16 results about "Bidirectional Forwarding Detection" patented technology

Techniques are described for detecting a change in Path Maximum Transfer Unit (PMTU) in a network and initiating a PMTU discovery process. A Bidirectional Forwarding Detection (BFD) data packet is generated having enhanced headers configured to record a largest packet sent value and a largest packet received value. The BFD data packet is sent from a first network device (such as a first router) to a second network device (such as a second router). A largest packet sent value and a largest packet received value are each recorded in the BFD data packet. If the largest data packet sent value is larger than the largest data packet received value, then a determination can be made that a path change has resulted in a reduction in PMTU which has resulted in either a data packet being fragmented, a data packet being dropped or both. A PMTU discovery can then be performed.

The invention discloses a running state monitoring method and device, electronic equipment and a storage medium, and relates to the technical field of computers. Creating a bidirectional forwarding detection session between the first device and the second device in a bidirectional forwarding detection module according to the identified heartbeat registration information, so as to execute a heartbeat message transceiving task based on the bidirectional forwarding detection module, and synchronizing an execution result parameter of the heartbeat message transceiving task to the first software unit, the bidirectional forwarding detection module is a hardware module specially used for monitoring link and path states between devices on the devices, and the problem of state misjudgment caused by the fact that heartbeat data packets are not sent in time due to scheduling of a central processing unit can be effectively solved by unloading heartbeat detection tasks of a software unit to the bidirectional forwarding detection module for execution. The precision of the heartbeat detection result is improved, and the pressure of executing the heartbeat detection task of the software unit by the central processing unit is reduced.

A node of a network includes a network interface configured to receive outgoing bidirectional forward detection (BFD) echo packets transmitted from an originating node and to transmit return BFD echo packets with queue depth information appended thereto back to the originating node; a queue depth information generator configured to collect queue depth information; and a processor configured to append the queue depth information to the outgoing BFD echo packets. Other apparatus and methods are disclosed.

The application provides a network fault repair method and system based on multi-protocol detection, and relates to the technical field of network communication, which comprises the following steps: collecting link layer discovery protocol, address resolution protocol, routing table and bidirectional forwarding detection session state information; constructing a directed graph model comprising a plurality of nodes and links; identifying a primary path of current traffic according to the bidirectional forwarding detection session state information, and determining a fault link segment according to the primary path; generating a dynamic state identifier set according to the address resolution protocol, the routing table and the fault link segment; and generating a candidate optimized path according to the directed graph model and the dynamic state identifier set. Three key states, i.e., forwarding reachability, policy blocking and link fault, are accurately identified. The dynamic state identifier set truly reflects the actual carrying capacity of a link to service traffic, and fundamentally avoids the problem of traffic black hole after switching caused by misjudgment of routing reachability, i.e., forwarding reachability.

This application provides an adaptive bidirectional forwarding detection sending method, receiving method, and apparatus. The method includes: a first network device sending a service packet to a second network device, the service packet including an INT packet header, the INT packet header being used to carry an INT BFD control message.

The invention provides a method for determining tunnel connectivity. The method is applied to a first communication device supporting BFD (Bidirectional Forwarding Detection). The method comprises the following steps: generating and sending a first message, wherein the first message is a BFD (Bidirectional Forwarding Detection) message which is initiated by single-end equipment and is used for detecting the connectivity of a bidirectional tunnel; the first message comprises outer-layer tunnel information, inner-layer tunnel information and BFD control information. The outer-layer tunnel information indicates a first tunnel from the first communication device to the second communication device, and the inner-layer tunnel information indicates a second tunnel from the second communication device to the first communication device. The first tunnel and the second tunnel are IP tunnels. If both the first tunnel and the second tunnel have no fault, the first message is finally forwarded to the first communication device based on the outer-layer tunnel information and the inner-layer tunnel information, and correspondingly, the first communication device can determine the connectivity of the two-way tunnel. By using the scheme, even if the IP tunnel only comprises a single endpoint to support the BFD technology, the connectivity of the bidirectional tunnel can be determined.

The application discloses a fault processing method and device based on linkage of VRRP and BFD, equipment and storage medium, relates to the technical field of network communication, and comprises the following steps: when detecting that a BFD module is faulty, adjusting heartbeat messages of a VRRP module according to a preset heartbeat detection instruction to obtain target heartbeat messages; performing link detection according to the target heartbeat messages to obtain a detection result; and when the detection result is a link exception, triggering the VRRP module to perform route switching. The technical problem of how to maintain the rapid detection capability of a virtual route redundancy protocol for a link fault in the case of failure of a bidirectional forwarding detection module is solved; the linkage control hub actively takes over the link detection responsibility after the failure of the bidirectional forwarding detection module, upgrades heartbeat detection of the virtual route redundancy protocol from a basic mode to an enhanced mode, and therefore the link fault sensing capability is still maintained in the case of absence of the bidirectional forwarding detection module.

The present disclosure relates to a control method, system and interactive terminal of a bidirectional forwarding detection session, and relates to the technical field of network security. The method of the present disclosure comprises: a first interactive terminal adding a first sequence identifier and a first response identifier in a first BFD session message, wherein the first sequence identifier is a unique identifier of this message interaction, and the first response identifier is set as a value representing no response; the first interactive terminal sending the first BFD session message to a second interactive terminal; the first interactive terminal receiving a second BFD session message sent by the second interactive terminal, wherein the second BFD session message comprises a second sequence identifier and a second response identifier; and the first interactive terminal determining that the second BFD session message is a response message of the first BFD session message in the case that the second sequence identifier is the same as the first sequence identifier and the second response identifier is set as a value representing a response.

The embodiment of the invention provides a BFD (Bidirectional Forwarding Detection) processing device, a BFD processing method and related equipment. The BFD processing device comprises a configurable logic device and a storage device, the configurable logic device comprises an analysis configuration unit; the memory device includes a memory cell; the analysis configuration unit is used for executing configuration operation, and the configuration operation comprises the following steps: configuring corresponding BFD session information in the storage unit after a BFD configuration message is obtained; wherein the BFD session information comprises BFD session parameters and a BFD state machine; and the storage unit is used for storing the multiple pieces of BFD session information configured by the analysis configuration unit. Configuration logic for executing configuration operation and BFD session information are decoupled, an analysis configuration unit is arranged on a configurable logic device, the configuration operation of all BFD sessions is executed, the BFD session information does not need to be integrated on the configurable logic device, occupation of lookup table resources and trigger resources is greatly reduced, and the BFD session configuration efficiency is improved. Therefore, the routing fault detection of a large number of BFD sessions is realized.

The application provides a link detection method and device, and relates to the technical field of communication. The method comprises the following steps: for each private network address in an address pool used for load balancing, a bidirectional forwarding detection (BFD) packet is sent to a network device corresponding to the private network address; a response packet of each BFD packet sent by the network device is received; a state of the network device represented by each response packet received within a set time is confirmed; if the state represented by more than a first set number of response packets within the set time is an inactive state, it is confirmed that a link between a load balancing device and the network device is unavailable; and if the state represented by more than a second set number of response packets within the set time is an active state and the state represented by a third set number of recently received response packets is an active state, it is confirmed that the link between the load balancing device and the network device is available.

The invention provides a multi-VRRP group and ECMP collaborative load adjustment method and system, and belongs to the technical field of network communication, and the method comprises the steps: generating a plurality of ECMP equivalent paths according to an ECMP protocol principle, creating a corresponding VRRP group for each ECMP equivalent path, establishing a mapping relation between the ECMP equivalent paths and the VRRP groups, and constructing an annular main / standby topological structure among a plurality of virtual routers; according to an extended routing protocol, realizing cross-VRRP group state synchronization, and generating a global VRRP state information table; establishing a bidirectional forwarding detection session on each ECMP equivalent path, and periodically collecting quality parameters from the global VRRP state information table; constructing a dynamic weight model, calculating and constructing the dynamic weight model based on the collected quality parameters, and obtaining and normalizing the weight value of each ECMP equivalent path; detecting service flow, identifying a DSCP field, and dividing service types; and based on the weight value and the service type of each ECMP equivalent path, establishing a differentiated flow scheduling strategy, and dynamically adjusting the ECMP equivalent paths.

Embodiments of the present application relate to the field of communication, and disclose a seamless bidirectional forwarding detection method and system, a node and a storage medium. In the present application, the bit position of the Flags field in the SRH header of the SBFD probe packet is preset, so that the node / device receiving the target IPv6 packet in the transmission process can identify that the target IPv6 packet carries the SBFD probe packet, and then the node can modify the link addresses corresponding to each node in the transmission path recorded in the SRH header corresponding to the SBFD probe packet, so that the SBDF probe packet reaches the reflection node, and the reflection node can generate a corresponding backhaul path according to the modified transmission path, thereby realizing the consistency of the coming and going paths.

A node of a network includes a network interface configured to receive incoming bidirectional forward detection (BFD) echo packets from an originating node and to transmit return BFD echo packets with performance metrics appended thereto back to the originating node. The node also includes a performance metrics generator configured to collect the performance metrics related to at least the node and a processor configured to append the performance metrics to the outgoing BFD echo packets. Other apparatus and methods are disclosed herein.

The embodiment of the invention provides a seamless bidirectional forwarding detection method and device, a forwarding node and a medium, and relates to the technical field of communication, and the method comprises the steps that when a to-be-detected path is an annular path, the forwarding node initiating SBFD generates a first SBFD message, the first SBFD message comprises a first remote identifier field, and the first remote identifier field is a first remote identifier field; the first far-end identifier field carries a session home-end identifier on the forwarding node; and sending the first SBFD message along the annular path. According to the scheme, the problems of detection failure and high forwarding node pressure when SBFD is carried out on an annular path can be solved.

A method, apparatus, and system for adaptively adjusting the BFD detection threshold, relating to the field of communication technology, are disclosed. The method includes: configuring a Connection Fault Management (CFM) function; establishing at least one Maintenance Association (MA), with each MA bound to a service type; periodically collecting link quality data of the link using maintenance endpoints (MEPs) deployed on the link; calculating the network quality score of the link based on the link quality data and the weights corresponding to the service types associated with each MA; determining the bidirectional forwarding detection (BFD) threshold corresponding to the link based on the network quality score; and updating the detection parameters of the BFD session based on the BFD detection threshold to perform fault detection on the link. This invention enables the BFD detection mechanism to adaptively adjust according to the real-time quality status of the network.