking whether the MPLS message is in an OpenFlow Mode; the Continue field is used for marking whether to search for the next label; the Pop Label NO field is used for marking the number of labels needing to be deleted; the Offset field is used to mark where to begin deleting the tag.
After the MPLS Label searching module searches corresponding Label configuration according to the Label in the MPLS message, the judging module judges whether the Label configuration is an OpenFlow Mode or not according to the OF Mode field in the Label configuration, determines the number OF the deleted labels according to the Pop Label NO, determines the initial position according to the Offset field, and determines whether the next Label searching is carried out or not according to the context field. In this embodiment, when the value in the Continue field is 1, it indicates that the next tag search needs to be performed; a value of 0 indicates that no next tag lookup is required.
The MPLS message forwarding module comprises an exit information acquisition module, a label adding and deleting module and a two-layer head modification module. The system comprises an exit information acquisition module, a forwarding module and a forwarding module, wherein the exit information acquisition module is used for acquiring MPLS message exit information, and the MPLS message exit information comprises a forwarding port, a next hop address and the like; the label adding and deleting module is used for adding or deleting labels to the MPLS message and modifying the Ethernet type, wherein the Ethernet type is modified according to the type of the head of the internal message after deleting the MPLS labels, and the types of the head of the internal message are IPv4, IPv6, Ethernet and the like; the two-layer header modification module is used for modifying the two-layer header of the MPLS message.
In this embodiment, the second-layer header modification module may select whether to modify the second-layer header according to a requirement, that is, the second-layer header is maintained in an original state when not modified, and the second-layer header is modified when modified. When the second-layer header is kept in the original state, the deletion tag is deleted through Offset, and the external second-layer header is not deleted, so that the second-layer header does not need to be reorganized or modified by using chip resources, and the table entry resources of the chip are effectively saved. If the two-layer header needs to be modified, the invention modifies the two-layer header through a two-layer header modification module, including modification of the relevant message contents of MACDa, MACSa and VLAN.
In LSR, judging whether to add new label for MPLS message according to label configuration, if so, a label adding and deleting module starts to add a plurality of MPLS labels according to the initial position and modifies the Ethernet type; if the addition is not needed, modifying the Ethernet type according to the header information of the current MPLS message; furthermore, the two-layer header modification module modifies the contents of the two-layer header according to the label configuration, and finally forwards the message. The MPLS message header information comprises an IPv4 header, an IPv6 header and an Ethernet header.
The invention can flexibly add or delete labels, edit the header of the two-layer message and the like to the MPLS message without decapsulating and then encapsulating the MPLS message according to the existing protocol.
Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.
Claims (7)
1. An OpenFlow-based MPLS message forwarding method is characterized by comprising the following steps:
step S1, label searching is carried out on the MPLS message;
step S2, judging whether the MPLS message is in an OpenFlow mode according to the found label configuration, if so, determining an initial position and the number of the deleted labels according to the label configuration, and continuing to execute the step S3; if not, directly executing step S3;
step S3, judging whether to search for the next label according to the label configuration, if so, executing the steps S1-S2; if not, go to step S4;
step S4, the forwarding processing of the MPLS packet includes the following steps: step S401, obtaining MPLS message outlet information; step S402, deleting labels from the initial position of the MPLS message according to the number of the deleted labels and reserving data information before the initial position in the MPLS message, wherein the data information comprises a two-layer head, further judging whether a new label needs to be added to the MPLS message according to label configuration, if so, adding a plurality of MPLS labels from the initial position, and executing step S404, otherwise, modifying the Ethernet type according to the type of the head of the internal message after deleting the MPLS labels, and executing step S404; and S404, modifying the content of the header of the second layer according to the label configuration, and forwarding the message.
2. The method according to claim 1, wherein in step S3, the Label configuration includes an OF Mode field, a Continue field, a Pop Label NO field, and an Offset field, and the OF Mode field is used to mark whether the MPLS packet is in OpenFlow Mode; the Continue field is used for marking whether to search for the next label; the Pop Label NO field is used for marking the number of labels needing to be deleted; the Offset field is used to mark where to begin deleting the tag.
3. The method of claim 2, wherein the Continue field is set to 1 to indicate that a next tag lookup is required, and set to 0 to indicate that a next tag lookup is not required.
4. The method of claim 1, wherein the internal packet header types include IPv4, IPv6, ethernet.
5. An OpenFlow-based MPLS message forwarding device is characterized by comprising
The MPLS label searching module is used for searching labels of the MPLS messages;
the MPLS label processing module is used for processing the MPLS message according to the found label configuration, and comprises a label forwarding information base module and a judgment processing module, wherein the label forwarding information base module is used for storing a plurality of label configurations; the judgment processing module is used for determining whether the MPLS message is in an OpenFlow mode according to label configuration, determining the number and the initial position of deleted labels, and determining whether to search for the next label;
MPLS message forwarding module for forwarding message, the MPLS message forwarding module including packet
A message export information obtaining module, configured to obtain MPLS message export information;
the label adding and deleting module is used for adding or deleting labels to the MPLS message, modifying the type of the Ethernet, deleting the labels of the MPLS message from the initial position according to the number of the deleted labels when the labels are deleted, and keeping the data information in the MPLS message before the initial position, wherein the data information comprises a two-layer head;
and the second-layer header modification module is used for modifying the second-layer header of the MPLS message.
6. The apparatus OF claim 5, wherein the Label configuration comprises an OF Mode field for marking whether the MPLS message is in OpenFlow Mode, a Continue field, a Pop Label NO field, and an Offset field; the Continue field is used for marking whether to search for the next label; the Pop Label NO field is used for marking the number of labels needing to be deleted; the Offset field is used to mark where to begin deleting the tag.
7. The apparatus of claim 6, wherein the Continue field is set to 1 to indicate that a next tag lookup is required, and set to 0 to indicate that a next tag lookup is not required.
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