CN102025616B - Method, device and switch for realizing BFD (Bidirectional Forwarding Detection) - Google Patents
Method, device and switch for realizing BFD (Bidirectional Forwarding Detection) Download PDFInfo
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Abstract
The invention relates to the field of data communication, in particular to a method, a device and a switch for realizing BFD (Bidirectional Forwarding Detection) on an LACP (Link Aggregation Control Protocol) link by utilizing software. The method of the invention comprises the following steps of: receiving a negotiation message for establishing a BFD dialogue by a main control board through the LACP link, successfully negotiating, confirming a line card for processing the BFD dialogue and broadcasting the confirmed line card to various line cards of the LACP link; and receiving the broadcasting by a line card and sending the BFD message corresponding to the BFD dialogue to terminal equipment or receiving the BFD message corresponding to the BFD dialogue from the terminal equipment by the line card when it is confirmed that the line card is the line card for processing the BFD dialogue.
Description
Technical field
The present invention relates to data communication field, especially relate to a kind of method, device and switch that two-way converting detects of realizing.
Background technology
The detection of BFD(two-way converting) a effect is between adjacent forwarding engine (comprising interface, data link and the expansion engine that some are possible), by setting up path (path), provides the inefficacy method for detecting in a kind of low load, short detecting cycle.The another one effect of BFD is to provide a kind of independently detecting mechanism that can move on any protocol level, any medium.
At present, the BFD of distributed system has two kinds of software realization mechanisms:
One, master control borad is processed the centralized approach of all BFD messages.Be that negotiation packet, detection messages and transmission message are all processed by master control borad.Advantage is: all messages are all processed by master control borad, supports the BFD of any three layers of link, comprises the BFD based on LACP.Shortcoming is: 1, can not meet switch performance requirement, line card receives that message first send master control, is detected and is given out a contract for a project by master control, then being forwarded by line card.BFD requires very high to message real-time performance, adopt quick asynchronous message, but still do not reach the performance requirement of 10ms although exchange message between master control borad and line card.2, can not meet specification requirement.At present, a video card is supported 128 session(sessions), 12 line cards are supported 1536 session, are spaced apart 100ms the detection time of each session, the message of master control borad detection per second and transmission will reach 15360, substantially exceed the disposal ability of master control borad.3, master control borad will be processed a large amount of messages, can cause master control borad cpu busy.Master control borad is processed message BFD message up sending master control borad limited in one's ability, a large amount of, can cause the cpu busy of master control borad, and each business module all cannot normally be used.
For addressing the above problem, the general BFD detection that adopts following manner to realize distributed system in prior art.Concrete methods of realizing is: master control borad is only processed negotiation packet, consults successfully rear session and is carried out detection messages, sent message by line card.Such advantage is: negotiation packet separates processing with detection messages and transmission message, negotiation packet is not high to requirement of real-time, by master control borad, focused on, detection messages and transmission message are processed by some line cards, and needn't be transmitted to master control borad, process, real-time performance is greatly improved, and has reduced the requirement to master control borad CPU disposal ability.In current distribution switch system, mostly adopt this processing mode.
But the BFD adopting in this way detects, and does not support the business demand based on LACP.The application of LACP is at present more and more, and the demand therefore BFD based on LACP being detected is also more and more higher.At present, member port based on LACP has same plate and across two kinds of situations of version, and the session establishment of BFD is at which line card, from which member port send, and as part member port down, and other member port up, BFD this how to process be all the problem need solving.Therefore, existing master control borad is only processed the BFD detection method of negotiation packet, does not support the business demand based on LACP.
Summary of the invention
The invention provides a kind of method, device and switch that two-way converting detects of realizing, can utilize software on the interface of LACP link, to realize BFD function.
Realize the method that two-way converting detects, comprising:
After master control borad is received and is set up the negotiation packet of BFD session and consults successfully by LACP link, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
Described line card receives after broadcast, when determining, self is the line card of processing this BFD session, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
A switch, comprising:
Master control borad, for after receiving by LACP link and setting up the negotiation packet of BFD session and consults successfully, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
At least one line card, for receiving described broadcast, and self is the line card of processing this BFD session when determining, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
Realize the device that two-way converting detects, comprising:
Determination module, for after receiving by LACP link and setting up the negotiation packet of BFD session and consults successfully, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
Processing module, receives after broadcast for online clamping, when determining, self is the line card of processing this BFD session, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
The method that realizes two-way converting detection that the embodiment of the present invention provides, after master control borad is received the negotiation packet of BFD and is consulted successfully by LACP link, can from line card corresponding to this LACP link, determine that a line card is as the line card of treatments B FD session, and the line card of treatments B FD session is identified by broadcasting to each line card, the line card of this treatments B FD session sends BFD message corresponding to BFD session or receives the BFD message that opposite equip. sends to opposite equip..Adopt the method, make only need to process under the prerequisite of negotiation packet at master control borad, also can utilize software on LACP LI(link interface), to realize BFD function.
Accompanying drawing explanation
The method flow diagram of realizing two-way converting detection that Fig. 1 provides for the embodiment of the present invention;
The flow chart of the line card at the renewal BFD session place that Fig. 2 provides for the embodiment of the present invention;
Two inter-exchanges that Fig. 3 provides for the embodiment of the present invention are realized the handling process schematic diagram that two-way converting detects;
The structure chart of message between the BFD plate that Fig. 4 provides for the embodiment of the present invention;
The structure chart of the BFD session announcement message that Fig. 5 provides for the embodiment of the present invention;
The structure chart of the switch that Fig. 6 provides for the embodiment of the present invention;
The structure chart of realizing the device that two-way converting detects that Fig. 7 provides for the embodiment of the present invention.
Embodiment
Based on the existing distributed BFD method of utilizing software to realize, can not on LACP interface, realize BFD function, the embodiment of the present invention provides a kind of method that two-way converting detects that realizes, can only process under the prerequisite of negotiation packet at master control borad, under the LACP of LACP link interface, realize BFD function.
The method that realizes BFD that the embodiment of the present invention provides, after master control borad is received the negotiation packet of BFD and is consulted successfully by LACP link, can from line card corresponding to this LACP link, determine that a line card is as the line card of treatments B FD session, and the line card of treatments B FD session is identified by broadcasting to each line card, the line card of this treatments B FD session sends BFD message corresponding to BFD session or receives the BFD message that opposite equip. sends to opposite equip..Preferably, other line cards that this LACP link is corresponding receive after BFD message corresponding to this BFD session, determine that the BFD session that this BFD message is corresponding is not to be processed by this line card, the line card of processing this BFD session is determined in inquiry, and gives by this BFD message repeating the line card of processing this BFD session.
As shown in Figure 1, the method flow diagram of realizing two-way converting detection for the embodiment of the present invention provides, comprising:
After S101, master control borad are received and are set up the negotiation packet of BFD session and consults successfully by LACP link, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
S102, line card receive after broadcast, when determining, self are while processing the line card of this BFD session, send BFD message corresponding to this BFD session and receive the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
When line card, receive message and receive, determine it self is the line card of processing this BFD session, send BFD message and receive the corresponding BFD message of this BFD session to opposite equip. or from opposite equip.;
Preferably, above-mentioned steps also comprises:
S103, other line cards that this LACP link is corresponding receive BFD message corresponding to this BFD session, the line card of this BFD session of query processing, and this BFD message repeating is given to the line card of processing this BFD session.
When line card is received after broadcast, determine it self is not the line card of processing this BFD session, to opposite equip., do not send BFD message, and after receiving the BFD message of opposite equip. transmission, can inquiry determine the line card of processing this BFD session, and give by this BFD message repeating the line card of processing this BFD session.
Because for LACP link, local terminal sends to the BFD message of opposite end by LACP link, can be received by the arbitrary port of any line card of opposite equip., in like manner, the BFD message that opposite end sends, also can be received by the arbitrary port of any line card of local device corresponding to LACP link.When line card corresponding to LACP link receives after BFD message corresponding to this BFD session that opposite end sends, determine whether this BFD session is self line card processing, if not self line card, process, the line card of this BFD session of query processing, and give this line card by this BFD message repeating.
Above-mentioned steps is the foundation of BFD session and reception, transmission BFD message flow process, when processing the line card off-line of this BFD session or fault, needs to upgrade the line card (line card of treatments B FD session, hereinafter to be referred as the line card at BFD session place) of treatments B FD session.Below introduce in detail the flow chart of the line card that upgrades BFD session place.
LACP link in the present invention refers to the general designation of all links between the LACP member port of two neighbouring devices.
As shown in Figure 2, for upgrading the flow chart of the line card at BFD session place, comprising:
The line card timed sending session announcement message of S201, treatments B FD session is given other line cards corresponding to this LACP link;
Wherein, the object that sends session announcement message is to tell that other line cards, this line card are the processors of this BFD session, and preferably, the time interval that sends BFD message is identical with the time interval that sends session announcement message;
S202, other line cards receive session announcement message, within the time that other line cards are being set, do not receive session announcement message, determine that the line card of former processing BFD session breaks down or off-line;
S203, other line cards are determined separately from the line card as processing this BFD session, and are started to send session announcement message to other line cards of local terminal.
Wherein, when two or more line card, determine from the line card as processing this BFD session simultaneously, consult to determine that one of them line card is for processing the line card of this BFD session.The principle of consulting can be set as required, can set the line card of member's port numbers minimum for processing the line card of this BFD session, or member port number maximum line card, or some line cards of setting as required are wherein the line card of processing this BFD session.
Determine that some line cards are for processing the line card of this BFD session, the line card of this treatments B FD session continues to send BFD message to opposite equip..
Below in conjunction with concrete accompanying drawing, describe the scheme of the embodiment of the present invention in detail.
As shown in Figure 3, for two inter-exchanges that the embodiment of the present invention provides, realize the handling process schematic diagram that two-way converting detects, concrete process comprises:
The handling process of switch 1 of take describes as example, and concerning switch 2, its processing procedure is identical with switch 1, repeats no more here.
1) master control borad of switch 1 by between LACP link and switch 2 through consultation message negotiation set up BFD session, after consulting successfully, exchange opportunity determines according to route this BFD session by which line card on it is processed.For switch 1, its master control borad determines that this BFD session processed by line card 1, and for switch 2, its master control borad determines that this session processed by the line card 2 on it.
Wherein, the negotiations process between master control borad is prior art, is mainly the parameters such as transmission time interval of consulting BFD message, is not described in detail here.After consulting successfully, master control borad need be specified the line card that a line card in this LACP link is this BFD session of processing, and generally according to minimum principle, electing the line card that in LACP link, least member's port is corresponding is the line card of processing this BFD session, certainly, also can select as required line card.
When the master control borad of switch 1, determine that line card 1 is for after processing the line card of this BFD session, line card 1 can be noticed to each line card that this LACP link is corresponding for processing the information broadcast of this BFD session.
2) send BFD message
When line card 1 receives after the message of master control borad broadcast, determine from the line card as processing this BFD session, can send this BFD message to switch 2.
When other line cards (2,3) receive after the message of master control borad broadcast, determine it self is not the line card of processing this BFD session, do not send BFD message.
3) receive BFD message
When line card 1 receives after BFD message corresponding to this BFD session that opposite equip. sends, determine that this BFD session is that self processes, directly upgrade the time of reception of this session, and determine when this BFD message is UP message, directly abandon, when this BFD message is not UP message, this BFD message is reported to master control borad.
When other line cards (2,3) receive after BFD message corresponding to this BFD session that opposite equip. sends, determine it self is not the processor of this BFD session, inquiry determines that line card 1 is the processor of this BFD session, the BFD message of reception is directly transmitted to line card 1, line card 1 receives the BFD message that other line cards forward, the time of reception of this BFD session is upgraded, and determine when this BFD message is UP message, directly abandon, when this BFD message is not UP message, this BFD message is reported to master control borad.
Preferably, other line cards (2,3) receive after the BFD message of opposite equip. transmission, when definite BFD session corresponding to this BFD message processed by line card 1, this BFD message receiving are encapsulated as to message between BFD plate, and send to line card 1.Between BFD plate, message refers to the BFD message sending between each line card of a switch inside.
Wherein, between BFD plate, the structure chart of message as shown in Figure 4, specifically comprises:
DMAC: the MAC of source line card;
SMAC: the MAC of destination line card;
TYPE: type of message, two bytes, are defined as 0xeeee here, represent message between BFD plate;
BFD message content: the particular content of message between BFD plate, in full accord with the BFD message content receiving.
Wherein, the structure chart of BFD session announcement message as shown in Figure 5, specifically comprises:
DMAC: the MAC of source line card;
SMAC: the MAC of destination line card;
TYPE: type of message, two bytes, are defined as 0xeeef here, represent BFD session announcement message;
Session announcement message content: local terminal descriptor localDiser, 4 bytes; Remote descriptors remoteDiser, 4 bytes.
Process is above the foundation of BFD session and the flow process that sends, receive BFD message.Handling process while introducing line card 1 off-line or fault below.
Concrete handling process comprises:
1) when line card 1 is normally worked, timed sending session announcement message is given other line cards (2,3), and the object that sends session announcement message is to notify other line cards, and line card 1 is the processor who processes this BFD session.
2) other line cards (2,3) can regularly receive the session announcement message that line card 1 sends, and the time of reception of recording conversation notification packet.
When line card 1 off-line or while breaking down, line card (2,3) can not receive session announcement message, within the time that line card (2,3) is being set, do not receive the session announcement message that line card 1 sends, line card (2,3) is determined separately from the line card as processing this BFD session, line card 2,3 starts to send BFD message to opposite equip. separately, and sends session announcement message to other line card of LACP link.
Wherein, when line card (2,3) is determined from the processor as this BFD session simultaneously, line card 2, line card 3 can start to send session announcement message to other line cards simultaneously, it is the session announcement message that line card 2 can receive line card 3, line card 3 can receive the session announcement message of line card 2, and line card 2,3 can be according to former definite one of them line card of setting for processing the line card of this BFD session.Wherein, the principle of setting can be minimum principle, and electing the line card that slot number is little is processor, and the line card that slot number is large stops sending session announcement message automatically.Certainly, the principle of setting can be also other principles, can set arbitrarily as required.The principle of setting can directly send to each line card by master control borad, or by line card 1 sending while controlling message, the principle (being switching principle) of setting is sent to other line cards simultaneously, certainly, also can determine by consulting between other line cards.Line card 2,3 determines that one of them,, for processing the line card of this BFD session, continues to send BFD message to opposite equip., and other line card to LACP sends BFD session announcement message simultaneously, and another one line card stops sending BFD message and session announcement message automatically.
Preferably, 1) in, when line card 1 timed sending session announcement message is given other line cards, can also interval regular time, wherein, interlude is identical with the transmission time interval of BFD message; 2) in, while not receiving session announcement message in the time that other line cards are set, at least one interval time of the time of setting, be detection multiple-1 interval time of opposite equip. to the maximum.The detection multiple of opposite equip., refer to that opposite equip. does not receive BFD message within the time interval of this detection multiple, determine this LACP link failure, therefore, need to be before opposite equip. report fault, the session of line card 1 is switched to line card 2 or 3, and namely line card 2 or 3 will be determined line card 1 fault before opposite equip. report fault, and the time of setting is detection multiple-1 interval time of opposite equip. to the maximum.
Adopt the method for above-described embodiment, can only process negotiation packet at master control borad, each line card is responsible for sending and receiving under the prerequisite of BFD message, can on the interface of LACP link, realize BFD function.
The embodiment of the present invention also provides a kind of switch, as shown in Figure 6, comprising:
Master control borad 61, for after receiving by LACP link and setting up the negotiation packet of BFD session and consults successfully, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
At least one line card 62, for receiving described broadcast, and self is while processing the line card of this BFD session when determining, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
Preferably, line card 62, also for receiving BFD message corresponding to this BFD session, the line card of this BFD session of query processing, and this BFD message repeating is given to the line card of processing this BFD session.
Preferably, line card 62, also, for being while processing the line card of this BFD session when self, goes back timed sending session announcement message to other line cards corresponding to this LACP link; Or
Line card 62, also, for not being, while processing the line card of this BFD session, not receive described session announcement message within the time of setting when self, determines from the line card as processing this BFD session separately.
The embodiment of the present invention also provides a kind of device that two-way converting detects of realizing, and as shown in Figure 7, comprising:
Determination module 71, for after receiving by LACP link and setting up the negotiation packet of BFD session and consults successfully, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
Processing module 72, receives after broadcast for online clamping, when determining, self is while processing the line card of this BFD session, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (10)
1. realize the method that two-way converting detects BFD, it is characterized in that, comprising:
After master control borad is received and is set up the negotiation packet of BFD session and consults successfully by Link Aggregation Control Protocol LACP link, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
Described line card receives after broadcast, when determining, self is the line card of processing this BFD session, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
2. the method for claim 1, is characterized in that, also comprises:
Other line cards that this LACP link is corresponding receive BFD message corresponding to this BFD session, the line card of this BFD session of query processing, and this BFD message repeating is given to the line card of processing this BFD session.
3. the method for claim 1, is characterized in that, also comprises:
Also timed sending session announcement of the line card message of this BFD session of described processing is given other line cards corresponding to this LACP link;
Described other line cards do not receive described session announcement message within the time of setting, and determine from the line card as processing this BFD session separately.
4. method as claimed in claim 3, is characterized in that, also comprises:
When at least two line cards, determine from the line card as processing this BFD session simultaneously, consult or determine that according to the principle of setting one of them line card is for processing the line card of this BFD session.
5. method as claimed in claim 2, is characterized in that, the described line card of processing this BFD session that this BFD message repeating is given, is specially:
Other line cards corresponding to this LACP link, by the BFD message receiving, are encapsulated as message between BFD plate, and send to the line card of processing this BFD session.
6. method as claimed in claim 5, is characterized in that, between described BFD plate, message comprises: MAC, type of message and the message content of the MAC of destination line card, source line card.
7. a switch, is characterized in that, comprising:
Master control borad, for after receiving by Link Aggregation Control Protocol LACP link and setting up two-way converting and detect the negotiation packet of BFD session and consult successfully, determine to process the line card of this BFD session, and by definite line card by broadcasting to each line card of LACP link;
At least one line card, for receiving described broadcast, and self is the line card of processing this BFD session when determining, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
8. switch as claimed in claim 7, is characterized in that, described line card, and also for receiving BFD message corresponding to this BFD session, the line card of this BFD session of query processing, and this BFD message repeating is given to the line card of processing this BFD session.
9. switch as claimed in claim 7, is characterized in that, described line card also, for being while processing the line card of this BFD session when self, is gone back timed sending session announcement message to other line cards corresponding to this LACP link; Or
Described line card, also, for not being, while processing the line card of this BFD session, not receive described session announcement message within the time of setting when self, determines from the line card as processing this BFD session separately.
10. realize the device that two-way converting detects BFD, it is characterized in that, comprising:
Determination module, for after receiving by Link Aggregation Control Protocol LACP link and setting up the negotiation packet of BFD session and consults successfully, the line card of definite this BFD session of processing, and by definite line card by broadcasting to each line card of LACP link;
Processing module, receives after broadcast for online clamping, when determining, self is the line card of processing this BFD session, sends BFD message corresponding to this BFD session and receives the corresponding BFD message of this BFD session to opposite equip. or from opposite equip..
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| CN106301840B (en) * | 2015-05-27 | 2020-09-15 | 中兴通讯股份有限公司 | Method and device for sending Bidirectional Forwarding Detection (BFD) message |
| CN106301871A (en) * | 2015-06-25 | 2017-01-04 | 中兴通讯股份有限公司 | A kind of forwarding detection (BFD) method based on lacp and system |
| CN107534576B (en) * | 2015-06-27 | 2020-03-31 | 华为技术有限公司 | Link recovery method and network equipment |
| CN107493209A (en) * | 2017-09-12 | 2017-12-19 | 安徽皖通邮电股份有限公司 | The processing unit and method of a kind of bidirectional forward detection report |
| CN107612754B (en) * | 2017-10-30 | 2021-07-06 | 新华三技术有限公司 | Bidirectional forwarding link fault detection method and device and network node equipment |
| CN108600040B (en) * | 2018-03-16 | 2022-03-15 | 国电南瑞科技股份有限公司 | Distributed system node fault detection method based on high-availability detection node |
| CN110875880B (en) * | 2018-08-29 | 2022-03-25 | 北京华为数字技术有限公司 | Data transmission method, related equipment, system and computer storage medium |
| CN109787860B (en) * | 2019-01-15 | 2021-05-07 | 新华三技术有限公司 | Bidirectional forwarding link detection method and device |
| CN109547274A (en) * | 2019-01-28 | 2019-03-29 | 新华三技术有限公司 | A kind of enclosure board switching method, device and first network equipment |
| CN109756399A (en) * | 2019-02-18 | 2019-05-14 | 新华三技术有限公司 | A kind of BFD session maintaining method and distributed apparatus |
| US10805193B1 (en) * | 2019-04-30 | 2020-10-13 | Juniper Networks, Inc. | Faster fault-detection mechanism, for example using bidirectional forwarding detection (BFD), on network nodes and/or hosts multihomed using a link aggregation group (LAG) |
| CN114221879A (en) * | 2021-11-18 | 2022-03-22 | 锐捷网络股份有限公司 | Keep-alive detection method and device for MACsec channel |
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