CN103414634A - Method and device for flooding service flow - Google Patents
Method and device for flooding service flow Download PDFInfo
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Abstract
An embodiment of the invention discloses a method and device for flooding service flow. According to the technical scheme, flooding MAC configuration based on a home terminal website edge device guarantees that the service flow of the home terminal website edge device can only be forwarded to a specific effective website, independence of each website is enhanced, safety of data communication is guaranteed, the possibility of being attacked is reduced greatly, therefore, the problem of flooding of the service flow in an EVI network among the websites and in the websites is solved, flooding is performed according to actual service requirements, only the websites which can provide effective service are allowed to perform flooding, unnecessary flooding flow and bandwidth loss are reduced, and normal communication of each website is guaranteed.
Description
Technical field
The present invention relates to communication technical field, particularly a kind of method and apparatus that floods of service traffics.
Background technology
A plurality of physical site that are positioned at diverse geographic location have been crossed over by current most enterprises network and data center thereof, and in the similar business of these site deployment.For management cost is integrated, reduced to the data center resources, usually can carry out virtual to the resource at data center.The Intel Virtualization Technology of data center mainly comprises this three aspects: content of network virtualization, Storage Virtualization and server virtualization.Wherein, server virtualization is on a physical server, to fictionalize many virtual machines by special-purpose virtualization software (as VMware), every virtual machine is independent operating all, has operating system, application program and the virtual hardware environment (comprising virtual CPU, internal memory, network interface card etc.) of oneself.In order to realize resource dynamic allotment and the management between website, virtual machine is wanted between the different websites of data center can free migration.As shown in Figure 1, be the schematic diagram of a kind of virtual machine (vm) migration scene of the prior art.Virtual machine can be at the Site(website) 1 server S erver(server) 1 and the server S erver2 of Site2 between move.Due to the virtual machine (vm) migration process, to user transparent, can not change the IP address, otherwise user's flowing of access can interrupt, so must realize that double layer network is interconnected being distributed between the website in strange land.
EVI(Ethernet Virtualization Interconnect, Ethernet is virtual interconnected) be " MAC in IP " technology of a kind of advanced person, it is a kind of two-layer VPN based on IP kernel heart net (Virtual Private Network, VPN (virtual private network)) technology.It can be based on existing service provider network and enterprise network, for the physical site of disperseing provides two layers of interconnecting function.EVI just safeguards route and forwarding information on the edge device of website, without the route and the forwarding information that change website inside and IP core network.
As shown in Figure 2, be the schematic diagram of a kind of EVI networking structure of the prior art.Network after deployment EVI is comprised of following three parts:
Station network: by one or the many edge of table equipment connection double layer network with separate traffic function to core network, usually controlled by individual enterprise's management, mainly formed by main frame and switching equipment.
The EVI network: the virtual network of setting up between the website edge device, provide two layers between station network interconnected.By the EVI network, mutually announce the MAC Address of the All hosts and the equipment that are connected to edge device between website, two layers that the interconnected formation of a plurality of websites is larger forward territories.
IP core network: mainly form, provide three layers of interconnected network between station network by the IP routing device.
By the EVI network, can realize VLAN(Virtual Local Area Network, VLAN) expansion (for example: the flow of in website Site1 VLAN10 expanded to website Site2 and Site3) of flow between different websites, the EVI network carrying the two laminar flow amounts of expansion VLAN between website.
The EVI technology has following advantage:
Separate between website: between website two layers interconnected after, the fault of certain website (as broadcast storm) can not be delivered to other website, the topology of different websites is independent of each other and relies on.
Specification requirement is low: only require that service provider network support IP gets final product, without other special technical requirement.
High reliability: the redundancy access of website is provided by many ownership, and has the mechanism of avoiding traffic loops between website.
High link service efficiency: thus the multicast between website and broadcast traffic are optimized the saving bandwidth fully, can realize load balancing when redundant link is arranged.
Flexibility: two layers of interconnected topological structure that does not rely on website between website do not have specific (special) requirements to the website topological structure.
Operation maintenance is simple, with low cost: only need to dispose at the website edge equipment of one or more support EVI functions, enterprise network and service provider network are without doing any change.And the configuration on the website edge device is simple, and deployment does not exert an influence to traffic forwarding.
In default situation, edge device only floods on the website internal interface in VLAN for the frame (comprising unknown unicast frame and unknown multicast frame) of unknown address, can not be flooded to other website.
For some specific data center business, with specific target MAC (Media Access Control) address, identify its service traffics, this MAC Address as the source MAC of Frame, can not be announced by the EVI Intermediate System to Intermediate System never between edge device.The intercommunication of flow between website in order to guarantee this class business, can configure the MAC Address that selectivity floods, and when the target MAC (Media Access Control) address of message mated this MAC Address, message can flood and be forwarded to other website by the EVI tunnel.This MAC is called as the MAC Address that selectivity floods.
In the process that realizes the technical scheme that the embodiment of the present invention proposes, the inventor finds that prior art has the following disadvantages:
After the configuration of local terminal website edge device floods MAC, when the target MAC (Media Access Control) address of service traffics mates this MAC Address, can be flooded to other all remote station edge devices with identical active vlan.Even the remote station edge device does not provide the ability of this service, also can receive these service traffics, occupied unnecessary bandwidth, affect the normal service communication of remote station edge device.
Summary of the invention
The embodiment of the present invention provides a kind of method and apparatus that floods of service traffics, has solved existing EVI Network Traffic amount between each website and the problem that can't flood as required in website.
For achieving the above object, one aspect of the present invention provides a kind of method that floods of service traffics, is applied in the virtual interconnected EVI network system of Ethernet, and described method comprises the following steps at least:
Local terminal website edge device configures various types of traffic under the EVI tunnel of self service traffics are forwarded to the required media access control MAC address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods, wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods;
The target MAC (Media Access Control) address of the flow received when described local terminal website edge device is that of configuring is while flooding MAC Address, described local terminal website edge device is determined the corresponding MAC address entries that floods of this MAC Address that floods, and according to the information recorded in the MAC address entries that floods, by described traffic forwarding to the corresponding website that effectively floods of this MAC Address that floods.
On the other hand, the present invention also provides a kind of route exchange device,, in the virtual interconnected EVI network system of Ethernet, comprises at least as site apparatus, being applied to:
Configuration module, service traffics for configuration various types of traffic under the EVI tunnel of described route exchange device are forwarded to the required MAC Address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods, wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods;
Receiver module, the flow sent be used to receiving other network equipments or route exchange device;
Determination module, be of configuring of described configuration module while flooding MAC Address for the target MAC (Media Access Control) address of the flow that receives at described receiver module, determines the corresponding MAC address entries that floods of this MAC Address that floods;
Forwarding module, for the information recorded according to the determined MAC address entries that floods of described determination module, by described traffic forwarding to the corresponding website that effectively floods of this MAC Address that floods.
Compared with prior art, the technical scheme that proposes of the embodiment of the present invention has the following advantages:
The technical scheme proposed by applying the embodiment of the present invention, the technical scheme proposed by applying the embodiment of the present invention, the MAC configuration that floods based on local terminal website edge device, the service traffics that guarantee local terminal website edge device only can be forwarded to specific effective website, independence between each website strengthens, ensured the fail safe of data communication, possibility under fire will reduce greatly, thereby, having solved EVI Network Traffic amount floods between each website and in website, by actual business demand, flood, only have the website that effective business service can be provided just to allow to flood, unnecessary flooding traffic and bandwidth loss have been reduced, guarantee the proper communication of each website.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of virtual machine (vm) migration scene of the prior art;
Fig. 2 is the schematic diagram of a kind of EVI networking structure in prior art;
Fig. 3 is the schematic flow sheet of the method that floods of a kind of service traffics of proposing of the embodiment of the present invention;
Fig. 4 is the schematic flow sheet of the method that floods of the service traffics under a kind of concrete application scenarios that proposes of the embodiment of the present invention;
Fig. 5 is the structural representation of a kind of route exchange device of proposing of the embodiment of the present invention.
Embodiment
As stated in the Background Art, in the prior art scheme, service traffics can be flooded to other all remote station edge devices with identical active vlan, in the situation that this remote station edge device does not provide the ability of this service, such forwarding obviously there is no need, therefore, such forwarding has occupied unnecessary bandwidth, affects the normal service communication of remote station edge device.
In order to solve such problem, the embodiment of the present invention has proposed a kind of method that floods of service traffics, mainly solve and realize that EVI Network Traffic amount floods to particular station (or certain interface of particular station) as required, only that is to say and flood to the website that business service can be provided, to other websites, do not flood, guarantee the validity of flow in the website, effectively prevented flow flooding in website and between website.
As shown in Figure 3, be the schematic flow sheet of the method that floods of a kind of service traffics proposed by the invention, the method is applied to, in the EVI network system, specifically comprise the following steps:
Step S301, local terminal website edge device configure various types of traffic under the EVI tunnel of self service traffics are forwarded to the required MAC Address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods.
Wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods.
It is to be noted, for local terminal website edge device, the process of setting up of each MAC address entries that floods is once that new list item is set up process, for the renewal of the content of this MAC address entries that floods according to concrete update time and regular difference being divided into following two kinds of situations:
Situation one, set up first the process of the MAC address entries that floods.
(1) be forwarded to required the flooding during MAC Address of remote equipment when the service traffics of a kind of new type of service of configuration under the EVI tunnel of described local terminal website edge device at self, described local device is set up the flood MAC address entries corresponding with this MAC Address that floods, the initial value of the information of the website that effectively floods that this MAC Address that floods recorded in the MAC address entries that floods of wherein, setting up is corresponding is default value.
Processing by this process, local terminal website edge device has completed the process of initially setting up of the MAC address entries that floods, in the MAC address entries that floods of setting up, stored type of service and the corresponding relation between MAC Address of flooding, it is pointed out that the type of service here and flooding between MAC Address is relation one to one.
Further, owing to being the process of initially setting up, its corresponding information that effectively floods website is vacancy, so, in the embodiment of the present invention, carry out temporary transient filling with default value.The information of the concrete website that effectively floods is obtain and upgrade by follow-up step.
(2) described local terminal website edge device carries the MAC information that floods of the described new type of service of solicited status in the one or more message that send to the remote station edge device, asks the information of effectively the flood website corresponding with this MAC Address that floods.
In the technical scheme that the present embodiment proposes, in fact the MAC information that floods be exactly a kind of information carrier and the sign of information interaction of website of effectively flooding between local terminal website edge device and remote station edge device, its corresponding state information has shown the effect of this MAC information that floods, if solicited status, for effectively flood the accordingly information of website of acquisition request, and if response status is issue and the renewal for the information of the website that effectively floods accordingly.
(3) described local terminal website edge device receives the MAC information that floods of the described new type of service of the response status that described remote station edge device feeds back according to the MAC information that floods of the described new type of service of described request state, and according to the MAC information that floods of the described new type of service of described response status, the information of record effectively the flood website corresponding with this MAC Address that floods in the described MAC address entries that floods.
By the processing of this step, the default value in (1) is replaced with to the information of the website that effectively floods provided in the MAC information that floods, thereby the information in the MAC address entries that makes to flood is supplemented and is perfect.
Situation two, the content update process after foundation floods MAC address entries.
(1) described local terminal website edge device receives described remote station edge device according to the default transmission cycle, the MAC information that floods of the response status initiatively sent.
The processing of this step is actually to be carried out on the basis that situation one completes, if foundation and information that situation one is a kind of MAC address entries that floods are improved process, so, current situation two is exactly to set up and information is improved the information updating process of the MAC address entries that floods of process for completing, such process mainly is based on the variation that service traffics that the remote station edge device configures forward configuration, or the remote station edge device upgrades needs for the active that its service traffics that configure forward configuration.
In this step, the described default transmission cycle is less than the life span of the service traffics forwarding-table item configured on described remote station edge device.
(2) described local terminal website edge device, according to entrained traffic type information in the MAC information that floods of described response status, is determined the corresponding MAC Address that floods of the MAC information that floods of described response status.
This is the information identifying of local terminal website edge device, it is to be noted, in the MAC information that floods, do not comprise the information of the concrete MAC Address that floods, and just comprise the information of type of service, and consider in situation one when the MAC address entries that floods is set up process, between the MAC Address that floods and type of service, be relation one to one, so, can be by type of service the searching of MAC Address or the MAC address entries that floods accordingly that flood.
(3) described local terminal website edge device is according to the MAC information that floods of described response status, and the information of effectively the flood website corresponding with the MAC Address that floods described response status that record in the described MAC address entries that floods is upgraded.
Owing in the MAC information that floods, having comprised effective site information that the remote station edge device initiatively sends over, so local terminal website edge device can accordingly, upgrade the corresponding list item of the MAC Address that floods found in (2).Thereby, make local terminal website edge device can know the business information that remote station edge device is the most accurately supported.
The target MAC (Media Access Control) address of step S302, the flow that receives when described local terminal website edge device is that of configuring is while flooding MAC Address, described local terminal website edge device is determined the corresponding MAC address entries that floods of this MAC Address that floods, and according to the information recorded in the MAC address entries that floods, by described traffic forwarding to the corresponding website that effectively floods of this MAC Address that floods.
In concrete application scenarios, in the information of the corresponding website that effectively floods of the described MAC Address that floods of each record in the described MAC address entries that floods, also comprise the effective outgoing interface information in the website that effectively floods, and/or the life span of the described MAC address entries that floods.
Below, for above-mentioned information, be specifically described:
Information A, effective flood effective outgoing interface information in website.
If such information spinner is in the situation that be provided with in the remote station edge device that the concrete corresponding outgoing interface of its concrete business of supporting records, if the concrete outgoing interface of the business of its certain type of supporting is not set in the remote station edge device, this information will can not be saved, and only need the information of preserving the concrete website that effectively floods to get final product.
And if be provided with such outgoing interface, so, in the process that completes above-mentioned step S302, also need such information is carried in the flow forwarded in the lump, be described as follows:
When described local terminal website edge device gives the described MAC Address that floods corresponding effectively flooding during website described traffic forwarding, the effective outgoing interface information of described local terminal website edge device carry the described website that effectively floods in the described flow forwarded in, so that described remote station edge device can be determined the forwarding interface that forwards described flow according to the effective outgoing interface information in the described website that effectively floods.
Information B, life span.
This is mainly aging for the MAC address entries that floods of realizing setting up, avoid preserving the waste of the unnecessary storage resources that floods MAC address entries and cause and the confusion that business forwards, avoid occurring that the remote station edge device has no longer continued to support the business of certain type, but MAC address entries is not aging because flood accordingly, and cause the invalid forwarding of flow.
Concrete, when the corresponding life span of the described local terminal website edge device one or more MAC address entries that flood of judgement was 0, described local terminal website edge device was deleted described one or more MAC address entries that flood.
Certainly, life span for the MAC address entries that floods, can upgrade by the situation two in above-mentioned step S301, guarantee that the life span in corresponding life span and remote station edge device is complementary, when the remote station edge device can be supported the business of certain type, all the time guarantee that corresponding list item is preserved in local terminal website edge device, and guarantee that further the flow of respective type can be transmitted to corresponding remote station edge device timely.
By above explanation, can be found out, local terminal website edge device is flood MAC address entries carry out the website of traffic forwarding of a preservation, the remote station edge device is to support the business of certain type, go forward side by side and become the website of the destination that floods of this flow, but, in concrete application scenarios, such identity location can exchange, namely in above-mentioned description process, the remote station edge device is the destination that floods of certain business of this local terminal website edge device, and local terminal website edge device is also the destination that floods of certain business of this remote station edge device simultaneously.
In such cases, in local terminal website edge device, configured the service traffics forwarding-table item of the forwarding interface of the service traffics that comprise one or more types of service, corresponding, described method also comprises three kinds of following processing procedures:
(1) answering of the flood MAC information corresponding with the situation one in above-mentioned step S301.
When described local terminal website edge device received the MAC information that floods of the type of service of carrying solicited status that the remote station edge device sends, described local terminal website edge device judged that whether the corresponding type of service of the described MAC of flooding information is complementary with the corresponding type of service of forwarding interface that this locality configures.
If judgment result is that, be, described local terminal website edge device sends the message of the MAC information that floods of the described type of service of carrying response status to described remote station edge device, so that described remote station edge device is according to the described MAC information that floods of carrying the described type of service of response status, in the MAC address entries that floods accordingly by the information of the information recording of described local terminal website edge device for the website that effectively floods, wherein, the described MAC information that floods of carrying the described type of service of response status comprises effective outgoing interface information.
(2) renewal process of the MAC information that floods of the active corresponding with the situation two in above-mentioned step S301.
When reaching default transmission during the cycle, described local terminal website edge device is according to the current forwarding interface that is in the service traffics of effective status self configured, to each remote station edge device, initiatively send respectively the MAC information that floods of response status, so that described remote station edge device upgrades the information of the website that effectively floods in the MAC address entries that floods accordingly according to the described MAC information that floods.
(3) the flow receiving course corresponding with the situation in above-mentioned step S302.
When described local terminal website edge device receives the flow that the remote station edge device forwards according to the information of the website that effectively floods recorded in the MAC address entries that floods accordingly, described local terminal website edge device obtains effective outgoing interface information of carrying in described flow, and carries out the forwarding of described flow by corresponding outgoing interface.
It should be noted that; if in local terminal website edge device, just be provided with the corresponding service traffics forwarding-table item of its type of service of supporting; the destination that floods that namely shows the flow that self is certain type of service; so; in above-mentioned (3); just do not have the processing procedure of corresponding outgoing interface, such variation can't affect protection scope of the present invention.
Below, in conjunction with concrete application scenarios, the technical scheme that the embodiment of the present invention is proposed describes.
In this application scene, the technical scheme proposed floods to certain interface of particular station as required be used to realizing EVI Network Traffic amount, as for situation about flooding to particular station as required, similarly, is not repeated.
As shown in Figure 4, the schematic flow sheet of the method that floods of the service traffics under a kind of concrete application scenarios proposed for the embodiment of the present invention, the method specifically comprises the following steps:
Step S401, the configuration service traffic forwarding, to the required MAC Address that floods of remote equipment, and is set up the MAC address entries that floods accordingly under the EVI tunnel of local terminal website edge device.
Concrete, can set up the EVI as shown in table 1 MAC address entries that floods.
The table 1EVI MAC address entries that floods
Wherein, the implication of each field is described as follows:
MAC Address floods: point out the MAC Address that floods that the forwarding service flow is required.For example, when the DHCPv6 protocol massages forwards, need to use the MAC Address 3333-0001-0002 that floods, and the VRRP protocol massages needs to use the MAC Address 0100-5e00-0012 that floods while forwarding.
VLAN: pointing out in which VLAN, to flood, can be a VLAN scope.
Service identification: sign is the service traffics of which kind of type of service.
Website effectively floods: the website that the service of corresponding type of service can be provided, by EVI-ISIS(Intermediate System to Intermediate System, Intermediate System-to-Intermediate System) notification packet study obtains, namely the system id(system banner in message) field.
Effective outgoing interface index: the physical interface index that business is provided on the website of service traffics can be provided.Namely under under this interface, hung service (as the DHCPv6 server), it is exactly the index of that interface, can obtain by the study of EVI-ISIS notification packet, need in the EVI-ISIS notification packet, increase the option(option newly in the time of realization) field, be used to carrying this information.
The Lifetime(life span): the MAC Address that floods i.e. effective life span of this MAC address entries that floods, and is also to carry this information in the newly-increased option field by the EVI-ISIS notification packet.
In above-mentioned table 1, NA means aforesaid default value, both there is no the information of the clear and definite concrete website that effectively floods, and in the process of using default value, target MAC (Media Access Control) address is the message of MAC Address of flooding if receive, acquiescence floods to all websites.
Concrete, above-mentioned newly-increased Option field, but called after EVI selective-flooding for server option(is based on the EVI of the service option that floods), and approximately be decided to be the Option100 field, concrete form is as shown in table 2:
Table 2Option100 field and explanation thereof
Wherein, it should be noted that, concrete outgoing interface information can be used above-mentioned interface index (Interface) to replace, and for example: use the corresponding interface index 0001 of g1/0/1, this is in order to save the stored bits number.
Concrete, when carrying out for the first time one while flooding the MAC Address configuration, the information of the corresponding website that effectively floods is all default value, for corresponding information is upgraded, local terminal website edge device (can carry out the setting of concrete message number according to actual needs at ensuing 3 EVI-ISIS notification packets in concrete application scenarios, such variation can't affect protection scope of the present invention) in can carry above-mentioned newly-increased Option100 field (being a kind of concrete form of above-mentioned Option field), in this Option100 field, Option Code is that Request(is aforesaid solicited status), mean to ask the remote station edge device to inform the various information of the corresponding website that effectively floods of service traffics of this type of service.
Step S402, according to concrete demand, the corresponding service traffics forwarding-table item of configuration in the remote station edge device of the business that the corresponding service type can be provided, concrete outgoing interface comprising the service guidance traffic forwarding, and this information is carried in the option100 field of EVI-ISIS notification packet, send to local terminal website edge device (for the remote station edge device of this remote station edge device).
Wherein, the service traffics forwarding-table item of setting up on the remote station edge device is specifically as shown in table 3:
Table 3 service traffics forwarding-table item
| Service identification | Outgoing interface | The lifetime(life span) |
| DHCPv6（01） | g1/0/1 | 3600s |
| VRRP（02） | g2/0/1 | 7200s |
| NTP（03） | g3/0/1 | 1800s |
| VRRP（02） | g3/0/1 | 900s |
Concrete, the announcement cycle of above-mentioned option100 field can arrange voluntarily, but must be less than corresponding lifetime value in table 2, this is to have arrived for the life span that prevents business, therefore but do not have announcement to upgrade corresponding lifetime to local terminal website edge device (for the remote station edge device of current remote station edge device), local terminal website edge device is the aging corresponding MAC address entries that floods and when lifetime makes zero.
Further, in concrete application scenarios, can in the HELLO message of the announcement of EVI-ISIS, carry above-mentioned information, namely use newly-increased Option100 field.
Step S403, local terminal website edge device, after receiving the EVI-ISIS protocol massages, check and whether carry the option100 field.
If there is no, according to concrete rule, this EVI-ISIS protocol massages is carried out to corresponding message processing.
If exist, further according to the corresponding Option100 field of wherein carrying, the MAC address entries that floods accordingly that preserve this locality is processed.
Concrete, local terminal website edge device is resolved the content in the option100 field, if the content of its Optioncode is reply(, be the aforesaid response status that is designated), by corresponding contents extraction out also, corresponding information in the MAC address entries that floods generated before upgrading.
At first, judge the Server Type(type of service in the Option100 field) the corresponding type of service of content whether in the MAC address entries that floods that preserve this locality, exist, if exist, continue to process, otherwise, abandon this message (mean that local terminal website edge device does not need to forward the flow of this type of service, the type of service of service traffics general with the MAC Address that floods be relation one to one).
In concrete application scenarios, the processing procedure that above-mentioned continuation is processed is specific as follows:
Further, judge whether the website that effectively floods of preserving in the system id that carries in the Option field and the local MAC address entries that floods of preserving is identical.
If identical, upgrade this MAC address entries that floods, corresponding outgoing interface and lifetime may upgrade, if it is not and identical, mean currently in this MAC address entries that floods not have a corresponding website, thereby, adding this website and be corresponding another of this type of service website that effectively floods, corresponding outgoing interface and lifetime also add.
Below, by different situations, the process that the above-mentioned MAC address entries that floods that the embodiment of the present invention is proposed upgrades describes in the application process under different situations:
, there is not the website that effectively floods (namely be equivalent to aforesaid initial foundation flood the situation of MAC address entries) in situation one in the former MAC address entries that floods.
If local terminal website edge device is received the message that carries Option100 field as follows, and system id=1 in the EVI-ISIS message:
| Option type (100) | 0x0064 |
| Option?code | 0x01 |
| Option?length | Option, 2 byte 0x0008 |
| Server?type | 0x0001 |
| interface | 0x0001 |
| Lifetime | 0x00000708, i.e. 1800s |
Mean that this Option100 field is response status, and, in Server type, 0x0001 means the type of service of DHCPv6, this type of service exists in the current local MAC address entries that floods of preserving, and in this MAC address entries that floods, do not store the information of the website that effectively floods accordingly, so, local terminal website edge device is according to the information of above-mentioned Option100 field, the original MAC address entries that floods as follows that this locality is preserved:
Be updated to the new MAC address entries that floods as follows.
In situation two, the former MAC address entries that floods, there is the website that effectively floods (namely be equivalent to the aforesaid MAC address entries that floods set up and filled default value after, the situation of carrying out information updating).
If local terminal website edge device is received the message that carries Option100 field as follows, and system id=1 in the EVI-ISIS message:
| Option type (100) | 0x0064 |
| Option?code | 0x01 |
| Option?length | Option, 2 byte 0x0008 |
| Server?type | 0x0001 |
| interface | 0x0002 |
| Lifetime | 0x00000E10, i.e. 3600s |
Mean that this Option100 field is response status, and, in Server type, 0x0001 means the type of service of DHCPv6, this type of service exists in the current local MAC address entries that floods of preserving, and in this MAC address entries that floods and the information of having stored the website that effectively floods, through comparison, can find, the website that effectively floods accordingly is consistent, and effectively the outgoing interface index is also inconsistent, so, local terminal website edge device need to be the information of this new website that effectively floods of MAC Address interpolation that floods, so, information according to above-mentioned Option100 field, the original MAC address entries that floods as follows by this locality preservation:
Be updated to the new MAC address entries that floods as follows.
Situation three, the website that effectively floods in the system id carried in the EVI-ISIS message and MAC table is not identical, illustrates that this Option100 field is from another website, therefore, needs to add the new MAC address entries that floods
Local terminal website edge device is received the message that carries Option100 field as follows, and system id=2 in the EVI-ISIS message:
| Option type (100) | 0x0064 |
| Option?code | 0x01 |
| Option?length | Option, 2 byte 0x0008 |
| Server?type | 0x0001 |
| interface | 0x0002 |
| Lifetime | 0x00000E10, i.e. 3600s |
Mean that this Option100 field is response status, and, in Server type, 0x0001 means the type of service of DHCPv6, this type of service exists in the current local MAC address entries that floods of preserving, but the website that effectively floods accordingly is the website of system ID=1, different from the corresponding website of Option100, therefore, in this floods MAC address entries, do not store the information of the corresponding website that effectively floods of this Option100, so, local terminal website edge device is according to the information of above-mentioned Option100 field, the original MAC address entries that floods as follows by this locality preservation:
Be updated to the new MAC address entries that floods as follows.
Step S404, when local terminal website edge device, to receive target MAC (Media Access Control) address be the flow of the local MAC Address that floods of preserving, and according to flooding MAC address entries, this flow is flooded to corresponding remote station edge device.
In conjunction with aforesaid contents in table, say, the following MAC address entries that floods means, local terminal website edge device is received when target MAC (Media Access Control) address is the DHCPv6 service traffics of 3333-0001-0002, the interface direction that is 0001 to the outgoing interface index of remote station edge device 1 floods, after remote station edge device 1 equipment is received this message, and after carrying out the tunnel decapsulation, according to interface index 0001 by this message repeating to the g1/0/1 interface.
It is to be noted, in order clearly to identify the information of interface, local terminal website edge device adds an Interface id option in the message that the EVI tunnel forwards, mark need to be forwarded to the outgoing interface of remote station edge device, and the remote station edge device is received this message, and after carrying out the tunnel decapsulation, can resolve and obtain the outgoing interface index, thereby, directly find corresponding outgoing interface, the message repeating after decapsulation is gone out.
| Option type (18) | 0x0012 |
| Option?length | 0x02 |
| Interface | 0x0001 |
In the technical scheme that the embodiment of the present invention proposes, the effect of lifetime is mainly in order the MAC address entries that floods to be carried out aging and to upgrade.This is in order to adapt to more flexibly in website and the migration of server between website.
Below, by concrete example, corresponding application process is described:
Situation one:
Other interface g1/0/2 that the DHCPv6 server of hanging under the g1/0/1 interface on remote station edge device 1 is migrated to, service traffics just needn't mail to g1/0/1 again, now, need to be the flood MAC address entries aging deletion corresponding with g1/0/1 of preserving on local terminal website edge device.Concrete process is as follows:
Owing on remote station edge device 1, having no longer included the corresponding service traffics forwarding-table item of g1/0/1, (can being initiatively to delete when generation server moves, can be also that lifetime along with corresponding service traffics forwarding-table item makes zero and deleted), therefore, remote station edge device 1 can initiatively not send corresponding to the Option100 field of g1/0/1 yet the information that local device floods in MAC address entries is accordingly upgraded, so, lifetime corresponding with g1/0/1 in the MAC address entries that floods that local terminal website edge device is preserved also can slowly make zero, local terminal website edge device also can be after it makes zero, the MAC address entries that floods is accordingly deleted.
Can illustrate with following example:
Because local terminal website edge device receives corresponding to effective outgoing interface index 0001(, do not mean interface g1/0/1) new Option100 field, therefore, lifetime can not upgrade, and only can slowly make zero, specific as follows shown in:
And after lifetime was kept to 0, this list item was just deleted by local terminal website edge device, the MAC address entries that floods accordingly upgrades as follows, to the corresponding MAC address entries that floods of g1/0/1, has carried out aging.
Situation two:
The website 2 interface g1/0/1 that the DHCPv6 server of hanging under the g1/0/1 interface on remote station edge device 1 is migrated to, service traffics just needn't mail to the g1/0/1 of website 1 again, now, need to be the corresponding aging deletion of the MAC address entries that floods of the g1/0/1 with remote station edge device 1 preserved on local terminal website edge device.Concrete process is as follows:
Owing on remote station edge device 1, having no longer included the corresponding service traffics forwarding-table item of DHCPv6 business, (can being initiatively to delete when generation server moves, can be also that lifetime along with corresponding service traffics forwarding-table item makes zero and deleted), therefore, remote station edge device 1 can initiatively not send corresponding to the Option100 field of DHCPv6 business yet the information that local device floods in MAC address entries is accordingly upgraded, so, lifetime corresponding with remote station edge device 1 in the MAC address entries that floods that local terminal website edge device is preserved also can slowly make zero, local terminal website edge device also can be after it makes zero, the MAC address entries that floods is accordingly deleted.
Can illustrate with following example:
Because local terminal website edge device receives corresponding to the website 1(that effectively floods, do not mean remote station edge device 1) new Option100 field, therefore, lifetime can not upgrade, and only can slowly make zero, specific as follows shown in:
And after lifetime was kept to 0, this list item was just deleted by local terminal website edge device, the MAC address entries that floods accordingly upgrades as follows, to the corresponding MAC address entries that floods of remote station edge device 1, has carried out aging.
As can be seen here, when local terminal website edge device was never received the Option100 that upgrades the corresponding MAC address entries that floods, lifetime can slowly make zero, and local terminal website edge device also can be crossed after date at lifetime, and the MAC address entries that floods of correspondence is deleted.
Further, in concrete application scenarios, in order to realize reminding better effect, after can approximately fixing on lifetime and reducing to half the time, if now there is EVI-ISIS HELLO message to send, initiatively carry the option100 field, option code is request (being designated solicited status), corresponding lifetime value is upgraded in request, in official hour, if do not receive and reply, local terminal website edge device can be deleted the MAC address entries that floods of correspondence immediately, can reduce like this, again the unnecessary of flow floods.
Compared with prior art, the technical scheme that proposes of the embodiment of the present invention has the following advantages:
The technical scheme proposed by applying the embodiment of the present invention, the MAC configuration that floods based on local terminal website edge device, the service traffics that guarantee local terminal website edge device only can be forwarded to specific effective website, independence between each website strengthens, ensured the fail safe of data communication, possibility under fire will reduce greatly, thereby, having solved EVI Network Traffic amount floods between each website and in website, by actual business demand, flood, only have the website that effective business service can be provided just to allow to flood, unnecessary flooding traffic and bandwidth loss have been reduced, guarantee the proper communication of each website.
In order to realize technical scheme of the present invention, the invention allows for a kind of route exchange device, as site apparatus, be applied in the EVI network system, shown in its structural representation Fig. 5, comprising:
Configuration module 51, service traffics for configuration various types of traffic under the EVI tunnel of described route exchange device are forwarded to the required MAC Address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods, wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods;
Receiver module 52, the flow sent be used to receiving other network equipments or route exchange device;
Determination module 53, be of configuring of described configuration module 51 while flooding MAC Address for the target MAC (Media Access Control) address of the flow that receives at described receiver module 52, determines the corresponding MAC address entries that floods of the described MAC Address that floods;
Forwarding module 54, for the information recorded according to the determined MAC address entries that floods of described determination module 53, by described traffic forwarding to the corresponding website that effectively floods of this MAC Address that floods.
Further, above-mentioned route exchange device also comprises sending module 55 and update module 56, and corresponding to the situation one in aforesaid step S301, corresponding processing module also comprises following functions:
Described configuration module 51, also for the service traffics of a kind of new type of service of configuration under the EVI tunnel when at described route exchange device, be forwarded to required the flooding during MAC Address of remote equipment, set up the flood MAC address entries corresponding with this MAC Address that floods, the initial value of the information of the website that effectively floods that this MAC Address that floods recorded in the MAC address entries that floods of wherein, setting up is corresponding is default value;
Described sending module 55, after for the service traffics that configured a kind of new type of service at described configuration module 51, being forwarded to the required MAC Address that floods of remote equipment, in the one or more message that send to the remote station edge device, carry the MAC information that floods of the described new type of service of solicited status, ask the information of effectively the flood website corresponding with this MAC Address that floods;
Described receiver module 52, the MAC information that floods of the described new type of service of the response status also fed back be used to the MAC information that floods of the described new type of service that receives the solicited status that described remote station edge device sends according to described sending module 55;
Described update module 56, for the MAC information that floods of the described new type of service according to the received described response status of described receiver module 52, in the MAC address entries that floods that described configuration module 51 is set up, record the information of effectively the flood website corresponding with this MAC Address that floods.
Corresponding to the situation two in aforesaid step S301, corresponding processing module also comprises following functions:
Described receiver module 52, also be used to receiving described remote station edge device according to the default transmission cycle, the MAC information that floods of the response status initiatively sent, wherein, the described default transmission cycle is less than the life span of the service traffics forwarding-table item configured on described remote station edge device;
Described update module 56, also for the entrained traffic type information of the MAC information that floods according to the received response status of described receiver module 52, determine the corresponding MAC Address that floods of the MAC information that floods of described response status, and according to the MAC information that floods of described response status, in the MAC address entries that floods that described configuration module 51 is configured, the information of effectively the flood website corresponding with the MAC Address that floods described response status that record is upgraded.
Further, in the information of the corresponding website that effectively floods of the described MAC Address that floods of each record in the MAC address entries that floods that described configuration module 51 configures, also comprise the effective outgoing interface information in the website that effectively floods, and/or the life span of the described MAC address entries that floods, wherein:
Described forwarding module 54, also for when described traffic forwarding being given the described MAC Address that floods corresponding effectively flooding during website, effective outgoing interface information carry the described website that effectively floods in the described flow forwarded in, so that described remote station edge device can be determined the forwarding interface that forwards described flow according to the effective outgoing interface information in the described website that effectively floods; And/or,
Described update module 56, also, for when the corresponding life span of the one or more MAC address entries that flood of judgement is 0, delete one or more MAC address entries that flood that described configuration module 51 configures.
Preferably, described configuration module 51, also be used to the service traffics forwarding-table item of the forwarding interface that configures the local service traffics that comprise one or more types of service, corresponding:
Described sending module 55, also when at described receiver module 52, receiving the MAC information that floods of the type of service of carrying solicited status that the remote station edge device sends, judge that whether the corresponding type of service of the described MAC of flooding information is complementary with the corresponding type of service of forwarding interface that this locality configures, if judgment result is that, be, to described remote station edge device, send the message of the MAC information that floods of the described type of service of carrying response status, so that described remote station edge device is according to the described MAC information that floods of carrying the described type of service of response status, in the MAC address entries that floods accordingly by the information of the information recording of described local terminal website edge device for the website that effectively floods, wherein, the described MAC information that floods of carrying the described type of service of response status comprises effective outgoing interface information,
Described sending module 55, also for when reaching default transmission during the cycle, the current forwarding interface that is in the service traffics of effective status configured according to described configuration module 51, to each remote station edge device, initiatively send respectively the MAC information that floods of response status, so that described remote station edge device is according to the described MAC information that floods, in the MAC address entries that floods accordingly, the information of the website that effectively floods is upgraded, wherein, the described default transmission cycle is less than the life span of the service traffics forwarding-table item that described configuration module 51 configures;
Described forwarding module 54, during the flow that also forwards for the information that receives the website that effectively floods that the remote station edge device records according to the MAC address entries that floods accordingly when described receiver module 52, obtain effective outgoing interface information of carrying in described flow, and carry out the forwarding of described flow by corresponding outgoing interface.
Compared with prior art, technical scheme proposed by the invention has the following advantages:
The technical scheme proposed by applying the embodiment of the present invention, the MAC configuration that floods based on local terminal website edge device, the service traffics that guarantee local terminal website edge device only can be forwarded to specific effective website, independence between each website strengthens, ensured the fail safe of data communication, possibility under fire will reduce greatly, thereby, having solved EVI Network Traffic amount floods between each website and in website, by actual business demand, flood, only have the website that effective business service can be provided just to allow to flood, unnecessary flooding traffic and bandwidth loss have been reduced, guarantee the proper communication of each website.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by hardware, also can realize by the mode that software adds necessary general hardware platform.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions with so that computer equipment (can be personal computer, server, or the network equipment etc.) each implements the described method of scene to carry out the present invention.
It will be appreciated by those skilled in the art that accompanying drawing is a schematic diagram of preferably implementing scene, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device of implementing in scene can be distributed in the device of implementing scene according to implementing scene description, also can carry out respective change and be arranged in the one or more devices that are different from this enforcement scene.The module of above-mentioned enforcement scene can be merged into a module, also can further split into a plurality of submodules.
The invention described above sequence number, just to describing, does not represent the quality of implementing scene.
Above disclosed be only several concrete enforcement scene of the present invention, still, the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. the method that floods of service traffics, be applied to, in the virtual interconnected EVI network system of Ethernet, it is characterized in that, described method comprises the following steps at least:
Local terminal website edge device configures various types of traffic under the EVI tunnel of self service traffics are forwarded to the required media access control MAC address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods, wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods;
The target MAC (Media Access Control) address of the flow received when described local terminal website edge device is that of configuring is while flooding MAC Address, described local terminal website edge device is determined the corresponding MAC address entries that floods of this MAC Address that floods, and according to the information recorded in the MAC address entries that floods, by described traffic forwarding to the corresponding website that effectively floods of this MAC Address that floods.
2. the method for claim 1, it is characterized in that, described local terminal website edge device configures various types of traffic under the EVI tunnel of self service traffics are forwarded to the required MAC Address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods, wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods, specifically comprise:
When the service traffics of a kind of new type of service of configuration under the EVI tunnel of described local terminal website edge device at self are forwarded to required the flooding during MAC Address of remote equipment, described local device is set up the flood MAC address entries corresponding with this MAC Address that floods, the initial value of the information of the website that effectively floods that this MAC Address that floods recorded in the MAC address entries that floods of wherein, setting up is corresponding is default value;
Described local terminal website edge device carries the MAC information that floods of the described new type of service of solicited status in the one or more message that send to the remote station edge device, ask the information of effectively the flood website corresponding with this MAC Address that floods;
Described local terminal website edge device receives the MAC information that floods of the described new type of service of the response status that described remote station edge device feeds back according to the MAC information that floods of the described new type of service of described request state, and according to the MAC information that floods of the described new type of service of described response status, the information of record effectively the flood website corresponding with this MAC Address that floods in the described MAC address entries that floods.
3. method as claimed in claim 2, it is characterized in that, described local terminal website edge device configures various types of traffic under the EVI tunnel of self service traffics are forwarded to the required MAC Address that respectively floods of remote equipment, and, after the foundation MAC address entries that floods corresponding with the described MAC Address that respectively floods, also comprise:
Described local terminal website edge device receives described remote station edge device according to the default transmission cycle, the MAC information that floods of the response status initiatively sent, wherein, the described default transmission cycle is less than the life span of the service traffics forwarding-table item configured on described remote station edge device;
Described local terminal website edge device, according to entrained traffic type information in the MAC information that floods of described response status, is determined the corresponding MAC Address that floods of the MAC information that floods of described response status;
Described local terminal website edge device is according to the MAC information that floods of described response status, and the information of effectively the flood website corresponding with the MAC Address that floods described response status that record in the described MAC address entries that floods is upgraded.
4. the method described in any one in claims 1 to 3, it is characterized in that, in the information of the corresponding website that effectively floods of the MAC Address that respectively floods recorded in the described MAC address entries that floods, also comprise the effective outgoing interface information in the website that effectively floods, and/or the life span of the described MAC address entries that floods, wherein:
When described local terminal website edge device gives the described MAC Address that floods corresponding effectively flooding during website described traffic forwarding, the effective outgoing interface information of described local terminal website edge device carry the described website that effectively floods in the described flow forwarded in, so that described remote station edge device can be determined the forwarding interface that forwards described flow according to the effective outgoing interface information in the described website that effectively floods; And/or,
When the corresponding life span of the described local terminal website edge device one or more MAC address entries that flood of judgement was 0, described local terminal website edge device was deleted described one or more MAC address entries that flood.
5. the method for claim 1, is characterized in that, when the service traffics forwarding-table item of the forwarding interface that has configured the service traffics that comprise one or more types of service in described local terminal website edge device, described method also comprises:
When described local terminal website edge device receives the MAC information that floods of the type of service of carrying solicited status that the remote station edge device sends, described local terminal website edge device judges that whether the corresponding type of service of the described MAC of flooding information is complementary with the corresponding type of service of forwarding interface that this locality configures, if judgment result is that, be, described local terminal website edge device sends the message of the MAC information that floods of the described type of service of carrying response status to described remote station edge device, so that described remote station edge device is according to the described MAC information that floods of carrying the described type of service of response status, in the MAC address entries that floods accordingly by the information of the information recording of described local terminal website edge device for the website that effectively floods, wherein, the described MAC information that floods of carrying the described type of service of response status comprises effective outgoing interface information,
When reaching default transmission during the cycle, described local terminal website edge device is according to the current forwarding interface that is in the service traffics of effective status self configured, to each remote station edge device, initiatively send respectively the MAC information that floods of response status, so that described remote station edge device upgrades the information of the website that effectively floods in the MAC address entries that floods accordingly according to the described MAC information that floods;
When described local terminal website edge device receives the flow that the remote station edge device forwards according to the information of the website that effectively floods recorded in the MAC address entries that floods accordingly, described local terminal website edge device obtains effective outgoing interface information of carrying in described flow, and carries out the forwarding of described flow by corresponding outgoing interface.
6. a route exchange device, be applied to, in the virtual interconnected EVI network system of Ethernet, it is characterized in that as the website edge device, comprises at least:
Configuration module, service traffics for configuration various types of traffic under the EVI tunnel of described route exchange device are forwarded to the required MAC Address that respectively floods of remote equipment, and foundation the flood MAC address entries corresponding with the described MAC Address that respectively floods, wherein, in the described MAC address entries that floods, record the information of the corresponding website that effectively floods of each described MAC Address that floods;
Receiver module, the flow sent be used to receiving other network equipments or route exchange device;
Determination module, be of configuring of described configuration module while flooding MAC Address for the target MAC (Media Access Control) address of the flow that receives at described receiver module, determines the corresponding MAC address entries that floods of this MAC Address that floods;
Forwarding module, for the information recorded according to the determined MAC address entries that floods of described determination module, by described traffic forwarding to the corresponding website that effectively floods of this MAC Address that floods.
7. route exchange device as claimed in claim 6, is characterized in that, also comprises sending module and update module, wherein:
Described configuration module, also for the service traffics of a kind of new type of service of configuration under the EVI tunnel when at described route exchange device, be forwarded to required the flooding during MAC Address of remote equipment, set up the flood MAC address entries corresponding with this MAC Address that floods, the initial value of the information of the website that effectively floods that this MAC Address that floods recorded in the MAC address entries that floods of wherein, setting up is corresponding is default value;
Described sending module, after for the service traffics that configured a kind of new type of service at described configuration module, being forwarded to the required MAC Address that floods of remote equipment, in the one or more message that send to the remote station edge device, carry the MAC information that floods of the described new type of service of solicited status, ask the information of effectively the flood website corresponding with this MAC Address that floods;
Described receiver module, the MAC information that floods of the described new type of service of the response status also fed back be used to the MAC information that floods of the described new type of service that receives the solicited status that described remote station edge device sends according to described sending module;
Described update module, for the MAC information that floods of the described new type of service according to the received described response status of described receiver module, in the MAC address entries that floods that described configuration module is set up, record the information of effectively the flood website corresponding with this MAC Address that floods.
8. route exchange device as claimed in claim 7, is characterized in that,
Described receiver module, also be used to receiving described remote station edge device according to the default transmission cycle, the MAC information that floods of the response status initiatively sent, wherein, the described default transmission cycle is less than the life span of the service traffics forwarding-table item configured on described remote station edge device;
Described update module, also for the entrained traffic type information of the MAC information that floods according to the received response status of described receiver module, determine the corresponding MAC Address that floods of the MAC information that floods of described response status, and according to the MAC information that floods of described response status, in the MAC address entries that floods that described configuration module is configured, the information of effectively the flood website corresponding with the MAC Address that floods described response status that record is upgraded.
9. the route exchange device described in any one in claim 6 to 8, it is characterized in that, in the information of the corresponding website that effectively floods of the MAC Address that respectively floods recorded in the MAC address entries that floods that described configuration module configures, also comprise the effective outgoing interface information in the website that effectively floods, and/or the life span of the described MAC address entries that floods, wherein:
Described forwarding module, also for when described traffic forwarding being given the described MAC Address that floods corresponding effectively flooding during website, effective outgoing interface information carry the described website that effectively floods in the described flow forwarded in, so that described remote station edge device can be determined the forwarding interface that forwards described flow according to the effective outgoing interface information in the described website that effectively floods; And/or,
Described update module, also, for when the corresponding life span of the one or more MAC address entries that flood of judgement is 0, delete one or more MAC address entries that flood that described configuration module configures.
10. route exchange device as claimed in claim 6, is characterized in that, described configuration module also comprises the service traffics forwarding-table item of forwarding interface of the service traffics of one or more types of service for configuration, corresponding:
Described sending module, also when at described receiver module, receiving the MAC information that floods of the type of service of carrying solicited status that the remote station edge device sends, judge that whether the corresponding type of service of the described MAC of flooding information is complementary with the corresponding type of service of forwarding interface that this locality configures, if judgment result is that, be, to described remote station edge device, send the message of the MAC information that floods of the described type of service of carrying response status, so that described remote station edge device is according to the described MAC information that floods of carrying the described type of service of response status, in the MAC address entries that floods accordingly by the information of the information recording of described local terminal website edge device for the website that effectively floods, wherein, the described MAC information that floods of carrying the described type of service of response status comprises effective outgoing interface information,
Described sending module, also for when reaching default transmission during the cycle, the current forwarding interface that is in the service traffics of effective status configured according to described configuration module, to each remote station edge device, initiatively send respectively the MAC information that floods of response status, so that described remote station edge device is according to the described MAC information that floods, in the MAC address entries that floods accordingly, the information of the website that effectively floods is upgraded, wherein, the described default transmission cycle is less than the life span of the service traffics forwarding-table item that described configuration module configures;
Described forwarding module, during the flow that also forwards for the information that receives the website that effectively floods that the remote station edge device records according to the MAC address entries that floods accordingly when described receiver module, obtain effective outgoing interface information of carrying in described flow, and carry out the forwarding of described flow by corresponding outgoing interface.
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