CN113037622A - System and method for preventing BFD oscillation - Google Patents
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Abstract
The application discloses a system and a method for preventing BFD oscillation, wherein the system comprises: the network equipment 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 equipment is used for receiving the BFD message from a target leaf node and sending the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node; and the first leaf node and/or the second leaf node are/is used for receiving the BFD message. 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 receive and transmit BFD messages, and as long as the M-LAG port of one leaf node is normal, the messages can be received and transmitted without BFD detection overtime and flow forwarding packet loss.
Description
Technical Field
The present application relates to the field of networks, and in particular, to a system and a method for preventing Bidirectional Forwarding Detection (BFD) from oscillating.
Background
BFD is a general, standardized, media independent and protocol independent fast failure detection mechanism, used to detect the link connection status in the network, and ensure that the communication failure can be detected rapidly between the devices, so as to take measures in time and ensure the continuous operation of the service. BFD may quickly detect a failure of the two-way forwarding path of two devices for various upper layer protocols (e.g., routing protocols, etc.). The upper layer protocol usually adopts a Hello message mechanism to detect faults, the required time is in the second level, and BFD can provide millisecond detection, so that the network convergence speed can be accelerated, the application interruption time is reduced, and the network reliability is improved.
In a prior art BFD detection cross-device link aggregation group (M-LAG) dual-active gateway, two leaf nodes, namely a first leaf node (leaf1) and a second leaf node (leaf2), are included, and the two leaf nodes are located in an access layer and used for accessing a Virtual Machine (VM). Since the dual active gateway is virtualized as a 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 pointing to an M-LAG port from a BFD single-arm double-descriptor session binding output port needs to be deployed on a double-active gateway, so that detection of a VM can be realized.
In the forwarding process of the BFD message, if the BFD message is sent from the M-LAG port of the leaf2 and then arrives at the VM, after receiving the BFD message, the VM forwards the BFD message through a Link Aggregation Group (LAG) port according to a route. After the LAG hash, if the packet returns to the leaf1, the leaf1 finds that the end point of the packet is leaf2 according to the packet and the leaf1 forwarding descriptor configuration table, and the leaf1 sends the packet to the leaf2 through a peer-link (peer-link) to complete BFD forwarding. In this scenario, if the M-LAG port of the leaf2 fails, the Address Resolution Protocol (ARP) egress port of the IP address bound by the BFD of the leaf2 cannot forward a packet, and then the BFD local session on the leaf2 is switched to the peer-link port again at the ARP egress port and cannot transmit and receive the packet, which easily causes BFD detection timeout, and further forms a refresh of a route caused by false down to cause flow forwarding packet loss.
Disclosure of Invention
A first aspect of an embodiment of the present application provides a system for preventing BFD oscillation, where the system includes: the network equipment 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 equipment is used for receiving the BFD message from a target leaf node and sending the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node; and the first leaf node and/or the second leaf node are/is used for receiving the BFD message. Therefore, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also receive and transmit 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 received and transmitted without BFD detection overtime and flow forwarding packet loss.
Optionally, with reference to the first aspect, in a first possible implementation manner of the first aspect, if the first leaf node is the 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 the 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; and the first leaf node is used for carrying out BFD termination.
Optionally, with reference to any one of the first aspect to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the first leaf node and the second leaf node are configured with the BFD session information.
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 to be forwarded.
A second aspect of the present application provides a method for preventing BFD oscillation, the method comprising: the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to network equipment; after receiving the BFD message from a target leaf node, the network device sends the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node; and the first leaf node and/or the second leaf node receive the BFD message. Therefore, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also receive and transmit 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 received and transmitted without BFD detection overtime and flow forwarding packet loss.
Optionally, with reference to the second aspect, in a first possible implementation manner of the second aspect, if the first leaf node is the end 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 the end 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 carries out BFD termination.
Optionally, with reference to any one of the second possible implementation manners 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 identify the BFD message as the BFD message to be forwarded.
A third aspect of the present application provides a leaf node, the 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 which needs to be forwarded.
A fourth aspect of the present application provides a 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 oscillation, wherein the system comprises: the network equipment 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 equipment is used for receiving the BFD message from a target leaf node and sending the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node; and the first leaf node and/or the second leaf node are/is used for receiving the BFD message. Therefore, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also receive and transmit 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 received and transmitted without BFD detection overtime and flow forwarding packet loss.
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 according to the present disclosure;
fig. 3 is a schematic diagram of a method for preventing BFD oscillation according to the present application;
fig. 4 is a schematic diagram of a leaf node for preventing BFD oscillation according to the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The term "and/or" appearing in the present application may be an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" in this application generally indicates that the former and latter related objects are in 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 drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Moreover, the terms "comprises," "comprising," and any other variation 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 explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, in the BFD detection M-LAG dual-active gateway in the prior art, two leaf nodes, namely, a first leaf node (leaf1) and a second leaf node (leaf2), are included, and the two leaf nodes are located in an access stratum and are used for accessing a network device, which may include a VM or a server, and the like, and the present invention is not limited herein. Since the dual active gateway is virtualized as a 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 pointing to an M-LAG port from a BFD single-arm double-descriptor session binding output port needs to be deployed on a double-active gateway, so that detection of a VM can be realized.
In the forwarding process of the BFD message, if the BFD message is sent from the M-LAG port of the leaf2 first and then arrives at the network device, the network device forwards the BFD message through the LAG port according to the route. After the LAG hash, if the packet returns to the leaf1, the leaf1 finds that the end point of the packet is leaf2 according to the packet and the leaf1 forwarding descriptor configuration table, and the leaf1 sends the packet to the leaf2 through a peer-link (peer-link) to complete BFD forwarding. In this scenario, if the M-LAG port of the leaf2 fails, the ARP egress port of the IP address bound by the BFD of the leaf2 cannot forward a message, and then the BFD local session on the leaf2 is switched again to the peer-link port at the ARP egress port and cannot transmit and receive the message, which easily causes BFD detection timeout, and further causes a refresh of a route due to false down reporting, resulting in flow forwarding packet loss. However, in this case, if the M-LAG port of the leaf1 does not fail, the logical gateway formed by the leaf1 and the leaf2 should not be down.
In view of the above, the present application provides a system for preventing BFD oscillation, and referring to fig. 2, the system includes a first leaf node (leaf1) and a second leaf node (leaf2), and a network device, which may be a VM or a server, and is not limited herein. The LEAF1 and the LEAF2 are respectively configured with local sessions of My-Disc and Peer-Disc, wherein My-Disc 10 of LEAF1 and Peer-Disc 10 of LEAF2 are active-standby sessions, My-Disc 20 of LEAF2 and Peer-Disc 20 of LEAF1 are active-standby sessions, and the local sessions of the two LEAF devices detect the interface IP of the network device. The LEAF1 and LEAF2 may deploy the next hop as a static route for the IP of the network device and Track (Track) the BFD session locally.
After the local sessions of the leaf1 and the leaf2 send out BFD messages, the messages can be forwarded in three layers after reaching the network device, which can ensure that the messages can be forwarded back to any of the two leaf devices. When the local session of the leaf1 equipment sends out a BFD message, the leaf2 equipment which configures the Peer-Disc at the Peer-link opposite end sends a BFD session message together, thereby forming a mechanism for the two leaf devices to transmit BFD messages in a dual mode, the dual mode can improve the reliability of BFD session in switching, for example, when in an M-LAG dual-homing scene, the forwarding flow reaching the leaf devices, can be forwarded to the VM equipment through the static route, the normal forwarding of the route can be maintained all the time without down of the BFD session when one end of the M-LAG fails, when one end of the M-LAG fails, the BFD main transmitting packet is unavailable, but the message of the backup transmitting packet can be continuously transmitted, the UP of the BFD conversation is maintained, and further, the route of the Track BFD session is not deleted, the ARP of the fault end is switched to a Peer-link port to ensure that the next hop of the route of the message DIP is available, and the data flow can be continuously forwarded.
An embodiment provides a system for preventing BFD oscillations, the system comprising: the network equipment 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 equipment is used for receiving the BFD message from a target leaf node and sending the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node; and the first leaf node and/or the second leaf node are/is used for receiving the BFD message. Therefore, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also receive and transmit 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 received and transmitted without BFD detection overtime and flow forwarding packet loss.
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. and the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to the network equipment.
And the first leaf node and the second leaf node both send Bidirectional Forwarding Detection (BFD) messages to the network equipment. The two may be sent simultaneously or at intervals, which is not limited herein.
102. And after receiving the BFD message from the target leaf node, the network equipment sends the BFD message to the target leaf node.
And after receiving the BFD message from the target leaf node, the network equipment sends the BFD message 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 the M-LAG port of the other leaf node fails, and the network device may forward the BFD packet only to the leaf node with the normal M-LAG port.
For example, if the network device receives a BFD packet only from a first leaf node, the network device may forward the BFD packet 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. And the first leaf node and/or the second leaf node receive the BFD message.
At least one of the first leaf node and the second leaf node can receive the BFD message. The first leaf node and the second leaf node can forward the BFD message through the peer-link, and can ensure that the BFD message can reach the end point of the BFD message to carry out BFD termination.
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 shown 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 may 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 performs BFD termination. If the leaf node with the M-LAG port fault is the end point of the BFD message, the leaf node with the normal M-LAG port forwards the BFD message to the leaf node with the M-LAG port fault through peer-link, and the leaf node with the M-LAG port fault carries out BFD termination.
An embodiment two provides a method for preventing BFD oscillation, the system comprising: the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to network equipment; after receiving the BFD message from a target leaf node, the network device sends the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node; and the first leaf node and/or the second leaf node receive the BFD message. Therefore, if the M-LAG port of one of the first leaf node and the second leaf node fails, the other leaf node can also receive and transmit 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 received and transmitted without BFD detection overtime and flow forwarding packet loss. The BFD session can be ensured to be maintained in the up state, and the flow forwarding is ensured to be normal.
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 includes a capture module 201, a processing module 202, and a management module 203.
The capture module 201 may be a load balance switch (LSW) chip. The capturing module 201 may capture a BFD packet first, perform priority processing on the BFD packet, and 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 a BFD packet that needs to be sent to the management module 203 from a normal BFD packet that needs to be forwarded. The BFD messages described in the first and second embodiments are messages that need to be forwarded normally. Meanwhile, the processing module 202 may send a BFD packet at a fixed time and maintain the session up. The management module 203 may be a Central Processing Unit (CPU), and may receive the BFD message sent by the processing module 202.
The system and the method for preventing BFD oscillation provided by the embodiment of the present application are introduced in detail above, and a specific example is applied in the present application to explain the principle and the implementation of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application. 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A system for BFD shock prevention, said system comprising a first leaf node, a second leaf node and a network device,
the first leaf node and the second leaf node are used for sending Bidirectional Forwarding Detection (BFD) messages to the network equipment;
the network equipment is used for receiving the BFD message from a target leaf node and sending the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node;
and the first leaf node and/or the second leaf node are/is used for receiving the BFD message.
2. The system of claim 1,
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 carrying out BFD termination.
3. The system of claim 1,
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;
and the first leaf node is used for carrying out BFD termination.
4. The system according to any one of claims 1 to 3,
the first leaf node and the second leaf node are configured with the BFD session information.
5. The system of claim 4,
and the first leaf node and/or the second leaf node are/is also used for identifying the BFD message as the BFD message needing to be forwarded.
6. A method for preventing BFD oscillation, the method is based on the system of any one of claims 1 to 5, characterized in that the method comprises:
the first leaf node and the second leaf node send Bidirectional Forwarding Detection (BFD) messages to network equipment;
after receiving the BFD message from a target leaf node, the network device sends the BFD message to the target leaf node, wherein the target leaf node comprises the first leaf node and/or the second leaf node;
and the first leaf node and/or the second leaf node receive the BFD message.
7. The method of claim 6, further comprising:
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 carries out BFD termination.
8. The method of claim 6, further comprising:
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 carries out BFD termination.
9. The method according to any one of claims 6 to 8,
the first leaf node and the second leaf node are configured with the BFD session information.
10. The method according to claim 9, wherein after the first leaf node and/or the second leaf node receives the BFD packet, the method further comprises:
and the first leaf node and/or the second leaf node identify the BFD message as the BFD message to be forwarded.
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| CN117278345A (en) * | 2023-11-20 | 2023-12-22 | 新华三技术有限公司 | Energy saving method and device applied to network equipment |
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