CN101043395A - City domain ethernet network bridge, system and method for providing service - Google Patents
City domain ethernet network bridge, system and method for providing service Download PDFInfo
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Abstract
The disclosed Ethernet edge bridge comprises a bridging member including a US port, a NS port and a transmission entity. It also discloses a MAN system including a user bridge network and a provider backbone network. Wherein, the user bridge network connects with the backbone network, and the latter connects with each other through the bridge network. This invention also discloses the method for providing service on edge of the MAN, which comprises: the user bridge network accesses with the US port of MAC-in-MAC edge bridge; the US port builds mapping table between the virtual user ID and provider business, and the MAC-in-MAC edge bridge completes the business mapping or port mapping according to data message and mapping relation.
Description
Technical field
The present invention relates to the Metro Ethernet technical field, relate in particular to a kind of Metro Ethernet bridge, system and method.
Background technology
Ethernet (Ethernet) is originally a kind of Local Area Network technology, and its development has been experienced from hub (HUB) to bridge (Bridge), arrives the process of virtual local area network technology (VLAN) again.Vlan technology is by the destination address (DA at the ether data message, Destination Address) and source address (SA, Source Destination) label (TAG) is inserted in the back, utilize 12 bit virtual identifying (VID among the TAG, Virtual ID) the ether data message is divided into different basins, make and can logically set up a plurality of (4K at most) virtual local area network (LAN) on the physical LAN, typically, the Ethernet message of a band TAG adopts following form:
| DA | SA | TAG (containing VID) | Load | Verification |
In recent years, development of Ethernet technology has begun to move towards metropolitan area network from local area network (LAN), scale that the needed Metro Ethernet requirement of operator is bigger and more basin but (4K not enough far away), and requirement and user network isolation (VLAN of the two can not mix).In order to realize the extensibility of Ethernet, support big capacity ether bearer network, and user-isolated network and operator's bearer network, the ieee standard tissue has proposed Q-in-Q scheme and MAC-in-MAC scheme.Fig. 1 is a Q-in-Q networking plan schematic diagram of the prior art; Fig. 2 is a MAC-in-MAC networking plan schematic diagram of the prior art.
Many bridging components in IEEE 802.1, have been defined simultaneously, so-called bridging component is exactly by a plurality of ports and the forwarding parts that Delivery Function constitutes, be responsible for the data message forwarding of receiving from a port to another port, from model, a bridge is realized can containing a bridging component, perhaps integrated a plurality of bridging components.
User's VLAN (C-VLAN) assembly is the traditional vlan bridging parts of IEEE Std 802.1q definition, and its topmost characteristics are can discern and process user label (C-TAG), and the C-TAG form is as follows:
| Type (0x8100) | Priority | CFI | VID |
Operator's VLAN (S-VLAN) assembly is that the key of operator's bridge of IEEE P802.1ad definition is transmitted parts, its topmost characteristics are to discern and to handle operator's label (S-TAG), and do not remove to discern C-TAG, S-TAG and C-TAG form are very similar, but the type difference of being distributed.The S-TAG form is as follows:
| Type (0x88a8) | Priority | DEI | VID |
Because being bridging component, assembly all is used for transmitting data message, for convenience, and from the forward-path of data message, if the more close user of certain port, then be called user-side port, if the more close network core of certain port then is called network-side port.Some assembly is symmetrical, all ports are all the same, both can be used for user side, also can be used for network side, such as C-VLAN assembly and S-VLAN assembly, but below two kinds of assemblies will mentioning be asymmetric, its port has is specifically designed to user side, what have is specifically designed to network side, such as I assembly and B assembly.
The I assembly is the crucial forwarding component of the defined MAC-in-MAC edge bridges of IEEE P802.1 ah, it is based on a S-VLAN bridging component, but its port is divided into user-side port and network side (being the backbone network side) port, provide S-Tagged interface or transparent (Transparent) interface at user side, at network side identification and processing I labelled component (I-TAG), utilize that srvice instance ID (I-SID) association takes out virtual instance port among the I-TAG, EISS is provided (Enhanced Internal Sublayer Service, with reference to IEEE802.1q) service, a plurality of virtual instance port down merge into an ISS port (up an ISS then resolves into a plurality of EISS by I-SID) again, (Backbone Source Address B-SA) just disposes on this ISS port backbone source address.To finish the mapping of S-VID on the I assembly to I-SID, be the mapping of srvice instance, this is to finish in the configuration virtual instance port, in the time of data forwarding, on virtual port, to finish insertion/deletion of I-TAG, on key side ISS, finish the MAC-in-MAC encapsulation/decapsulation.The I-TAG typical format is as follows:
| Type | Priority | I-SID | C-DA (customer objective address) | C-SA (user source address) |
The B assembly is also based on a S-VLAN bridging component, I-TAG can be discerned and handle to its user side, network side is the same with common S-VLAN assembly, but the handled MAC Address of B assembly is key MAC Address, so the user-side port of B assembly is commonly used to connect I assembly or another B assembly.
IEEE 802.1 again from the management and the angular divisions of technology the level of network, comprising:
User's bridge network (Customer Bridged Network) refers in particular to the Ethernet of setting up based on IEEE Std 802.1q, in IEEE P802.1ad/ah and the present invention, it is considered as Metro Ethernet service object will be provided.
It is the carrier network that the Q-in-Q scheme is set up that operator's bridge network (Provider Bridged Network) refers in particular to based on IEEE 802.1ad, be used for providing the ether service to user's bridge network, it has further expanded Ethernet and has realized the isolation of Service VLAN and user vlan.
It is the key Ethernet that the MAC-in-MAC scheme is set up that key bridge network (Backbone Bridged Network) refers in particular to based on IEEE 802.1ah, is mainly used in a plurality of operators of interconnection bridge network.
The bearer network that Metro Ethernet general reference operator utilizes the ether technology to set up, the saying of narrow sense, the operator's bearer network that refers to use above-mentioned operator bridge network and key bridge network to be constituted exactly.
So-called Q-in-Q, be meant the meaning of nested VLAN, the Q-in-Q scheme has expanded one deck VLAN label again on the basis of original VLAN, make basin quantity reach 4K * 4K, and carrier network only uses the outside VLAN label to do the forwarding foundation, promptly set up the VLAN of operator oneself, be called Service VLAN (S-VLAN, Service Provider VLAN), so just the VLAN that will define originally is called user vlan (Customer VLAN, C-VLAN), the network based on C-VLAN is called user's bridge network, the operator's Ethernet based on the Q-in-Q scheme is called operator's bridge network.
For C-VLAN, there is user vlan ID (C-VID) to be used to distinguish the user basin in the user vlan label (C-TAG) in the data message, and S-VLAN uses the Service VLAN ID (S-VID) in the Service VLAN label (S-TAG) to distinguish the operator basin, contains a plurality of user C-VID among each S-VID of operator.It is as follows that the user data message increases the message format of S-TAG behind the S-VLAN assembly:
| C-DA | C-SA | S-TAG (containing S-VID) | C-TAG (containing C-VID) | Load | Verification |
Defined three kinds of user interfaces based on the Q-in-Q scheme:
1.Port-based Service Interface: based on the service interface of port, promptly the S-VLAN assembly exists to the transparent interface that IEEE Std 802.1d/q provides.Operator bridge network edge provides service based on port to the user, on the S-VLAN that all customer data message (all C-VLAN of this port) that comes from this port all is mapped to this port and is disposed.
2.C-Tagged Service Interface:C-Tagged service interface, operator's bridge network edge device can be discerned C-TAG, even the user data message that comes on the same like this port, can select srvice instance according to C-VID, in general, can dispose a plurality of S-VLAN based on this port, the several C-VLAN of multiple connection under each S-VLAN, this interface comes down to that the C-VLAN assembly provides to IEEE Std802.1q, only S-VLAN assembly and C-VLAN assembly have been realized simultaneously a Provider Edge bridge inside, from model, this is a two Relay model, provide aforementioned service interface based on port by the S-VLAN assembly to the C-VLAN assembly in edge bridges inside, provide C-Tagged interface by the C-VLAN assembly to the user then.
3.S-Tagged the S-Tagged service interface that Service Interface:S-VLAN assembly provides to IEEE P802.ad, user's bridge network edge device can be discerned S-VLAN, and user's bridge network is just submitted to data message operator's bridge network after finishing the Q-in-Q encapsulation.
Easy easy-to-use Q-in-Q scheme has solved the scaling concern of Ethernet to a certain extent, make that number of users rolls up in the Ethernet, but, because it is thorough inadequately in the Q-in-Q scheme to the isolation of user network, operator's bridge network has to learn user's MAC address, make the forwarding tables of data that bridge will set up (Filter Database, FDB) list item rolls up, this has become to further expand the bottleneck of network size.
The MAC-in-MAC scheme proposes at the edge of key bearer network the whole Ethernet data message from user's bridge network or operator's bridge network to be encapsulated a layer MAC address again and (calls key MAC Address, Backbone MAC Address), form key bridge network, form the tunnel transmission mechanism, set up the MAC access point at key bridge network edge, the key MAC Address of each fringe node drives many user's MAC address.
In key bridge network core, the work behavior of Ethernet and common Ethernet are similar, comprise address learning, forwarding behavior and generate tree etc., and key bridge network also has VLAN, be called backbone VLAN (Backbone VLAN, B-VLAN), (Backbone VLAN TAG, form B-TAG) also S-TAG is the same for its label backbone VLAN TAG.But, finish two big functions: finish encapsulation and the decapsulation of MAC-in-MAC and carry out the srvice instance mapping at the edge of key bridge network.These two functions are finished on the I assembly.Defined service instance tag (the ServiceInstance TAG of a special use in the MAC-in-MAC scheme, I-TAG), include target MAC (Media Access Control) address (the Customer DA of user data message, C-DA) and source MAC (Customer SA, C-SA), also contain among the I-TAG srvice instance sign (Service Instance ID, I-SID), long 24 bits, srvice instance of each value representation.As follows through the MAC-in-MAC encapsulation format that key bridge network edge is finished:
| B-DA | B-SA | B-TAG (containing B-VID) | I-TAG(I-SID、 C-DA、C-SA) | S-TAG (containing S-VID) | C-TAG (containing C-VID) | Load | Verification |
Defined three kinds of user interfaces based on the MAC-in-MAC scheme:
1.Transparent Service Interface: transparent service interface, promptly based on the service interface of port, provide service based on port to operator's bridge network or user's bridge network at key bridge network edge, all data messages that come from this port all are mapped in the srvice instance (ServiceInstance is by the I-SID sign) that disposes for this port.This interface is to be provided by the I assembly in the edge bridges.
2.S-Tagged Service Interface:S-Tagged service interface, the port at key bridge network edge can be discerned S-TAG, do the srvice instance mapping based on S-VID, description according to IEEE P802.1ah has dual mode: each S-VLAN is mapped to a srvice instance and a plurality of S-VLAN is mapped to a srvice instance, also claims S-Tagged Service Bundling Interface.This interface also is that the I assembly by edge bridges provides.
3.I-Tagged Service Interface:I-Tagged service interface, realized the srvice instance mapping at operator's bridge network or user's bridge network edge, and after finishing the MAC-in-MAC encapsulation data message is directly submitted to core backbone, that is to say, realize the B assembly in the edge bridges, and making the I assembly be implemented in user side, the B assembly provides I-Tagged interface to the user.
The advantage of MAC-in-MAC scheme is, for key bridge network, because the transmission in the network core and only transmit MAC Address with backbone edge MAC access point as transmitting foundation, and fringe node quantity is not a lot, so the FDB of key Ethernet core can be very not big, but this scheme still is positioned at key bridge network edge at present basically, mainly be in the face of operator's bridge network, though also defined transparent service interface, direct user oriented bridge network to a certain extent, but but not as operator's bridge, definition C-Tagged interface can not provide more fine-grained service.
Summary of the invention
The purpose of this invention is to provide a kind of Metro Ethernet edge bridges, enable to provide flexibly various service interfaces, and in MAC-in-MAC Metro Ethernet edge bridges, realize inserting user's bridge network, push the MAC-in-MAC bridge to customer edge with thinner granularity.
For this reason, the invention provides a kind of Metro Ethernet edge bridges, comprise an asymmetric bridging component, this asymmetric bridging component comprises user-side port, network-side port and Delivery Function, wherein,
User-side port is used for providing transparent interface to user network, the virtual support user ID, and utilize described Virtual User ID to realize related with the Operator Specific Service example;
Network-side port, be used for receiving and still not containing the data message of backbone network label to the label that contains relevant Operator Specific Service example of backbone network transmission MAC-in-MAC encapsulation from key Ethernet, support a plurality of Operator Specific Service examples, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation;
Delivery Function is used to set up the forwarding mapping table of station address, key address, bridge port and Operator Specific Service example, and carries out message and transmit.
The described user-side port nonrecognition of Metro Ethernet edge bridges provided by the invention and processing carrier network label and user network label.
Described Metro Ethernet edge bridges provided by the invention can also comprise a backbone bridge relay part, wherein, described backbone bridge relay part provides the network side interface and provides the label interface of related Operator Specific Service example to described asymmetric bridging component, and the user-side port of described asymmetric bridging component provides transparent interface to user network.
Described Metro Ethernet edge bridges can also comprise at least one operator's VLAN bridging component, wherein, described operator VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described operator VLAN bridging component.
Described Metro Ethernet edge bridges can also comprise at least one user's VLAN bridging component, wherein, described user's VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described user's VLAN bridging component.
Described Metro Ethernet edge bridges can also comprise at least one operator's VLAN bridging component and at least one user's VLAN bridging component, described user's VLAN bridging component is used to provide user side interface, described asymmetric bridging component is used to provide the network side interface, and, in described bridge inside, described asymmetric bridging component is used for providing transparent interface to described operator VLAN bridging component, and described operator VLAN bridging component is used for providing transparent interface to described user's VLAN bridging component.
Described asymmetric bridging component in the Metro Ethernet edge bridges provided by the present invention provide to inner other bridging components of bridge transparent in, also provide user-side port to user network.
The network-side port of Metro Ethernet edge bridges provided by the present invention, can support a plurality of virtual ports, the related Operator Specific Service example of each virtual port, virtual ID of each port arrangement, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation.
The invention also discloses a kind of Metro Ethernet system, comprise user's bridge network and operator backbone bridge network, it is characterized in that, described user's bridge network is connected to described operator backbone bridge network by the Provider Edge bridge, connects by the backbone network edge bridges between the described operator backbone bridge network.
Described backbone network edge bridges and Provider Edge bridge are all supported the MAC-in-MAC access way.
Described Provider Edge bridge comprises an asymmetric bridging component, and this asymmetric bridging component comprises user-side port, network-side port and Delivery Function, wherein,
User-side port is used for providing transparent interface to user network, the virtual support user ID, and utilize described Virtual User ID to realize related with the Operator Specific Service example;
Network-side port, be used for receiving and still not containing the data message of backbone network label to the label that contains relevant Operator Specific Service example of backbone network transmission MAC-in-MAC encapsulation from key Ethernet, support a plurality of Operator Specific Service examples, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation;
Delivery Function is used to set up the forwarding mapping table of station address, key address, bridge port and Operator Specific Service example, and carries out message and transmit.
Wherein, network-side port also can be supported a plurality of virtual ports, the related Operator Specific Service example of each virtual port, and virtual ID of each port arrangement, the insertion/deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation.
Described Provider Edge bridge also comprises at least one operator's VLAN bridging component, wherein, described operator VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described operator VLAN bridging component.
Described Provider Edge bridge also comprises at least one user's VLAN bridging component, wherein, described user's VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described user's VLAN bridging component.
Described Provider Edge bridge also comprises at least one operator's VLAN bridging component and at least one user's VLAN bridging component, described user's VLAN bridging component is used to provide user side interface, described asymmetric bridging component is used to provide the network side interface, and, in described bridge inside, described asymmetric bridging component is used for providing transparent interface to described operator VLAN bridging component, and described operator VLAN bridging component is used for providing transparent interface to described user's VLAN bridging component.
The invention also discloses a kind ofly provides service method at the Metro Ethernet edge, comprising:
User's bridge network is connected to the user-side port of Metro Ethernet edge bridges;
Based on the user-side port of Metro Ethernet edge bridges, set up the mapping relations table of Virtual User ID and operator service;
Metro Ethernet edge bridges recognition data message is also finished srvice instance mapping or outbound port mapping according to described mapping relations.
Description of drawings
Fig. 1 is a Q-in-Q networking plan schematic diagram of the prior art;
Fig. 2 is a MAC-in-MAC networking plan schematic diagram of the prior art;
Fig. 3 a is based on the edge bridges structural representation of I ' component construction in the embodiment of the invention one;
Fig. 3 b is based on the edge bridges structural representation of I ' assembly and S-VLAN component construction in the embodiment of the invention two;
Fig. 3 c is based on the edge bridges structural representation of I ' assembly and C-VLAN component construction in the embodiment of the invention three;
Fig. 3 d is based on the edge bridges structural representation of I ' assembly, S-VLAN assembly and C-VLAN component construction in the embodiment of the invention four;
Fig. 4 in the embodiment of the invention five based on I ' assembly and the C-VLAN assembly edge bridges structural representation that constituted of integrated B assembly also;
The Metro Ethernet system schematic that Fig. 5 proposes for the present invention.
Embodiment
Express clearlyer for making the purpose, technical solutions and advantages of the present invention, the present invention is further described in more detail below in conjunction with drawings and the specific embodiments, need to prove that embodiments of the invention only are used for explaining the present invention, but do not represent limitation of the invention.
The invention provides a kind of bridging component of Metro Ethernet bridge, be called I ' assembly in the present embodiment, the asymmetric assembly that this assembly is made of a Delivery Function and a plurality of port, its port is divided into two kinds, a kind of is user-side port, and another kind is a network-side port.This assembly is not based on the S-VLAN bridging component simultaneously, and promptly this assembly does not remove identification and treatment S-TAG, but identification and processing I-TAG.
The user-side port function is as follows:
1. receive the IEEE 802.1d/q/ad data message that user network sends, and provide transparent interface the user-side port that is attached thereto;
2. support a virtual ID, all related this virtual ID of the data message on all these ports, the pairing srvice instance of the related I-SID of this virtual ID;
3. provide C-DA, C-SA and virtual ID as transmitting foundation to Delivery Function.
Network-side port key feature and function are as follows:
1. receive the data message that contains I-TAG of MAC-in-MAC encapsulation from key Ethernet;
2. support a plurality of I-SID, be responsible for inserting and deletion I-TAG;
3. on port, dispose the backbone network source address, carry out the MAC-in-MAC encapsulation/decapsulation of data message.
Delivery Function key feature and function are as follows:
1. set up the forwarding mapping table of station address and Operator Specific Service example according to user's MAC address, I-SID information, user-side port and network-side port information;
2. according to user's MAC address, the aforesaid forwarding mapping table of I-SID information index, determine port, message information is offered outbound port,, then simultaneously provide key MAC Address parameter to port if outbound port is a network-side port.
Simultaneously, the present invention also provides another Ethernet bridge relay part, is called I, and " assembly, this assembly comprises user-side port, network-side port and Delivery Function.Different with I ' assembly is that " network-side port of assembly comprises at least one ISS, and described ISS supports a plurality of EISS virtual ports, the related I-SID of each virtual port at I.Configuration virtual ID on the user-side port of this assembly, also configuration virtual ID on network-side virtual port, the virtual ID that one or more user-side port disposed must be identical with the virtual ID on certain virtual port, user-side port provides transparent interface to the user, the data message that comes up from the user is through after transmitting, arrived virtual port and then set up I-TAG, entered ISS then and carry out the MAC-in-MAC encapsulation according to its associated I-SID.
Though I ' assembly and I " assembly is realized different in inside; its external interface is the same; the function that is realized is also identical; exactly user-side port is mapped on the srvice instance; wherein a plurality of user-side port can be shone upon same srvice instance; and described user-side port only is a transparent interface to IEEE 802.1d/q/ad, this point and present IEEE 802.1ah are distinguishing.
Fig. 3 a is based on the edge bridges structural representation of I ' component construction in the embodiment of the invention one.As previously mentioned, I ' assembly is a kind of asymmetric bridging component, and user-side port can only be used to connect user's bridge network, and network-side port can only be used to connect carrier network or operator backbone bridge network.
In this bridge, user-side port only provides transparent interface, each port can only be mapped on the associated srvice instance of I-SID to user network (comprising IEEE 802.1d/q/ad), but a srvice instance can corresponding a plurality of ports.By realize the mapping of port and srvice instance in this user-side port configuration service example and virtual ID.Network-side port is finished insertion/deletion of MAC-in-MAC encapsulation/decapsulation and I-TAG, and each network-side port can related a plurality of I-SID.The Delivery Function user sets up the forwarding mapping table of station address and Operator Specific Service example by MAC Address, I-SID, key MAC Address, finishes message forwarding.
Fig. 3 b is based on the edge bridges structural representation of I ' assembly and S-VLAN component construction in the embodiment of the invention two.This bridge is made of an I ' assembly and at least one S-VLAN assembly, wherein the S-VLAN assembly provides user-side port, I ' assembly provides network-side port, I ' assembly provides transparent interface to the S-VLAN assembly simultaneously, the I assembly based on S-VLAN of IEEE P802.1ah definition at present is considered to a special case of this situation, its function is equivalent to an I ' assembly and adds a S-VLAN assembly, especially when that I-SID is virtual is all the more so when being the empty port of network side.
Among the present invention, the S-VLAN assembly only provides transparent interface to the user network of IEEE 802.1d/q as user-side port, by make each port or a plurality of port be mapped to earlier on the associated S-VLAN of S-VID at user port configuration PVID, make each S-VLAN be mapped on the srvice instance (this also is a kind of situation of the I assembly defined of IEEE P802.1ah, is a special case of present embodiment) then or a plurality of S-VLAN is mapped on the srvice instance.
Wherein, user-side port only provides the S-Tagged interface to the user network of IEEE P802.1ad, and it can be mapped to the different S-VLAN from user-side port on the different srvice instance like this.In described edge bridges inside, I ' assembly provides transparent interface to S-VLAN, and set up the mapping relations of station address and Operator Specific Service example simultaneously, the forwarding mapping relations of described edge bridges are formed by user's MAC address, I-SID, S-VID, key MAC Address and port association.The network-side port of described edge bridges is finished insertion/deletion of MAC-in-MAC encapsulation/decapsulation and I-TAG, and each network-side port may related a plurality of I-SID.
From model, an I ' assembly and a S-VLAN assembly can synthesize a described I assembly based on S-VLAN of IEEE 802.1ah, and this can realize by the merging of two forwarding relation tables and the merging of port function.
From port, the user-side port of I assembly is to be provided by the S-VLAN assembly merely, the network-side port of I assembly then is the network-side port of I ' assembly, the processing of I-SID is abstract to be the empty port of EISS, a plurality of S-VID under empty port can dispose have just formed the mapping relations of S-VID to I-SID naturally.
Fig. 3 c is based on the edge bridges structural representation of I ' assembly and C-VLAN component construction in the embodiment of the invention three.This edge bridges is made of an I ' assembly and at least one C-VLAN assembly, and the C-VLAN assembly is to providing user-side port, and I ' assembly provides network-side port, and simultaneously, I ' assembly provides transparent interface to the C-VLAN assembly.Wherein,
User-side port provides transparent interface to the user network of IEEE 802.1d, realize single port or the associated C-VLAN of a plurality of port mapping to a C-VID by configuration PVID on user port, make each C-VLAN be mapped on the srvice instance then or a plurality of C-VLAN is mapped on the srvice instance; User-side port provides C-Tagged interface to the user network of IEEE P802.1q, and it can be mapped to the C-VLAN that comes from user-side port on the different srvice instance like this, and promptly the granularity with C-VLAN inserts the user; In described edge bridges inside, I ' assembly provides transparent interface to C-VLAN, and realizes the srvice instance mapping relations in described transparent interface; The network-side port of described bridge is finished insertion/deletion of MAC-in-MAC encapsulation/decapsulation and I-TAG, and each network-side port can related a plurality of I-SID; The mapping relations of the station address of described edge bridges and Operator Specific Service example are formed by user's MAC address, I-SID, C-VID, key MAC Address and port association.
Thinking in conjunction with IEEE P802.1ah, edge bridges of the present invention also has a kind of special case, stipulate an I ' assembly and a C-VLAN combination exactly, primordial is directly set up the mapping relations of C-VID to I-SID in the I of C-VLAN assembly on this assembly.The edge bridges principal character of Xing Chenging is like this, user side at this bridge provides C-Tagged service interface, make the backbone network edge bridges directly to select srvice instance according to C-VID, and then make the operator backbone bridge network directly to provide the ether service to user's bridge network, and needn't be through the operator's bridge network based on the Q-in-Q scheme, its advantage is can finish isolation (MAC-in-MAC) completely at customer edge, reduced the level of network, promote the development of MAC-in-MAC backbone core network, alleviated the pressure of Q-in-Q network.
Shown in Fig. 3 c, I assembly based on C-VLAN is that a C-VLAN transmits bridging component, its user-side port can be discerned C-TAG, port VID (the Port VID of configuration, PVID) also resolve according to C-VID, its backbone network side ports is divided into many virtual ports, the related I-SID of each virtual port, each virtual port perception C-TAG, the PVID of configuration also resolves according to C-VID, finishing the related of C-VID and I-SID on the I assembly based on C-VLAN, particularly, is exactly the C-VLAN under the configuration on the associated virtual port of each I-SID.
The backbone network data message extracts I-TAG after being received by the I assembly, determines the virtual port into EISS according to I-SID, looks into FDB with C-VID associating C-DA then, and determining port is the C-Tagged interface.
Fig. 3 d is based on the edge bridges structural representation of I ' assembly, S-VLAN assembly and C-VLAN component construction in the embodiment of the invention four.This edge bridges comprises that an I ' assembly and at least one S-VLAN assembly and at least one C-VLAN assembly constitute, the C-VLAN assembly provides user-side port, I ' assembly provides network-side port, in this bridge inside, I ' assembly provides transparent interface to the S-VLAN assembly, and the S-VLAN assembly provides transparent interface to C-VLAN.Special case is, an I ' assembly and a S-VLAN assembly are arranged in the bridge, and the two is combined into the I assembly, is connected to the C-VLAN assembly of user side then, and the I assembly provides transparent interface to the C-VLAN assembly.Wherein,
Provide transparent interface based on the user-side port of C-VLAN to the user network of IEEE 802.1d, by realize the mapping of the C-VLAN that single port or a plurality of port to a C-VID are associated at user port configuration PVID, behind the data message process C-VLAN assembly of user port, enter the S-VLAN assembly, single or a plurality of C-VLAN are mapped to again on the S-VLAN, enter then in I ' assembly, single or a plurality of S-VLAN are mapped on the srvice instance.
Provide C-Tagged interface based on the user-side port of C-VLAN to the user network of IEEE P802.1q, can be mapped to the C-VLAN that comes from user-side port on the different srvice instance like this, promptly the granularity with C-VLAN inserts the user.
In described edge bridges inside, I ' assembly provides transparent interface to S-VLAN, and the S-VLAN assembly provides transparent interface to the C-VLAN assembly, and the srvice instance mapping relations are determined by twice relaying.
The network-side port of described bridge is finished insertion/deletion of MAC-in-MAC encapsulation/decapsulation and I-TAG, and each network-side port may related a plurality of I-SID.
The mapping relations of the station address of described edge bridges and Operator Specific Service example are formed by user's MAC address, I-SID, S-VID, C-VID, key MAC Address and port association.
According to the description of IEEE P802.1ah, generally provide I-Tagged interface to the I assembly by the B assembly, promptly the B assembly can be used to do network-side port.Based on I ' assembly that the present invention proposes, the present invention has further proposed a kind of bridge of the B of comprising assembly.Promptly in comprising the bridge of I ' assembly, the B assembly of network side insertion at I ' assembly provides network-side port by the B assembly, and other assemblies that user interface can be provided are as user-side port.Can realize the mapping of station address equally to the Operator Specific Service example.
Fig. 4 is in the embodiment of the invention five and combines the edge bridges structural representation that the B assembly is constituted based on I ' assembly with the C-VLAN assembly.Described B assembly provides network-side port, the C-VLAN assembly provides user-side port, and in described bridge inside, the B assembly provides I-Tagged interface to I ' assembly, I ' assembly provides transparent interface to the C-VLAN assembly, and the C-VLAN assembly provides C-tagged interface or transparent interface at different user's messages.
Though the present invention has only provided an execution mode that inserts the B assembly in based on I ' assembly edge bridges, should be noted that the way of inserting the B assembly in whole edge bridges disclosed in this invention, all belongs to design scope of the present invention.
Referring to Fig. 5, the present invention also provides a kind of Metro Ethernet system, comprises user's bridge network and operator backbone bridge network.User's bridge network is connected to the operator backbone bridge network by the Provider Edge bridge in this network, connects by the backbone network edge bridges between each operator backbone bridge network.Wherein the Provider Edge bridge realizes that the user inserts and the srvice instance mapping, finishes secondary MAC encapsulation in the network-side port of I ' assembly (or I assembly) then.The operator backbone bridge network is realized interconnection by the I-Tagged interface of backbone network edge bridges.
Metro Ethernet of the present invention system, comprise user's bridge network and operator backbone bridge network, wherein said user's bridge network is connected to described operator backbone bridge network by the Provider Edge bridge, connects by the backbone network edge bridges between the described operator backbone bridge network.
And described backbone network edge bridges and Provider Edge bridge are all supported the MAC-in-MAC access way.
Described Provider Edge bridge comprises an asymmetric bridging component, this asymmetric bridging component comprises user-side port, network-side port and Delivery Function, wherein, user-side port, be used for providing transparent interface to user network, the virtual support user ID, and utilize described Virtual User ID to realize related with the Operator Specific Service example; Network-side port, be used for receiving and still not containing the data message of backbone network label to the label that contains relevant Operator Specific Service example of backbone network transmission MAC-in-MAC encapsulation from key Ethernet, support a plurality of Operator Specific Service examples, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation; Or be used for receiving and sending the label that contains relevant Operator Specific Service example of MAC-in-MAC encapsulation to backbone network but do not contain the data message of backbone network label from key Ethernet, support a plurality of virtual ports on the network side, the related Operator Specific Service example of each virtual port, virtual ID of each port arrangement, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation; Delivery Function is used to set up the forwarding mapping table of station address, key address, bridge port and Operator Specific Service example, and carries out message and transmit.
And described Provider Edge bridge also comprises at least one operator's VLAN bridging component, wherein, described operator VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described operator VLAN bridging component.
Provider Edge bridge of the present invention also comprises at least one user's VLAN bridging component, wherein, described user's VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described user's VLAN bridging component.
Provider Edge bridge of the present invention also comprises at least one operator's VLAN bridging component and at least one user's VLAN bridging component, described user's VLAN bridging component is used to provide user side interface, described asymmetric bridging component is used to provide the network side interface, and, in described bridge inside, described asymmetric bridging component is used for providing transparent interface to described operator VLAN bridging component, and described operator VLAN bridging component is used for providing transparent interface to described user's VLAN bridging component.
The present invention has also proposed a kind ofly to provide service method at the Metro Ethernet edge based on Metro Ethernet system shown in Figure 5, comprising:
User's bridge network is connected to the user-side port of Metro Ethernet edge bridges;
Based on the user-side port of Metro Ethernet edge bridges, set up the mapping relations table of Virtual User ID and operator service;
Metro Ethernet edge bridges recognition data message is also finished srvice instance mapping or outbound port mapping according to described mapping relations.
Bridge provided by the present invention in a word, system and method can be existing multiple interfaces at the Metro Ethernet edge, can directly provide the ether service to user's bridge network, better realized the isolation of carrier network and user network, reduced the level of network, realize that with thinner granularity the user inserts, and finish the MAC-in-MAC encapsulation/decapsulation simultaneously, the development that this promotes MAC-in-MAC backbone core network makes the operator's bridge network that is positioned at the User Access Layer face and is positioned at the key Ethernet balanced growth of core net aspect.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (16)
1, a kind of Metro Ethernet edge bridges is characterized in that, comprises an asymmetric bridging component, and this asymmetric bridging component comprises user-side port, network-side port and Delivery Function, wherein,
User-side port is used for providing transparent interface to user network, the virtual support user ID, and utilize described Virtual User ID to realize related with the Operator Specific Service example;
Network-side port, be used for receiving and still not containing the data message of backbone network label to the label that contains relevant Operator Specific Service example of backbone network transmission MAC-in-MAC encapsulation from key Ethernet, support a plurality of Operator Specific Service examples, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation;
Delivery Function is used to set up the forwarding mapping table of station address, key address, bridge port and Operator Specific Service example, and carries out message and transmit.
2, Metro Ethernet edge bridges as claimed in claim 1 is characterized in that, described user-side port nonrecognition and processing carrier network label and user network label.
3, bridge as claimed in claim 2, it is characterized in that, described bridge also comprises a backbone bridge relay part, wherein, described backbone bridge relay part provides the network side interface and provides the label interface of related Operator Specific Service example to described asymmetric bridging component, and the user-side port of described asymmetric bridging component provides transparent interface to user network.
4, Metro Ethernet edge bridges as claimed in claim 2, it is characterized in that, described bridge also comprises at least one operator's VLAN bridging component, wherein, described operator VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described operator VLAN bridging component.
5, Metro Ethernet edge bridges as claimed in claim 2, it is characterized in that, described bridge also comprises at least one user's VLAN bridging component, wherein, described user's VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described user's VLAN bridging component.
6, Metro Ethernet edge bridges as claimed in claim 2, it is characterized in that, described bridge also comprises at least one operator's VLAN bridging component and at least one user's VLAN bridging component, described user's VLAN bridging component is used to provide user side interface, described asymmetric bridging component is used to provide the network side interface, and, in described bridge inside, described asymmetric bridging component is used for providing transparent interface to described operator VLAN bridging component, and described operator VLAN bridging component is used for providing transparent interface to described user's VLAN bridging component.
7, as each described Metro Ethernet edge bridges among the claim 3-6, it is characterized in that, described asymmetric bridging component provide to inner other bridging components of bridge transparent in, also provide user-side port to user network.
8, Metro Ethernet edge bridges as claimed in claim 1, wherein, described network-side port is supported a plurality of virtual ports, the related Operator Specific Service example of each virtual port, virtual ID of each port arrangement, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation.
9, a kind of Metro Ethernet system, comprise user's bridge network and operator backbone bridge network, it is characterized in that described user's bridge network is connected to described operator backbone bridge network by the Provider Edge bridge, connect by the backbone network edge bridges between the described operator backbone bridge network.
10, Ethernet system as claimed in claim 8 is characterized in that, described backbone network edge bridges and Provider Edge bridge are all supported the MAC-in-MAC access way.
11, Ethernet system as claimed in claim 9 is characterized in that, described Provider Edge bridge comprises an asymmetric bridging component, and this asymmetric bridging component comprises user-side port, network-side port and Delivery Function, wherein,
User-side port is used for providing transparent interface to user network, the virtual support user ID, and utilize described Virtual User ID to realize related with the Operator Specific Service example;
Network-side port, be used for receiving and still not containing the data message of backbone network label to the label that contains relevant Operator Specific Service example of backbone network transmission MAC-in-MAC encapsulation from key Ethernet, support a plurality of Operator Specific Service examples, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation;
Delivery Function is used to set up the forwarding mapping table of station address, key address, bridge port and Operator Specific Service example, and carries out message and transmit.
12, Ethernet system as claimed in claim 10, it is characterized in that, described Provider Edge bridge also comprises at least one operator's VLAN bridging component, wherein, described operator VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described operator VLAN bridging component.
13, Ethernet system as claimed in claim 10, it is characterized in that, described Provider Edge bridge also comprises at least one user's VLAN bridging component, wherein, described user's VLAN bridging component is used to provide user side interface, and described asymmetric bridging component is used to provide the network side interface and provides transparent interface in inside to described user's VLAN bridging component.
14, Ethernet system as claimed in claim 10, it is characterized in that, described Provider Edge bridge also comprises at least one operator's VLAN bridging component and at least one user's VLAN bridging component, described user's VLAN bridging component is used to provide user side interface, described asymmetric bridging component is used to provide the network side interface, and, in described bridge inside, described asymmetric bridging component is used for providing transparent interface to described operator VLAN bridging component, and described operator VLAN bridging component is used for providing transparent interface to described user's VLAN bridging component.
15, Ethernet system as claimed in claim 10, it is characterized in that, described network-side port is supported a plurality of virtual ports, the related Operator Specific Service example of each virtual port, virtual ID of each port arrangement, insertion/the deletion of supporting business example label, and support the MAC-in-MAC encapsulation/decapsulation.
16, a kind ofly provide service method, comprising at the Metro Ethernet edge:
User's bridge network is connected to the user-side port of Metro Ethernet edge bridges;
Based on the user-side port of Metro Ethernet edge bridges, set up the mapping relations table of Virtual User ID and operator service;
Metro Ethernet edge bridges recognition data message is also finished srvice instance mapping or outbound port mapping according to described mapping relations.
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