CN111314200A - Message forwarding method and device - Google Patents
Message forwarding method and device Download PDFInfo
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- CN111314200A CN111314200A CN202010131815.9A CN202010131815A CN111314200A CN 111314200 A CN111314200 A CN 111314200A CN 202010131815 A CN202010131815 A CN 202010131815A CN 111314200 A CN111314200 A CN 111314200A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4633—Interconnection of networks using encapsulation techniques, e.g. tunneling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/82—Miscellaneous aspects
- H04L47/825—Involving tunnels, e.g. MPLS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/70—Virtual switches
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/18—Multiprotocol handlers, e.g. single devices capable of handling multiple protocols
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Abstract
The application provides a message forwarding method and a device, the method is applied to a virtual switch in a VCPE in an NFV network, the VCPE also comprises a plurality of VMs, each VM and the virtual switch share an IP address and an MAC address, VXLANs which different VMs belong to are different, UDP port numbers corresponding to different VMs are different, each VM establishes a VXLAN tunnel with opposite-end client equipment CPE in the NFV network or at least one VM in the opposite-end VCPE, and the method comprises the following steps: receiving a message; when the destination MAC address of the message is the MAC address of the message, determining whether the message is a VXLAN message according to a protocol field in an IP (Internet protocol) header of the message; if so, forwarding the message to a destination device corresponding to a destination UDP port number in a UDP header of the message for processing. The method and the device can save a large amount of address resources.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a method and an apparatus for forwarding a packet.
Background
In a Network Function Virtualization (NFV) Network, as shown in fig. 1, a virtualized client device (VCPE) includes multiple Virtual Machines (VMs) and a Virtual Switch (vSwitch), such as VMs 1-VMn, and a controller allocates different IP addresses and MAC addresses to VMs 1-VMn and vSwitch, respectively, and VXLAN to which each VM belongs is different.
VCPE and Customer Premise Equipment (CPE) are used as VXLAN Tunnel End Points (VTEPs) in a networking, and each VM needs to separately establish a Virtual eXtensible local area network (VXLAN) Tunnel with the CPE to implement isolation of the tenant. The MAC address learned by the subsequent CPE is the MAC address of the VM, and when the vSwitch receives the message, the message may be sent to the CPE by the VM in the VCPE or sent to the VM in the VCPE, and the message is directly forwarded to the destination device corresponding to the destination MAC address according to the destination MAC address of the message for processing.
However, in practical applications, there may be tens to hundreds of VMs on one VCPE, and each VM needs to establish a VXLAN tunnel, so that the controller needs to allocate many IP addresses and MAC addresses, and consumes a lot of address resources.
Disclosure of Invention
The application provides a message forwarding method and device, which can save a large amount of address resources.
The technical scheme provided by the application is as follows:
the application provides a message forwarding method, which is applied to a virtual switch in a VCPE in an NFV network, wherein the VCPE further comprises a plurality of VMs, each VM and the virtual switch share an IP address and an MAC address, VXLANs to which different VMs belong are different, UDP port numbers corresponding to different VMs are different, and each VM establishes a VXLAN tunnel with at least one VM in an opposite-end CPE or an opposite-end VCPE in the NFV network, and the method comprises the following steps:
receiving a message;
when the destination MAC address of the message is the MAC address of the message, determining whether the message is a VXLAN message according to a protocol field in an IP (Internet protocol) header of the message;
and if so, forwarding the message to a destination device corresponding to a destination UDP port number in a UDP header of the message for processing.
The present application further provides a message forwarding apparatus, where the apparatus is applied to a virtual switch in a VCPE in an NFV network, the VCPE further includes multiple VMs, each VM and the virtual switch share an IP address and an MAC address, VXLANs to which different VMs belong are different, UDP port numbers corresponding to different VMs are different, and each VM establishes a VXLAN tunnel with an opposite CPE in the NFV network or at least one VM in an opposite VCPE, and the apparatus includes:
the receiving module is used for receiving the message;
a determining module, configured to determine whether the packet is a VXLAN packet according to a protocol field in an IP header of the packet when a destination MAC address of the packet is a MAC address of the packet;
and the forwarding module is used for forwarding the message to a destination device corresponding to a destination UDP port number in a UDP header of the message for processing when the judgment result is yes.
According to the technical scheme, the VCPE in the NFV network has the globally unique IP address and the MAC address, the virtual switch and the VMs in the VCPE share the addresses, a large amount of address resources are saved, the virtual switch in the subsequent VCPE identifies the VXLAN message through the identification protocol field, and the VXLAN message is normally forwarded according to different UDP port numbers corresponding to different VMs.
Drawings
Fig. 1 is a schematic networking diagram of an existing NFV network;
fig. 2 is a schematic networking diagram of an NFV network provided in an embodiment of the present application;
fig. 3 is a schematic flow chart of a message forwarding method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a packet forwarding apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In order to save address resources, in the embodiment of the present application, a controller in the NFV network allocates the same IP address and MAC address to the vSwitch and the multiple VMs in the VCPE in the NFV network, that is, one IP address and one MAC address are shared; the controller allocates different UDP port numbers to the VMs in the VCPE and sends the UDP port numbers to an opposite device of the VCPE, where the opposite device may be a CPE or a VCPE; different VMs in the VCPE belong to different VXLANs, and each VM may establish a VXLAN tunnel with the CPE at the opposite end or with at least one VM in the VCPE at the opposite end.
For example, as shown in FIG. 2, VMs 1-1-VM 1-n and vSwitch1 in VCPE1 share IP1 and MAC1, and VMs 2-1-VM 2-n and vSwitch2 in VCPE2 share IP2 and MAC 2; the UDP port numbers of the VMs in VCPE1 and VCPE2 are both different. For any one VM in each VCPE, a VXLAN tunnel may be established with a VM in an opposite-end VCPE according to the configuration of networking requirements, and one or multiple VXLAN tunnels may be established. Assuming that VM1-1 and VM2-1 establish a VXLAN tunnel, the MAC addresses learned by each other can be considered as the MAC address of vSwitch 1.
In the networking architecture of the NFV network, an embodiment of the present application provides a message forwarding method, where the method is applied to a vSwitch in a VCPE, and as shown in fig. 3, the method may include the following steps:
s31: and receiving the message.
S32: when the destination MAC address of the message is the MAC address of the message, determining whether the message is a VXLAN message according to a protocol field in an IP header of the message; if yes, go to step S13; when the determination result is no, step S14 is executed.
S33: and forwarding the message to a destination device corresponding to a destination UDP port number in a UDP header of the message for processing.
S34: and processing the message according to the message type represented by the IP protocol number in the protocol field in the IP header of the message.
Preferably, in step S32, it may be specifically determined whether the message is a VXLAN message by:
judging whether the IP protocol number in the protocol field in the IP header of the message is the IP protocol number for representing that the message type is VXLAN message; for example, IP protocol number 150;
if yes, determining the message as a VXLAN message.
It should be noted that, in the step S34, the Message type may also be an Internet Control Message Protocol (ICMP) Message, and the specific processing procedure is the prior art and will not be described in detail herein.
The message forwarding method is described in detail below by taking the example that the VM1-1 and the VM2-1 shown in fig. 2 have established a VXLAN tunnel.
The first situation is as follows: the vSwitch1 receives the message sent by the VM1-1
When the VM1-1 needs to send a data message to the VM2-1, the VM1-1 performs VXLAN tunnel encapsulation on the data message to obtain a VXLAN message.
That is, VM1-1 adds an outer MAC header, an outer IP header, an outer UDP header, and a VXLAN header to the data packet, where the source MAC address in the outer MAC address header is MAC1 and the destination MAC address is MAC 2; the IP protocol number in the protocol field in the header of the outer layer IP header is 150, the source IP address in the outer layer IP header is IP1, and the destination IP address is IP 2; the source UDP port number in the outer UDP header is UDP1-1, and the destination UDP port number is UDP 2-1; the VXLAN header has added thereto the VXLAN ID corresponding to VM 1-1.
VM1-1 sends the VXLAN message to vSwitch1, and vSwitch1 finds that the destination MAC address (i.e., MAC2) of the message is not itself, and directly sends the message to vSwitch 2.
After receiving the message, the subsequent vSwitch2 finds that the destination MAC address of the message is itself, further determines whether the IP protocol number in the protocol field in the IP header of the message is 150, in which case, the determination result is yes, which means that the message is a VXLAN message, and then forwards the message to the VM2-1 according to the destination UDP port number (UDP2-1) in the UDP header.
Case two: the vSwitch1 receives messages from the VM2-1 forwarded by the vSwitch2
After receiving the message sent by the vSwitch2, the vSwitch1 finds that the destination MAC address of the message is itself, further determines whether the IP protocol number in the protocol field in the IP header of the message is 150, in this case, the determination result is yes, which means that the message is a VXLAN message, then forwards the message to the VM1-1 according to the destination UDP port number (UDP1-1) in the UDP header, and the VM1-1 confirms the belonging VXLAN by analyzing the VXLAN ID of the VXLAN header, and performs subsequent processing.
According to the technical scheme, the VCPE in the NFV network has the globally unique IP address and the MAC address, the virtual switch and the VMs in the VCPE share the addresses, a large amount of address resources are saved, the virtual switch in the subsequent VCPE identifies the VXLAN message through identifying the protocol field, and the VXLAN message is normally forwarded according to different UDP port numbers corresponding to different VMs.
Based on the same inventive concept, the present application further provides a message forwarding apparatus, a schematic structural diagram of which is shown in fig. 4, the apparatus is applied to a virtual switch in a VCPE in an NFV network, the VCPE further includes a plurality of VMs, each VM and the virtual switch share an IP address and an MAC address, VXLANs to which different VMs belong are different, UDP port numbers corresponding to different VMs are different, and each VM establishes a VXLAN tunnel with an opposite-end CPE in the NFV network or at least one VM in an opposite-end VCPE, the apparatus includes:
a receiving module 41, configured to receive a message;
a determining module 42, configured to determine whether the packet is a VXLAN packet according to a protocol field in an IP header of the packet when a destination MAC address of the packet is a MAC address of the packet itself;
and a forwarding module 43, configured to forward the packet to a destination device corresponding to a destination UDP port number in a UDP header of the packet for processing if the determination result is yes.
Preferably, the determining module 42 is specifically configured to:
judging whether the IP protocol number in the protocol field in the IP header of the message is the IP protocol number for representing that the message type is VXLAN message;
and if so, determining that the message is a VXLAN message.
Preferably, the apparatus further comprises:
a processing module (not shown in fig. 4), configured to, when it is determined that the packet is not a VXLAN packet, process the packet according to a packet type represented by an IP protocol number in a protocol field in an IP header of the packet.
According to the technical scheme, the VCPE in the NFV network has the globally unique IP address and the MAC address, the virtual switch and the VMs in the VCPE share the addresses, a large amount of address resources are saved, the virtual switch in the subsequent VCPE identifies the VXLAN message through the identification protocol field, and the VXLAN message is normally forwarded according to different UDP port numbers corresponding to different VMs.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.
Claims (6)
1. A message forwarding method is applied to a virtual switch in a virtualized client device (VCPE) in a Network Function Virtualization (NFV) network, the VCPE further comprises a plurality of Virtual Machines (VMs), each VM and the virtual switch share an IP address and a Media Access Control (MAC) address, different VMs belong to different extensible virtual local area networks (VXLANs), User Data Protocols (UDP) port numbers corresponding to the different VMs are different, and each VM establishes a VXLAN tunnel with at least one of an opposite-end client device (CPE) or an opposite-end VCPE in the NFV network, and the method comprises the following steps:
receiving a message;
when the destination MAC address of the message is the MAC address of the message, determining whether the message is a VXLAN message according to a protocol field in an IP (Internet protocol) header of the message;
and if so, forwarding the message to a destination device corresponding to a destination UDP port number in a UDP header of the message for processing.
2. The method according to claim 1, wherein determining whether the packet is a VXLAN packet according to a protocol field in an IP header of the packet specifically comprises:
judging whether the IP protocol number in the protocol field in the IP header of the message is the IP protocol number for representing that the message type is VXLAN message;
and if so, determining that the message is a VXLAN message.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
and when the message is judged not to be the VXLAN message, processing the message according to the message type represented by the IP protocol number in the protocol field in the IP header of the message.
4. A message forwarding device is applied to a virtual switch in a virtualized client device (VCPE) in a Network Function Virtualization (NFV) network, the VCPE further comprises a plurality of Virtual Machines (VMs), each VM and the virtual switch share an IP address and a Media Access Control (MAC) address, different VMs belong to different extensible virtual local area networks (VXLANs), User Data Protocols (UDP) port numbers corresponding to the different VMs are different, and each VM establishes a VXLAN tunnel with at least one of an opposite-end client device (CPE) or an opposite-end VCPE in the NFV network, and the message forwarding device comprises:
the receiving module is used for receiving the message;
a determining module, configured to determine whether the packet is a VXLAN packet according to a protocol field in an IP header of the packet when a destination MAC address of the packet is a MAC address of the packet;
and the forwarding module is used for forwarding the message to a destination device corresponding to a destination UDP port number in a UDP header of the message for processing when the judgment result is yes.
5. The apparatus according to claim 4, wherein the determining module is specifically configured to:
judging whether the IP protocol number in the protocol field in the IP header of the message is the IP protocol number for representing that the message type is VXLAN message;
and if so, determining that the message is a VXLAN message.
6. The apparatus of claim 4 or 5, further comprising:
and the processing module is used for processing the message according to the message type represented by the IP protocol number in the protocol field in the IP header of the message when the message is judged not to be the VXLAN message.
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