CN102739505B - Method and system for controlling virtual channel flow in data center network - Google Patents

Abstract

The invention discloses a method for controlling virtual channel flow in a data center network. The information for a bridge to control the flow of a virtual channel S-Channel between the bridge and a site is set. The method comprises the step that the bridge sends the information to the site to realize the control over the flow of more than one S-Channels between the site and the bridge. The invention further discloses a system for controlling the virtual channel flow in the data center network, wherein the system is for realizing the above method and comprises the site, the bridge and a setting unit. More than one S-Channels are between the site and the bridge. The setting unit is for setting the information for the bridge to control the flow of the virtual channel S-Channel between the bridge and the site. The bridge is for sending the information to the site to realize the control over the flow of more than one S-Channels between the site and the bridge. The technical scheme provided by the invention makes relatively small changes to the existing protocols, can be realized through corresponding software configuration, and has low realization cost.

Description

Flow control methods and system to tunnel in data center network

Technical field

The present invention relates to the tunnel flow control technique in virtual server system, more particularly, to a kind of data center Flow control methods and system to tunnel in network.

Background technology

With the maturation of server virtualization technology, data center deployment virtualized server data gets more and more.Virtual The appearance of machine makes data center server network access layer occur in that virtual ether bridge (VEB, Virtual Ethernet Bridge).That VEB is usually realized using Software-only method on the server it is simply that usually said virtual switch (vSwitch, Virtual Switch).VSwitch is ripe at present and the preferable technical scheme of commercialization.

Although the server virtualization of data center can greatly improve resource utilization and motility, it also brings New management and design challenge, often misleading place is network boundary (or network access layer), by handing in physical network Change planes offer network service, and also have virtual switch vSwitch in virtual world, or be called VEB, it is different virtual machine Between communication provide data exchange service.

Although the implementation of vSwitch is simple, compatibility very well, is also faced with problems.For example vSwitch accounts for The virtual machine performance that led to cpu resource declines, the traffic policing of virtual machine, the network strategy of virtual machine implement and The problems such as vSwitch management extensibility.

Another problem is, vSwitch really will manage and configure is the network traffics flowing into server, for one The technical ability that server administrators need to be grasped is to install with configuration server main frame it is not necessary to grasp data center network or common IP network communicating knowledge.Therefore with the explosive growth of virtual machine quantity in data center, serious problem of management can be caused.

In data center bridging (DCB, the Data Center Bridging) task groups of IEEE802.1 working group Formulate IEEE 802.1Qbg standard, the standards define virtual ethernet trunking device (VEPA, Virtual Ethernet Port Aggregator) technology, and multichannel (Multichannel) technology, it is referred to as edge virtual bridged (EVB, Edge Virtual Bridging) technology it is intended to by a large amount of strategy and safety and void from network interface card for the managerial processing method Unload down above plan machine and blade server, and it is held by the physics ethernet switch connecting storage and computing resource again Carry, simplify the management of data center systems, help network manager and system manager to be more advantageously managed work.

In EVB environment, a NIC (NIC, Network Interface Card) can correspond to multiple void The vNIC (Virtual NIC) intending, each vNIC can the bridge independently and in EVB be communicated, and the plurality of vNIC shares one Link.By VEPA, it is possible to achieve the data of the multiple websites (VM, Virtual Machine) on a physical terminal website It is multiplexed, and is transferred in network and is forwarded, this mode is strengthened the monitoring management to point of termination station for the network.Fictitious line Acies mouth polymerizer (VEPA, Virtual Edge Port Aggregator) is the simple extension to VEB, and its main distinction is joined Examine Fig. 1.Fig. 1 is the tunnel schematic diagram of VEB and VEPA in server, as shown in figure 1, in order to support VEPA, also requiring adjacent Connect bridge supporting reflex relaying, that is, support a kind of hairpin pass-through mode.Here the adjacent bridge that server is connected also therefore is referred to as For control bridge (i.e. bridge).

In addition, being the function of realizing VEB, VEPA and the mixing of direct-connected hubbed mode in same physical server, in NIC Several tunnels, also referred to as S-channel are set up and the interface of switch between.Fig. 2 is base in multichannel technology In the schematic diagram of tunnel communication, as shown in Fig. 2 multichannel technology make use of the port mapping S group in 802.1Qbc standard Part (PMSC, Port Mapping S-Component), the flow of different VEB, VEPA etc. is enclosed different service label (S- TAG, Service Tag), relay to adjacent bridge.The idiographic flow of this technology specifically includes following steps：

The message of inflow is forwarded in the up-link of VEPA and S-component (uplink) for step 1, VEPA.

S-Component on step 2, website is on F port for S-VID (F) in message interpolation.

S-Component on step 3, bridge receives message on the F of port and peels off S-VID, then forwards.

Step 4, message are forwarded to the port D on the S-component on bridge, add upper S-VID (D) for this message.

S-component on step 5, website identifies (S-VID) according to S-channel and forwards, and peels off on the D of port S-VID and obtain message.

As shown in Figure 2, multichannel technology is to be reached in Same Physical by adding different S-VID to different flows Realize multichannel on link, isolate flow, and enable certain ports-Extending effect, each passage therefore here is also referred to as For S-Channel.

Here the S-VID on website is to find configuration protocol (CDCP, S-Channel by adjacent bridge by S-Channel Discovery and Configuration Protocol) come to distribute, that is, the PMSC between website and adjacent bridge is agreement CDCP is needed to interact.Website asks S-channel by CDCP.CDCP pass through Link Layer Discovery Protocol (LLDP, Link Layer Discovery Protocol) TLV establishment and deletion to realize S-channel for the exchange.CDCP is used The address of LLDP data base adopt Nearest non-TPMR (Two Port MAC Relay, two-port MAC relay) bridge ground Location.Start when the system is initiated to exchange, this configuration protocol slave site starts, send one first to bridge application S- The request of channel resource.Bridge can respond this request, provides one group of S-VLAN that this bridge can be provided by.It is also possible to bridge not have Enough resources are had to meet all S-channel of request, then bridge can provide a subset S-VLAN asked, that is, full The request that foot divides.After initialization, website may change the S-channel configuration of itself, and bridge asks to find by CDCP After S-channel changes, also can change the needs to meet website for the configuration of itself.

CDCP is to find to configure S-channel by way of website and bridge mutually declare respective ability.Fig. 3 is The flow chart of the communication based on CDCP agreement, as shown in figure 3, specifically include following steps based on the communication of CDCP agreement：

Step (1), after initialization, bridge can wait a request being derived from website；

Step (2), after bridge receives from the request of website, bridge can configure to itself, and responds joining of coupling Put to website；

Step (3), website is operated using the configuration that bridge provides.

Fig. 4 is the TLV form schematic diagram of existing CDCP, as shown in figure 4, the LLDP TLV form for CDCP agreement includes Parameter make detailed description below：

OUI is mark EVB agreement (EVB, CDCP, Edge position control agreement (ECP, Edge Control Protocol), VSI Find configuration protocol (VDP, VSI Discovery and Configuration Protocol)) type, and CDCP's is concrete Value does not also set at present, is undetermined；

Subtype=0x0001, mark is CDCP TLV；

Role position：2 bits；

S(01)：Represent sender's assignment channel number, and ask neighbours " B " distribution S-VID；

B(10)：Represent that sender accepts the S-channel configuring request from neighbours " S ", and sender can give " S " Distribution S-VID as possible；

Version：2 bits.10 marks are this versions, and 00 expression does not use S-channel；

Res1：16 bits.0 must be set to, ignore this field in recipient；

ChnCap：The quantity of the S-channel that mark sender can be supported by；

SCID/S-VID pair, wherein：SCID：Represent the call number of S-channel.The S-channel index of website distribution Number scope is 0-167 (i.e. maximum support 167 S-channel).0 is to retain.S-channel call number can be from 1 to this The numerical value of most S-channel that port is supported.S-VID：It is to the VLAN ID (VLAN of S-channel distribution ID, Virtual Local Area Network Identifier).The S-VID that bridge distributes to S-channel is from 1-0xffe model Enclose interior value.Website S-VID=0 represents the request needing bridge to distribute S-VID.

But need in many cases the flow from different VEB, VEPA is controlled, if this purpose will be reached, enter Its control strategy of row can only be configured at present on the server.With the rapid growth of data center's scale, the control on network Tubulation reason wishes to realize same configuration management by control bridge, by this control bridge, website inner port is mapped on S assembly The port connecting VEB/VEPA carries out parameter setting, to realize the control to VEB/VEPA flow, and S-Channel is joined Put.Regrettably, related protocol or technical scheme is not yet had to be related in this at present.

Content of the invention

In view of this, present invention is primarily targeted at providing the flow control to tunnel in a kind of data center network Method and system processed, can realize configuration to website tunnel by the bridge of setting in virtual switch, thus realizing bridge and station Communication between point and flow-control.

For reaching above-mentioned purpose, the technical scheme is that and be achieved in that：

Flow control methods to tunnel in a kind of data center network, including：

Bridge interacts flow control information with website, realizes the control to the tunnel flow between described website and described bridge System.

Preferably, described tunnel is the S-channel being identified by virtual lane identification S-VID.

Preferably, the described control to the tunnel flow between described website and described bridge, be：

Determine the corresponding flow control parameter of described tunnel for described tunnel.

Preferably, described flow control parameter is included in described bridge as described information to send to the message of described website In.

Preferably, it is included in message flow control parameter to deposit in TLV mode.

Preferably, methods described also includes：

Described website carries out flow-control configuration according to described flow control parameter to institute's tunnel.

Preferably, described flow-control configuration is carried out to the S-Channel being distributed, be：

To the CAP port corresponding with tunnel on the port mapping S assembly of the described website connecting with tunnel Carry out flow-control configuration.

Preferably, described bridge carries out at least one of following parameter in the information of flow-control to S-channel：

Priority code selects PCS parameter, priority to control PFC ginseng to flow grade mapping PTC table, priority class traffic Count, transmission selection algorithm TSA table, extension transmission selection ETS bandwidth table, priority are lived again and organized PRG table and priority and abandon level PD table.

Preferably, described flow control parameter is certain one or more tunnel for described website, and that is, they are Corresponding with S-channel；

Flow control parameter is corresponding with mark S-VID of S-channel.

Flow control system to tunnel in a kind of data center network, including website, bridge；Wherein,

Bridge, for being interacted flow control information with website, is realized to the tunnel stream between described website and described bridge The control of amount.

Preferably, tunnel is the S-channel being identified by S-VID.

Preferably, described bridge is further used for, and is that described tunnel determines the corresponding flow-control of described tunnel Parameter, and described flow control parameter is included in described bridge as described information sends to the message of described website；Wherein, Described message is deposited in field TLV mode.

Preferably, described website is further used for, and carries out flow control according to described flow control parameter to institute's tunnel System configuration.

Preferably, described website is further used for, the port mapping S assembly to the described website being connected with S-Channel On CAP port corresponding with S-Channel carry out flow-control configuration.

Preferably, described bridge carries out to website comprising what described bridge distributed for S-Channel in the information of flow-control VLAN ID；

Or, described bridge carries out comprising the VLAN that described bridge distributes for S-Channel in the information of flow-control to website ID and flow control parameter；

Or, described bridge carries out comprising the VLAN that described bridge distributes for S-Channel in the information of flow-control to website At least one of ID and following parameter：

PCS parameter, PTC table, PFC parameter, TSA table, ETS bandwidth table, PRG table and PD table.

In the present invention, by improving to existing communication protocol such as CDCP, ECP, VDP etc., send to website in bridge Packet in set up the TLV flow of website being controlled for bridge, receive website S-Channel apply for please After asking, while being website distribution S-Channel, further the flow control parameter determining for each S-Channel is carried on In described TLV and notify to website, website according to the flow control parameter in the described TLV being received, between bridge and website S-Channel carry out corresponding flow-control configuration, thus realizing flow control to tunnels many in data center network System.Technical scheme, the change to existing protocol is less, be can achieve by corresponding software arrangements, cost of implementation Relatively low.

Brief description

Fig. 1 is the tunnel schematic diagram of VEB and VEPA in server；

Fig. 2 is the schematic diagram in multichannel technology based on tunnel communication；

Fig. 3 is the flow chart of the communication based on CDCP；

Fig. 4 is the TLV form schematic diagram of existing CDCP；

Fig. 5 is the CDCP TLV form schematic diagram of the embodiment of the present invention one；

Fig. 6 be the embodiment of the present invention one data center network in flow chart to the flow control methods of tunnel；

Fig. 7 is the CDCP TLV form schematic diagram of the embodiment of the present invention two；

Fig. 8 is the CDCP TLV form schematic diagram of the embodiment of the present invention three；

Fig. 9 is EVB TLV form schematic diagram of the present invention；

Figure 10 is the EVB TLV form schematic diagram of the embodiment of the present invention four.

Specific embodiment

For making the object, technical solutions and advantages of the present invention become more apparent, by the following examples and referring to the drawings, right The present invention further describes.

Embodiment one

The present embodiment is applied to the relatively simple situation of flow-control of many tunnels, only relates to be to S-Channel Bandwidth set.In the present embodiment, set up the information that bridge carries out flow-control to website first, and send to website in bridge Packet in set up field TLV for carrying the described information that website is carried out with flow-control, this is generated by bridge TLV, and it is sent to website.Here, TLV field need to appoint form between bridge and website in advance, and that is, the form of TLV all can quilt Bridge and station recognition, so, after website receives the TLV being used for flow-control accordingly, you can realize between bridge and website The flow-control configuration of S-Channel.It will be appreciated by those skilled in the art that corresponding agreement being set up with TLV and holding in this TLV The information that load bridge carries out flow-control to website is easy realization.

Fig. 5 is the CDCP TLV form schematic diagram of the embodiment of the present invention one, as shown in figure 5, below to for S- The parameter included by TLV field of Channel flow set is described in detail：

Mode：Represent the type of the primary information field SCID/S-VID/ChPara entrained by current TLV.This field Value is as shown in table 1 with the relation of SCID/S-VID/ChPara field format：

Mode	SCID/S-VID/ChPara form
		00	SCID
01	SCID/S-VID

10	S CID/S-VID/ChPara
		11	Reserved

Table 1

SCID form：SCID/S-VID/ChPara field only contains the value of SCID, is generally used for site requests S-VID Distribution.That is, when website be used for bridge application S-Channel when, only comprise the SCID value of itself, will currently itself The information (SCID) of the virtual port supported notifies to bridge, and bridge can determine the current virtual terminal supported of website according to SCID value Mouth quantity and its corresponding mark.

SCID/S-VID form：SCID/S-VID/ChPara field contains SCID and S-VID pair, is generally used for bridge and rings Answer the request of website, distribute S-VID to corresponding S-Channel.SCID and S-VID pair, mainly apllied for website by bridge S-Channel distributes corresponding S-VID, to form the S-Channel between bridge and website.

SCID/S-VID/ChPara form：SCID/S-VID/ChPara field contains SCID and S-VID pair, Yi Jiqi The parameter setting of corresponding S-channel, is generally used for the request that bridge responds website, distributes S- to corresponding S-Channel VID, and indicate that the due correlative flow control of this S-Channel corresponding CAP port is configured.Here ChPara can To be the bandwidth shared by the absolute bandwidth (i.e. specific bandwidth value) of the S-Channel specifying or each S-Channel Percentage ratio.

In conjunction with the TLV shown in upper table 1, the specific implementation of the present embodiment is described in detail.

It is assumed that website (server) needs to apply for 3 S-Channel, its port mapping S assembly has 3 in the present embodiment Port has been respectively connected to VEB/VEPA.Fig. 6 is the flow control to tunnel in the data center network of the embodiment of the present invention one The flow chart of method processed, as shown in fig. 6, in carrying out the distribution of S-Channel and the assigning process of flow control parameter, specifically Comprise the following steps：

Step 1), website sends CDCP protocol massages to switch, notifies its S-Channel port number of being supported of bridge to be Article 5, be currently application SCID=1,2,3 S-VID (now Mode=00, only comprises SCID in message, be SCID application S- The request of VID)；

Step 2), after bridge joint receives the protocol massages of application S-VID of CDCP, it is each SCID distribution S-VID and correspondence Flow bandwidth percentage ratio, i.e. the PVID configuration S-VID to each S-Channel corresponding CAP port of port mapping S assembly； Specifically, after bridge determines specific S-VID and corresponding flow for SCID, it is encapsulated in aforesaid TLV that (concrete form is such as " 10 " corresponding item shown in table 1), and it is sent to website.Website, according to the TLV being received, is carried out accordingly to S-Channel Configuration.Specifically, website be port mapping S assembly SCID corresponding CAP port configure S-VID, so, that is, with bridge on Form S-Channel between the port of corresponding S-VID mark, that is, achieve the foundation of tunnel.And, by acquired This S-Channel flow control parameter, corresponding flow is arranged to the SCID corresponding CAP port of port mapping S assembly Control parameter, thus realize the flow-control to S-Channel.

In the present embodiment, flow parameter can be absolute bandwidth value or the percentage amounts of certain bandwidth benchmark.

Embodiment two

The strategy that this embodiment is applied to flow-control is complex, can carry the flow-control of multiple S-Channel Parameter.For example, flow-control field TLV of a new S-Channel is set.Fig. 7 is the CDCP of the embodiment of the present invention two TLV form schematic diagram, as shown in fig. 7, the parameter included by the following CDCPTLV field to embodiment two is described in detail：

Priority field：Default priority parameter.

Priority code selects (PCS, Priority Code Point Selection) field：Precedence level code (PCP, Priority Code Point).

Priority maps (PTC, Priority to Traffic Class) table to flow grade：Represent this port from excellent First level Priority is to the mapping relations of flow grade Traffic Class.

Priority class traffic controls (PFC, Priority Flow Control) to enable：Each priority corresponds to a bit (the 8th corresponding priority 7, the 1st corresponding priority 0).The value 1 of each represents that this corresponding priority enables PFC, 0 this corresponding priority of expression does not enable PFC.

Transmission selection algorithm (TSA, Transmission Selection Algorithm) table：One comprises 8 list items Form, one byte of each list item, identify the transmission selection algorithm of its corresponding discharge grade.

Extension transmission selects (ETS, Extended Transmission Selection) bandwidth table：One 8 list item Table, one byte of each list item.Each list item contains the bandwidth of the flow grade distribution employing ETS algorithm to its correspondence.

Priority is lived again group (PRG, Priority Regeneration Group) table：This port correspondence from priority 7 to The form regenerating priority of priority 0.

Priority and discarding level (PD, Priority and Drop) table：16 bytes, represent in PCP decoding table respectively The priority 7 of this string of 8P0D, 7P1D, 6P2D, 5P3D arrives the list item of priority 0.

The workflow of embodiment two is similar with the workflow of embodiment one, simply, traffic policy in embodiment two Configuration is complex, needs more to be configured in corresponding CAP port, such as the configuration of default priority, PFC, ETS join Put etc..As long as it will be appreciated by those skilled in the art that the flow control policy being configured is not conflicted, can be same in theory Bar S-Channel configures all flow parameters shown in Fig. 7.Specific S-Channel configuration mode and its flow parameter Configuration mode, identical with previous embodiment one, this example repeats no more it and realizes details.

Embodiment three

The present embodiment is suitable for the traffic policy of each S-Channel configuration, and the stream that each S-Channel is configured Amount control strategy not necessarily identical situation.Specifically, by each flow control parameter shown in the TLV field shown in Fig. 7 At least one, distribute to website apllied difference S-Channel, the apllied S-Channel of website flow-control ginseng Number can be entirely different, to facilitate the flow-control that different S-Channel is carried out with differentiation.That is, different S- The traffic policy of Channel is divided into multiple different types of TLV, facilitates the selection of different S-Channel, and Fig. 8 is the present invention The CDCPTLV form schematic diagram of embodiment three, as shown in figure 8, being the situation of different TLV corresponding to different S-Channel, needs Illustrate, the implication of each field of in figure is identical with the corresponding field implication in embodiment two, and, be directed to every S- Channel, the flow control parameter included in corresponding TLV field can also be more than one, as long as that is, shown in Fig. 7 Each flow parameter between not do not conflict, you can be carried in the TLV field of a S-Channel, that is, can in a TLV field To comprise more than one flow control parameter.

The workflow of the present embodiment is similar with the implementation of above-described embodiment one, and institute's difference is, bridge is generating S- During the flow-control TLV field of Channel, for the traffic policy of each S-Channel, the flow-control TLV shown in Fig. 8 Field carries out selecting.

Example IV

The workflow of the present embodiment is similar with the workflow of the above embodiments one, except that, flowed The port of amount control parameter configuration is different from aforementioned port.The IT policy that the present embodiment is relayed using a kind of bridge to edge To carry flow control parameters information, such as to be realized using EDCP agreement, this agreement is also based on LLDP, but on the basis of LLDP Extend an EVB TLV, its form is as shown in Figure 9.Fig. 9 is EVB TLV form schematic diagram of the present invention, as shown in figure 9, due to Shown mutual message is for each edge relaying, therefore corresponds to the friendship that each S-Channel has an EVB TLV Mutually.Therefore in example IV, the stream control field newly increasing need not specify corresponding No. S-Channel.Therefore this stream control field Can be any one the TLV field shown in Figure 10, Fig. 7 and Fig. 8.

Edge relay reception to carrying after the TLV field of flow control parameter, join by the relevant parameter being flowed in control field Put on the port being connected with port mapping S assembly of this edge relaying, the exit port enforcement flow of this port is flowed Amount controls, thus controlling the flow entering S-Channel.

Technical scheme is not limited only for the extension to LLDP agreement, can also be for ECP agreement And similar other agreements of application scenarios are extended, the implementation all fours of the mode of realization and previous embodiment, The present invention repeats no more it and realizes details.

The present invention has also stated that the flow control system in data center network to tunnel, including website, bridge and Arranging unit；It is in existing virtual data center to the flow control system of tunnel in the data center network of the present invention To the S-Channel between the bridge of setting and its flow-control configuration side in website and virtual switch on the basis of original structure Formula improves, and remaining hardware and its annexation do not have any change.Specifically, it is also provided with the field for flow control The arranging unit of TLV setting, for being extended to the field of existing agreement.

Specifically, in the data center network of the present invention, the flow control system of tunnel is included：

Arranging unit, carries out the information of flow-control for setting up bridge to website；

Described bridge realizes the configuration of the flow-control to described website by sending described information to described website.

Above-mentioned arranging unit is further used for, and sets up for carrying in described bridge sends to the packet of described website State the TLV of the information that website is carried out with flow-control；

Described bridge, further after receiving the S-Channel application request that described website sends, is described website distribution S-Channel, and determine flow control parameter for described website, sending the described TLV setting up to the packet of described website The described flow control parameter of middle encapsulation, and it is sent to described website；

Described website is carried out to the S-Channel being distributed according to the described flow control parameter in described TLV further Flow-control configures.

Above-mentioned website is further used for, on the port mapping S assembly of the described website being connected with S-Channel and S- Channel corresponding CAP port carries out flow-control configuration.

Above-mentioned bridge carries out to website comprising the VLAN ID that described bridge distributes for S-Channel in the information of flow-control；

Or, described bridge carries out comprising the VLAN that described bridge distributes for S-Channel in the information of flow-control to website ID and flow control parameter；

Or, described bridge carries out comprising the VLAN that described bridge distributes for S-Channel in the information of flow-control to website At least one of ID and following parameter：

Priority parameters, PCS parameter, PTC table, PFC parameter, TSA table, ETS bandwidth table, PRG table and PD table.

In the data center network of the present invention, the concrete structure to the flow control system of tunnel, can be found in existing skill The structure of the data center network in art and understand, as can be found in structure shown in aforesaid Fig. 2 etc..

The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.

Claims (13)

1. in a kind of data center network to the flow control methods of tunnel it is characterised in that methods described includes：

Bridge interacts flow control information with website, realizes the control to the tunnel flow between described website and described bridge； Wherein, described tunnel is the S-channel being identified by virtual lane identification S-VID.

2. method according to claim 1 it is characterised in that described to the tunnel between described website and described bridge The control of flow, be：

Determine the corresponding flow control parameter of described tunnel for described tunnel.

3. method according to claim 2 it is characterised in that be included in described flow control parameter as described information Described bridge sends to the message of described website.

4. method according to claim 3 is it is characterised in that be included in message flow control parameter in field TLV mode Deposit.

5. method according to claim 2 is it is characterised in that methods described also includes：

Described website carries out flow-control configuration according to described flow control parameter to institute's tunnel.

6. method according to claim 5 is it is characterised in that described carry out flow-control to the S-Channel being distributed Configuration, be：

CAP port corresponding with tunnel on the port mapping S assembly of the described website being connected with tunnel is carried out Flow-control configures.

7. method according to claim 1 is it is characterised in that described bridge carries out the information of flow-control to S-channel In following parameter at least one：

Priority code selects PCS parameter, priority to control PFC parameter, biography to flow grade mapping PTC table, priority class traffic Defeated selection algorithm TSA table, extension transmission selection ETS bandwidth table, priority are lived again and are organized PRG table and priority and abandon level PD table.

8. the method according to any one of claim 1 to 7 is it is characterised in that described flow control parameter is for described Certain of website one or more tunnel, that is, they are corresponding with S-channel；

Flow control parameter is corresponding with mark S-VID of S-channel.

9. the flow control system to tunnel in a kind of data center network, including website, bridge；It is characterized in that：

Bridge, for being interacted flow control information with website, is realized to the tunnel flow between described website and described bridge Control；Wherein, described tunnel is the S-channel being identified by S-VID.

10. system according to claim 9, it is characterised in that described bridge is further used for, is that described tunnel determines The corresponding flow control parameter of described tunnel, and described flow control parameter is included in described bridge as described information sends out Deliver in the message of described website；Wherein, deposited in field TLV mode in described message.

11. systems according to claim 10 it is characterised in that described website is further used for, according to described flow control Parameter processed carries out flow-control configuration to institute's tunnel.

12. systems according to claim 10, it is characterised in that described website is further used for, connect to S-Channel CAP port corresponding with S-Channel on the port mapping S assembly of the described website connecing carries out flow-control configuration.

13. systems according to any one of claim 9 to 12 are it is characterised in that described bridge carries out flow-control to website Information in comprise the VLAN ID that described bridge distributes for S-Channel；

Or, described bridge website is carried out comprise in the information of flow-control VLAN ID that described bridge distributes for S-Channel with And flow control parameter；

Or, described bridge website is carried out comprise in the information of flow-control VLAN ID that described bridge distributes for S-Channel with And at least one of following parameter：

PCS parameter, PTC table, PFC parameter, TSA table, ETS bandwidth table, PRG table and PD table.