CN113037622B - System and method for preventing BFD from vibrating - Google Patents
System and method for preventing BFD from vibrating Download PDFInfo
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- 238000001514 detection method Methods 0.000 claims abstract description 24
- 230000010355 oscillation Effects 0.000 claims description 13
- 230000002457 bidirectional effect Effects 0.000 claims description 12
- 230000002776 aggregation Effects 0.000 claims description 6
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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
- H04L45/28—Routing or path finding of packets in data switching networks using route fault recovery
Abstract
The application discloses a prevent BFD and vibrate system and method, this system includes: the system comprises a first leaf node, a second leaf node and network equipment, wherein the first leaf node and the second leaf node are used for sending BFD messages to the network equipment; the network device is configured to receive the BFD packet from a target leaf node, and send the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node; the first leaf node and/or the second leaf node are/is configured to receive the BFD packet. If the M-LAG port of one of the first leaf node and the second leaf node fails, the leaf node which does not fail can send and receive BFD messages, and as long as the M-LAG port of one leaf node is normal, the message can be sent and received without the occurrence of BFD detection overtime, and the packet loss caused by flow forwarding can not be caused.
Description
Technical Field
The present application relates to the field of networks, and in particular, to a system and method for preventing oscillation of a bidirectional forwarding detection mechanism (bidirectional forwarding detection, BFD).
Background
BFD is a universal, standardized, medium-independent and protocol-independent rapid fault detection mechanism for detecting the connection status of links in a network, ensuring that communication faults can be rapidly detected between devices so as to timely take measures and ensure continuous operation of services. BFD may rapidly detect failure of the bi-directional forwarding path of two devices for various upper layer protocols (e.g., routing protocols, etc.). The upper layer protocol generally adopts a Hello message mechanism to detect faults, the required time is in the second level, and BFD can provide millisecond level detection, so that the network convergence speed can be increased, the application interruption time is reduced, and the reliability of the network is improved.
BFD detects a dual-active gateway across a device link aggregation group (multichassis link aggregation group, M-LAG) in the prior art, including two leaf nodes, a first leaf node (leaf 1) and a second leaf node (leaf 2), located at an access layer for accessing a Virtual Machine (VM). Since the dual-active gateway is virtualized as one logical gateway, the entire logical gateway is considered unavailable only if both leaf nodes in the dual-active gateway are unavailable. When BFD is deployed, ARP with a BFD single-arm double-descriptor session binding port pointing to an M-LAG port is required to be deployed on the dual-active gateway, so that detection of VM can be realized.
In the forwarding process of the BFD message, if the BFD message is sent out from the M-LAG port of leaf2 and then arrives at the VM, the BFD message is forwarded through the link aggregation group (link aggregation group, LAG) port according to the route after the VM receives the BFD message. After the LAG hash, if the message is returned to the leaf1, the leaf1 finds that the end point of the message is the leaf2 according to the message and the leaf1 forwarding descriptor configuration table, and the leaf1 sends the message to the leaf2 through a peer-link (peer-link) to complete BFD forwarding. Under this scenario, if the M-LAG port of the leaf2 fails, the address resolution protocol (address resolution protocol, ARP) egress port of the BFD-bound IP address of the leaf2 cannot forward the message, and further the BFD local session on the leaf2 is re-switched to the peer-link port at the ARP egress port, so that the message cannot be received and sent, which easily causes BFD detection timeout, and further forms a packet loss caused by traffic forwarding due to the refreshing of the route caused by the false report down.
Disclosure of Invention
A first aspect of an embodiment of the present application provides a system for preventing BFD from oscillating, the system including: the system comprises a first leaf node, a second leaf node and network equipment, wherein the first leaf node and the second leaf node are used for sending Bidirectional Forwarding Detection (BFD) messages to the network equipment; the network device is configured to receive the BFD packet from a target leaf node, and send the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node; the first leaf node and/or the second leaf node are/is configured to receive the BFD packet. Thus, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also transmit and receive BFD messages, and if the M-LAG port of one of the first leaf node and the second leaf node is normal, the messages can be transmitted and received without the occurrence of BFD detection timeout and without causing packet loss in traffic forwarding.
Optionally, with reference to the first aspect, in a first possible implementation manner of the first aspect, if the first leaf node is an end point of the BFD packet, when the first leaf node receives the BFD packet, the first leaf node is further configured to perform BFD termination.
Optionally, with reference to the first aspect, in a second possible implementation manner of the first aspect, if the first leaf node is an end point of the BFD packet, when the second leaf node receives the BFD packet, the second leaf node is configured to forward the BFD packet to the first leaf node; the first leaf node is configured to perform BFD termination.
Optionally, with reference to any one of the second possible implementation manners of the first aspect, in a third possible implementation manner of the first aspect, the BFD session information is configured on the first leaf node and the second leaf node.
Optionally, with reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the first leaf node and/or the second leaf node is further configured to identify the BFD packet as a BFD packet that needs to be forwarded.
A second aspect of the present application provides a method for preventing BFD oscillations, the method comprising: the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to the network equipment; after receiving the BFD packet from a target leaf node, the network device sends the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node; the first leaf node and/or the second leaf node receives the BFD message. Thus, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also transmit and receive BFD messages, and if the M-LAG port of one of the first leaf node and the second leaf node is normal, the messages can be transmitted and received without the occurrence of BFD detection timeout and without causing packet loss in traffic forwarding.
Optionally, with reference to the second aspect, in a first possible implementation manner of the second aspect, if the first leaf node is a destination point of the BFD packet, when the first leaf node receives the BFD packet, the first leaf node performs BFD termination.
Optionally, with reference to the second aspect, in a second possible implementation manner of the second aspect, if the first leaf node is a destination point of the BFD packet, when the second leaf node receives the BFD packet, the second leaf node forwards the BFD packet to the first leaf node; and the first leaf node performs BFD termination.
Optionally, with reference to any one of the second aspect to the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the BFD session information is configured on the first leaf node and the second leaf node.
Optionally, with reference to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, after the first leaf node and/or the second leaf node receives the BFD packet, the method further includes: and the first leaf node and/or the second leaf node identifies the BFD message as the BFD message needing to be forwarded.
A third aspect of the present application provides a leaf node comprising: a sending module, configured to send a bidirectional forwarding detection BFD packet to the network device; the receiving module is used for receiving the BFD message; and the identification module is used for identifying the BFD message as the BFD message needing to be forwarded.
A fourth aspect of the present application provides a network device, the network device comprising: the receiving module is used for receiving the BFD message; and the sending module is used for sending the BFD message to the first leaf node and/or the second leaf node.
The embodiment of the application provides a system and a method for preventing BFD from oscillating, wherein the system comprises: the system comprises a first leaf node, a second leaf node and network equipment, wherein the first leaf node and the second leaf node are used for sending Bidirectional Forwarding Detection (BFD) messages to the network equipment; the network device is configured to receive the BFD packet from a target leaf node, and send the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node; the first leaf node and/or the second leaf node are/is configured to receive the BFD packet. Thus, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also transmit and receive BFD messages, and if the M-LAG port of one of the first leaf node and the second leaf node is normal, the messages can be transmitted and received without the occurrence of BFD detection timeout and without causing packet loss in traffic forwarding.
Drawings
FIG. 1 is a schematic diagram of a BFD oscillation prevention system according to the prior art;
fig. 2 is a schematic diagram of a system for preventing BFD oscillation provided in the present application;
FIG. 3 is a schematic diagram of a method for preventing BFD oscillation;
fig. 4 is a schematic view of a leaf node for preventing BFD oscillation provided in the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The term "and/or" appearing in the present application may be an association relationship describing an associated object, meaning that there may be three relationships, for example, a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In this application, the character "/" generally indicates that the associated object is an or relationship.
The terms first, second and the like in the description and in the claims of the present application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments described herein may be implemented in other sequences than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules that are expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, in the prior art BFD dual-active M-LAG gateway, the dual-active M-LAG gateway includes two leaf nodes, i.e., a first leaf node (leaf 1) and a second leaf node (leaf 2), which are located in an access layer and are used for accessing a network device, which may include a VM or a server, etc., without limitation herein. Since the dual-active gateway is virtualized as one logical gateway, the entire logical gateway is considered unavailable only if both leaf nodes in the dual-active gateway are unavailable. When BFD is deployed, ARP with a BFD single-arm double-descriptor session binding port pointing to an M-LAG port is required to be deployed on the dual-active gateway, so that detection of VM can be realized.
In the forwarding process of the BFD message, if the BFD message is sent out from the M-LAG port of leaf2 and then arrives at the network equipment, the network equipment forwards the BFD message through the LAG port according to the route. After the LAG hash, if the message is returned to the leaf1, the leaf1 finds that the end point of the message is the leaf2 according to the message and the leaf1 forwarding descriptor configuration table, and the leaf1 sends the message to the leaf2 through a peer-link (peer-link) to complete BFD forwarding. Under this scenario, if the M-LAG port of the leaf2 fails, the ARP output port of the IP address bound by the BFD of the leaf2 cannot forward the packet, and further the BFD local session on the leaf2 is switched to the peer-link port again at the ARP output port, so that the packet cannot be received and sent, and the BFD detection is easy to timeout, and further a packet loss caused by the traffic forwarding due to the refreshing of the route caused by the false report down is formed. However, in this case, if the M-LAG port of leaf1 fails, the logical gateway formed by leaf1 and leaf2 should not report down.
In view of this, the present application provides a system for preventing BFD concurrency, referring to fig. 2, the system includes a first leaf node (leaf 1) and a second leaf node (leaf 2), and a network device, which may be a VM or a server, etc., and is not limited herein. local sessions My-Disc 10 of LEAF1 and Peer-Disc 10 of LEAF2 are respectively configured on LEAF1 and LEAF2 as primary and secondary sessions, my-Disc 20 of LEAF2 and Peer-Disc 20 of LEAF1 are primary and secondary sessions, and the local sessions of both LEAF devices detect the interface IP of the network device. LEAF1 and LEAF2 may deploy static routing of the IP with the next hop as the network device and Track (Track) local BFD sessions.
After the local session of the leaf1 and the leaf2 sends out the BFD message, the message can be forwarded in three layers after reaching the network equipment, and the message can be ensured to be forwarded back to any one of the two leaf equipment. And when the Peer-link opposite end is configured with the leaf2 equipment of the Peer-Disc, the Peer-link opposite end can send a BFD session message together, so that a mechanism of two leaf equipment double-sending BFD messages is formed, the double-sending messages can improve the reliability of the BFD session in switching, for example, when the M-LAG double-returning scene is adopted, the forwarding flow reaching the leaf equipment can be forwarded to the VM equipment through a static route, the BFD session can always maintain the normal forwarding of the route without down when the M-LAG end is failed, the BFD primary packet can not be used when the M-LAG end is failed, but the message of the backup packet can also be continuously forwarded, the UP of the BFD session is maintained, further, the route of the Track BFD session is ensured not to be deleted, the Peer-link port can be switched to ensure the next available route of the message DIP, and the data flow can be continuously forwarded.
In one embodiment, a system for preventing BFD oscillation is provided, the system including: the system comprises a first leaf node, a second leaf node and network equipment, wherein the first leaf node and the second leaf node are used for sending Bidirectional Forwarding Detection (BFD) messages to the network equipment; the network device is configured to receive the BFD packet from a target leaf node, and send the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node; the first leaf node and/or the second leaf node are/is configured to receive the BFD packet. Thus, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also transmit and receive BFD messages, and if the M-LAG port of one of the first leaf node and the second leaf node is normal, the messages can be transmitted and received without the occurrence of BFD detection timeout and without causing packet loss in traffic forwarding.
Referring to fig. 3, a second embodiment provides a method for preventing BFD oscillation, which is applied to the system for preventing BFD oscillation described in the first embodiment, and the method includes:
101. the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to the network device.
Both the first leaf node and the second leaf node send bidirectional forwarding detection, BFD, messages to the network device. Both may be transmitted simultaneously or may have a time interval, without limitation.
102. After receiving the BFD messages from the target leaf node, the network device sends BFD messages to the target leaf node.
After the network device receives the BFD messages from the target leaf node, the BFD messages are sent to the target leaf node. The target leaf node includes a first leaf node and/or a second leaf node. It should be noted that, if the network device receives the BFD packet from only one of the two leaf nodes, the network device may confirm that the M-LAG port of the leaf node is normal, and that the M-LAG port of the other leaf node fails, and the network device may forward the BFD packet to only the leaf node with the normal M-LAG port.
For example, if the network device receives a BFD message only from the first leaf node, the network device may forward the BFD message only to the first leaf node. If the network device receives BFD messages from both leaf nodes, the network device may send BFD messages to both leaf nodes.
103. The first leaf node and/or the second leaf node receives the BFD messages.
At least one of the first leaf node and the second leaf node is capable of receiving the BFD messages. The first leaf node and the second leaf node can forward the BFD message through the peer-link, so that the BFD message can reach the end point of the BFD message, and BFD termination is performed.
If the network device determines that the M-LAG port of one of the two leaf nodes is normal, the M-LAG port of the other leaf node fails, as described in step 102. After the leaf node with the normal M-LAG port receives the BFD message, the leaf node with the normal M-LAG port can determine the end point of the BFD message, and if the leaf node with the normal M-LAG port is the end point of the BFD message, the leaf node with the normal M-LAG port carries out BFD termination. If the leaf node of the M-LAG port fault is the end point of the BFD message, forwarding the BFD message to the leaf node of the M-LAG port fault by the leaf node of the M-LAG port normal, and performing BFD termination by the leaf node of the M-LAG port fault.
An embodiment II provides a method for preventing BFD oscillation, the system includes: the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to the network equipment; after receiving the BFD packet from a target leaf node, the network device sends the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node; the first leaf node and/or the second leaf node receives the BFD message. Thus, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also transmit and receive BFD messages, and if the M-LAG port of one of the first leaf node and the second leaf node is normal, the messages can be transmitted and received without the occurrence of BFD detection timeout and without causing packet loss in traffic forwarding. The BFD session can be ensured to be maintained in the up state, and the normal forwarding of the traffic can be ensured.
Referring to fig. 4, the present application provides a leaf node 20, where the leaf node 20 is the first leaf node or the second leaf node described in the first embodiment and the second embodiment. The leaf node comprises a capturing module 201, a processing module 202 and a management module 203.
The capture module 201 may be a load balancing switch (loadblance switch, LSW) chip. The capturing module 201 may capture the BFD packet first, process the BFD packet with priority, and then transmit the BFD packet to the processing module 202, where the processing module 202 may be configured to identify the BFD packet, and then distinguish the BFD packet that needs to be sent to the management module 203 from the BFD packet that is forwarded normally. The BFD messages described in the first embodiment and the second embodiment are messages that need to be forwarded normally. At the same time, the processing module 202 will send BFD messages periodically, maintaining the session up. The management module 203 may be a central processing unit (central processing unit, CPU) and may receive BFD messages sent by the processing module 202.
The system and the method for preventing BFD oscillation provided by the embodiments of the present application are described in detail, and specific examples are applied herein to illustrate the principles and the embodiments of the present application, where the descriptions of the above examples are only used to help understand the method and the core idea of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. A system for preventing BFD oscillation, wherein the system comprises a cross-device link aggregation group M-LAG and a network device, wherein the M-LAG comprises a first leaf node and a second leaf node,
the first leaf node and the second leaf node are used for sending Bidirectional Forwarding Detection (BFD) messages to the network equipment;
the network device is configured to receive the BFD packet from a target leaf node, and send the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node;
the first leaf node and/or the second leaf node are/is configured to receive the BFD packet;
if the first leaf node is the end point of the BFD message, when the second leaf node receives the BFD message, the second leaf node is used for forwarding the BFD message to the first leaf node;
the first leaf node is configured to perform BFD termination.
2. The system of claim 1, wherein the system further comprises a controller configured to control the controller,
and if the first leaf node is the end point of the BFD message, when the first leaf node receives the BFD message, the first leaf node is also used for BFD termination.
3. The system according to claim 1 or 2, wherein,
BFD session information is configured on the first leaf node and the second leaf node.
4. The system of claim 3, wherein the system further comprises a controller configured to control the controller,
the first leaf node and/or the second leaf node are further configured to identify the BFD packet as a BFD packet that needs to be forwarded.
5. A method of preventing BFD oscillations, the method being based on the system of any of claims 1 to 4, the system comprising a cross-device link aggregation group, M-LAG, and a network device, the M-LAG comprising a first leaf node and a second leaf node, the method comprising:
the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to the network equipment;
after receiving the BFD packet from a target leaf node, the network device sends the BFD packet to the target leaf node, where the target leaf node includes the first leaf node and/or the second leaf node;
the first leaf node and/or the second leaf node receives the BFD message;
if the first leaf node is the end point of the BFD message, when the second leaf node receives the BFD message, the second leaf node forwards the BFD message to the first leaf node;
and the first leaf node performs BFD termination.
6. The method of claim 5, wherein the method further comprises:
and if the first leaf node is the end point of the BFD message, when the first leaf node receives the BFD message, the first leaf node performs BFD termination.
7. The method according to claim 5 or 6, wherein,
BFD session information is configured on the first leaf node and the second leaf node.
8. The method according to claim 7, wherein after the first leaf node and/or the second leaf node receives the BFD messages, the method further comprises:
and the first leaf node and/or the second leaf node identifies the BFD message as the BFD message needing to be forwarded.
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| CN113037622A (en) | 2021-06-25 |
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