CN106789748A - A kind of distributed couple in multiplexer DAM stacking network system and its apparatus - Google Patents
A kind of distributed couple in multiplexer DAM stacking network system and its apparatus Download PDFInfo
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- CN106789748A CN106789748A CN201510817037.8A CN201510817037A CN106789748A CN 106789748 A CN106789748 A CN 106789748A CN 201510817037 A CN201510817037 A CN 201510817037A CN 106789748 A CN106789748 A CN 106789748A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
- H04L49/1515—Non-blocking multistage, e.g. Clos
- H04L49/1523—Parallel switch fabric planes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/15—Interconnection of switching modules
- H04L49/1507—Distribute and route fabrics, e.g. sorting-routing or Batcher-Banyan
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/35—Switches specially adapted for specific applications
- H04L49/354—Switches specially adapted for specific applications for supporting virtual local area networks [VLAN]
Abstract
The invention provides network entity automatic discovering method and device in a kind of distributed DAM, routing iinformation is exchanged by BGP message between network entity, BGP message can be used UPDATE message, it includes multiple attributes to support to exchange routing iinformation between network entity, mapping table between generation virtual network example and corresponding network virtualization tunnel is simultaneously superimposed tunnel according to what the table was set up between network entity, and UPDATE message can be included：MP_REACH_NLRI attributes, for issuing up to the virtual network Context identifier under one virtual network example of the purpose network information and corresponding next hop information and transmission；Two-layer VPN identifies extended community attribute, for identifying a specific virtual network example in DAM systems；BGP encapsulates extended community attribute, to indicate the tunnel type of tunnel encapsulation.The present invention can support disposing AM access module and the virtualization of center module realization near the position of user, propose to find that signaling mechanism can coexist with existing L2VPN/VPLS signalings automatically, improve the sustainability of equipment.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of distributed couple in multiplexer DAM stacking networks
System and its apparatus.
Background technology
DAM (couple in multiplexers of future generation：Distributed Access Multiplexer) trend be
More distributed framework is supported, more multi-functional virtualization is supported, Fig. 1 shows the portion of distributed DAM
Administration's model, wherein mainly including 4 generic modules：ERM modules (edge router module), it runs IP/MPLS
Data plane functions；CPM modules (control plane module), it runs control plane and management plane function；
SPM (service plane module), it runs business and application function；RAM module RAM1, RAM2, RAM3
(remote access module), it is closing on the place various special Access Layer technologies of termination of client, for example：
Cable access technology based on DOCSIS (data over cable service interface specification), (ether is passive for EPON
Optical-fiber network) and GPON (gigabit passive optical network) soft exchange technology or all kinds digital subscriber
The access technology of line xDSL, RAM module is presented unified ether interface to network side, is passed by bottom
A stacking network (Overlay is built on defeated network (usually Ethernet or IP network)
Network), all distributed modules can be mutually unified into an integral device, the part of module shown in Fig. 1
A standard server or the software run on data center's virtual machine can virtually be turned to.
One subject matter of DAM is how to be set up and be safeguarded for interconnecting distribution in expansible mode
Automatic discovery between the network entity of the stacking network of module, especially DAM, the function of the stacking network
Equivalent to " backboard " of this distributed apparatus.Existing IETF (Internet engineering task force)
L2VPN/VPLS (two virtual private network services of layer/VPLS) signaling protocol, due to it
MPLS-in-MPLS or MPLS-in-IP tunnel types are only supported in design, other main flows can not be supported
NVO3 (based on three layers of network virtualization) tunnel type, is that cannot function as in the case where not doing and extending
The automatic discovery of DAM stacking networks and signaling mechanism.
The content of the invention
The present invention is intended to provide one kind is built and is safeguarded distributed couple in multiplexer based on IETF NVO3 frameworks
DAM stacking networks；Propose a kind of automatic discovery extended based on Border Gateway Protocol (BGP) and letter simultaneously
Mechanism is made, all endpoint of a tunnel IP address of DAM stacking networks is found for automatic, and transmit relevant tunnel
Road encapsulated type parameter and virtual network Context identifier.
According to an aspect of the present invention, network in a kind of distributed couple in multiplexer DAM systems is provided here
Entity automatic discovering method, by Border Gateway Protocol (BGP) message exchange routing iinformation between network entity,
The Border Gateway Protocol (BGP) message is UPDATE message, and it is included with properties：MP_REACH_NLRI
Attribute, two-layer VPN mark extended community attribute, BGP encapsulation extended community attribute, route target extension group
Body attribute, wherein：MP_REACH_NLRI attributes, for issuing up to the purpose network information and accordingly
Next hop information, and transmit the virtual network Context identifier under a virtual network example；Two-layer VPN
Mark extended community attribute, for identifying a specific virtual network example in DAM systems；BGP is encapsulated
Extended community attribute, the tunnel type for indicating stacking network tunnel encapsulation；Route target extended community belongs to
Property, the topological structure for controlling stacking network tunnel.
Preferably, foregoing MP_REACH_NLRI attributes include：Length field, it is described for defining
The length of MP_REACH_NLRI attributes；Virtual network Context identifier domain, for representing correspondence particular tunnel
The virtual network Context identifier of a virtual network example under type.
Preferably, the tunnel type is virtual expansible LAN VXLAN, the virtual network context mark
Know and represent virtual expansible local net network mark；Or the tunnel type is to use the net of generic route encapsulation
Network virtualizes NVGRE, and the virtual network Context identifier is represented and uses the network virtual of generic route encapsulation
Change NVGRE virtual subnets mark；Or the tunnel type is to be handed over using the multiprotocol label of generic route encapsulation
MPLS-in-GRE is changed, the virtual network Context identifier exists comprising the functional entity for sending UPDATE message
The multiprotocol label switching service label being locally-assigned.
According to another aspect of the present invention, during a kind of distributed couple in multiplexer DAM systems are provided here
Network entity, it includes：Network virtualization edge device, by Border Gateway Protocol (BGP) message in DAM
Grid exchanged between entities routing iinformation, and virtual network example is accordingly generated with corresponding network virtualization
Mapping table between tunnel and the stacking network tunnel set up between network entity according to the mapping table；Wherein,
The mapping table at least includes：A specific virtual network example in mark DAM systems, correspondent network reality
The IP address of body, the virtual network Context identifier under a virtual network example sets up network tunnel encapsulation
Tunnel type.
Preferably, foregoing boundary gateway protocol BGP message is UPDATE message, and it is included with properties：
MP_REACH_NLRI attributes, two-layer VPN mark extended community attribute, BGP encapsulation extended community attribute, road
By target extended community attribute, wherein：MP_REACH_NLRI attributes, for issuing up to purpose network letter
Breath and corresponding next hop information, and transmit the virtual network context mark under a virtual network example VNI
Know；Two-layer VPN identifies extended community attribute, for identifying a specific virtual network reality in DAM systems
Example；BGP encapsulates extended community attribute, the tunnel type for indicating stacking network tunnel encapsulation；Route mesh
Mark extended community attribute, the topological structure for controlling stacking network tunnel.
Preferably, the tunnel type is virtual expansible LAN VXLAN, the virtual network context mark
Know and represent virtual expansible LAN VXLAN network identities；Or the tunnel type is to be sealed using general route
The network virtualization NVGRE of dress, the virtual network Context identifier is represented and uses the net of generic route encapsulation
Network virtualization NVGRE virtual subnet marks；Or the tunnel type is to use the multi-protocols of generic route encapsulation
Tag switching MPLS-in-GRE, the virtual network Context identifier includes the function of sending UPDATE message
Entity is in the multiprotocol label switching MPLS service labels being locally-assigned.
Preferably, aforementioned network entity also includes：The layer transponder of two/layer three, realizes being based on two layers or three layers
Data forwarding；The network virtualization edge device will be forwarded according to the mapping table from two/layer of layer three
The data of device are encapsulated with specified type, corresponding far-end network entity are sent to by stacking network tunnel, or will
After network tunnel data decapsulation from far-end network entity, it is sent to the transponder of two/layer of local layer three.
According to another aspect of the present invention, a kind of distributed couple in multiplexer DAM overlay networks are provided here
Network system, its foregoing network entity.
The method and its device for being provided according to embodiments of the present invention, it is supported near the deployment of the position of user
The AM access module of existing physical circuit is best suitable for, the virtualization of Support center module is realized；The present invention is carried simultaneously
Go out new automatic discovery and signaling mechanism, can be coexisted with existing L2VPN/VPLS signalings, greatly lifted
Develop the sustainability of these equipment.
Brief description of the drawings
By the detailed description with the accompanying drawing being set forth below, feature of the invention, property and advantage will become
More obvious, there is identical element identical to identify in accompanying drawing, wherein：
Fig. 1 is the deployment model of conventional distributed couple in multiplexer；
Fig. 2 is the distributed couple in multiplexer DAM overlapping systems and Border Gateway Protocol that the present invention is provided
The scene of BGP signaling message communications；
Fig. 3 is the Border Gateway Protocol (BGP) message NLRI code field forms that the present invention is provided；
Fig. 4 is the distributed couple in multiplexer DAM device model Pictorial examples that the present invention is provided；
Fig. 5 is that the virtual network example of the couple in multiplexer DAM generations that the present invention is provided is empty with corresponding network
Mapping table schematic diagram between planization tunnel；
Fig. 6 is between the L2/L3 transponders and virtual network example of the couple in multiplexer DAM that the present invention is provided
Relation schematic diagram.
Specific embodiment
In the specific descriptions of following preferred embodiment, will be attached with reference to appended by constituting a present invention part
Figure.Appended accompanying drawing has been illustrated by way of example can realize specific embodiment.Example
Embodiment be not intended as limit all embodiments of the invention.
Following examples are carried out using the framework and term of IETF NVO3 to distributed couple in multiplexer DAM
Illustrate, illustrated as a example by considering the L2 business based on NVO3 frameworks.
Fig. 2 is the field of the distributed DAM Internal BGP BGP signaling message communications that the present invention is provided
Scape is IETF NVO3 frameworks in legend to be built and safeguards the network virtualization superposition inside distribution DAM
Network.Generally, IETF NVO3 frameworks are answering for data center network virtualization in design starting point
With environment, it has huge autgmentability, can be provided in the environment of data center virtual two layers (L2) or
Three layers of (L3) business, are interconnected with the L2 between the virtual machine for supporting data center or L3.IETF NVO3
Can support various tunnel encapsulation functions on datum plane, such as VXLAN (virtual expansible LAN),
NVGRE (uses the network virtualization of generic route encapsulation), or MPLS-in-GRE (uses general route envelope
The multiprotocol label switching of dress) etc..On the control plane, NVO3 is using centralized Network
Virtualization Authority functional entitys come do IP address registration and distribute.This mode is very
It is suitable to data center network virtualization applications scene, but it is virtual to be suitable to distributed DAM internal networks
Change the application scenarios of stacking network.
In the present embodiment, each DAM module in distributed DAM, including ERM modules, CPM modules,
SPM modules and RAM module are required for operation MP-BGP agreements (hereinafter referred to as bgp protocol) as signaling
Agreement.
According to a kind of embodiment provided by the present invention, found automatically and signaling mechanism for distributed DAM,
We define a new BGP UPDATE message form based on bgp protocol, for ease of narration, the application
Further part is by for distributed DAM, discovery and the BGP Update message of signaling protocol are referred to as automatically
BGP-DAM message, the BGP-DAM message is used to exchange routing iinformation between distributed DAM modules, and it was both
Can issue up to routing iinformation, it is also possible to unreachable routing iinformation is cancelled, by new automatic discovery and letter
Mechanism is made, the network entity in distributed DAM can be obtained -- endpoint of a tunnel, i.e., the system of each DAM modules
IP address, and NVO3 tunnel types parameter and virtual network Context identifier are transmitted by the signaling protocol,
So as to be set up in each DAM modules between virtual network example VNI and corresponding network virtualization tunnel
Mapping table.
In legend, to ensure the connectedness between each DAM module, it is necessary to be built between each DAM module
Found full annexation, it is assumed that there are n platform DAM modules inside an AS, then the BGP connections that should be set up
Number is just n (n-1)/2.When DAM number of modules is a lot, to the consumption of Internet resources and cpu resource all very
Greatly.Bgp router reflector can solve this problem in legend, in an AS, use wherein one road
By device as Router Reflector (Route Reflector), DAM modules are used as client computer and Router Reflector
Between set up BGP connection.Bgp router reflector transmits (reflection) routing iinformation between DAM modules,
And BGP connections need not be set up between DAM modules.Router Reflector and DAM modules constitute a cluster.
In some cases, in order to increase the reliability of network and prevent Single Point of Faliure, can be configured in a cluster
More than one Router Reflector.At this moment, each Router Reflector in same cluster will configure phase
Same cluster identity Cluster_ID, to avoid route from circulating.
Fig. 2 further illustrates the Border Gateway Protocol found automatically for distributed DAM with signaling mechanism
BGP Update message encoding formats, new BGP UPDATE messages need to include with properties：
MP_REACH_NLRI attributes；Two-layer VPN mark extended community attribute (the VPN Identifier of Layer 2
extended community)；BGP encapsulation extended community attributes (BGP Encapsulation extended
community)；Route target extended community attribute (Route Target extended community).
Wherein, MP_REACH_NLRI attributes
MP_REACH_NLRI attributes are used to issue up to the purpose network information and corresponding next hop information,
Can use with identical AFI (Address-Family Identifier) values in BGP-AD, BGP-VPLS and BGP-MH agreement and
SAFI (subsequent address race mark) value, i.e. AFI=25, represents L2VPN；SAFI=65, represents VPLS.
NEXT_HOP fields should be set to send the system ip address of PE (i.e. DAM modules).(Internet can for NLRI
Up to property information) coded format of field is that the present embodiment is newly defined, it supports to find and transmit automatically simultaneously
Virtual network Context identifier.
The coded format of the NLRI fields that the present embodiment is newly defined can be compiled with further reference to Fig. 3, NLRI fields
The detailed meanings of each field in code are as follows：
Length：2 bytes.If BGP Update message is directed to distributed defined in the present embodiment
DAM has found and signaling protocol that Length values are set as 15 automatically.
Route-distinguisher：8 bytes, its implication, coded format and application method and BGP-AD (RFC 6074)
It is identical.
PE system ip address：4 bytes, PE system ip address, its implication, coded system and user
Method is identical with BGP-AD (RFC 6074).
VN Context ID：3 bytes, this is the field of the present embodiment newly definition, and its value is one virtual
Virtual network Context identifier under network example VNI, it can have global sense, also only can locally anticipate
Justice, uniquely to mark the logic under a virtual network example under particular tunnel type to connect.If folded
The tunnel type of screening network is VXLAN (virtual expansible LAN), then the VN Context ID of 24 bits
Field will represent the VXLAN network identities (VXLAN Network Identifier) of 24 bits.If folded
The tunnel type of screening network is NVGRE (using the network virtualization of generic route encapsulation), then 24 bits
VN Context id fields will represent 24 bits virtual subnet mark (Virtual Subnet
Identifier).If the tunnel type of stacking network is MPLS-in-GRE, then 24 bit VN
Minimum 20 significance bits of Context id fields will represent the network entity for sending BGP UPDATE messages and exist
20 bit MPLS (multi-service Tag switching) service label being locally-assigned, 4 significance bits of highest do not have
Meaning, should be all set to zero.
What deserves to be explained is, the implication of foregoing route-distinguisher field and PE system ip address fields and use
Described identical of method and the 3.2.2.1 of RFC 6074 section, does not further relate to herein.
In addition to MP_REACH_NLRI attributes, distributed DAM has found the BGP with signaling protocol automatically
The bgp attribute of the other three key that must be carried in UDFATE message is respectively that " two-layer VPN is (virtual special
With network) mark extended community attribute ", " BGP encapsulate extended community attribute " and " route target extension
Group attribute ".
Two-layer VPN identifies extended community attribute
Two-layer VPN mark extended community attribute is also existed in the BGP UPDATE messages of BGP-AD, it
Implication, coded system and application method with it is consistent described by RFC 6074, it indicates BGP UPDATE
Two-layer VPN mark associated by message.In embodiment of the present invention DAM application scenarios of interest, two layers
VPN mark extended community attributes can identify a specific virtual network example in a specific DAM system,
Such as IP operation path or L2VPN service paths, its value must be locally configured in the net of each DAM module
Network is physically.
BGP encapsulates extended attribute
BGP encapsulate extended attribute existing L2VPN/VPLS signaling protocols (BGP-AD, BGP-VPLS,
BGP-MH all do not exist in BGP UPDATE messages), existing these L2VPN/VPLS signaling protocols are all
Tunnel type parameter can not be transmitted.BGP encapsulation extended attributes are defined in RFC 5512, and it is a BGP
Opaque extended community attribute (type codes=0x030c), the tunnel for indicating stacking network tunnel encapsulation
Road type.In inventive embodiments, current definable supports tunnel type 8,9 and 11, corresponds respectively to
VXLAN, NVGRE and MPLS-in-GRE tunnel type.
What deserves to be explained is, in tunnel type existing so far, only VXLAN, NVGRE and
The class tunnels of MPLS-in-GRE tri- are applied to DAM application scenarios, and at present, IETF NVO3 working groups are still in research
Other new tunnel types.After it is new and be suitable for the tunnel type of DAM application scenarios formally issue after, can
New tunnel type is supported by simple extension, this need to transmit new tunnel in BGP encapsulation extended attributes
Road type codes.
Route target extended community attribute
RT (route target) extended community attribute exists in the BGP of other L2VPN/VPLS signaling protocols
In UPDATE message, it is used to control the topological structure in stacking network tunnel, referring to Fig. 2, in distributed DAM
Under application scenarios, all of center module (ERM, CPM and SPM) constitutes full-mesh topology each other,
I.e. they can directly transmit and receive packet between any two；They constitute distribution as an entirety
The center (Hub) of formula DAM.All of RAM module constitutes the spoke (Spoke) of DAM systems, i.e., often
Individual RAM module is only capable of being directly transmitted between center module and received packet, and RAM module is between any two not
Can directly transmit and receive packet.By for each DAM module, suitable input RT (Import are set
RT suitable RT extended community attributes), and on each the BGP UPDATE message for sending are set (referred to as
Export RT), distributed DAM can form the center-spoke (hub-and-spoke) desired by us
Topological structure.
In addition to discussed above 4 crucial bgp attributes, the BGP UPDATE messages of DAM applications are also optional
Ground carries other bgp attributes, and due to other bgp attributes, discovery is unrelated with signaling mechanism automatically with DAM,
The present invention will not enumerate.
What deserves to be explained is, add as suggested in the present invention for BGP-DAM agreements, new BGP UPDATE
Message format, so far, for L2VPN/VPLS signaling protocols (AFI=25 in NLRI fields,
SAFI=65), a total of 4 class BGP UPDATE messages.When these BGP UPDATE messages are received,
DAM network entities should be able to correctly identify BGP-DAM message, and import BGP-DAM protocol processes journeys
It is further processed in sequence.BGP-DAM message and other existing L2VPN/VPLS signaling messages (BGP-AD,
BGP-VPLS, BGP-MH etc.) can by judge NLRI field Length subfields value whether be 15 come
Distinguish.If the value of NLRI field Length subfields is 15, then the BGP UPDATE messages are
BGP-DAM message；If other values, then the BGP UPDATE messages are not BGP-DAM message.
Fig. 4 be the present invention provide distributed DAM model schematics example, remotely access multiplexer RAM1,
In the various modular units of RAM2：MAC (medium education) module, completes specific access technology physics
The user of layer accesses, for example：Cable based on DOCSIS data over cable service interface specifications accesses skill
The soft exchange technology or various of art, EPON ethernet passive optical networks and GPON gigabit passive optical networks
The access technology of type digital subscriber line xDSL.L2/L3 (two/layer of layer three) transponder, realizes being based on
Two layers or three layers of data forwarding, for example：It can include three layers of IP business retransmission device and L2VPN
Business retransmission device；NVE (network virtualization edge) device NVE1, NVE2 is crucial NVO3 function realities
Body, is responsible for setting up and safeguarding various types of network virtualization tunnels, multiple such network virtualization tunnels
Constitute network entity between a stacking network tunnel, and by the data from L2/L3 transponders according to
Specified type is encapsulated, and the DAM modules of distal end are sent to by foregoing superposition tunnel.Thus, different DAM modules
An entirety is mutually all unified into by a NVO3 stacking network, NME devices can be by multiple mutually isolated nets
Network virtualizes tunnel to support multiple mutually isolated business.Legend shows that two mutually isolated networks are empty
Planization tunnel, respectively bearer IP service and L2VPN business, in same network tunnel, they respectively by
Two independent virtual network context VN Context ID1, VN Context ID2 are distinguished.And
In edge router module ERM, the business for determining sending network side by its NVE device will be local by its
L2/L3 transponders are further forwarded to network side.
As it was previously stated, a key element in distribution DAM is the NVE devices in each mixed-media network modules mixed-media, make
It is a kind of functional entity, it helps set up network virtualization tunnel between network entity.This task is completed,
One is safeguarded in each NVE device by the foregoing DAM VNI that discovery and signaling mechanism are set up automatically and phase
The NVO3 tunnel mapping tables answered, the mapping table at least includes：A specific void in mark DAM systems
Intend network example VNI, the IP address of correspondent network entity, the void under a virtual network example VNI
Intend network context mark VN Context ID, set up the tunnel type of NVO3 tunnel encapsulations.According to reality
The difference of existing technology and tunnel encapsulation agreement, virtual network Context identifier VN Context ID can have difference
Mark meaning, for example：If the tunnel type of tunnel encapsulation is VXLAN, then the virtual network is upper and lower
Text mark VN Context ID represent VXLAN Network Identifier (VXLAN network identities)；
If the tunnel type of the tunnel encapsulation is NVGRE, the virtual network Context identifier VN Context
ID represents VSID (virtual subnet mark)；If the tunnel type of the tunnel encapsulation is MPLS-in-GRE,
So described virtual network Context identifier VN Context ID are by comprising sending BGP UPDATE messages
NME functional entitys are in 20 bit MPLS service labels being locally-assigned.
Legend 5 for convenience of description, provides a virtual network for simplified couple in multiplexer DAM generations
Mapping table schematic diagram between example and corresponding network virtualization tunnel.In the mapping table, each DAM
Virtual network example in module can respectively by local virtual network instance identification and the two-layer VPN mark of the overall situation
Know to represent, wherein, global two-layer VPN mark is identified by the two-layer VPN of foregoing BGP-DAM message
Extended community attribute is published to other DAM modules.Each virtual network example has some corresponding NVO3
Parameters for tunnel, including correspondent network entity IP address, NVO3 tunnel encapsulations type and virtual network are upper and lower
Text mark, virtual network Context identifier can use different mark sides according to the difference of tunnel encapsulation type
Formula.So, when DAM modules send user data to the DAM modules of tunnel opposite end, can be according to these
Parameters for tunnel carrys out encapsulated user data, and three kinds of NVO3 tunnels that the present invention is supported exemplarily are shown in figure
Road type, tunnel type 8,9 and 11 corresponds respectively to VXLAN, NVGRE and MPLS-in-GRE in mapping table
Tunnel type；Meanwhile, each DAM module can support multiple virtual network examples, multiple mutual for carrying
The customer service of isolation, such as public's IP operation, L2VPN business etc..
Fig. 6 shows the relation schematic diagram between DAM equipment L2/L3 transponders and virtual network example,
During one remotely accesses multiplexer RAM, multiple customer services respectively by independent virtual access point with it is corresponding
Virtual network example be connected so that customer service can be crossed being entered by corresponding virtual access point
The corresponding virtual network examples of DAM, for example：IP operation will pass through virtual net by virtual access point VAP1
Network example VNI1 is packaged and forwards；L2VPN business 1 will be by virtual access point VAP2 by virtual
Network example VNI2 is packaged and forwards.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention
Can add the mode of required hardware platform by software to realize, naturally it is also possible to all by hardware come real
Apply, but the former is more preferably implementation method in many cases.Based on such understanding, technical side of the invention
What case contributed to background technology can be embodied in the form of software product in whole or in part, the meter
Calculation machine software product can be stored in storage medium, such as ROM/RAM, magnetic disc, CD, including some
Instruction is used to so that a computer equipment (can be personal computer, server, or network equipment etc.)
Perform the method described in some parts of each embodiment of the invention or embodiment.
The above embodiments are merely illustrative of the technical solutions of the present invention rather than is limited, although reference
Preferred embodiment has been described in detail to the present invention, it will be understood by those within the art that：Its
Technical scheme can still be modified or equivalent, and these are changed or equally replace
Change the spirit and scope that can not also make amended technical scheme depart from technical solution of the present invention.
Claims (12)
1. network entity automatic discovering method, network entity in a kind of distributed couple in multiplexer DAM systems
Between pass through Border Gateway Protocol (BGP) message exchange routing iinformation, it is characterised in that：
The Border Gateway Protocol (BGP) message is UPDATE message, and it is included with properties：
MP_REACH_NLRI attributes, two-layer VPN mark extended community attribute, BGP encapsulation extended community attribute, road
By target extended community attribute, wherein：
MP_REACH_NLRI attributes, for issuing up to the purpose network information and corresponding next hop information,
And transmit the virtual network Context identifier under a virtual network example；
Two-layer VPN identifies extended community attribute, specific virtual for identifying one in distributed DAM systems
Network example；
BGP encapsulates extended community attribute, the tunnel type for indicating stacking network tunnel encapsulation；
Route target extended community attribute, the topological structure for controlling stacking network tunnel.
2. the method for claim 1, it is characterised in that the MP_REACH_NLRI attributes include：
Length field, the length for defining the MP_REACH_NLRI attributes；
Virtual network Context identifier domain, for representing a virtual network reality under correspondence particular tunnel type
The virtual network Context identifier of example.
3. method as claimed in claim 1 or 2, it is characterised in that the tunnel type is can virtually to expand
Exhibition LAN VXLAN, the virtual network Context identifier represents virtual expansible local net network mark.
4. method as claimed in claim 1 or 2, it is characterised in that the tunnel type is using general
The network virtualization NVGRE of routed encapsulation, the virtual network Context identifier is represented and uses general route envelope
The network virtualization NVGRE virtual subnets mark of dress.
5. method as claimed in claim 1 or 2, it is characterised in that the tunnel type is using general
The multiprotocol label switching MPLS-in-GRE of routed encapsulation, the virtual network Context identifier is included and sent
The functional entity of UPDATE message is in the multiprotocol label switching service label being locally-assigned.
6. network entity in a kind of distributed couple in multiplexer DAM systems, it is characterised in that including：
Network virtualization edge device, by Border Gateway Protocol (BGP) message DAM grids entity it
Between exchange routing iinformation, and accordingly generate the mapping between virtual network example and corresponding network virtualization tunnel
Table and the stacking network tunnel set up between network entity according to the mapping table；
Wherein, the mapping table at least includes：A specific virtual network example in mark DAM systems,
The IP address of correspondent network entity, the virtual network Context identifier under a virtual network example, sets up net
The tunnel type of network tunnel encapsulation.
7. network entity as claimed in claim 6, it is characterised in that the Border Gateway Protocol (BGP) disappears
It is UPDATE message to cease, and it is included with properties：MP_REACH_NLRI attributes, two-layer VPN mark expand
Exhibition group attribute, BGP encapsulation extended community attribute, route target extended community attribute, wherein：
MP_REACH_NLRI attributes, for issuing up to the purpose network information and corresponding next hop information,
And transmit the virtual network Context identifier under a virtual network example VNI；
Two-layer VPN identifies extended community attribute, for identifying a specific virtual network reality in DAM systems
Example；
BGP encapsulates extended community attribute, the tunnel type for indicating stacking network tunnel encapsulation；
Route target extended community attribute, the topological structure for controlling stacking network tunnel.
8. network entity as claimed in claims 6 or 7, it is characterised in that the tunnel type is virtually may be used
Extension LAN VXLAN, the virtual network Context identifier represents virtual expansible LAN VXLAN nets
Network is identified.
9. network entity as claimed in claims 6 or 7, it is characterised in that the tunnel type is to use
The network virtualization NVGRE of generic route encapsulation, the virtual network Context identifier is represented using general road
Identified by the network virtualization NVGRE virtual subnets for encapsulating.
10. network entity as claimed in claims 6 or 7, it is characterised in that the tunnel type is to use
The multiprotocol label switching MPLS-in-GRE of generic route encapsulation, the virtual network Context identifier is included
The functional entity of UPDATE message is sent in the multiprotocol label switching MPLS service labels being locally-assigned.
11. network entity as claimed in claims 6 or 7, it is characterised in that the network entity is further
Including：
The layer transponder of two/layer three, realizes based on two layers or three layers of data forwarding；The network virtualization side
Data from the transponder of two/layer of layer three are encapsulated, passed through by edge device according to the mapping table with specified type
Network tunnel is sent to corresponding far-end network entity, or by the network tunnel data solution from far-end network entity
After encapsulation, it is sent to the transponder of two/layer of local layer three.
12. a kind of distributed couple in multiplexer DAM stacking network systems, it is characterised in that will including such as right
Seek the network entity described in 6 to 11.
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