WO2019129236A1

WO2019129236A1 - Tunnel-based data transmission method and device

Info

Publication number: WO2019129236A1
Application number: PCT/CN2018/125039
Authority: WO
Inventors: 张平平; 陈志伟; 夏迎春; 孙军欢
Original assignee: 中兴通讯股份有限公司
Priority date: 2017-12-29
Filing date: 2018-12-28
Publication date: 2019-07-04
Also published as: CN109995654B; CN109995654A

Abstract

Disclosed by the present document is a tunnel-based data transmission method, comprising: in an overlay network, encapsulating a message in a tunnel, and configuring an outlet of the tunnel as a loopback port; in a basic network, looping back the message encapsulated in the tunnel at the loopback port, searching for an equal-cost multi-path (ECMP) routing protocol ECMP routing table according to a destination Internet Protocol (IP) address of the message encapsulated in the tunnel so as to obtain a plurality of next hop IP addresses, and forwarding the message encapsulated in the tunnel by means of a plurality of forwarding ports corresponding to the plurality of next hop IP addresses. Also disclosed by the present document is a tunnel-based data transmission device.

Description

Method and device for transmitting data based on tunnel

The present application claims priority to Chinese Patent Application No. PCT Application No. No. No. No.

Technical field

The present disclosure relates to the field of communication technologies, for example, to a method and apparatus for transmitting data based on a tunnel.

Background technique

Tunneling (Tunneling) is a tunneling protocol implementation that uses the infrastructure of the Internet to transfer data between networks, following the standards of organizations such as the Institute of Electrical and Electronics Engineers (IEEE). The data (or load) delivered using tunneling techniques can be data frames or packets of different protocols. The tunneling protocol re-encapsulates data frames or packets of other protocols and then sends them through the tunnel. The new data frame header provides routing information to pass the encapsulated payload data over the Internet. Typical tunneling technologies include: Multi-Protocol Label Switching (MPLS), Virtual Extensible Local Area Network (VXLAN), and Transparent Interconnection of Lots of Links (TRILL).

The underlying network (Underlay network) is the network of the basic forwarding structure of the data center network. It is the physical foundation layer. As long as the data between the two points of the data center network is reachable, the basic network contains all relevant traditional network technologies. Overlay network (Overlay network) is a virtualized framework superimposed on the network architecture. It is constructed by logical nodes and logical links. It has independent control plane and forwarding plane. The Overlay network implements the bearer of the application layer on the Underlay network, and realizes the separation of services from other networks, and realizes the attempt to extend the physical network to the cloud and the virtualized network, so that the cloud resource pooling capability can get rid of the physical network. Restrictions to achieve cloud network convergence.

Equal-Cost Multi-path Routing (ECMP) is a routing technology. In a network environment where multiple different links reach the same destination address, if the traditional routing technology is used, the data packet destined for the destination address can only use one of the links, and the other links are in the backup state or inactive state. Moreover, it takes a certain time to switch between each other in a dynamic routing environment, and ECMP can use multiple links simultaneously in the network environment, which not only increases the transmission bandwidth, but also backs up the data of the failed link without delay and without packet loss. transmission. The biggest feature of ECMP is that it achieves the goal of multipath load balancing and link backup in the case of equal value. ECMP is basically supported in static routing and Open Shortest Path First (OSPF).

As the number of services deployed increases, the number of tunnels to be established in the data center is increasing. If the Underlay network applies ECMP technology, the hardware resources required to establish a tunnel in the Overlay network will be more. As shown in Figure 1, when a VXLAN tunnel is created in an ECMP scenario, tunnels are set up according to the egress corresponding to each next hop in the ECMP group. However, the number of underlying tunnels is limited, so the ECMP scenario is limited. The number of tunnels supported by the Overlay network.

Summary of the invention

The embodiments of the present disclosure provide a method and an apparatus for transmitting data based on a tunnel, which can provide a tunnel transmission scheme in an equal-cost multi-path routing protocol scenario, and reduce multi-port forwarding while reducing tunnel resources in an underlying chip of the overlay network device. Quantity.

In an embodiment, an embodiment of the present disclosure provides a method for transmitting data based on a tunnel, including:

The tunnel is encapsulated in the overlay network, and the exit of the tunnel is set as a loopback interface.

In the basic network, the loopback of the packet encapsulated by the tunnel is performed on the loopback interface;

In the basic network, the ECMP routing table of the equivalent multipath routing protocol is obtained according to the destination Internet Protocol (IP) address of the packet encapsulated by the tunnel, and multiple next hop IP addresses are obtained. The packet encapsulated by the tunnel is forwarded by multiple forwarding ports corresponding to the multiple next hop IP addresses.

In an embodiment, an embodiment of the present disclosure provides an apparatus for transmitting data based on a tunnel, including:

The tunnel encapsulation module is configured to encapsulate the packet in the overlay network and set the exit of the tunnel as a loopback interface.

The loopback module is configured to perform loopback on the packet encapsulated by the tunnel in the loopback interface, and send the packet encapsulated by the tunnel to the route forwarding module.

The routing and forwarding module is configured to obtain a plurality of next hop IP addresses according to the destination IP address of the packet encapsulated by the tunnel, and obtain a plurality of next hop IP addresses according to the destination IP address of the packet encapsulated by the tunnel. The packets encapsulated by the tunnel are forwarded through multiple forwarding ports corresponding to the multiple next hop IP addresses.

DRAWINGS

Figure 1 is a schematic diagram of creating a VXLAN tunnel in an ECMP scenario;

FIG. 2 is a flowchart of a method for transmitting data based on a tunnel according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of an apparatus for transmitting data based on a tunnel according to an embodiment of the present disclosure;

4 is a flowchart of a method for implementing data transmission based on a tunnel in an internal loopback manner according to Example 1 of the present disclosure;

5 is a flowchart of a method for implementing data transmission based on a tunnel in an external loopback manner according to Example 2 of the present disclosure;

6 is a schematic diagram of creating a tunnel in an overlay network in Example 3 of the present disclosure.

Detailed ways

Example 1

As shown in FIG. 2, an embodiment of the present disclosure provides a method for transmitting data based on a tunnel, including:

Step 210: Tunnel the packet in the overlay network, and set the exit of the tunnel as a loopback.

Step 220: Perform loopback on the packet encapsulated by the tunnel in the loopback interface in the basic network.

Step 230: In the basic network, searching for the ECMP routing table of the equivalent multipath routing protocol to obtain multiple next hop IP addresses according to the destination IP address of the packet encapsulated by the tunnel, and the The packet encapsulated by the tunnel is forwarded by multiple forwarding ports corresponding to the multiple next hop IP addresses.

In an embodiment, before the setting of the exit of the tunnel as a loopback, the method further includes:

Establishing an inner ring interface, and configuring a media access control (MAC) address offset for the inner ring port; wherein the MAC address offset is used to send the inner ring port The source MAC address and destination MAC address are different.

In an embodiment, the setting the outlet of the tunnel as a loopback includes: setting an outlet of the tunnel as an inner ring.

In an embodiment, loopback is performed on the tunnel encapsulated packet at the loopback end, including:

Transmitting the packet encapsulated by the tunnel to the inner ring port and receiving it back from the inner ring port.

Establishing a first outer ring port and a second outer ring port, and directly connecting the first outer ring port to the second outer ring port; adding the first outer ring port to the first virtual route forwarding instance (Virtual Routing Forwarding-instance (VRF)1, adding the second outer ring interface to the second virtual route forwarding instance VRF2; recording the statically configured or dynamically learned ECMP route in the routing table in the VRF2, and The ECMP route in the VRF2 is imported into the VRF1, and the MAC address offset is configured for the first outer ring interface. The MAC address offset is used to send the packet to the first outer ring interface. The source MAC address and destination MAC address are different.

In an embodiment, the setting the outlet of the tunnel as a loopback includes: setting an outlet of the tunnel as a first outer ring.

In an embodiment, the loopback is performed on the packet encapsulated by the tunnel at the loopback end, including:

Transmitting the packet encapsulated by the tunnel to the first outer ring interface, and receiving the packet from the second outer ring port.

In an implementation manner, the tunneling the packet includes:

Decapsulating the packet by using an encapsulation rule corresponding to the service feature according to the service feature of the packet;

The service feature of the packet includes at least one of the following: a destination IP address of the packet, and a destination MAC address of the packet;

The encapsulation rules include: a multi-protocol label switching MPLS encapsulation rule, a virtual extensible local area network VXLAN encapsulation rule, or a multi-link transparent interconnection TRILL encapsulation rule.

In an embodiment, the inner ring port is a high bandwidth port or a port group formed by multi-port link bundling.

In an embodiment, the first outer ring port is a high bandwidth port or a port group formed by multi-port link bundling; the second outer ring port is a high bandwidth port or is formed by bundling a multi-port link. Port group.

In the technical solution of the embodiment, by setting the exit of the tunnel in the overlay network as a loopback port, the multiple tunnel resources in the underlying chip of the network device can be reduced to a tunnel resource in the technical solution of the embodiment, and the basis is (Underlay) The network can forward packets to multiple forwarding outlets by searching multiple next hops of the ECMP route, so as to implement forwarding performance of multiple tunnels in the overlay network.

Example 2

As shown in FIG. 3, an embodiment of the present disclosure provides an apparatus for transmitting data based on a tunnel, including:

The tunnel encapsulation module 310 is configured to tunnel the packet in the overlay network and set the exit of the tunnel as a loopback port.

The loopback module 320 is configured to perform loopback on the packet encapsulated by the tunnel in the loopback interface, and send the packet encapsulated by the tunnel to the route forwarding module.

The routing and forwarding module 330 is configured to obtain, according to the destination IP address of the packet encapsulated by the tunnel, the EPO routing table of the equivalent multipath routing protocol to obtain multiple next hop IP addresses in the basic network, The packet encapsulated by the tunnel is forwarded by multiple forwarding ports corresponding to the multiple next hop IP addresses.

In an embodiment, the apparatus further includes a first configuration module;

The first configuration module is configured to establish an inner ring interface, and configure a medium access control MAC address offset for the inner ring port; wherein the MAC address offset is used to send the inner ring port The source MAC address and destination MAC address of the packet are different.

In an embodiment, the tunnel encapsulation module 310 is configured to set the outlet of the tunnel as an inner ring.

The loopback module 320 is configured to send the packet encapsulated by the tunnel to the inner ring port and receive the packet back from the inner ring port.

In an embodiment, the device further includes a second configuration module;

The second configuration module is configured to establish a first outer ring mouth and a second outer ring port, and directly connect the first outer ring port and the second outer ring port; Joining the first virtual routing forwarding instance VRF1, adding the second outer ring interface to the second virtual routing forwarding instance VRF2; recording the statically configured or dynamically learned ECMP routing in the routing table in the VRF2, and The ECMP route in the VRF2 is imported into the VRF1, and the MAC address offset is configured for the first outer ring interface. The MAC address offset is used to send the packet to the first outer ring interface. The source MAC address and destination MAC address are different.

The tunnel encapsulation module 310 is configured to set the outlet of the tunnel as a first outer ring.

The loopback module 320 is configured to send the packet encapsulated by the tunnel to the first outer ring interface, and receive the packet from the second outer ring port.

In an embodiment, the tunnel encapsulation module 310 is configured to tunnel encapsulate the packet according to a service feature corresponding to the service feature according to a service feature of the packet.

In an embodiment, the inner ring port is a high bandwidth port or a port group formed by multi-port link bundling;

In the technical solution of the embodiment, by setting the exit of the tunnel in the overlay network as a loopback port, the multiple tunnel resources in the underlying chip of the network device can be reduced to a tunnel resource in the technical solution of the embodiment, and the basis is By looking up multiple next hops of an ECMP route, the network can forward packets out of multiple forwarding outlets to achieve the forwarding performance of multiple tunnels in an overlay network.

Example 3

The technical solution of tunneling data based on the present application is illustrated by some examples below.

Example 1

This example provides an internal loopback mode to implement data transmission based on tunnels in an ECMP scenario. After the tunnel encapsulation module encapsulates the tunnel information in the tunnel encapsulation module, the packet is sent to the inner ring interface. After the inner ring interface is reached, it is looped back into the routing and forwarding module. The ECMP route is searched in the forwarding module. The last packet is forwarded from the forwarding port corresponding to multiple next hops of the ECMP route.

As shown in FIG. 4, the tunnel-based data transmission method of this example may include the following steps:

Step 401: Specify an inner ring interface of the switching device globally.

A port is selected as an inner ring port on the switching device; the packet sent from the inner ring port can be received back from the inner ring port; and the MAC address offset of the inner ring port is configured. The next hop of the tunnel is the loopback of the local device. If the MAC address offset is not configured, the source and destination MAC addresses of the packets encapsulated by the tunnel encapsulation module are the same. Considering bandwidth and reliability requirements, you can set up a link aggregation (smartgroup) to implement multi-port link bundling to meet the forwarding requirements of high-bandwidth traffic.

Step 402: The route forwarding module learns the ECMP route according to the dynamic routing protocol.

Step 403: The tunnel encapsulation module encapsulates the packet and sets the exit of the tunnel as an inner ring interface.

Step 404: After the message is sent to the inner ring port, it is received back from the inner ring port through the loopback.

Step 405: The routing and forwarding module forwards the received packet from the inner ring interface, queries the ECMP route to obtain multiple next hop IP addresses, and forwards the packet from multiple forwarding ports corresponding to multiple next hop IP addresses. .

Example 2

This example provides an external loopback mode to implement tunnel-based data transmission in an ECMP scenario. Set two Virtual Forwarding Routes (VRFs), which are VRF1 and VRF2 respectively. Then select two external ports to belong to the two VRFs, and then enable routing mutual routing between VRF1 and VRF2.

As shown in FIG. 5, the tunnel-based data transmission method of this example may include the following steps:

Step 501, the two outer ring ports (the first outer ring port and the second outer ring port) of the switching device are specified, and the two outer ring ports are directly connected externally, and two VRFs (VRF1 and VRF2) are configured to be the first outer ring. Add VRF1 to the port and add the second outer ring to VRF2.

In step 502, the ECMP route is learned in the VRF2, and the route of the VRF2 is imported into the VRF1.

Step 503: The tunnel encapsulation module encapsulates the packet and sets the exit of the tunnel as the first outer ring interface.

Step 504: After the packet is sent to the first outer ring interface, the packet is sent out from the first outer ring port and received from the second outer ring port.

Step 505: The route forwarding module receives the packet from the second outer ring interface, queries the ECMP route to obtain multiple next hop IP addresses, and sends the packet from multiple forwarding ports corresponding to multiple next hop IP addresses. Forward it out.

Example 3

This example provides an external loopback method for implementing data transmission based on a VXLAN tunnel, and may include the following steps:

Step 1: Configure or learn ECMP routes in VRF2. The first outer ring interface is added to VRF1, and the second outer ring port is added to VRF2. The first outer ring port and the second outer ring port are directly connected.

The ECMP route points to multiple next hop outlets.

The first outer ring port and the second outer ring port can select high-bandwidth physical ports, or link aggregation (multi-port) through link aggregation (smartgroup) to meet the forwarding requirements of high-bandwidth traffic.

Step 2: Routing mutual routing between VRF1 and VRF2.

Step 3: Configure the MAC address offset of the Layer 3 interface corresponding to the first outer ring interface in VRF1 to prevent the source MAC (SMAC) of the encapsulated packets from being equal to the destination MAC (DMA).

Step 4: When the tunnel encapsulation module receives the dynamic protocol or statically sends the VXLAN tunnel, the outbound port of the tunnel is specified according to the routing information in VRF1, and the egress port is the first outer ring interface, so that the tunnel encapsulation module is encapsulated. After that, the packet is sent to the first outer ring interface and the source MAC address of the packet is the address after the MAC offset is set.

Step 5: The packet is sent out from the first outer ring interface and received from the second outer ring interface. The route forwarding module performs packet feature matching in the VRF2, and queries the ECMP route to obtain multiple next hop IP addresses. The forwarding port corresponding to the next hop IP address forwards the packet.

In this example, the three-layer forwarding of packets is shared from different ports, which can achieve the forwarding performance of multiple tunnels in the overlay network. In fact, only one tunnel in the overlay network is established (the tunnel exit is Outer ring mouth). In this example, you can create a VXLAN tunnel in an ECMP scenario. See Figure 6. Figure 6 is a schematic diagram of creating a tunnel in an overlay network.

In other implementations, the method for implementing data transmission of other tunneling protocols in the external loopback mode is similar to the present example, except that the encapsulation rules used by the tunnel encapsulation module to encapsulate packets are different, for example, data transmission for the MPLS protocol, tunnel The encapsulation module encapsulates the tunnel header based on the MPLS protocol, and the loopback processing and ECMP routing and forwarding are the same as the present example.

Example 4

This example provides a method for implementing data transmission based on a vxlan tunnel in an inner loop manner, which may include the following steps:

Step 1: Specify the inner ring port globally.

A high-bandwidth physical port or a high-bandwidth and high-reliability link aggregation group can be selected as the internal loopback port. This example selects the smartgroup group as the internal ringback port. First, configure the smartgroup group, add the ports to the smartgroup group, and then enable the smartgroup group to be in inner ring mode.

Step 2: Configure a routing interface on the smartgroup group to enable Layer 3 forwarding of the smartgroup group.

The packet is sent to the inner ring interface after being encapsulated by the tunnel encapsulation module. The loopback packet is forwarded to the ECMP route in the routing and forwarding module. Therefore, the smartgroup is enabled with the Layer 3 function.

Step 3: The route forwarding module learns the ECMP route according to the dynamic routing protocol.

Step 4: When the tunnel encapsulation module receives the dynamic protocol or the static configuration, the egress is set to the inner ring interface. After the tunnel encapsulation module is encapsulated, the packet is sent to the inner ring interface and the packet is sent. The source MAC address is the address after the MAC offset is set.

Step 5: The packet is sent out from the inner ring interface, and then received from the inner ring interface. The route forwarding module queries the ECMP route to obtain multiple next hop IP addresses, and multiple forwarding ports corresponding to multiple next hop IP addresses will be used. The message is forwarded.

In this example, the three-layer forwarding of packets is shared from different ports, which can achieve the forwarding performance of multiple tunnels in the overlay network. In fact, only one tunnel in the overlay network is established (the tunnel exit is Inner ring mouth).

In other implementations, the method for implementing data transmission of other tunneling protocols by using the inner ring mode is similar to the present example, except that the encapsulation rules used by the tunnel encapsulating module to encapsulate the packet are different, for example, data transmission for the MPLS protocol, tunnel encapsulation. The module encapsulates the tunnel header based on the MPLS protocol, and the loopback processing and ECMP routing and forwarding are the same as this example.

Compared with the related art, the method and the device for transmitting data based on the tunnel are provided in the embodiment of the present disclosure. The technical solution of the embodiment of the present disclosure can implement multi-port forwarding in the scenario of the basic network application ECMP technology while reducing the overlay network device. The number of tunnel resources in the underlying chip.

Claims

A method for transmitting data based on a tunnel, comprising:

The tunnel is encapsulated in the overlay network, and the exit of the tunnel is set as a loopback interface.

In the basic network, the loopback of the packet encapsulated by the tunnel is performed on the loopback interface;

In the basic network, the ECMP routing table of the equivalent multipath routing protocol is obtained according to the destination Internet Protocol IP address of the packet encapsulated by the tunnel, and multiple next hop IP addresses are obtained, and the The packet encapsulated by the tunnel is forwarded through multiple forwarding ports corresponding to the multiple next hop IP addresses.
The method of claim 1, before the setting of the exit of the tunnel as a loopback, further comprising:

Establishing an inner ring interface, and configuring a media access control MAC address offset for the inner ring port;

The MAC address offset is used to make the source MAC address and the destination MAC address of the packet sent by the inner ring interface different.
The method of claim 2 wherein:

The setting the outlet of the tunnel as a loopback includes: setting an exit of the tunnel as an inner ring mouth;

Looping back the packet encapsulated by the tunnel on the loopback interface, including:

Transmitting the packet encapsulated by the tunnel to the inner ring port and receiving it back from the inner ring port.
The method of claim 1, before the setting of the exit of the tunnel as a loopback, further comprising:

Establishing a first outer ring mouth and a second outer ring port, and directly connecting the first outer ring port and the second outer ring port;

Adding the first outer ring interface to the first virtual route forwarding instance VRF1, and adding the second outer ring port to the second virtual route forwarding instance VRF2;

Recording the statically configured or dynamically learned ECMP route in the routing table in the VRF2, and importing the ECMP route in the VRF2 into the VRF1;

And configuring a MAC address offset for the first outer ring interface, where the MAC address offset is used to make the source MAC address and the destination MAC address of the packet sent by the first outer ring interface different.
The method of claim 4 wherein:

Setting the outlet of the tunnel as a loopback port includes: setting an exit of the tunnel as a first outer ring mouth;

The loopback of the packet encapsulated by the tunnel on the loopback interface includes:

Transmitting the packet encapsulated by the tunnel to the first outer ring interface, and receiving the packet from the second outer ring port.
The method of any of claims 1-5, wherein the tunneling the packet comprises:

Decapsulating the packet by using an encapsulation rule corresponding to the service feature according to the service feature of the packet;

The service feature of the packet includes at least one of the following: a destination IP address of the packet, and a destination MAC address of the packet.
A device for transmitting data based on a tunnel, comprising:

The tunnel encapsulation module is configured to encapsulate the packet in the overlay network and set the exit of the tunnel as a loopback interface.

The loopback module is configured to perform loopback on the packet encapsulated by the tunnel in the loopback interface, and send the packet encapsulated by the tunnel to the route forwarding module.

The routing and forwarding module is configured to obtain multiple next hop IPs in the ECMP routing table of the equivalent multipath routing protocol according to the destination Internet Protocol IP address of the packet encapsulated by the tunnel in the basic network. The address is forwarded by the plurality of forwarding ports corresponding to the multiple next hop IP addresses.
The apparatus of claim 7 further comprising:

The first configuration module is configured to establish an inner ring interface, and configure a media access control MAC address offset for the inner ring port, where the MAC address offset is used to send the inner ring port The source MAC address and destination MAC address are different.
The apparatus of claim 8 wherein:

The tunnel encapsulation module is configured to set an exit of the tunnel as an inner ring port;

The loopback module is configured to send the packet encapsulated by the tunnel to the inner ring port, and receive the packet back from the inner ring port.
The apparatus of claim 7 further comprising:

The second configuration module is configured to establish a first outer ring mouth and a second outer ring port, and directly connect the first outer ring port and the second outer ring port; add the first outer ring port to the first a virtual routing forwarding instance VRF1, the second outer ring interface is added to the second virtual routing forwarding instance VRF2; the statically configured or dynamically learned ECMP routing is recorded in the routing table in the VRF2, and the VRF2 is The ECMP route is imported into the VRF1; the MAC address offset is configured for the first outer ring interface; wherein the MAC address offset is used to source the packet sent by the first outer ring interface The MAC address and destination MAC address are different.
The apparatus of claim 10 wherein:

The tunnel encapsulation module is configured to set an exit of the tunnel as a first outer ring mouth;

The loopback module is configured to send the packet encapsulated by the tunnel to the first outer ring interface, and receive the packet from the second outer ring port.
The device according to any one of claims 7 to 11, wherein the tunnel encapsulation module is configured to tunnel encapsulate the packet according to a service feature corresponding to the service feature according to a service feature of the packet;

The service feature of the packet includes at least one of the following: a destination IP address of the packet, and a destination MAC address of the packet.