CN108400911B - Device and method for realizing Micro-BFD protocol - Google Patents
Device and method for realizing Micro-BFD protocol Download PDFInfo
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- CN108400911B CN108400911B CN201810163959.5A CN201810163959A CN108400911B CN 108400911 B CN108400911 B CN 108400911B CN 201810163959 A CN201810163959 A CN 201810163959A CN 108400911 B CN108400911 B CN 108400911B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/50—Testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0805—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability
- H04L43/0811—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters by checking availability by checking connectivity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L2101/00—Indexing scheme associated with group H04L61/00
- H04L2101/60—Types of network addresses
- H04L2101/618—Details of network addresses
- H04L2101/622—Layer-2 addresses, e.g. medium access control [MAC] addresses
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Abstract
The invention discloses a device and a method for realizing a Micro-BFD protocol, wherein the device comprises a message identification module, an OAM engine module and a message editing module, wherein the message identification module is used for identifying whether a received message is a Micro-BFD message or not and whether the Micro-BFD message comes from a link aggregation group member interface or not; and the OAM engine module forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module, and the message editing module edits a target Mac address of the two-layer head part of the Micro-BFD message according to the message editing information. The method and the device quickly detect the link state between the member interfaces in the link aggregation group by sending the Micro-BFD message, and have the advantages of high stability and high speed.
Description
Technical Field
The invention relates to the technical field of network communication, in particular to a device and a method for realizing a Micro-BFD protocol.
Background
Bidirectional forwarding detection is a mechanism for rapidly detecting failures in a network, and is mainly used for detecting the connection condition of links in the network.
The link aggregation group is to bind a plurality of ethernet physical links into one aggregation link, thereby achieving the purpose of increasing the link bandwidth. The binding of the physical link can be realized by binding the Ethernet interfaces. The Ethernet interfaces are bundled to form an aggregation group, the aggregation group corresponds to an aggregation interface of an aggregation link, and each Ethernet interface is a member port of the aggregation interface. At present, there are many BFD technologies including IP-BFD, MPLS-BFD, TP-BFD, etc. These BFD techniques may be implemented in hardware or software or a combination of hardware and software, but are not capable of detecting link aggregation group member interfaces.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a device and a method for realizing a Micro-BFD protocol, which can quickly detect the link state between member interfaces in a link aggregation group by sending a Micro-BFD message.
In order to achieve the purpose, the invention provides the following technical scheme: a device for realizing a Micro-BFD protocol comprises a message identification module, an OAM engine module and a message editing module, wherein the message identification module is used for identifying whether a received message is a Micro-BFD message or not and whether the Micro-BFD message comes from a link aggregation group member interface or not and sending the Micro-BFD message from the link aggregation group member interface to the OAM engine module; the OAM engine module changes the state of the Micro-BFD state machine according to the received Micro-BFD message, forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module; and the message editing module edits the Micro-BFD message according to the message editing information and sends the edited Micro-BFD message to a link aggregation group member interface for link state detection.
Preferably, the message identification module judges whether the message is a Micro-BFD message according to the UDP port number in the message.
Preferably, the message identification module identifies whether the Micro-BFD message is from a link aggregation group member interface, by combining a Your Discriminator field in the Micro-BFD message and source port information for sending the Micro-BFD message.
Preferably, the source port information of the Micro-BFD packet may be obtained according to a source IP address in the Micro-BFD packet.
Preferably, the message editing information includes: when the Micro-BFD state machine is in a non-Up state, the destination Mac address of the head part of the two layers in the Micro-BFD message is a multicast address; and when the Micro-BFD state machine is in an Up state, the target Mac address of the head part of the two layers in the Micro-BFD message is a next hop Mac address.
A method for realizing a Micro-BFD protocol comprises the following steps:
s1, the message identification module judges whether the received message is a Micro-BFD message, if so, the step S2 is executed;
s2, judging whether the Micro-BFD message comes from a link aggregation group member interface or not, if so, transmitting the Micro-BFD message from the link aggregation group member interface to an OAM engine module;
s3, the OAM engine module changes the state of the Micro-BFD state machine according to the received Micro-BFD message, and forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module;
and S4, the message editing module edits the Micro-BFD message according to the message editing information and sends the edited Micro-BFD message to a link aggregation group member interface for link state detection.
Preferably, the message identification module judges whether the message is a Micro-BFD message according to the UDP port number in the message.
Preferably, the message identification module identifies whether the Micro-BFD message is from a link aggregation group member interface, by combining a Your Discriminator field in the Micro-BFD message and source port information for sending the Micro-BFD message.
Preferably, the source port information of the Micro-BFD packet may be obtained according to a source IP address in the Micro-BFD packet.
Preferably, the message editing information includes: when the Micro-BFD state machine is in a non-Up state, the destination Mac address of the head part of the two layers in the Micro-BFD message is a multicast address; and when the Micro-BFD state machine is in an Up state, the target Mac address of the head part of the two layers in the Micro-BFD message is a next hop Mac address.
The invention has the beneficial effects that:
compared with the prior art, the device and the method for realizing the Micro-BFD message change the target Mac address of the head part of the two layers in the Micro-BFD message through the state of the Micro-BFD state machine, so that the link state between member interfaces in a link aggregation group is quickly detected.
Drawings
FIG. 1 is a block diagram of a device implementing the Micro-BFD protocol according to the present invention;
FIG. 2 is a flow chart of the present invention for the local exchange device to send the Micro-BFD message;
FIG. 3 is a flow chart of an implementation of the Micro-BFD protocol of 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 device and the method for realizing the Micro-BFD protocol can quickly detect the link state between member interfaces in a link aggregation group.
As shown in fig. 1, a device for implementing the Micro-BFD protocol is mainly applied to a local exchange device or a remote exchange device that enables a link aggregation function, and in the specific implementation, the device is implemented in a chip form, and the chip may be an ASIC chip, an FPGA chip, or an NP chip. Specifically, the device comprises a message identification module, an OAM engine module and a message editing module. The message identification module is used for identifying whether the received message is a Micro-BFD message or not, identifying whether the Micro-BFD message comes from a link aggregation group member interface or not, and sending the Micro-BFD message from the link aggregation group member interface to the OAM engine module; the OAM engine module changes the state of the Micro-BFD state machine according to the received Micro-BFD message, forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module; and the message editing module edits the Micro-BFD message according to the message editing information and sends the Micro-BFD message to a link aggregation group member interface for link state detection.
Further, when identifying the received message, the message identification module judges whether the message is a Micro-BFD message or not according to the UDP port number in the message. And when the UDP port number is 6784, the message is represented as a Micro-BFD message. Similarly, when the device encapsulates the Micro-BFD packet, the UDP port number numbered 6784 is also used. In order to determine whether the received Micro-BFD message needs to be sent to the OAM engine module for processing, the message identification module combines a Your descriptor field in the Micro-BFD message and source port information for sending the Micro-BFD message to perform judgment. Wherein, the Your Discriminator field represents the remote identifier of the BFD session connection; the source port of the message can be obtained according to the source IP address in the Micro-BFD message. If the port bound by the source IP address is Eth0 port, after the source IP address in the message is obtained, the source port corresponding to the source IP address can be further obtained.
And the OAM engine module changes the State of the Micro-BFD State machine according to the value of the State field in the received Micro-BFD message. Wherein the State field is used to identify the BFD local State. When detecting the link state, the local exchange device and the far-end exchange device establish BFD sessions according to the number of links, if 3 links exist, 3 BFD sessions are established for detecting the state of the 3 links. During the session, the session is established through a three-way handshake mechanism, and the session is maintained in an UP state for link state detection. If the Micro-BFD message is not received within a period of time, namely the UP state cannot be maintained, a link fault exists.
The invention is applied to the link detection between the interfaces of the link aggregation group members, when the state of a Micro-BFD state machine is Down, AdminDown and Init, the Mac address of the target of the part of the two layers of heads in the Micro-BFD message is a multicast address 01-00-5E-90-00-01; when the Micro-BFD state machine is Up, the target Mac address of the head part of the two layers in the Micro-BFD message is an actual next-hop Mac address, and the next-hop Mac address is the Mac address of the opposite end of the Micro-BFD, which can be the Mac address of a port or the Mac address of a router. In specific implementation, the OAM engine module forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module. And the message editing module edits the message according to the message editing information. Namely, when the state of the Micro-BFD state machine is non-UP, the message editing module sets the destination Mac address in the message two-layer header as the multicast address 01-00-5E-90-00-01 during message editing. When the state of the state machine is UP, the message editing module sets the target Mac address in the two-layer header of the message as the actual next-hop Mac address during message editing and sends the message out.
In this embodiment, a local-side switching device is taken as an example to describe in detail how the local-side switching device performs encapsulation and transmission of the Micro-BFD packet.
As shown in fig. 2, the local switching device includes an OAM engine module, a message editing module, and a message identification module (not shown). The OAM engine module encapsulates the related information (such as the destination address obtained by the upper layer protocol through hello mechanism) into an IP packet, and the IP packet can be sent out to detect the link state after being edited by the packet editing module. And the message editing module determines which two-layer header is added before the IP message according to the message editing information. The message editing information is related to the state of a Micro-BFD state machine in the OAM engine module. When the state of the Micro-BFD state machine is Down, AdminDown and Init, the destination Mac address in the two-layer header is the multicast address 01-00-5E-90-00-01, and when the state of the Micro-BFD state machine is Up, the destination Mac address in the two-layer header is the actual next hop Mac address.
As shown in fig. 3, a method for implementing the Micro-BFD protocol includes the following steps:
s1, the message identification module judges whether the received message is a Micro-BFD message, if so, the step S2 is executed, otherwise, the processing is not carried out;
s2, judging whether the Micro-BFD message comes from a link aggregation group member interface or not, if so, transmitting the Micro-BFD message from the link aggregation group member interface to an OAM engine module;
s3, the OAM engine module changes the state of the Micro-BFD state machine according to the received Micro-BFD message, and forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module;
and S4, the message editing module edits the Micro-BFD message according to the message editing information and sends the edited Micro-BFD message to a link aggregation group member interface for link state detection.
Specifically, the message editing module identifies whether the message is a Micro-BFD message according to a UDP port number in the message, where the UDP port number is 6784. And when the message is a Micro-BFD message, the message identification module further judges whether the Micro-BFD message needs to be processed by the OAM engine module. And the message identification module combines a Your descriptor field in the Micro-BFD message and source port information for sending the Micro-BFD message to judge. The source port of the message can be obtained according to the source IP address in the Micro-BFD message.
Furthermore, when the message is edited by the message editing module, the invention determines the address of the target Mac address in the two-layer header according to the state of the Micro-BFD state machine. When the state of the Micro-BFD state machine is Down, AdminDown and Init, the Mac address of the target part of the two layers of heads in the Micro-BFD message is a multicast address 01-00-5E-90-00-01; when the Micro-BFD state machine is Up, the target Mac address of the head part of the two layers in the Micro-BFD message is an actual next-hop Mac address, and the next-hop Mac address is the Mac address of the opposite end of the Micro-BFD, which can be a Mac of a port or a Mac of a router. In specific implementation, the OAM engine module forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module. And the message editing module edits the message according to the message editing information. Namely, when the state of the Micro-BFD state machine is non-UP, the message editing module sets the destination Mac address in the message two-layer header as the multicast address 01-00-5E-90-00-01 during message editing. When the state of the state machine is UP, the message editing module sets the target Mac address in the two-layer header of the message as the actual next-hop Mac address during message editing and sends the message out.
The device and the method for realizing the Micro-BFD message realize the rapid detection of the link state between the member interfaces in the link aggregation group mainly in a hardware mode, and have the advantages of high stability and high speed compared with the software realization.
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 (8)
1. A device for realizing a Micro-BFD protocol is characterized by comprising a message identification module, an OAM engine module and a message editing module, wherein the message identification module is used for identifying whether a received message is a Micro-BFD message or not and whether the Micro-BFD message comes from a link aggregation group member interface or not and sending the Micro-BFD message from the link aggregation group member interface to the OAM engine module; the OAM engine module changes the state of the Micro-BFD state machine according to the received Micro-BFD message, forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module; the message editing module edits the Micro-BFD message according to message editing information and sends the edited Micro-BFD message to a link aggregation group member interface for link state detection, wherein the message editing information comprises that when the Micro-BFD state machine is in a non-Up state, a target Mac address of a part of a two-layer head in the Micro-BFD message is a multicast address 01-00-5E-90-00-01; and when the Micro-BFD state machine is in an Up state, the target Mac address of the head part of the two layers in the Micro-BFD message is a next hop Mac address.
2. The apparatus according to claim 1, wherein the packet identification module determines whether the packet is a Micro-BFD packet according to a UDP port number in the packet.
3. The apparatus of claim 1, wherein the packet identifying module identifies whether the Micro-BFD packet is from a link aggregation group member interface by combining a Your Discriminator field in the Micro-BFD packet and source port information of the Micro-BFD packet.
4. The apparatus according to claim 3, wherein the source port information of the Micro-BFD packet is obtained from a source IP address in the Micro-BFD packet.
5. A method for implementing a Micro-BFD protocol based on the apparatus of claim 1, comprising the steps of:
s1, the message identification module judges whether the received message is a Micro-BFD message, if so, the step S2 is executed;
s2, judging whether the Micro-BFD message comes from a link aggregation group member interface or not, if so, transmitting the Micro-BFD message from the link aggregation group member interface to an OAM engine module;
s3, the OAM engine module changes the state of the Micro-BFD state machine according to the received Micro-BFD message, and forms message editing information according to the state of the Micro-BFD state machine and sends the message editing information to the message editing module;
s4, the message editing module edits the Micro-BFD message according to message editing information and sends the edited Micro-BFD message to a link aggregation group member interface for link state detection, wherein the message editing information comprises that when the Micro-BFD state machine is in a non-Up state, a target Mac address of a part of a two-layer header in the Micro-BFD message is a multicast address 01-00-5E-90-00-01; and when the Micro-BFD state machine is in an Up state, the target Mac address of the head part of the two layers in the Micro-BFD message is a next hop Mac address.
6. The method according to claim 5, wherein the message identification module determines whether the message is a Micro-BFD message according to the UDP port number in the message.
7. The method according to claim 5, wherein the packet identifying module identifies whether the Micro-BFD packet is from a Link aggregation group member interface by combining a Your Discriminator field in the Micro-BFD packet and source port information of the Micro-BFD packet.
8. The method according to claim 7, wherein the source port information of the Micro-BFD packet is obtained from a source IP address in the Micro-BFD packet.
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| CN109347671B (en) * | 2018-10-24 | 2021-11-05 | 苏州盛科通信股份有限公司 | System and method for realizing in-band OAM Metadata editing in chip |
| CN110752992B (en) * | 2019-10-28 | 2021-11-26 | 苏州盛科通信股份有限公司 | Device and method for realizing point-to-multipoint by MPLS SBFD reflection end |
| CN112804116B (en) * | 2020-06-30 | 2023-02-17 | 中兴通讯股份有限公司 | Link detection method, electronic device and computer readable medium |
| CN115065626A (en) * | 2022-05-07 | 2022-09-16 | 苏州盛科通信股份有限公司 | Source port checking method and device in Micro-BFD, electronic equipment and storage medium |
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