CN1773952A - Bandwidth gurantee method for communication equipment or high-priority messaging during network at fault - Google Patents
Bandwidth gurantee method for communication equipment or high-priority messaging during network at fault Download PDFInfo
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Abstract
A method of ensuring wideband for high priority message at fault of communication device or network includes carrying out expansion of stream classification rule to includes fault of said device or network as part of rule and setting up relevant actions, sensing fault and carrying out relevant action to limit flow rate of low priority flow rate and to ensure transmission of high priority flow rate or to limit flow rate of high priority flow rate properly and to ensure transmission of most high priority flow rate totally.
Description
Technical field
The present invention relates to communication technical field, the bandwidth ensuring method of high priority message when relating in particular to a kind of communication equipment or network failure.
Background technology
RPR (RESILIENT PACKET RING, RPR network) technology is a kind of emerging looped network technology that has self-healing function, because it has efficiently, safety, advantage such as stablizes, so be used widely.Be illustrated in figure 1 as RPR ring schematic diagram, the RPR ring is the radio network of similar Ethernet, Ethernet token ring in the past (Token Ring) is compared, RPR efficient is than higher, being mainly reflected in RPR is the purpose deletion, and Token Ring is the source deletion, promptly when a unicast message transmits on ring, RPR is as long as arrive the destination later on just from encircling deletion this message (for example the message of node A-＞Node B will be deleted in Node B, can not take the bandwidth of Node B-C-D-A); Token just deletes message (such as the message that sends from node A-＞B, need through node A-B-C-D-A, ability is deleted) after then needing this message is sent to the source node that sends message.
The interior ring and the outer shroud of RPR ring all are unidirectional traffics, transmit data to fixing direction.The another one function of RPR is that it has self-healing function when fault.When node of RPR ring breaks down, two streams, F were arranged originally as supposition among Fig. 1
Ac: node A walks outer shroud (A-＞D-＞C), F to the flow of C
Dc: node D directly walks outer shroud to C by node D to flow D-＞C of C.
When the optical fiber between node D, the C was disconnected, node D can be automatically with the flow loopback, and promptly the flow from outer shroud will enter interior ring at node D place, temporarily be sent to node C by interior ring, generally claim Wrap (loopback).The flow of this moment is: F
Ac: A-＞D-＞A-＞B-＞C; F
Dc: D-＞A-＞B-＞C;
As shown in Figure 2, after the loopback, equipment can select ring (ring or outer shroud in walking) again according to the network topological information of newly learning, and behind the choosing ring, two flows are: F again
Ac: ring transmitted in A-＞B-＞C walked; F
Dc: D-＞A-＞B-＞C, give C through interior environment-development, this process is called Steering (turning to).
In the troubleshooting of Miao Shuing, when changes in flow rate, can and superpose from the flow of Node B originally in the above,, then will produce congested in Node B if this flow-rate ratio is bigger to C.Because general RPR ring all is core net or backbone network, network utilization is generally all than higher, so just mean that the congested meeting that produces in Node B is very serious.Under the extreme case, it may be 2 times of RPR monocycle flow even more.In switching, because the variation of flow inevitably some packet losses can take place, key is after the choosing ring (flow walk in encircle after), network all keeps moving in this state within may be for a long time, waits connection of breaking or the node that breaks down to be resumed always.How guaranteeing under so congested situation that the high priority message is not dropped, will be a bigger problem.
Prior art when congested, can adopt the fair algorithm technology that these high priority messages are guaranteed on the RPR ring.This fair algorithm also comes into force when fault not (congested not serious when generally not having fault).Also illustrate with top example, as shown in Figure 1, when the RPR ring does not have fault, if A-＞D-＞C has flow (to be referred to as F
Ac), D-＞C also has flow (to be referred to as F simultaneously
Dc); Two flow sums go up the total bandwidth of transmission greater than ring, will produce congested at node D like this.Fair algorithm will temporarily suppress the flow that node D goes up ring, send congested back-pressure message to node A simultaneously, tell node A link congestion, will reduce F after node A receives
AcFlow, thus unimpeded on the ring guaranteed.When congested in the above, suppress or not high-priority traffic in the flow of node D, guaranteed that like this high priority message can not be dropped.When breaking down on the ring, congested in the Node B generation as shown in Figure 3, start fair algorithm equally, similar under mechanism and the previously described normal condition.
Fair algorithm uses under normal discharge, the good algorithm of can yet be regarded as.But in actual applications, find under the ring failure condition, (to suppose that still the optical fiber between node D, the C is disconnected), as shown in Figure 3, work as F
Ac(sending to the flow of C from node A through B) and F
BcWhen (sending to the flow of C from Node B) is all very big, on ring for 2.5G, from issuing multicast that the 1G arranged+600M high priority+2.4G low priority of node A to C, Node B is to 400M high priority and the 1.6G low priority in addition of C, according to fair algorithm, should abandon low priority, guarantee high priority.When also having a large amount of multicasts (adopting the broadcast transmission form) flow simultaneously on the ring, between the node C heavy congestion can appear in Node B.
At this moment use fair algorithm, the situation of high priority message and a small amount of packet loss of high priority multicast message has appearred in discovery, by analysis, be owing to encircle (as 2.5G) for RPR at a high speed, the Buff (buffer memory) that comprises the chip of fair algorithm on the node is big inadequately, big congested the causing that can not absorb burst.Because the high priority message generally is important message (such as voice flow), the high priority multicast message generally is a video flowing.A small amount of packet loss may cause that video/audio is unintelligible, is unallowed in actual applications therefore.Under the special congestion situation, can't guarantee high priority packet loss not fully in actual the realization.This defective is (but the needing to revise chip design) that can solve by the buffer memory that increases node R PR chip.
In addition, when the high-priority traffic addition on the ring greater than malfunction under during utilizable bandwidth, the situation of high priority packet loss will inevitably occur, and, all packet loss can occur for the high-priority traffic of stack.As shown in Figure 3, when the optical fiber between node D, the C was disconnected, node D, A, B gave the flow of node C and walk interior ring, supposed that this ring is the RPR ring of 2.5G.If F
DcThe high priority that comprises 1G in (node D is to the flow of C), F
AcIn comprise the high priority of 1G, F
BcIn comprise the high priority message of 1G again, these flows under the not congested situation of ring, F
DcWalk outer shroud and directly send to C, F
BcC is given in environment-development in walking, no matter F
AcWalk Node B (interior ring), or F
AcWalk node D (outer shroud), all be no more than 2.5G, so high priority can not be dropped.Under the malfunction, node C was given in environment-development in above flow was all walked, and the flow between Node B, the C is greater than 2.5G (with being 3G) like this, and at this moment fair algorithm will cause 3 to flow all packet losses; This is actually, and the user is reluctant to see, the user wishes under this state, reduce some high-priority traffic and realize the not strategy of packet loss of whole net height priority, rather than all may packet loss.
When high-priority traffic surpassed the capacity of ring under the failure condition, packet loss all may appear in all high priorities, and technology is insurmountable at present in this case.
Summary of the invention
Technical problem to be solved by this invention is: overcome existing RPR and encircle when breaking down, the defective of packet loss appears in the high priority message, the bandwidth ensuring method of high priority message when a kind of communication equipment or network failure are provided, thus high priority message packet loss prevented, improve the reliability of network.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
The bandwidth ensuring method of high priority message when a kind of communication equipment or network failure, may further comprise the steps: at first the rule of traffic classification is expanded, part as flow classification rule and setting and the corresponding action of described rule are taken place in communication equipment or network failure; When breaking down, fault is carried out perception, to corresponding action, low-priority traffic is taked flow restriction according to rule match, guarantee the transmission of high-priority traffic; Or simultaneously high-priority traffic is suitably limited, guaranteeing that most high-priority traffic is complete passes through.
Described flow classification rule and action can realize that in communication equipment Access Control List (ACL) comprises at least one group of rule and motion combination by Access Control List (ACL).Described communication network can be RPR network.Described communication equipment is can be by artificial setting rule, and the speech ciphering equipment, transmission equipment or the access device that can the perception fault take place.Described action can comprise: mark, flow restriction or filtration again.
For communication equipment or network, have under the situation of more than one rank faults, can different faults be defined respectively, when different fault ranks takes place, take different actions.For malfunction or other perception of failure level, can pass through agreement, the automatic perception of signal by communication equipment, or directly be provided with by artificial.
Beneficial effect of the present invention is: the invention solves the defective that existing fair algorithm brings, for especially big congested down to the bad situation of high priority assurance, in the present invention, can pass through broad sense ACL, to low priority flows when fault takes place, by carrying out predefined CAR action, limit its transmission; Under malfunction, high priority surpasses the problem of ring capacity, use the present invention, can guarantee the normal forwarding of most high priority messages by the priority that reduces partial service, so just solved the phenomenon generation that all high priority messages all might be lost the part bag under the former failure condition, guarantee the transmission of high-priority service effectively, improve the reliability of network.
Utilize the present invention, can prevent and planning in advance, thereby solve the problem of high-priority service packet loss initiatively, effectively the malfunction that may occur.
Description of drawings
Fig. 1 is the flow schematic diagram of RPR ring normal condition lower node A to C and D to C;
Fig. 2 is the flow schematic diagram of RPR ring malfunction lower node A to C and D to C;
Flow schematic diagram when Fig. 3 breaks for optical fiber between RPR link point D, C.
Embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
In router and other data communication products, in order to realize that different stream is carried out different processing, need be to message processings of classifying, abbreviation traffic classification.Traffic classification is meant the certain rule of feature construction with message, according to this rule, by searching of table or tree, message is divided into different class (stream), is about to the process that the data field is divided into different stream.Existing flow classification techniques, its principal character is that the element of traffic classification all derives from message self, such as 5 property fields: the IP destination address from IP (Internet protocol) message self, IP source address, (load of IP message carrying) protocol type, the destination interface of TCP (transmission control protocol) or UDP (User Datagram Protoco (UDP)), 5 tuples that source port constituted of TCP or UDP, perhaps increase DSCP territory (the Diffserv codepoint in the IP head, be the differentiated services coding) formation 6 tuples, perhaps more polynary group etc. all is to be that feature is classified with the part territory in the heading.After the classification, to the different line identifiers that flows to, then the stream of different identification is taked different processing, this processing is called " action ", as filter, be redirected, sampling, mark, flow restriction (CAR) etc. again.Traffic classification and action realize by ACL that in data communications equipment ACL comprises one group or the combination of organizing rule (rule) and action (Actions) more.Rule i.e. the property field of a stream, and for example: purpose IP address is that 2.2.2.2 can constitute a rule for the 1.1.1.1+ source address.
Adopt a kind of traffic classification method of broad sense in the present invention, promptly the element and the action of classification are expanded, the element of classification will no longer just derive from message itself, the feature of some equipment, route characteristic or can be increased to wherein with the message feature that it doesn't matter fully; Simultaneously action is also expanded.As can be with the element of " link 1 disconnected " this incident as a traffic classification, the flow of the incoming interface of correspondence is taked action, rule can be: IP SA1+ outlet is disconnected for RPR mouth+link 1.IP SA1 refers to the source IP address of an IP bag, and when " link 1 is disconnected " do not take place, the rule of configuration (rule) can not be matched like this, and corresponding action does not take place; When " link 1 is disconnected " takes place, can take corresponding action, guarantee the high priority message.
On the interface that encircles on each node, ISP (Internet Service Provider, i.e. ISP) has used differential service (DiffServ) to distinguish high and low priority query at present.Differential service is used 6 (being called the DSCP territory) in 8 in TOS (COS) territory in the IP head, stream can be divided into 64 classes altogether, at present standard definition 6 classes: EF (Expedited Forwarding), AF1～AF4 (Assured Forwarding) and BE (BestEfrort), other keeps at present.Wherein EF is a limit priority, and AF1～AF4 is the priority of user oneself definition, and BE is a lowest priority.
The present invention adopts broad sense traffic classification method, when fault is given birth in environment-development, low-priority traffic is taked flow restriction, guarantees the transmission of the flow of high priority; Simultaneously high-priority traffic is suitably limited, guaranteeing that most high-priority traffic is complete passes through.Traffic classification and action realize by ACL (Access Control List (ACL)) in data communications equipment.
The present invention expands the rule in the traffic classification, and some conditions are increased in the rule, and RPR node failure (Topology Discovery of RPR agreement can perception whether fault has taken place) is taken place as a regular part.For example: purpose IP address is that the RPR mouth just constitutes a rule for the 1.1.1.1+ source address for 2.2.2.2+RPR fault generation+message outgoing interface.Fault accounts for 1 bit in reality realizes.Fault is 1 when taking place, and is 0 when fault does not take place.Like this, when fault takes place, data message will match preset rule.
Each rule and action all link together, and the action of using comprises:
1) mark (Remark) again: the priority of the specific stream that traffic classification is come out all is set at the priority of appointment, can improve or reduce the priority of bag like this.Again mark has comprised the mark in the TOS territory to the IP head, the 802.1p territory of VLAN, the Exp territory of MPLS etc.
2) flow restriction CAR (Committed Acess Rate): carry out bandwidth constraints according to user configured speed convection current, what surpass bandwidth can carry out discard processing.
3) filter: i.e. dropping packets.
Action is to use like this: at first according to rule match to a list item, the effect of rule is divided into not homogeneous turbulence with packet exactly, the action identification that has corresponding stream to carry out in the list item that matches, according to the order of action identification and execution, the action that puts rules into practice.Such as rule be: IP source address 1.1.1.1, other territory Any, the meaning of Any is for arbitrarily, the corresponding action of this rule is: filter, the meaning that is the user is to be 1.1.1.1 with source IP address, the whole discard processing of stream that purpose IP address and other traffic classification element are arbitrary value.If the source IP address of a message is 1.1.1.1, when searching ACL traffic classification table, it will find this list item, and the content of list item is a filter action, and this message will be dropped then.
Following mask body describes for example:
When ring breaks down, the fault on the very fast discovery ring of the consultation of RPR self, and know loopback (Wrap) taken place that beginning is the choosing ring again.After choosing encircles again, enter the stable state under a kind of malfunction, actual ring is at this moment gone up the bandwidth before utilizable bandwidth has been far smaller than fault, when network design, maximum for real time business (flow of limit priority) is known, (the one-way transmission ability such as the 2.5G ring is 5G during greater than the general bandwidth of RPR at this flow, when the direction high-priority traffic addition of going to a node during greater than 5G), can realize abandoning or reduce its priority by configuration broad sense traffic classification to individual flows.
Among the present invention, rule as can disposing:
Rule1:IP SA1+ outlet takes place for fault on RPR mouth+RPR ring
Can dispose an action of getting in touch with its:
Action1：Remark?to?BE
Rule1 and Action1 are applied on all non-rpr interfaces (Rule and Acction form an ACL, and this ACL can work to all data of router, also can work to certain port or interface.Be applied on all non-rpr interfaces, promptly all non-rpr interfaces worked, because the flow of this rule control is a flow of giving the RPR port, and do not control flow) so will be applied on all non-RPR ports from the RPR port.
When fault takes place, the protocol module of RPR can be revised the fault generation flag bit in the forwarding, this part that is masked as Key (keyword) removes to search the table (perhaps tree) that Rule constitutes, message on all have come self-application this regular interface, find this rule with the capital of this rule match, carry out respective action then, own priority is reduced to BE.So just reduced the bandwidth of high priority message, thereby made the bandwidth of total high priority message within the band width in physical allowed band, guarantee that most high priority messages can correctly be transmitted.Reduce priority and can set to which rank of, what adopt here is to be reduced to BE level (BestEffort) can also be reduced to other rank such as AF1 etc.
Nonserviceable down, this moment, the portions of bandwidth of RPR ring was congested, and the user should know the upward ratio of the flow of planning of ring, in advance so can know how to set rule in advance when configuration rule.Because the flow on the RPR is all by encircling on other interface, and RPR generally is backbone network, thus on other interface all according to the planning flow, carried out last circulation quantitative limitation.For congested especially situation, also can reduce the rank of part high priority, thereby guarantee that prior high priority passes through by rule, this rule can be accomplished; Equally, when high-priority traffic surpasses bandwidth under failure condition, should dispose, under failure condition, reduce processed, be equivalent to this part flow has been carried out some discard processing the unessential relatively high-priority traffic of part.
This programme can also be expanded, and the rank of fault is defined (for example a connection is broken and is the fault one-level, and two specific connections are broken and are the fault secondary), when different fault ranks takes place, the row major level that flows to of varying number is reduced.For example: when RPR encircles a node failure 5 high priority flows are reduced to low priority; During two node failures 10 high priority flows are reduced to low priority etc.
Popularization is come, and for the fault of other communication equipment, also can use like this, such as speech ciphering equipment, transmission equipment, access device or the like, these communication equipments be by manually can preestablishing rule, and these rules can its effect when fault takes place, and can perceive fault and take place.Especially afterwards in the IP Telecommunication Network and related access equipment, the bandwidth of a lot of MPLS (exchange of multi-protocols sign) network is known, just is more suitable for using the present invention to control on the RPR ring.
The present invention also can use two cover formations, use two cover parameters.Use set of parameter under the normal condition, under the failure condition,, adjust the queue number of formation, reach the purpose of adjusting bandwidth by the broad sense traffic classification.
The fault of the network that the present invention can form predictable communication equipment or communication equipment by using the broad sense traffic classification, is provided with action or parameter that a cover is fit to fault, uses the transmission of assurance important service when fault takes place.For same priority or with a kind of message of business, when it surpasses actual transfer capability under the failure condition, also can pass through preset parameters or allocation plan, again bandwidth, priority etc. is configured, reach and guarantee the more purpose of important service.For communication equipment or network the situation of multiple rank fault is arranged, many cover parameters or schemes can be set; According to the rank of the actual generation of fault, use corresponding parameters or scheme automatically.For the perception of fault rank and malfunction, it is autosense to be that communication equipment passes through means such as agreement, signal, such as automatic perception of RPR agreement of front etc.; Also can be artificial directly setting,, directly be set to x level malfunction etc. by order line equipment such as by manual intervention.
The invention solves the defective that existing fair algorithm brings, for especially big congested down to the bad situation of high priority assurance, in the present invention, can pass through broad sense ACL, low priority flows when fault takes place, by carrying out predefined CAR action, is limited its transmission; Under malfunction, high priority surpasses the problem of ring capacity, use the present invention, can guarantee the normal forwarding of most high priority messages by the priority that reduces partial service, so just solve the phenomenon generation that all high priority messages all might be lost the part bag under the former failure condition.For example,, a channel can be abandoned (closing), but guarantee that other channel can use if the high priority multicast is the IPTV flow.
The present invention can adopt the method for distinguishing malfunction and normal condition, and (for example RPR ring fault can be passed through the protocol layer perception of RPR; Certain node temperature is too high can to pass through the temperature sensor perception, notifies control plane then) in advance the malfunction that may occur is prevented and planning in advance, thereby initiatively, deal with problems effectively.
Those skilled in the art do not break away from essence of the present invention and spirit, can there be the various deformation scheme to realize the present invention, the above only is the preferable feasible embodiment of the present invention, be not so limit to interest field of the present invention, the equivalent structure that all utilizations specification of the present invention and accompanying drawing content are done changes, and all is contained within the interest field of the present invention.
Claims (7)
1, the bandwidth ensuring method of high priority message when a kind of communication equipment or network failure is characterized in that, may further comprise the steps:
Rule to traffic classification is expanded, and a part as flow classification rule and setting and the corresponding action of described rule are taken place for communication equipment or network failure;
When breaking down, fault is carried out perception, to corresponding action, low-priority traffic is taked flow restriction according to rule match, guarantee the transmission of high-priority traffic; Or simultaneously high-priority traffic is suitably limited, guaranteeing that most high-priority traffic is complete passes through.
2, the bandwidth ensuring method of high priority message when communication equipment according to claim 1 or network failure, it is characterized in that: described flow classification rule and action realize by Access Control List (ACL) that in communication equipment Access Control List (ACL) comprises at least one group of rule and motion combination.
3, the bandwidth ensuring method of high priority message when communication equipment according to claim 1 and 2 or network failure, it is characterized in that: described communication network is a RPR network.
4, the bandwidth ensuring method of high priority message when communication equipment according to claim 3 or network failure, it is characterized in that: described communication equipment is for can be by artificial setting rule, and the speech ciphering equipment, transmission equipment or the access device that can the perception fault take place.
5, the bandwidth ensuring method of high priority message when communication equipment according to claim 3 or network failure, it is characterized in that: described action comprises: mark, flow restriction or filtration again.
6, the bandwidth ensuring method of high priority message when communication equipment according to claim 3 or network failure, it is characterized in that: for communication equipment or network, have under the situation of more than one rank faults, different faults is defined respectively, when different fault ranks takes place, take different actions.
7, the bandwidth ensuring method of high priority message when communication equipment according to claim 3 or network failure, it is characterized in that: for malfunction or other perception of failure level, pass through agreement, the automatic perception of signal by communication equipment, or directly be provided with by artificial.
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| CN103931147B (en) * | 2011-11-14 | 2017-05-24 | 英特尔公司 | Path diversity in a connection-oriented network |
| CN103931147A (en) * | 2011-11-14 | 2014-07-16 | 英特尔公司 | Path diversity in a connection-oriented network |
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