CN105634942A - Method and switch for forwarding message - Google Patents
Method and switch for forwarding message Download PDFInfo
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- CN105634942A CN105634942A CN201410606795.0A CN201410606795A CN105634942A CN 105634942 A CN105634942 A CN 105634942A CN 201410606795 A CN201410606795 A CN 201410606795A CN 105634942 A CN105634942 A CN 105634942A
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Abstract
The invention provides a method and a switch for forwarding a message. The method for forwarding the message comprises the steps that: a first node obtains the message; the first node determines a forwarding path of the message when the message needs to be forwarded through a prescribed path; the first node determines at least one output interface according to the forwarding path; and the first node forwards the message to a second node through one of the at least one output interface. According to the embodiments of the invention, when the message is determined to be forwarded through the prescribed path, the forwarding path of the message is determined, the output interface is determined according to the forwarding path, and then the message is forwarded through the output interface, so that message forwarding through the prescribed path is realized in DCN Fabric.
Description
Technical field
The present invention relates to the communications field, particularly relate to the method and switch that E-Packet.
Background technology
At present, data center network is (English: DateCenterNetwork, abbreviation: DCN) mainly use flattening, choke free networking mode to build DCNFabric, in DCNFabric, each leaf (leaf) switch can be transferred through backbone (spine) switch and is connected to other leaf switch. In order to tackle the demand of cloud computing, data center virtualization, data center network needs to support many tenants, and requires that each tenant can only access the privately-owned network of oneself, it is impossible to access the network of other tenants. Virtual expansible LAN is (English: VirtualExtensibleLocalAreaNetwork, abbreviation: VXLAN) technology is that internet engineering task group is (English: InternetEngineeringTaskForce, abbreviation: IETF) a kind of technology proposed, distinguishes the flow of different tenant by defining new VXLAN heading (header).
When DCNFabric adopts VXLAN technology, VXLAN tunneling termination node is (English: VXLANTunnelEndPoint, VTEP) can learn and safeguard that all virtual machines being connected to described VTEP are (English: virtualmachine, abbreviation: VM) medium access control is (English: MediumAccessControl, abbreviation: MAC) address or Internet protocol are (English: InternetProtocol, abbreviation: IP) address, generate the binding relationship of the VTEPIP (i.e. the IP address of described VTEP) the IP address with described virtual machine or MAC Address, and spread in described DCNFabric, so, each VTEP can both get the MAC Address of the overall connected virtual machine of each VTEP or the binding relationship of IP address. wherein, the function of VTEP is realized by the leaf switch in DCNFabric. after data message enters VXLAN network edge, VTEP can search the VTEPIP corresponding to the target MAC (Media Access Control) address of described data message or purpose IP address, and described data message is packaged into VXLAN message as outer layer purpose IP address by the VTEPIP found, (English: EqualCostMultiplePath, abridges: ECMP) forward based on the outer layer IP address of described VXLAN message, described VXLAN message to be performed equal cost multipath between VTEP. backbone switch in DCNFabric directly forwards described VXLAN message according to the outer layer IP address of described VXLAN message.
That is, when DCNFabric uses VXLAN as service bearer technology, the destination address that leaf switch and spine switch are all based on directly in the outer layer IP head of VXLAN message realizes ECMP and forwards, it is impossible to the specified path realizing message in DCNFabric forwards.
Summary of the invention
The invention provides a kind of method E-Packeted and switch, it is possible to the specified path realizing the message in DCNFabric forwards.
First aspect, it is provided that a kind of method E-Packeted, described method is applied to support that in the data center network DCNFabric of virtual expansible LAN VXLAN technology, described method includes: primary nodal point obtains message; When described message requires over specified path forwarding, described primary nodal point determines the forward-path of described message; Described primary nodal point determines at least one outgoing interface according to described forward-path; Described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point.
In conjunction with first aspect, in the implementation that the first is possible, described message is the VXLAN message after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path, and described specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path; After described primary nodal point obtains described VXLAN message, described method also includes: described primary nodal point forwards flag bit to determine that described VXLAN message forwards the need of by specified path according to described specified path; Wherein, described primary nodal point determines that the forward-path of described message includes: described primary nodal point determines the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets.
In conjunction with first aspect, in the implementation that the second is possible, described message is original message, and described primary nodal point obtains message and includes: described primary nodal point receives the VM described original message sent; Described method also includes: described primary nodal point obtains match index according to described original message; Described primary nodal point searches matching list according to described match index, and described matching list is used to determine whether to need described original message is carried out specified path forwarding; When there is the list item including described match index in described matching list, described primary nodal point determines that described original message requires over specified path and forwards; Wherein, described primary nodal point determines that the forward-path of described message includes: described primary nodal point determines the forward-path of described original message according to described match index; Described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point, including: described original message is carried out VXLAN encapsulation by described primary nodal point, obtaining VXLAN message, the outer layer IP head of described VXLAN message includes specified path and forwards enable position and ID of trace route path; Described VXLAN message is forwarded to described secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point.
In conjunction with the implementation that the second is possible, match index described in the implementation that the third is possible includes at least one in the access physical port of described original message, the virtual LAN VLAN mark of described original message or the five-tuple information of described message.
In conjunction with the first or the second or the third possible implementation, in the 4th kind of possible implementation, described specified path forwards flag bit and shown ID of trace route path to carry in the reserved marker bit in described outer layer IP head Type Of Service TOS field.
In conjunction with first aspect or the first is to any one the possible implementation in the 4th kind of possible implementation, in the 5th kind of possible implementation, when described primary nodal point determines multiple outgoing interface according to described forward-path, described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described and specifically includes by described primary nodal point: described primary nodal point adopts equal cost multipath ECMP mode, by an outgoing interface in the plurality of outgoing interface, described message is forwarded to described secondary nodal point.
Second aspect, it is provided that a kind of switch, described application is in the data center network DCNFabric supporting virtual extended local network VXLAN technology, and described switch includes: acquisition module, is used for obtaining message; Determine module, be used for: when described message requires over specified path forwarding, it is determined that the forward-path of described message, and determine at least one outgoing interface according to described forward-path; Forwarding module, for being forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described message.
In conjunction with second aspect, in the first possible implementation of second aspect, described message is the VXLAN message after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path, and described specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path; Described determine module specifically for: obtain after described message at described acquisition module, flag bit is forwarded to determine that described VXLAN message forwards the need of by specified path according to described specified path, when described VXLAN message require over specified path forward time, determine the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets.
In conjunction with second aspect, in the implementation that the second of second aspect is possible, described message is original message, and described acquisition module is specifically for the sink virtual machine VM described original message sent; Described acquisition module is additionally operable to obtain match index according to described original message; Described switch also includes: search module, and for searching matching list according to described match index, wherein said matching list is used to determine whether to need described original message is carried out specified path forwarding; Described determine module specifically for: when described matching list exists include the list item of described match index time, it is determined that described original message requires over specified path and forwards, and determines the forward-path of described original message according to described match index; Described forwarding module specifically for: described original message being carried out VXLAN encapsulation, obtains VXLAN message, the outer layer IP head of described VXLAN message includes specified path and forwards and enable position and ID of trace route path; By an outgoing interface at least one outgoing interface described, described VXLAN message is forwarded to described secondary nodal point.
In conjunction with the implementation that the second of second aspect is possible, in the third possible implementation of second aspect,, described match index includes at least one in the access physical port of described original message, the virtual LAN VLAN mark of described original message or the five-tuple information of described message.
The first or the second or the third possible implementation in conjunction with second aspect, in the 4th kind of possible implementation of second aspect, described specified path forwards flag bit and described ID of trace route path to carry in the reserved marker bit in described outer layer IP head Type Of Service TOS field.
In conjunction with the first of second aspect or second aspect to any one the possible implementation in the 4th kind of possible implementation, in the 5th kind of possible implementation of second aspect, described forwarding module specifically for when described determine that module determines multiple outgoing interface according to forward-path time, adopt ECMP mode by an outgoing interface in the plurality of outgoing interface, described message is forwarded to described secondary nodal point.
Technique scheme of the present invention, by when determining that message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing the message in DCNFabric forwards.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, the accompanying drawing used required in the embodiment of the present invention will be briefly described below, apparently, drawings described below is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the indicative flowchart of the method E-Packeted according to embodiments of the present invention.
Fig. 2 is the indicative flowchart of the method E-Packeted according to another embodiment of the present invention.
Fig. 3 is the schematic diagram of VXLAN packet outer layer IP head type of service field according to embodiments of the present invention.
Fig. 4 is the schematic architectural diagram of the application scenarios of the method E-Packeted according to embodiments of the present invention.
Fig. 5 is the schematic block diagram of switch according to embodiments of the present invention.
Fig. 6 is the schematic block diagram of switch according to another embodiment of the present invention.
Fig. 7 is the schematic block diagram of switch according to another embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiment. Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under the premise not making creative work, all should belong to the scope of protection of the invention.
Fig. 1 is the indicative flowchart of the method 100 E-Packeted according to embodiments of the present invention. Method 100 is applied in the DNCFabric of support VXLAN technology. As it is shown in figure 1, method 100 may include steps of.
110, primary nodal point obtains message.
Described primary nodal point can be the leaf switch in DNCFabric or spine switch. Primary nodal point can directly receive the virtual machine VM original message sent, it is also possible to receives the VXLAN message after the encapsulation outer layer head that other nodes send.
120, when described message requires over specified path forwarding, described primary nodal point determines the forward-path of this message.
Described forward-path can (English: PortGroup, be called for short: PG) represent by port set. Different physical ports on one equipment can be tied to same PG, and the different physical ports on same equipment can also be tied to different PG. By on configuration physical port on different leaf, spine switches to identical PG, it is possible to specified path end to end inside planning VXLANFabric in advance. Now, described ID of trace route path is used for indicating PG, can include a plurality of forward-path in a PG of ID of trace route path instruction.
130, described primary nodal point determines at least one outgoing interface according to described forward-path.
When described forward-path is represented by PG, it is assured that described PG at least one outgoing interface bound according to described PG.
140, described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point.
The secondary nodal point that the different outgoing interfaces of described primary nodal point are corresponding different, different messages can be forwarded to different secondary nodal points by different outgoing interfaces by primary nodal point, it is possible to realize the load balancing between different secondary nodal points. This secondary nodal point is the node having annexation in network with primary nodal point.
In the embodiment of the present invention, when message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing the message in DCNFabric forwards.
It should be noted that in embodiments of the present invention, when determining that message need not be forwarded by specified path, directly adopt ECMP technology to forward according to purpose IP address in outer layer IP head this message.
In an alternative embodiment of the invention, when primary nodal point in step 130 is when determining multiple outgoing interface according to forward-path, then in step 140, described primary nodal point adopts the mode of ECMP to select one in the plurality of outgoing interface described message is forwarded to described secondary nodal point.
Specifically, in an embodiment of the invention, when the VXLAN message that described message is after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path. Described specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path. In a detailed description of the invention, when the value that described specified path forwards flag bit is 1, represent that described VXLAN message requires over specified path and forwards. Described ID of trace route path is used for indicating path.
As in figure 2 it is shown, described step 120 specifically may include that 121, forwards flag bit to determine that described VXLAN message forwards the need of by specified path according to the specified path of described VXLAN message; 122, when described VXLAN message require over specified path forward time, determine the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets. Wherein, described forward table includes multiple forwarding-table item, and wherein each forwarding-table item includes the corresponding relation of ID of trace route path and forward-path. Described step 121 and 122 can be performed by leaf switch or spine switch.
Alternatively, in an alternative embodiment of the invention, when described primary nodal point is leaf switch, and when described message is original message, described step 110 specifically includes: the original message that described primary nodal point sink virtual machine VM sends. Described method 100 also includes: described primary nodal point obtains match index according to described original message; Searching matching list according to described match index, described matching list is used to determine whether to need described original message is carried out specified path forwarding; When there is the list item including described match index in described matching list, described primary nodal point determines that described original message requires over specified path and forwards. Correspondingly, step 120 specifically includes: described primary nodal point determines the forward-path of described original message according to described match index. Step 140 specifically includes: described original message is carried out VXLAN encapsulation by described primary nodal point, obtains VXLAN message, and the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path; Described VXLAN message is forwarded to described secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point.
Wherein, described original message is carried out VXLAN encapsulation, be specifically included in the ID of trace route path adding described forward-path in the outer layer IP head of described VXLAN message and specified path forwards flag bit. Determine the forward-path of described original message according to described match index, can be specifically search forward table according to described match index, it is determined that the forward-path of described original message.
Wherein, described matching list is used to determine whether to need described original message is carried out specified path forwarding. In one embodiment, the list item of described matching list includes match index. Described matching list exists the list item of the match index including certain original message, namely shows that described original message requires over specified path and forwards. Described forward table is used for instructing message to forward, and described forward table can include multiple forwarding-table item, and each list item of described forward table includes the corresponding relation of match index, ID of trace route path and forward-path.
Specifically, the match index of described original message can include at least one in the access physical port of described original message, the virtual LAN VLAN mark of described original message or the five-tuple information of described original message.
Wherein, the physical port that accesses of described original message refers to the physical port of the described primary nodal point described original message of reception, and at least one in the five-tuple information of described original message can be: protocol number, source IP address, source port, purpose IP address or destination interface.
It should be understood that, described match index can also include other information, correspondingly, described primary nodal point can also determine the described matching list of lookup according to other information described, and when there is, in described matching list, the list item including other information described, determine the forward-path of described original message according to described match index, according to described forward-path, described original message is encapsulated as VXLAN message.
Described match index and described forward-path can one_to_one corresponding, it is also possible to be the corresponding forward-path of multiple match index, it is also possible to be the corresponding a plurality of forward-path of a match index. In sum, the corresponding relation between described match index and described forward-path can according to service needed concrete configuration, and the embodiment of the present invention is without limitation.
In the embodiment of the present invention, network manager can be pre-configured with forward table and matching list on switches according to service needed, and when forward-path or match index change, manager can revise the configuration of forward-path or match index flexibly.
It should be noted that when forward-path is represented by port set PG, each list item of forward table includes the corresponding relation of match index, ID of trace route path and PG. Can including a plurality of forward-path in one PG of the ID of trace route path instruction that one match index is corresponding, in other words, a plurality of forward-path corresponding to same match index may belong to same PG.
It should be noted that after receiving the virtual machine VM original message sent, described original message can also be carried out VXLAN encapsulation in described step 110. After determining that described original message requires over specified path and forwards, and determining the forward-path of described original message, then specified path forwarding flag bit and ID of trace route path are set in outer layer IP head, obtain described VXLAN message.
Preferably, as it is shown on figure 3, described specified path forwards flag bit and described ID of trace route path can carry outer layer IP head COS (English: TypeofService, abbreviation: TOS) in the reserved marker bit of field at described VXLAN message. In figure, E (Enable) represents that specified path forwards flag bit, and P (Path) represents ID of trace route path. E mark value can be defaulted as 0, represents that VXLAN message need not be forwarded by specified path. Represent that when E mark value is 1 VXLAN message requires over specified path and forwards, now correspondingly P mark value represents corresponding different forward-paths respectively, such as P mark value 0 represents that the forward-path of described VXLAN message is that PG1, P mark value 1 represents that the forward-path of described VXLAN message is PG2. The embodiment of the present invention is by directly using the TOS reserved field in VXLAN outer layer IP head so that need not additionally increase message loaded length and just can specify the forward-path of message, it is possible to increase forward efficiency.
Additionally, owing in TOS field, D/T/R marker bit uses less, in DNCFabric, ID of trace route path can also be used for by multiplexing these three marker bit, such TOS field has 4 and is labeled as ID of trace route path, altogether can support 16 forward-paths, it is possible to meet the demand of more appointment forward-path planning.
In the inventive method embodiment, the size of the sequence number of each step is not meant to the priority of execution sequence, and the execution sequence of each step should be determined with its function and internal logic, and the implementation process of the embodiment of the present invention should not constituted any restriction.
Additionally, after secondary nodal point receives the VXLAN message that primary nodal point forwards, secondary nodal point directly forwards flag bit to determine the need for forwarding described VXLAN message by specified path according to the specified path of TOS field in VXLAN outer layer IP head, when E mark value is 1, forward this VXLAN message according to the forward-path of P mark value instruction. Or, directly adopt ECMP to forward this VXLAN message when E mark value is 0 according to purpose IP address in VXLAN outer layer IP head. Secondary nodal point can be leaf switch or the spine switch of the forward-path being arranged in this VXLAN message.
Below in conjunction with Fig. 4, the method 100 E-Packeted according to embodiments of the present invention is described.
Fig. 4 is the schematic architectural diagram of the application scenarios of the method 100 E-Packeted according to embodiments of the present invention. In Fig. 4, node 401��406 is leaf switch, and its interior joint 401 is entrance leaf switch, and node 411��416 is spine switch. Specified path forwarding process is described below in detail.
(1) entrance leaf switch 401 encapsulates original message: after entrance leaf switch 401 receives the VM original message sent, match index is obtained, at least one in the access physical port of this original message, the VLAN mark of this original message or the five-tuple information of this original message according to this original message. Leaf switch 401 searches matching list according to this match index, there is the list item including this match index in matching list, and leaf switch 401 determines that this original message requires over specified path and forwards. Leaf switch 401 further searches for forward table and obtains the port set that this match index is corresponding. Then this original message is carried out VXLAN encapsulation by leaf switch 401, obtains VXLAN message. In carrying out VXLAN encapsulation process, two reserved marker bit places in outer layer IP head TOS field arrange the mark value of specified path forwarding flag bit E is 1, and arranges corresponding P mark value according to this port set. If P mark value is 1, when leaf switch 401 binds an outgoing interface in this port set, by this outgoing interface, this message after encapsulation is forwarded to next spine switch 411. When leaf switch 401 binds multiple outgoing interface in this port set, adopt ECMP mode, by an outgoing interface in the plurality of outgoing interface, this VXLAN message is forwarded to spine switch 411. When P mark value is 0, as shown in Figure 4, it is forwarded to spine node 412 by corresponding outgoing interface.
(2) intermediary switch forwards: be positioned at the leaf switch in the middle of forward-path or after spine switch receives VXLAN message, check the E mark value in the outer layer IP head TOS field of this VXLAN message, E mark value be 1 show this VXLAN message require over specified path forward, leaf switch or spine switch directly according to the P mark value in outer layer IP head determine correspondence outgoing interface. Such as shown in Fig. 4, when P mark value is that 1, spine switch 511 determines, according to forward table, the outgoing interface that the port set that P mark value 1 indicates is bound. When this port set binds an outgoing interface, by this outgoing interface, described VXLAN message is forwarded to spine switch 415. When this port set binds multiple outgoing interface, adopt ECMP mode, by an outgoing interface in the plurality of outgoing interface, described VXLAN message is forwarded to spine switch 415. The execution process of other spine switches is similar with the execution process of spine switch 411, does not repeat them here.
(3) egress switch decapsulation: after outlet leaf switch (as shown in Figure 4 leaf switch 404, leaf switch 405) receives VXLAN message, directly decapsulation VXLAN outer layer head, obtain original message, this original message is forwarded on corresponding purpose VM according to original message MAC/IP head.
In the embodiment of the present invention, when message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing the message in DCNFabric forwards.
Above in association with Fig. 1 to Fig. 4, describe the method E-Packeted according to embodiments of the present invention in detail, below in conjunction with Fig. 5 to Fig. 7, detailed description switch according to embodiments of the present invention.
Fig. 5 is the schematic block diagram of switch 500 according to embodiments of the present invention. Switch 500 is applied in the data center network DCNFabric of support virtual extended local network VXLAN technology. As it is shown in figure 5, switch 500 includes: acquisition module 510, determine module 520 and forwarding module 530.
Acquisition module 510 is used for obtaining message. Determine module 520 for: when described message require over specified path forward time, it is determined that the forward-path of described message; At least one outgoing interface is determined according to described forward-path. Forwarding module 530 is for being forwarded to secondary nodal point by an outgoing interface at least one outgoing interface by described message.
Described forward-path can be represented by port set PG. Different physical ports on one equipment can be tied to same PG, and the different physical ports on same equipment can also be tied to different PG. By on configuration physical port on different leaf, spine switches to identical PG, it is possible to specified path end to end inside planning VXLANFabric in advance. Now, described ID of trace route path is used for indicating PG, can include a plurality of forward-path in a PG of ID of trace route path instruction.
Switch 500 can or leaf switch, it is also possible to be spine switch.
The switch of the embodiment of the present invention, when message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing the message in DCNFabric forwards.
In an alternative embodiment of the invention, described forwarding module 530 specifically for, described determine that module 520 determines multiple outgoing interface according to described forward-path time, adopt ECMP mode select an outgoing interface in the plurality of outgoing interface that described message is forwarded to described secondary nodal point.
In an alternative embodiment of the invention, described message is the VXLAN message after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path, and wherein said specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path. In a detailed description of the invention, when the value that described specified path forwards flag bit is 1, represent that described VXLAN message requires over specified path and forwards. Described ID of trace route path is used for indicating path.
Correspondingly, described determine module 520 specifically for, after described acquisition module 510 obtains described message, flag bit is forwarded to determine that described VXLAN message forwards the need of by specified path according to described specified path, when described VXLAN message require over specified path forward time, determine the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets.
Alternatively, in an alternative embodiment of the invention, described message is original message, and described acquisition module 510 is specifically for the sink virtual machine VM described original message sent, and described acquisition module 510 is additionally operable to obtain match index according to described original message. As shown in Figure 6, switch 500 also includes: search module 540, and for searching matching list according to described match index, wherein said matching list is used to determine whether to need described original message is carried out specified path forwarding. Correspondingly, it is determined that module 520 specifically for, when described matching list exists include the list item of described match index time, it is determined that described original message requires over specified path and forwards, and determines the forward-path of described original message according to described match index. Forwarding module 530 specifically for: described original message being carried out VXLAN encapsulation, obtains VXLAN message, the outer layer IP head of described VXLAN message includes specified path and forwards and enable position and ID of trace route path; By an outgoing interface at least one outgoing interface described, described VXLAN message is forwarded to described secondary nodal point.
Wherein, forwarding module 530 forwards flag bit specifically for the ID of trace route path and specified path adding described forward-path in the outer layer IP head of described VXLAN message. Determine that module 520 can specifically for searching forward table according to described match index, it is determined that described forward-path.
Described matching list is used to determine whether to need described original message is carried out specified path forwarding. In one embodiment, the list item of described matching list includes match index. Described matching list exists the list item of the match index including certain original message, namely shows that described original message requires over specified path and forwards. Described forward table is used for instructing message to forward, and described forward table can include multiple forwarding-table item, and each list item of described forward table includes the corresponding relation of match index, ID of trace route path and forward-path.
Specifically, the match index of described original message can include at least one in the access physical port of described original message, the virtual LAN VLAN mark of described original message or the five-tuple information of described message.
Wherein, the physical port that accesses of described original message refers to the physical port of the described primary nodal point described original message of reception, and at least one in the five-tuple information of described original message can be: protocol number, source IP address, source port, purpose IP address or destination interface.
It should be noted that when forward-path is represented by port set PG, each list item of forward table includes the corresponding relation of match index, ID of trace route path and PG. Can including a plurality of forward-path in one PG of the ID of trace route path instruction that one match index is corresponding, in other words, a plurality of forward-path corresponding to same match index may belong to same PG.
Preferably, described specified path forwards flag bit and described ID of trace route path can carry in the reserved marker bit of the outer layer IP head Type Of Service TOS field of shown VXLAN message.
Additionally, owing in TOS field, D/T/R marker bit uses less, in DNCFabric, ID of trace route path can also be used for by multiplexing these three marker bit, such TOS field has 4 and is labeled as ID of trace route path, altogether can support 16 forward-paths, it is possible to meet the demand of more appointment forward-path planning.
It should be understood that, switch 500 according to embodiments of the present invention may correspond to the primary nodal point in the method E-Packeted of the embodiment of the present invention, and above-mentioned and other operation of the modules in switch 500 and/or function are respectively in order to realize the corresponding flow process of each method in Fig. 1 to Fig. 4, for sake of simplicity, do not repeat them here.
The switch of the embodiment of the present invention, when message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing message in DCNFabric forwards.
Fig. 7 is the schematic block diagram of switch 700 according to another embodiment of the present invention, and switch 700 is applied in the data center network DCNFabric supporting to extend local network VXLAN technology. As it is shown in fig. 7, switch 700 includes: processor 710, memorizer 720, bus system 730 and transceiver 740. Processor 710, memorizer 720 and transceiver 740 are connected by bus system 730, and this memorizer 720 is used for storing instruction, and processor 710 is for performing the instruction of storage in memorizer 720.
Transceiver 740 is used for obtaining message. Processor 710 is used for: when described message requires over specified path forwarding, it is determined that the forward-path of described message; At least one outgoing interface is determined according to described forward-path. Transceiver 740 is for being forwarded to secondary nodal point by an outgoing interface in this at least one outgoing interface by described message.
The switch of the embodiment of the present invention, when message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing the message in DCNFabric forwards.
It should be understood that, in embodiments of the present invention, this processor 710 can be CPU (CentralProcessingUnit, CPU), this processor 710 can also is that other general processors, digital signal processor (DSP), special IC (ASIC), ready-made programmable gate array (FPGA) or other PLDs, discrete gate or transistor logic, discrete hardware components etc. The processor etc. that general processor can be microprocessor or this processor can also be any routine.
This memorizer 720 can include read only memory and random access memory, and provides instruction and data to processor 710. A part for memorizer 720 can also include nonvolatile RAM. Such as, the information of all right storage device type of memorizer 720.
This bus system 730 is except including data/address bus, it is also possible to includes power bus, control bus and status signal bus in addition etc. But in order to know for the purpose of explanation, in the drawings various buses are all designated as bus system 730.
In realizing process, each step of said method can be completed by the instruction of the integrated logic circuit of the hardware in processor 710 or software form. Hardware processor can be embodied directly in conjunction with the step of the method disclosed in the embodiment of the present invention to have performed, or combine execution by the hardware in processor and software module and complete. Software module may be located at random access memory, flash memory, read only memory, in the storage medium that this area such as programmable read only memory or electrically erasable programmable memorizer, depositor is ripe. This storage medium is positioned at memorizer 720, and processor 710 reads the information in memorizer 720, completes the step of said method in conjunction with its hardware. For avoiding repeating, it is not detailed herein.
In an alternative embodiment of the invention, transceiver 740 is specifically for when processor 710 determines multiple outgoing interface according to forward-path, adopting ECMP mode to select an outgoing interface in multiple outgoing interface that described message is forwarded to secondary nodal point.
In an alternative embodiment of the invention, described message is the VXLAN message after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path, and wherein said specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path. In a detailed description of the invention, when the value that described specified path forwards flag bit is 1, represent that described VXLAN message requires over specified path and forwards. Described ID of trace route path is used for indicating path.
Described processor 710 specifically for, after transceiver 740 obtains described message, according to described specified path forward flag bit determine that described VXLAN message forwards the need of by specified path; When described VXLAN message require over specified path forward time, determine the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets.
Alternatively, in an alternative embodiment of the invention, described message is original message. Transceiver 740 is specifically for the sink virtual machine VM described original message sent. Processor 710 specifically for: according to described original message obtain match index; Searching matching list according to described match index, wherein said matching list is used to determine whether to need described original message is carried out specified path forwarding; When described matching list exists the list item including described match index, it is determined that described original message requires over specified path and forwards; The forward-path of described original message is determined according to described match index; According to described forward-path, described original message is carried out VXLAN encapsulation, obtain described VXLAN message.
Wherein, processor 710 can be specifically for: the ID of trace route path and the specified path that add described forward-path in the outer layer IP head of described VXLAN message forward flag bit. Processor 710 can also be specifically for: searches forward table according to described match index, it is determined that described forward-path.
Described matching list is used to determine whether to need described original message is carried out specified path forwarding. In one embodiment, the list item of described matching list includes match index. Described matching list exists the list item of the match index including certain original message, namely shows that described original message requires over specified path and forwards. Described forward table is used for instructing message to forward, and described forward table can include multiple forwarding-table item, and each list item of described forward table includes the corresponding relation of match index, ID of trace route path and forward-path.
Specifically, the match index of described original message can include the access physical port of described original message, be at least one in the virtual LAN VLAN mark of original message or the five-tuple information of described original message.
Preferably, described specified path forwards flag bit and described ID of trace route path can carry in the reserved marker bit of the outer layer IP head Type Of Service TOS field of described VXLAN message.
It should be understood that, switch 700 according to embodiments of the present invention may correspond to the primary nodal point in the method E-Packeted of the embodiment of the present invention and switch 500, and above-mentioned and other operation of the modules in switch 700 and/or function are respectively in order to realize the corresponding flow process of each method in Fig. 1 to Fig. 4, for sake of simplicity, do not repeat them here.
The switch of the embodiment of the present invention, when message requires over specified path forwarding, determine the forward-path of this message, and determine at least one outgoing interface according to this forward-path, this message is forwarded by the outgoing interface then passed through in this at least one outgoing interface, it is possible to the specified path realizing the message in DCNFabric forwards.
Those of ordinary skill in the art are it is to be appreciated that the unit of each example that describes in conjunction with the embodiments described herein and algorithm steps, it is possible to being implemented in combination in of electronic hardware or computer software and electronic hardware. These functions perform with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme. Professional and technical personnel specifically can should be used for using different methods to realize described function to each, but this realization is it is not considered that beyond the scope of this invention.
Those skilled in the art is it can be understood that arrive, for convenience and simplicity of description, and the specific works process of the system of foregoing description, device and unit, it is possible to reference to the corresponding process in preceding method embodiment, do not repeat them here.
In several embodiments provided herein, it should be understood that disclosed system, apparatus and method, it is possible to realize by another way. Such as, device embodiment described above is merely schematic, such as, the division of described unit, being only a kind of logic function to divide, actual can have other dividing mode when realizing, for instance multiple unit or assembly can in conjunction with or be desirably integrated into another system, or some features can ignore, or do not perform. Another point, shown or discussed coupling each other or direct-coupling or communication connection can be through INDIRECT COUPLING or the communication connection of some interfaces, device or unit, it is possible to be electrical, machinery or other form.
The described unit illustrated as separating component can be or may not be physically separate, and the parts shown as unit can be or may not be physical location, namely may be located at a place, or can also be distributed on multiple NE. Some or all of unit therein can be selected according to the actual needs to realize the purpose of the present embodiment scheme.
It addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, it is also possible to be that unit is individually physically present, it is also possible to two or more unit are integrated in a unit.
If described function is using the form realization of SFU software functional unit and as independent production marketing or use, it is possible to be stored in a computer read/write memory medium. Based on such understanding, part or the part of this technical scheme that prior art is contributed by technical scheme substantially in other words can embody with the form of software product, this computer software product is stored in a storage medium, including some instructions with so that a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention. And aforesaid storage medium includes: USB flash disk, portable hard drive, read only memory are (English: Read-OnlyMemory, be called for short: ROM), random access memory (English: RandomAccessMemory, RAM), the various media that can store program code such as magnetic disc or CD be called for short:.
The above; being only the specific embodiment of the present invention, but protection scope of the present invention is not limited thereto, any those familiar with the art is in the technical scope that the invention discloses; change can be readily occurred in or replace, all should be encompassed within protection scope of the present invention. Therefore, protection scope of the present invention should be as the criterion with described scope of the claims.
Claims (12)
1. the method E-Packeted, it is characterised in that described method is applied to support that in the data center network DCNFabric of virtual expansible LAN VXLAN technology, described method includes:
Primary nodal point obtains message;
When described message requires over specified path forwarding, described primary nodal point determines the forward-path of described message;
Described primary nodal point determines at least one outgoing interface according to described forward-path;
Described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point.
2. method according to claim 1, it is characterized in that, described message is the VXLAN message after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path, described specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path
After described primary nodal point obtains described VXLAN message, described method also includes:
Described primary nodal point forwards flag bit to determine that described VXLAN message forwards the need of by specified path according to described specified path;
Wherein, described primary nodal point determines that the forward-path of described message includes:
Described primary nodal point determines the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets.
3. method according to claim 1, it is characterised in that described message is original message, described primary nodal point obtains message and includes: described primary nodal point receives the VM described original message sent,
Described method also includes:
Described primary nodal point obtains match index according to described original message;
Described primary nodal point searches matching list according to described match index, and wherein said matching list is used to determine whether to need described original message is carried out specified path forwarding;
When there is the list item including described match index in described matching list, described primary nodal point determines that described original message requires over specified path and forwards;
Wherein, described primary nodal point determines that the forward-path of described message includes: described primary nodal point determines the forward-path of described original message according to described match index;
Described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point, including: described original message is carried out VXLAN encapsulation by described primary nodal point, obtaining VXLAN message, the outer layer IP head of described VXLAN message includes specified path and forwards enable position and ID of trace route path; Described VXLAN message is forwarded to described secondary nodal point by an outgoing interface at least one outgoing interface described by described primary nodal point.
4. method according to claim 3, it is characterised in that described match index includes at least one in the access physical port of described original message, the virtual LAN VLAN mark of described original message or the five-tuple information of described original message.
5. the method according to any one of claim 2 to 4, it is characterised in that described specified path forwards flag bit and described ID of trace route path to carry in the reserved marker bit in described outer layer IP head Type Of Service TOS field.
6. method according to any one of claim 1 to 5, it is characterized in that, when described primary nodal point determines multiple outgoing interface according to described forward-path, described message is forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described and specifically includes by described primary nodal point:
Described primary nodal point adopts equal cost multipath ECMP mode, by an outgoing interface in the plurality of outgoing interface, described message is forwarded to described secondary nodal point.
7. a switch, it is characterised in that described application is in the data center network DCNFabric supporting virtual extended local network VXLAN technology, and described switch includes:
Acquisition module, is used for obtaining message;
Determine module, be used for: when described message requires over specified path forwarding, it is determined that the forward-path of described message, and determine at least one outgoing interface according to described forward-path;
Forwarding module, for being forwarded to secondary nodal point by an outgoing interface at least one outgoing interface described by described message.
8. switch according to claim 7, it is characterized in that, described message is the VXLAN message after encapsulation, the outer layer IP head of described VXLAN message includes specified path and forwards flag bit and ID of trace route path, and described specified path forwards flag bit to be used for indicating described VXLAN message to forward the need of by specified path;
Described determine module specifically for: obtain after described message at described acquisition module, forward flag bit to determine that described VXLAN message forwards the need of by specified path according to described specified path; When described VXLAN message require over specified path forward time, determine the forward-path of described VXLAN message according to described ID of trace route path and the forward table that pre-sets.
9. switch according to claim 7, it is characterised in that described message is original message, described acquisition module is specifically for the sink virtual machine VM described original message sent;
Described acquisition module is additionally operable to obtain match index according to described original message;
Described switch also includes: search module, and for searching matching list according to described match index, wherein said matching list is used to determine whether to need described original message is carried out specified path forwarding;
Described determine module specifically for: when described matching list exists include the list item of described match index time, it is determined that described original message requires over specified path and forwards; The forward-path of described original message is determined according to described match index;
Described forwarding module specifically for: described original message being carried out VXLAN encapsulation, obtains VXLAN message, the outer layer IP head of described VXLAN message includes specified path and forwards and enable position and ID of trace route path; By an outgoing interface at least one outgoing interface described, described VXLAN message is forwarded to described secondary nodal point.
10. switch according to claim 9, it is characterised in that described match index includes at least one in the access physical port of described original message, the virtual LAN VLAN mark of described original message or the five-tuple information of described original message.
11. according to Claim 8 to the switch according to any one of 10, it is characterised in that described specified path forwards flag bit and described ID of trace route path to carry in the reserved marker bit in described outer layer IP head Type Of Service TOS field.
12. the switch according to any one of claim 7 to 11, it is characterized in that, described forwarding module specifically for, when described determine that module determines multiple outgoing interface according to described forward-path time, adopt equal cost multipath ECMP mode by an outgoing interface in the plurality of outgoing interface, described message is forwarded to described secondary nodal point.
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