CN103517155A - Flow dynamic control method and device based on monitor service - Google Patents
Flow dynamic control method and device based on monitor service Download PDFInfo
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Abstract
The invention provides flow dynamic control method and device based on a monitor service. The method is applied to a video management server VM. The method comprises the steps that A, the topology of an IP monitor network is acquired; B, link congestion alarm reported by a network forwarding device is received; C, when a live on demand request is received, the forwarding path of the on demand flow is determined according to a transmitting device and a receiving device of the on demand flow and the topology of the monitor network, and if more than two forwarding paths are comprised and one path comprises a congestion link, a policy issuing module is notified to issue policy routing; and D, the policy routing is issued to an access layer network forwarding device, so that the access layer network forwarding device transmits the on demand flow to a path without congestion. According to the technical scheme of the invention, the phenomenon of packet loss caused by link congestion of the IP video monitor network is effectively avoided.
Description
Technical field
The present invention relates to IP monitor network technical field, relate in particular to method and device that a kind of flow dynamics based on monitoring business is controlled.
Background technology
Along with video monitoring in people's life, apply more and more extensive, also can be more and more higher for the demand of IP video surveillance network.The message repeating of existing IP video surveillance network is substantially all forwarded by network forwarding equipment, when running into equal-cost link, be by hash algorithm by flow mean allocation to a plurality of links.But this hash algorithm is only effective at this link, the whole flow of the whole network is not had to perception and regulation and control.
Please refer to Fig. 1, wherein for network forwarding equipment A, B, C, D-F and E-F are equal-cost route.In network, the large or other reasons of flow-rate ratio causes the flow between network forwarding equipment E and F to occur congested, network forwarding equipment A, B, C but cannot perceive the congestion situation of E-F link, still flow can be issued to E, cause a large amount of messages to be dropped on network forwarding equipment E, and this " packet loss " phenomenon can make monitor video picture occur clamping stagnation or flower screen, thereby affected the visual effect of video monitoring.In order to guarantee how family, avoid the packet loss being caused by link congestion in IP video surveillance network to become our problem demanding prompt solution if obtaining the ageing and high-quality monitor video of monitor message.
Summary of the invention
In view of this, the invention provides a kind of flow dynamics control device based on monitoring business, this application of installation is in video management server VM, this server is applied to IP monitor network, this IP monitor network comprises: monitoring frontend, monitoring rear end equipment and network forwarding equipment, this device comprises: topology is known module, for obtaining the topology of IP monitor network; Link congestion is known module, the link congestion alarm reporting for receiving network forwarding equipment; Flow path judge module, for when receiving the live order request of monitoring rear end equipment, according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network, judge the forward-path of this program request flow, if described forward-path comprise two above and wherein one comprise congestion link; notification strategy issue module distributing policy route; Policy distribution module, to access layer network forwarding unit, makes this access layer network forwarding unit that this program request flow is sent to without on congested path for distributing policy route.
Design based on same, the present invention also provides a kind of flow dynamics control method based on monitoring business, the method is applied to video management server VM, this server is applied to IP monitor network, this IP monitor network comprises: monitoring frontend, monitoring rear end equipment and network forwarding equipment, and the method comprises: steps A, obtain the topology of IP monitor network; The link congestion alarm that step B, reception network forwarding equipment report; Step C, receive monitoring rear end equipment live order request time, according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network, judge the forward-path of this program request flow, if described forward-path comprise two above and wherein one comprise congestion link; notification strategy issue module distributing policy route; Step D, distributing policy route, to access layer network forwarding unit, make this access layer network forwarding unit that this program request flow is sent to without on congested path.
Compared with prior art, the present invention utilizes video management server VM to make up the deficiency that network forwarding equipment is known ability by Simple Network Management Protocol SNMP monitoring overall network topology, and can know in time the congested situation of IP monitor network link, by analysis after judgement, by packet loss phenomenon from link congestion to the mode of network forwarding equipment distributing policy route that avoid IP video surveillance network to be caused by.
Accompanying drawing explanation
Fig. 1 is a kind of IP monitor network schematic diagram;
Fig. 2 is the building-block of logic of a kind of dynamic flow control device based on monitoring business in embodiment of the present invention;
Fig. 3 is a kind of dynamic flow control method flow chart based on monitoring business in embodiment of the present invention;
Fig. 4 is that in embodiment of the present invention, a kind of dynamic flow based on monitoring business is controlled schematic diagram.
Embodiment
For video monitoring data is occurred when congested at the equal-cost link of IP video surveillance network, still can proper communication and can not be dropped, the present invention has increased the device that a kind of flow dynamics based on monitoring business is controlled on video management server VM.
Please refer to Fig. 2, Fig. 2 is the building-block of logic of a kind of dynamic flow control device based on monitoring business in embodiment of the present invention.This application of installation is in video management server VM, this server is applied to IP monitor network, this IP monitor network also comprises: monitoring frontend, monitoring rear end equipment and network forwarding equipment, should comprise by the dynamic flow control device 1 based on monitoring business: topology is known module 101, for obtaining the topology of IP monitor network; Link congestion is known module 102, the link congestion alarm reporting for receiving network forwarding equipment; Flow path judge module 103, for when receiving the live order request of monitoring rear end equipment, according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network, judge the forward-path of this program request flow, if described forward-path comprise two above and wherein one comprise congestion link; notification strategy issue module distributing policy route; Policy distribution module 104, to access layer network forwarding unit, makes this access layer network forwarding unit that this program request flow is sent to without on congested path for distributing policy route.
The tactful route that described policy distribution module 104 issues comprises source IP address, object IP address, outgoing interface, wherein source IP address and object IP address are respectively the IP address of monitoring frontend and monitoring rear end equipment, and outgoing interface is according to described two interfaces without congestion link that above forward-path is chosen by policy distribution module.Equal-cost link and the Link State of described two above forward-paths are recorded in equal-cost link table.
It should be noted that described equal-cost link obtains according to network topology, because network forwarding equipment in prior art is cannot the whole network condition of perception, so VM of the present invention can be known and be monitored overall network topology by Simple Network Management Protocol SNMP and makes up the deficiency that equal-cost route is known ability.So, we can easily obtain overall network topology, and know in time the congested situation of IP monitor network link.Link State is generally divided into normal and congested, knows module receive after link congestion alarm when link congestion, and notice VM is labeled as congestion state by link corresponding in equal-cost link table; Policy distribution module can be chosen according to the congestion state of mark and be labeled as normal equal-cost link distributing policy route in equal-cost link table, and the network forwarding equipment issuing, with the packet loss phenomenon of avoiding IP video surveillance network to be caused by link congestion.
In IP monitor network, after the processing of the invention process method, the pressure of former congestion link can reduce gradually, until while recovering normal condition, if still continue to be labeled as congestion state, can cause this link not to be used always, thereby increase the pressure of other links.Therefore,, when the congested recovery of network forwarding equipment is normal, it can know the alarm of module de-links to the link congestion of VM, and then recalls corresponding tactful route by policy distribution module.Former like this congestion link just can continue to have been used by user.
Please refer to Fig. 3, is the process chart of a kind of dynamic flow control method based on monitoring business in embodiment of the present invention.It is upper that the method is applied to video management server VM, and this server is applied to IP monitor network, and this IP monitor network comprises: monitoring frontend, monitoring rear end equipment and network forwarding equipment, and the method comprises:
Step 201, obtain the topology of IP monitor network;
The link congestion alarm that step 202, reception network forwarding equipment report;
Step 203, receive monitoring rear end equipment live order request time, according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network, judge on the forward-path of this program request flow whether have equal-cost link, if described forward-path comprises equal-cost link, forward step 205 to; If do not comprise equal-cost link, forward step 204 to;
Step 204, look into route forwarding table and forward;
In equal-cost link described in step 205, determining step 203, whether there is congestion link, if had, forward step 206 to; If, do not forward step 204 to;
Step 206, distributing policy route, to access layer network forwarding unit, make this access layer network forwarding unit that this program request flow is sent to without on congested path.
Because the present invention only processes the congested of equal-cost link in IP monitor network, but not network forwarding equipment on equal-cost link still carries out message repeating with the common route forwarding table of looking into.
With an example, one embodiment of the present invention are elaborated below.
Please refer to Fig. 4, is that in embodiment of the present invention, a kind of dynamic flow based on monitoring business is controlled schematic diagram.During system initialization, the topology of VM knows that module can know the network topology of the whole network.The approach that its topology is known has two, and the one, by administrator hand, set up a topological diagram, and be pre-stored in the internal memory of VM; The 2nd, VM first specifies a network forwarding equipment G who closes on as seed device, goes to obtain the information of other network forwarding equipments, thereby obtain the topological diagram of the whole network according to SNMP.And the equal-cost link in topology all can be added up in an equal-cost link table.
Under normal condition, if receive that the transmitting apparatus of program request flow and receiving equipment are respectively monitoring frontend and monitoring rear end equipment, network forwarding equipment A can be transmitted to network forwarding equipment F by equal-cost route D and E when forwarding so, finally by monitoring rear end equipment, is received.Now equal-cost route D and E are evenly distributed and are realized load sharing by HASH algorithm.
The flow of supposing network forwarding equipment E becomes greatly gradually, until when forwarding utilance and surpassing first threshold (as 80%), network forwarding equipment E can send link congestion alarm and know module to link congestion, informs its E-F link congestion.Link congestion knows that module receives after alarm, can in described equal-cost link table, to E-F link, be labeled as congestion link.When flow path judge module is received new program request flow request, suppose that transmitting apparatus and receiving equipment are still monitoring frontend and monitoring rear end equipment, judge the forward-path of this program request flow according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network.Through looking into equal-cost route table, find that the equal-cost link in forward-path has D-F link and E-F link, wherein D-F link is normal, E-F link is congestion state, so notification strategy issues module, to the access layer network forwarding unit A of front monitoring front-end, issues a tactful route, and its content is as shown in table 1.
| Source IP address | Object IP address | Outgoing interface |
| The IP address of front monitoring front-end | The IP address of monitoring rear end | D-F link |
Table 1
Comprising source IP address, object IP address, outgoing interface, wherein source IP address and object IP address are respectively the IP address of monitoring frontend and monitoring rear end equipment, outgoing interface be by policy distribution module according to one that chooses in described D-F link and E-F link without congestion link, what choose is D-F link herein.Then network forwarding equipment A receives after tactful route, will forward according to the link of indication in outgoing interface.So just avoided the packet loss being caused by E-F link congestion.
Also have a kind of situation, suppose when link is normal, the forward-path of program request flow from front monitoring front-end to monitoring rear end has been defined as A-E-F as shown in Figure 4, and the program request flow of video monitoring can transmit according to this forward-path so.But in this network, except access layer network forwarding unit A has flux and flow direction network forwarding equipment E, as network forwarding equipment B, C, may send some non-supervised service traffics to E, also can make the forwarding utilance of network forwarding equipment E raise gradually, occur packet loss phenomenon.
Now conventionally can to link congestion, know module alarm by network forwarding equipment E; link congestion knows that module receives after alarm; mark congestion link in equal-cost route table; and then notification strategy issues module distributing policy route; indicate the forward-path of former program request flow; as shown in Figure 4, thus make program request flow evade congestion link E-F.When monitoring rear end equipment can perceive data packet loss, also can send message to VM and inform on its forward-path have packet loss simultaneously.VM receives after the message of monitoring rear end equipment, makes link congestion know that module obtains rapidly the link congestion situation on described forward-path.So, the congestion condition of link E-F also can be known that module knows by link congestion.This dual congestion alarm measure and ensure ageing to all webs' watch of VM.
Because the flow on E-F link in a period of time reduces gradually, forward utilance and also can decrease.Below being reduced to Second Threshold, when (as 60%), link E-F is considered to recover normal condition.Therefore, we also will re-use E-F link, share the load of video surveillance network.Now still by network forwarding equipment E, to the link congestion of VM, know the alarm of module de-links, link congestion knows that module receives after de-links alarm, E-F in equal-cost link table is labeled as to normal condition, and then notification strategy issues module and to access layer network forwarding unit A, issues a corresponding New Policy route and go to recall former tactful route.Thereby make link E-F recover transfer capability.
Hence one can see that, the present invention utilizes VM to go to make up by simple gateway agreement SNMP monitoring overall network topology the deficiency that network forwarding equipment is known ability, and can know in time the congested situation of IP monitor network link, by analysis after judgement, by packet loss phenomenon from link congestion to the mode of network forwarding equipment distributing policy route that avoid IP video surveillance network to be caused by, improved the quality of video monitoring.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (8)
1. the flow dynamics control device based on monitoring business, this application of installation is in video management server VM, and this server is applied to IP monitor network, and this IP monitor network comprises: monitoring frontend, monitoring rear end equipment and network forwarding equipment, it is characterized in that, this device comprises:
Topology is known module, for obtaining the topology of IP monitor network;
Link congestion is known module, the link congestion alarm reporting for receiving network forwarding equipment;
Flow path judge module, for when receiving the live order request of monitoring rear end equipment, according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network, judge the forward-path of this program request flow, if described forward-path comprise two above and wherein one comprise congestion link; notification strategy issue module distributing policy route;
Policy distribution module, to access layer network forwarding unit, makes this access layer network forwarding unit that this program request flow is sent to without on congested path for distributing policy route.
2. device as claimed in claim 1, it is characterized in that, described tactful route comprises source IP address, object IP address, outgoing interface, wherein source IP address and object IP address are respectively the IP address of monitoring frontend and monitoring rear end equipment, and outgoing interface is to arrive by policy distribution module according to described two interfaces without congestion link that above forward-path is chosen.
3. device as claimed in claim 2, is characterized in that, equal-cost link and the Link State of described two above forward-paths are recorded in equal-cost link table; Equal-cost link obtains according to network topology, and Link State is divided into normal and congested, knows module receive after link congestion alarm when link congestion, and notice VM is labeled as congestion state by link corresponding in equal-cost link table; Policy distribution module is chosen and is labeled as normal equal-cost link distributing policy route in equal-cost link table.
4. device as claimed in claim 1, is characterized in that, when the congested recovery of network forwarding equipment is normal, its link congestion to VM is known the alarm of module de-links; By policy distribution module, recall corresponding tactful route.
5. the flow dynamics control method based on monitoring business, the method is applied to video management server VM, and this server is applied to IP monitor network, and this IP monitor network comprises: monitoring frontend, monitoring rear end equipment and network forwarding equipment, it is characterized in that, the method comprises:
Steps A, obtain the topology of IP monitor network;
The link congestion alarm that step B, reception network forwarding equipment report;
Step C, receive monitoring rear end equipment live order request time, according to the topology of the transmitting apparatus of this program request flow and receiving equipment and described monitor network, judge the forward-path of this program request flow, if described forward-path comprise two above and wherein one comprise congestion link; notification strategy issue module distributing policy route;
Step D, distributing policy route, to access layer network forwarding unit, make this access layer network forwarding unit that this program request flow is sent to without on congested path.
6. method as claimed in claim 5, it is characterized in that, described tactful route comprises source IP address, object IP address, outgoing interface, wherein source IP address and object IP address are respectively the IP address of monitoring frontend and monitoring rear end equipment, and outgoing interface is to arrive by policy distribution module according to described two interfaces without congestion link that above forward-path is chosen.
7. method as claimed in claim 6, is characterized in that, equal-cost link and the Link State of described two above forward-paths are recorded in equal-cost link table; Equal-cost link obtains according to network topology, and Link State is divided into normal and congested, knows module receive after link congestion alarm when link congestion, and notice VM is labeled as congestion state by link corresponding in equal-cost link table; Policy distribution module is chosen and is labeled as normal equal-cost link distributing policy route in equal-cost link table.
8. device as claimed in claim 5, is characterized in that, when the congested recovery of network forwarding equipment is normal, its link congestion to VM is known the alarm of module de-links; By policy distribution module, recall corresponding tactful route.
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