CN106301835B - BFD link establishing method and device and router - Google Patents
BFD link establishing method and device and router Download PDFInfo
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- H—ELECTRICITY
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- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
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- H—ELECTRICITY
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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Abstract
The invention provides a BFD link establishing method, a BFD link establishing device and a router, wherein the method comprises the following steps: configuring the BFD state into an on-line state, and starting timing; when a message is received, if the specified time is exceeded, BFD link establishment fails, if the specified time is not exceeded, the received message is detected, and if the message is a P set link establishment message or an F set link establishment message, detection period negotiation is carried out; if the message is a message with the P bit and the F bit not set and carrying the on-line state, judging whether the detection period negotiation is successful, if so, keeping alive the message with the P bit and the F bit not set and carrying the on-line state, wherein BFD link establishment is successful, and if not, not processing the message with the P bit and the F bit not set and carrying the on-line state. The invention triggers BFD link establishment by utilizing the first packet, has simple realization and strong operability, does not need additional messages and additional flow and can effectively avoid link switching faults.
Description
Technical Field
The present invention relates to the field of network communication, and more particularly, to a Bidirectional Forwarding Detection (BFD) link establishment method, a device thereof, and a router.
Background
In modern society and continuous progress of science and technology, more and more real-time video and voice services run on an IP network, and an increasingly important index of network equipment is that communication faults between adjacent systems are required to be detected quickly, so that a substitute channel can be established or other links can be switched to more quickly when a fault occurs, thereby ensuring the stability of network communication.
The emergence of the Bidirectional Forwarding Detection (BFD) protocol provides a solution for the rapid detection of communication failures. BFD is capable of fault detection on any type of path between systems including direct physical links, virtual circuits, tunnels, MPLS (Multi-Protocol Label Switching) LSPs (Label switched paths), Multi-hop routing paths, and indirect paths. The BFD realizes simple and single fault detection, and after establishing a link through a three-way handshake mechanism, the BFD can provide connectivity detection of the link in two directions back and forth by continuously sending a quick detection message (millisecond level) to the other side. BFD informs the upper protocol stack of the fault on the forwarding path detected quickly, so that the upper protocol stack can be converged quickly, and the carrier class (within 50 milliseconds) of the service flow is triggered to be switched quickly, thereby reducing the packet loss of the link and ensuring the continuous and stable communication.
BFD plays a great role in maintaining network stability, but any object has a positive side and a negative side, the stability of BFD is also related to the stability of the network, and in the current complex communication network, the oscillation of BFD which is not a link problem often causes the continuous switching of a network communication link, so that packet loss is caused, the network communication is out of control, and serious consequences are caused. Especially when the network device configures large-capacity BFD, the BFD on the protocol stack is UP, but the bottom chip is not ready to send fast packet, although the link itself has no fault, the packet receiving chip can not recognize the received! P &! If the fast packet is not sent yet, the packet receiving chip is triggered to keep alive by the up message of the protocol stack, and the BFD link establishment is successful at this time, but the BFD does not negotiate, and after the detection period, the BFD cannot receive! P &! The message F will determine the link failure and report Down (disconnection), which results in link switching, BFD oscillation, and serious network failure.
Disclosure of Invention
The invention aims to provide a BFD link establishment method, a BFD link establishment device and a router to ensure stability of BFD link establishment.
In order to solve the above technical problem, the present invention provides a bidirectional forwarding detection BFD link establishment method, which includes:
configuring the BFD state into an on-line state, and starting timing;
when a message is received, if the specified time is exceeded, BFD link establishment fails, if the specified time is not exceeded, the received message is detected, and if the message is a P set link establishment message or an F set link establishment message, detection period negotiation is carried out; if the message is a message with the P bit and the F bit not set and carrying the on-line state, judging whether the detection period negotiation is successful, if so, keeping alive the message with the P bit and the F bit not set and carrying the on-line state, wherein BFD link establishment is successful, and if not, not processing the message with the P bit and the F bit not set and carrying the on-line state.
Further, the method also has the following characteristics: the configuring the BFD state to an online state includes:
sending a link establishment message carrying an offline state;
after receiving a link establishment message carrying an offline state sent by an opposite terminal, switching a local state to an initial state, and sending the link establishment message carrying the initial state;
and after receiving a link establishment message carrying an initial state and sent by the opposite terminal, switching the local state to an online state.
Further, the method also has the following characteristics: after the BFD status is configured to be the online status, the method further includes:
and sending a message which is not set at the P bit and the F bit and carries an online state to the opposite end.
Further, the method also has the following characteristics: the performing detection period negotiation includes:
after receiving a P setting link establishment message sent by an opposite terminal, sending an F setting link establishment message to the opposite terminal to perform detection period negotiation with the opposite terminal;
and after receiving the F setting link establishment message sent by the opposite terminal, informing the BFD to update the detection period of the local terminal.
In order to solve the above problem, the present invention further provides a device for bidirectional forwarding detection BFD link establishment, wherein the device comprises:
the protocol module is used for configuring the BFD state into an online state and starting timing; the device is used for receiving the P position link establishment message or the F position link establishment message to carry out detection period negotiation, and the received messages which are not set at the P position and the F position and carry an online state are not processed;
the packet receiving module is used for failing BFD link establishment if specified time is exceeded when a message is received, detecting the received message if the specified time is not exceeded, and forwarding the link establishment message to the protocol module if the message is a P set link establishment message or an F set link establishment message; if the message is a message which has no set P bit and no set F bit and carries an on-line state, judging whether the detection period negotiation is successful, if so, forwarding the message to a keep-alive module, and if not, forwarding the message to a protocol module;
and the keep-alive module is used for keeping alive the received messages which are not set at the P bit and the F bit and carry the on-line state, and the BFD link establishment is successful.
Further, the device also has the following characteristics: the protocol module, configuring the BFD status to the online status, includes: sending a link establishment message carrying an offline state; after receiving a link establishment message carrying an offline state sent by an opposite terminal, switching a local state to an initial state, and sending the link establishment message carrying the initial state; and after receiving a link establishment message carrying an initial state and sent by the opposite terminal, switching the local state to an online state.
Further, the device also has the following characteristics: also comprises a packet sending module which is used for sending packets,
the protocol module is used for configuring the BFD state into an on-line state and then informing the packet sending module,
and the packet sending module is used for sending a message which is not set at the P bit and the F bit and carries an online state to the opposite terminal.
Further, the device also has the following characteristics: the protocol module, performing detection cycle negotiation, includes: after receiving a P setting link establishment message sent by an opposite terminal, sending an F setting link establishment message to the opposite terminal to perform detection period negotiation with the opposite terminal; and after receiving the F setting link establishment message sent by the opposite terminal, informing the BFD to update the detection period of the local terminal.
In order to solve the above problem, the present invention further provides a router, wherein the router includes the BFD chaining apparatus.
In summary, the present invention provides a BFD link establishment method, a device and a router thereof, which trigger the BFD link establishment by using the first packet, and have the advantages of simple implementation, strong operability, no need of additional messages and additional traffic, and effectively avoiding that the BFD is sent by a protocol! P &! And triggering link establishment by the F protocol message, thereby causing link switching failure caused by oscillation.
Drawings
The accompanying drawings, which are described herein to provide a further understanding of the invention, are included in the following description:
FIG. 1 is a schematic diagram of a prior art BFD type;
FIG. 2 is a diagram illustrating BFD chain establishment of two devices in the prior art;
FIG. 3 is a schematic diagram of a BFD link establishment device according to an embodiment of the present invention
Fig. 4 is a flowchart of a BFD link establishment method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 3 is a schematic diagram of a BFD link establishment apparatus according to an embodiment of the present invention, and as shown in fig. 3, the apparatus of this embodiment includes: a protocol module, a keep-alive module, a packet receiving module and a packet sending module, wherein,
the protocol module is used for configuring the BFD state into an online state and starting timing; the device is used for receiving the P position link establishment message or the F position link establishment message to carry out detection period negotiation, and the received messages which are not set at the P position and the F position and carry an online state are not processed;
the packet receiving module is used for failing BFD link establishment if specified time is exceeded when a message is received, detecting the received message if the specified time is not exceeded, and forwarding the link establishment message to the protocol module if the message is a P set link establishment message or an F set link establishment message; if the message is a message with neither the P bit nor the F bit set and carrying an on-line state, judging whether the detection period negotiation is successful, if so, forwarding the message with neither the P bit nor the F bit set and carrying the on-line state to a keep-alive module, and if not, forwarding the message with neither the P bit nor the F bit set and carrying the on-line state to the protocol module;
and the keep-alive module is used for keeping alive the received messages which are not set at the P bit and the F bit and carry the on-line state, and the BFD link establishment is successful.
In a preferred embodiment, the protocol module, configuring the BFD status to the online status includes: sending a link establishment message carrying an offline state; after receiving a link establishment message carrying an offline state sent by an opposite terminal, switching a local state to an initial state, and sending the link establishment message carrying the initial state; and after receiving a link establishment message carrying an initial state and sent by the opposite terminal, switching the local state to an online state.
In a preferred embodiment, the apparatus further comprises: also comprises a packet sending module which is used for sending packets,
the protocol module is used for configuring the BFD state into an on-line state and then informing the packet sending module,
and the packet sending module is used for sending a message which is not set at the P bit and the F bit and carries an online state to the opposite terminal.
The negotiating, by the protocol module, the detection period may include: after receiving a P setting link establishment message sent by an opposite terminal, sending an F setting link establishment message to the opposite terminal to perform detection period negotiation with the opposite terminal; and after receiving the F setting link establishment message sent by the opposite terminal, informing the BFD to update the detection period of the local terminal.
The embodiment of the invention provides a BFD link establishment method, which mainly triggers BFD link establishment through a keep-alive first packet. The flow of BFD link establishment in this embodiment is completed by the combined action of the protocol stack (equivalent to the above protocol module), the packet sending chip (equivalent to the above packet sending module), the packet receiving chip (equivalent to the above packet receiving module), and the keep-alive chip (equivalent to the above keep-alive module). The protocol stack performs link establishment and check period negotiation on BFD according to three-way handshake; the packet sending chip is used for sending the keep-alive fast packet; the packet receiving chip is used for receiving the packet forwarded by the protocol stack and the packet sending chip and sending the packet to the protocol stack or the keep-alive chip according to the requirement; the keep-alive chip is used for keeping-alive BFD.
The protocol stack configures the link states of BFD to be up states through a three-way handshake process, a timer (for example, 5s) is started, a packet receiving chip detects a received message, and a received P/F message (P set message or F set message) informs the protocol stack of negotiation of a detection period. Just after waiting for the P/F negotiation at both ends to complete, when the first! P &! And F, identifying the packet as a keep-alive fast packet, and starting to forward the message to a keep-alive chip for keep-alive.
If it is received before the negotiation of the detection period at both ends of the session ends! P &! F message, only will! P &! F message is sent to protocol stack and waiting for P/F negotiation to end; if the P/F negotiation is completed, the! P &! F, when the timer reaches 5s, the BFD directly fails to build a link.
| A P &! The F message is a BFD message which is not provided with a P zone bit and an F zone bit and is carried with an up state, and two types of messages are included in the BFD link establishment process! P &! One of the messages is a message carrying the up state sent by a protocol stack, and the other is a keep-alive message sent by a packet sending chip.
Fig. 4 is a flowchart of BFD link establishment according to an embodiment of the present invention, as shown in fig. 4, including the following steps:
s301: configuring large-capacity BFD on Router (Router) A and Router B at two ends of a network, wherein the BFD type can be hop-across or direct-connected;
s302: the protocol stack changes the BFD state of two ends from Down state to Up state through three-way handshake process; the specific process is shown in fig. 2:
router A and Router B start BFD, the respective initial state is down, and BFD messages with the down carrying state are sent; router A and Router B receive the BFD message with the down state, the local state is switched to init, and the BFD message with the init state is sent; and the Router A and the Router B receive the BFD message with the state of init, and the local state is switched to up.
For example, 1000 BFD detections may be configured at both ends of the network as required, to check the states at both ends of the session 1, and the protocol stacks at both ends send link establishment messages carrying the up state each other, and the states at both ends of the session are up.
S303: starting a 5s timer by the keep-alive chips of Router A and Router B, and if BFD is not successfully established after 5s, failing to establish a link;
the timer may also be started by other chips such as a protocol stack.
S304: the Router A and the Router B mutually transmit messages carrying the up state, and the protocol stacks of the Router A and the Router B transmit a P setting link establishing message to an opposite terminal;
s305: packet receiving chips of Router A and Router B detect and analyze received messages;
the packet receiving chip receives two types of messages in the link establishment process: a link establishing message sent by a protocol stack and a message sent by a packet sending chip. The link establishment message sent by the protocol stack comprises: a link establishment message carrying a Down state, a link establishment message carrying an INIT (initial) state, a link establishment message carrying an UP state, a link establishment message carrying a P bit, and a link establishment message carrying a F bit, wherein the link establishment message carrying the UP state is! P &! F, message; the message sent by the packet sending chip is! P &! And F, keeping alive message is used for keeping alive of the keep alive chip.
S306: the Router B packet receiving chip receives the message, judges whether the time of the timer exceeds 5S, if so, the step S307 is carried out, and if not, the step S308 is carried out;
s307: if the timer exceeds 5s, the direct link establishment fails;
s308: the Router B packet receiving chip detects the received message and judges whether the message is a result of the detection! P &! F, if yes, turning to step S309; if not, go to step S310;
s309: the message received by the packet receiving chip is! P &! The message F needs to judge whether the protocol stack negotiation detection period is successful, if not, the step S11 is switched to; if successful, go to step S12;
s310: the packet receiving chip receives the P setting message or the F setting message, and the step S11 is switched;
s311: informing the protocol stack to process, the protocol stack receiving the P/F to negotiate the detection period, for! P &! The message F is not processed, and then the step S305 is carried out;
the negotiation of the detection period when the protocol stack receives the P/F message is specifically as follows:
if the Router B packet receiving chip receives the P-set negotiation message sent by the Router A, the Router B protocol stack is informed, the Router B protocol stack sends the F-set negotiation message to the Router A, and the Router B protocol stack negotiates with the Router A for a detection period; when receiving the F setting negotiation message sent by Router B, the Router A packet receiving chip informs the Router A protocol stack, and the Router A protocol stack informs BFD to update the detection period of the home terminal; RouterA negotiates OK;
when receiving the negotiation message of the P setting sent by Router B, the Router A packet receiving chip informs a Router A protocol stack, and the Router A protocol stack sends the negotiation message of the F setting to Router B and negotiates with Router B for a detection period; when receiving the F setting negotiation message sent by Router A, the Router B packet receiving chip notifies a Router B protocol stack, and the Router B protocol stack notifies BFD to update the detection period of the home terminal; router B negotiates OK;
and the protocol stacks of Router A and Router B detect the period negotiation completion. The packet receiving chips at both ends continue to detect the received message until the first! P &! F, BFD message;
s312: the protocol stacks of Router A and Router B negotiate the detection period successfully, and the home terminal is informed to update the detection period;
s313: the protocol stacks of Router A and Router B are successfully negotiated in detection period, and the packet receiving chip receives the negotiation result! P &! F, detecting that the fast packet is forwarded to a keep-alive chip;
s314: the keep alive chip uses the received! P &! F, detecting the fast packet to keep alive;
s315: BFD successfully builds a link and starts to detect the connectivity of the link.
And the BFD starts normal detection, and when the fast packet sent by the opposite end cannot be received in the detection period, the failure of the link in the middle of the BFD is judged, so that the down is notified to the protocol stack, the protocol stack can be rapidly converged and switched, and the stable communication of the network is ensured.
If the P/F negotiation is unsuccessful within 5s, or has not been received after the P/F negotiation was successful! P &! And F, in the fast packet message, BFD judges that the link has a fault and fails to establish the link.
In summary, the method of the embodiment of the present invention proposes to trigger BFD link establishment by using the first packet, and is simple to implement, strong in operability, and free of additional messages and additional traffic. Thus, the present invention is applicable to a typical scenario: on the equipment configured with large-capacity BFD, a large amount of messages are issued at the same time, due to the limitation of the performance of bottom layer hardware, the protocol stack BFD is UP, the packet receiving chip can not recognize! P &! Whether the F message is a keep-alive message or not, in this case, only the P/F negotiation at both ends of BFD is completed and the first | is received after the negotiation is completed! P &! The F message is a keep-alive message, and the BFD can successfully establish a link only by triggering the message, so that the condition that the BFD is sent by a protocol! P &! And triggering link establishment by the F protocol message, thereby causing link switching failure caused by oscillation.
It will be understood by those skilled in the art that all or part of the steps of the above methods may be implemented by instructing the relevant hardware through a program, and the program may be stored in a computer readable storage medium, such as a read-only memory, a magnetic or optical disk, and the like. Alternatively, all or part of the steps of the above embodiments may be implemented using one or more integrated circuits. Accordingly, each module/unit in the above embodiments may be implemented in the form of hardware, and may also be implemented in the form of a software functional module. The present invention is not limited to any specific form of combination of hardware and software.
The foregoing is only a preferred embodiment of the present invention, and naturally there are many other embodiments of the present invention, and those skilled in the art can make various corresponding changes and modifications according to the present invention without departing from the spirit and the essence of the present invention, and these corresponding changes and modifications should fall within the scope of the appended claims.
Claims (9)
1. A Bidirectional Forwarding Detection (BFD) link establishment method comprises the following steps:
configuring the BFD state into an on-line state, and starting timing;
when a message is received, if the specified time is exceeded, BFD link establishment fails, if the specified time is not exceeded, the received message is detected, and if the message is a P set link establishment message or an F set link establishment message, detection period negotiation is carried out; if the message is a message which has no set P bit and no set F bit and carries an on-line state, judging whether the detection period negotiation is successful, if so, keeping alive the message which has no set P bit and no set F bit and carries the on-line state, BFD link establishment is successful, and if not, not processing the message which has no set P bit and no set F bit and carries the on-line state.
2. The method of claim 1, wherein: the configuring the BFD state to an online state includes:
sending a link establishment message carrying an offline state;
after receiving a link establishment message carrying an offline state sent by an opposite terminal, switching a local state to an initial state, and sending the link establishment message carrying the initial state;
and after receiving a link establishment message carrying an initial state and sent by the opposite terminal, switching the local state to an online state.
3. The method of claim 2, wherein: after the BFD status is configured to be the online status, the method further includes:
and sending a message which is not set at the P bit and the F bit and carries an online state to the opposite end.
4. The method of any one of claims 1-3, wherein: the performing detection period negotiation includes:
after receiving a P setting link establishment message sent by an opposite terminal, sending an F setting link establishment message to the opposite terminal to perform detection period negotiation with the opposite terminal;
and after receiving the F setting link establishment message sent by the opposite terminal, informing the BFD to update the detection period of the local terminal.
5. An apparatus for Bidirectional Forwarding Detection (BFD) chaining, comprising:
the protocol module is used for configuring the BFD state into an online state and starting timing; the device is used for receiving the P position link establishment message or the F position link establishment message to carry out detection period negotiation, and the received messages which are not set at the P position and the F position and carry an online state are not processed;
the packet receiving module is used for failing BFD link establishment if specified time is exceeded when a message is received, detecting the received message if the specified time is not exceeded, and forwarding the link establishment message to the protocol module if the message is a P set link establishment message or an F set link establishment message; if the message is a message which has no set P bit and no set F bit and carries an on-line state, judging whether the detection period negotiation is successful, if so, forwarding the message to a keep-alive module, and if not, forwarding the message to the protocol module;
and the keep-alive module is used for keeping alive the received messages which are not set at the P bit and the F bit and carry the on-line state, and the BFD link establishment is successful.
6. The apparatus of claim 5, wherein:
the protocol module, configuring the BFD status to the online status, includes: sending a link establishment message carrying an offline state; after receiving a link establishment message carrying an offline state sent by an opposite terminal, switching a local state to an initial state, and sending the link establishment message carrying the initial state; and after receiving a link establishment message carrying an initial state and sent by the opposite terminal, switching the local state to an online state.
7. The apparatus of claim 6, wherein: also comprises a packet sending module which is used for sending packets,
the protocol module is used for configuring the BFD state into an on-line state and then informing the packet sending module,
and the packet sending module is used for sending a message which is not set at the P bit and the F bit and carries an online state to the opposite terminal.
8. The apparatus of any one of claims 5-7, wherein:
the protocol module, performing detection cycle negotiation, includes: after receiving a P setting link establishment message sent by an opposite terminal, sending an F setting link establishment message to the opposite terminal to perform detection period negotiation with the opposite terminal; and after receiving the F setting link establishment message sent by the opposite terminal, informing the BFD to update the detection period of the local terminal.
9. A router comprising an arrangement according to any of claims 5-8.
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| CN201510272081.5A CN106301835B (en) | 2015-05-25 | 2015-05-25 | BFD link establishing method and device and router |
| PCT/CN2015/088151 WO2016187980A1 (en) | 2015-05-25 | 2015-08-26 | Bfd link establishment method and apparatus, and router |
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| CN102780593A (en) * | 2012-07-25 | 2012-11-14 | 中兴通讯股份有限公司 | BFD (Bidirectional Forwarding Detection) protocol-based link detection method and apparatus and network processor |
| CN104104644A (en) * | 2013-04-01 | 2014-10-15 | 中兴通讯股份有限公司 | Bidirectional forwarding detection system and detection time configuration method of bidirectional forwarding detection |
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| WO2016187980A1 (en) | 2016-12-01 |
| CN106301835A (en) | 2017-01-04 |
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