CN102970227B - The method and apparatus of VXLAN message repeating is realized in ASIC - Google Patents
The method and apparatus of VXLAN message repeating is realized in ASIC Download PDFInfo
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Abstract
Present invention is disclosed a kind of method and apparatus realizing VXLAN message repeating in ASIC, the forwarding of described VXLAN message is completed by the VXLAN gateway processes be arranged between server and IP network, the VXLAN message of described forwarding comprises uplink message and downlink message, described uplink message is the message being sent to IP network from server side, the message that its processing procedure comprises receiving is resolved, and judging whether needs to carry out forward process; To the message needing to forward, obtain the VXLANID of its correspondence; Do you use VXLAN? ID and message target MAC (Media Access Control) address table look-up obtain message process information and forward port information, forward after treating the encapsulation process that E-Packets.Present invention achieves the behaviors such as the clean culture of VXLAN message, multicast, and be solidificated in ASIC by logic, achieve the transition of forwarding territory to the forwarding territory based on VXLAN of VLAN.
Description
Technical field
The present invention relates to network communication field, particularly relate to the method and apparatus realizing VXLAN message repeating in ASIC (Ethernet switching chip) design.
Background technology
Along with virtual and progressively development that is cloud computing, following data center will dispose the application of virtual machine in a large number.In order to control between different virtual machine and virtual machine, and the communication between virtual machine and tenant, the means becoming isolation LAN that VLAN (VirtualLocalAreaNetwork, VLAN) is just natural.But due to the extensive use of virtual technology, in a data center, supported tenant's quantity also increases greatly, and two layer MAC address will occur the growth of explosion type, and the MAC Address in theory in different virtual LAN can be overlapping.Therefore, original 4KVLAN quantity is had too many difficulties to cope with.
VXLAN (VirtualExtensibleLocalAreaNetwork, easily extensible virtual network) just in this context, the scheme of the solution VLAN insufficient space proposed by IETF, replace VLAN to participate in forwarding by the VXLANID of a 24bit to table look-up, greatly extend the quantity of VLAN.
In the application scenarios of VXLAN, have a kind of gateway function, the intercommunication between the territory of non-VXLAN and VXLAN territory can be realized, but this function needs switch support, realize the forwarding of high bandwidth.
VXLAN is at present with also in the draft stage, but its network layer and good autgmentability clearly, make VXLAN become one probably the solution approved by masses.So in network exchanging chip, the retransmission technique how realizing VXLAN message is not also resolved.
Summary of the invention
The object of the present invention is to provide a kind of method and apparatus realizing VXLAN message repeating in ASIC, it can carry out VXLAN encapsulation and decapsulation to message, thus gateway (gateway) function by realizing VXLAN, realize forwarding territory based on VLAN to the transition in the forwarding territory based on VXLAN.
For achieving the above object, the present invention proposes following technical scheme: a kind of method realizing VXLAN message repeating in ASIC, comprises the following steps:
A. the message that VXLAN gateway receives is resolved, judge whether to need to carry out forward process;
B. to the message needing to forward, the VXLANID of its correspondence is obtained;
C. look into two-layer retransmitting table according to the target MAC (Media Access Control) address of message and VXLANID, obtain the process information of message and forward port information;
D. treating E-Packets carries out encapsulating or forwarding after editing and processing.
Further, described VXLAN message is the uplink message being sent to IP network from server.
In described step b, VXLANID is marked by VLAN or source MAC.
Process information in described step c comprises acquisition destination interface and packaging information; Treating in described steps d E-Packets, and what carry out is encapsulation process.
Described VXLAN message is the downlink message being sent to server from IP network, and in described step c, the acquisition of VXLANID obtains information entrained in header by decapsulation VXLAN message.
Process information in described step c comprises acquisition destination interface and edit file; Treating in described steps d E-Packets, and what carry out is editing and processing.
In step c, if checking result is multicast, then carry out multicast replication, and obtain the process information of each multicast member.
Present invention also offers a kind of device realizing VXLAN message repeating in ASIC, it comprises:
A. packet parsing and judge module, for resolving the message received, judges whether to need to carry out forward process;
B.VXLANID determination module, for the message needing to forward, obtains the VXLANID of its correspondence;
C. table look-up module is transmitted, the process information obtaining message for being tabled look-up by VXLANID and message target MAC (Media Access Control) address and forwarding port information;
D. packet forwarding module, treating E-Packets carries out encapsulating or forwarding after editing and processing.
Further, the forwarding of described VXLAN message is completed by the VXLAN gateway processes be arranged between server and IP network, and described server supports there is multiple stage virtual machine.
Described device also comprises the incoming interface message processing module of the message incoming interface information obtaining VXLAN gateway, obtains the outgoing interface information module of outgoing interface information, message is carried out to the decapsulation module of decapsulation, and to the editor module that message is edited.
Compared with prior art, the method and apparatus realizing VXLAN message repeating in ASIC that the present invention proposes achieves the clean culture of VXLAN message, multicast and broadcast.Meanwhile, the present invention, as a sub-feature of Ethernet switching chip, is solidificated in ASIC by logic, makes full use of the advantage of Ethernet switching chip high bandwidth, low cost, reduces for data center in the future carries out VLAN expansion the cost disposed.
Accompanying drawing explanation
Fig. 1 is the network diagram that the present invention realizes VXLAN message repeating in ASIC;
Fig. 2 is the forwarding process figure that the present invention forwards up VXLAN message;
Fig. 3 is the forwarding process figure of converting downlink VXLAN message of the present invention.
Embodiment
Below in conjunction with accompanying drawing of the present invention, clear, complete description is carried out to the technical scheme of the embodiment of the present invention.
As shown in Figure 1, what the present invention disclosed realizes VXLAN message repeating in ASIC, realize in the gateway of VXLAN, multiple VXLAN gateway is provided with between IP network and server, as the VXLANgateway1 in figure, VXLANgateway2, VXLANgateway3 and VXLANgateway4, to carry out the transfer of data between IP network and server.Each VXLAN gateway is connected with multiple servers, each server is provided with multiple stage virtual machine.Each VXLAN gateway can receive and be sent to the uplink message of IP network from corresponding server and be sent to the downlink message of corresponding server from IP network, it is then forwarded to destination address after processing received message, and the process of VXLAN gateway to uplink message and the handling process to downlink message are described below respectively:
One, uplink message process
What uplink message referred to that VXLAN gateway receives sends from server side the message needing to be encapsulated by VXLAN.When VXLAN gateway receives the uplink message sent from server side, as the VXLANgateway1 in Fig. 1, when what it received is sent to the message on IP network road from server 1 or server 2, this message is forwarded to IP network after processing in VXLANgateway1.In VXLAN gateway, analytic message is comprised to the processing procedure of this uplink message, obtain incoming interface information, determine the VXLANID in message, search two-layer retransmitting table table, after multicast, obtain outgoing interface information, then carry out message encapsulation and message repeating.Accordingly, its uplink message processing unit comprises packet parsing module, incoming interface data obtaining module, VXLANID module, two layers forward table look-up module, multicast module, multicast member replication module, outlet information acquisition module, message package module and packet forwarding module.
Specifically, the flow chart of uplink message process as shown in Figure 2, VXLAN gateway is resolved by packet parsing module the uplink message received, and the various information required for subsequent treatment of obtaining are as outer IP head, Ethernet head, and VXLAN header etc.; Incoming interface data obtaining module determines whether needing to carry out the process of VXLAN uplink message according to the configuration information of message sink mouth; If need the process carrying out VXLAN uplink message, then also will obtain the mapping relations of VXLANID, the mapping relations of this VXLANID mark VXLANID by VLAN or source MAC.
VXLANID determination module is tabled look-up according to the mapping relations of the VXLANID obtained before, as VXLANID VLAN mark time, search as keyword with incoming interface ID and VLANID, can obtain in the output of lookup result forward need VXLANID.
Two-layer retransmitting table table look-up module is tabled look-up as keyword jointly according to the target MAC (Media Access Control) address of message and VXLANID, obtains destination and the edit mode of this message.If multicast message, then for each multicast member, obtain corresponding destination and edit mode, subsequent treatment will process successively for each multicast member.In two-layer retransmitting table table look-up module, usually needing to arrange a default entry, must return results when tabling look-up like this.Under normal circumstances, broadcast, multicast and unknown unicast message can use this entry, its objective is and make current message be flooded to all members in virtual forwarding territory.
Outgoing interface data obtaining module obtains the information of outgoing interface according to the destination of transmitting decision.
Message package module is according to the packaging information transmitting decision, encapsulate accordingly, comprise the encapsulation of VXLAN head, UDP head, outer IP head, outer Ethernet head, then give packet forwarding module and send from corresponding destination interface, thus complete the processing procedure of VXLAN uplink message.
Two, downlink message process
Downlink message refers to that VXLAN gateway receives the message with VXLAN encapsulation sent from IP network.After the process of downlink message being comprised and receives downlink message in VXLAN gateway, then by its decapsulation, and use internal mac address lookup table and be transmitted to the processing procedure of home server, as the message being sent to the virtual machine server 1 or server 2 from IP network that the VXLANgateway1 in Fig. 1 receives.Downlink message processing unit in VXLAN gateway comprises packet parsing module, incoming interface data obtaining module, decapsulation module, two-layer retransmitting table table look-up module, multicast module, multicast member replication module, outgoing interface data obtaining module, message editing module and packet forwarding module.
Specifically, the process chart of downlink message as shown in Figure 3, packet parsing module is resolved the message received, and the various information required for subsequent treatment of obtaining are as outer IP head, Ethernet head, and VXLAN header etc.; The configuration information of incoming interface data obtaining module according to message sink mouth and the encapsulating structure of current message, determine whether needing to carry out the process of VXLAN downlink message, only have when message has VXLAN encapsulation, and outer object IP be this access point need to be processed time, just can enter follow-up decapsulation module; Otherwise only perform common route processing.Decapsulation module, according to incoming interface information, uses outer object IP, source IP to table look-up as keyword with being encapsulated in together with the VXLANID in message, obtains decapsulation information.Then outer IP head, the Ethernet head of message is removed, and VXLAN header, and obtain virtual forwarding domain information entrained in VXLAN header.
Two-layer retransmitting table table look-up module is tabled look-up as keyword jointly according to the target MAC (Media Access Control) address of internal layer and the VXLANID be encapsulated in message, obtain the process information of message, this process information comprises destination interface and edit file, owing to now not needing to encapsulate message, therefore only some edit files may be had, as VLAN.When checking result is multicast, then need to carry out multicast replication, then obtain destination interface and the edit file of each multicast member.
Outgoing interface data obtaining module, according to the result of tabling look-up, obtains the port information needing to forward.
In message editing module, according to the configuration of checking result and destination interface, necessary editor is carried out to internal layer message, then gives packet forwarding module and forward.
In message editing module, topmost effect goes out vlan information corresponding on destination interface virtual machine according to the virtual forwarding domain mapping of VXLAN, to make server identify, sends to corresponding virtual machine.
In two-layer retransmitting table table look-up module, the same with uplink message process, need to arrange a default entry, make message be flooded to all members in home server in virtual forwarding territory.
Technology contents of the present invention and technical characteristic have disclosed as above; but those of ordinary skill in the art still may do all replacement and the modification that do not deviate from spirit of the present invention based on teaching of the present invention and announcement; therefore; scope should be not limited to the content that embodiment discloses; and various do not deviate from replacement of the present invention and modification should be comprised, and contained by present patent application claim.
Claims (8)
1. in ASIC, realize a method for VXLAN message repeating, it is characterized in that comprising the following steps:
A. resolve the message that VXLAN gateway receives, judge whether to need to carry out forward process, described VXLAN message comprises and is sent to the uplink message of IP network from server and is sent to the downlink message of server from IP network;
B. to the message needing to forward, obtain the VXLANID of its correspondence, when described VXLAN message is described uplink message, to the VXLAN uplink message needing to forward, then first obtain the mapping relations of VXLANID, the mapping relations of described VXLANID mark VXLANID by VLAN or source MAC, then table look-up according to the mapping relations of the VXLANID obtained, in the output of lookup result, obtain VXLANID;
C. look into two-layer retransmitting table according to the target MAC (Media Access Control) address of message and VXLANID, obtain the process information of message and forward port information;
D. treating E-Packets carries out encapsulating or forwarding after editing and processing.
2. method according to claim 1, is characterized in that: described VXLAN message is the uplink message being sent to IP network from server, and the process information in described step c comprises acquisition destination interface and packaging information; Treating in described steps d E-Packets, and what carry out is encapsulation process.
3. method according to claim 1, is characterized in that: described VXLAN message is the downlink message being sent to server from IP network, and in described step c, the acquisition of VXLANID obtains information entrained in header by decapsulation VXLAN message.
4. method according to claim 3, is characterized in that: the process information in described step c comprises acquisition destination interface and edit file; Treating in described steps d E-Packets, and what carry out is editing and processing.
5. the method according to Claims 1-4 any one, is characterized in that: in step c, if checking result is multicast, then carries out multicast replication, and obtains the process information of each multicast member.
6. in ASIC, realize a device for VXLAN message repeating, it is characterized in that comprising:
A. packet parsing and judge module, for resolving the message received, judges whether to need to carry out forward process, and described VXLAN message comprises and is sent to the uplink message of IP network from server and is sent to the downlink message of server from IP network;
B.VXLANID determination module, for the message forwarded needs, obtain the VXLANID of its correspondence, when described VXLAN message is described uplink message, to the VXLAN uplink message needing to forward, then first obtain the mapping relations of VXLANID, the mapping relations of described VXLANID mark VXLANID by VLAN or source MAC, table look-up according to the mapping relations of the VXLANID obtained again, in the output of lookup result, obtain VXLANID;
C. table look-up module is transmitted, the process information obtaining message for being tabled look-up by VXLANID and message target MAC (Media Access Control) address and forwarding port information;
D. packet forwarding module, treating E-Packets carries out encapsulating or forwarding after editing and processing.
7. device according to claim 6, is characterized in that: the forwarding of described VXLAN message is completed by the VXLAN gateway processes be arranged between server and IP network, and described server supports there is multiple stage virtual machine.
8. device according to claim 6, it is characterized in that: described device also comprises the incoming interface message processing module of the message incoming interface information obtaining VXLAN gateway, obtain the outgoing interface information module of outgoing interface information, message is carried out to the decapsulation module of decapsulation, and to the editor module that message is edited.
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