WO2011120459A2

WO2011120459A2 - Message forwarding method, equipment and network device

Info

Publication number: WO2011120459A2
Application number: PCT/CN2011/073689
Authority: WO
Inventors: 於少峰; 任广涛; 龙志平
Original assignee: 华为技术有限公司
Priority date: 2011-05-05
Filing date: 2011-05-05
Publication date: 2011-10-06
Also published as: CN102217253B; WO2011120459A3; CN102217253A

Abstract

Embodiments of the present invention provide a message forwarding method, equipment and network device, wherein the message forwarding method includes the following steps: a layer 3 routing table is queried, according to the destination internet protocol (IP) address of a received message, to acquire the next-hop identification information; an address resolution protocol (ARP) table is queried, according to the next-hop identification information, to acquire the next-hop media access control (MAC) address corresponding to the next-hop identification information, wherein the ARP table is composed of the next-hop identification information and the next-hop MAC address corresponding to the next-hop identification information; a layer 2 forwarding table is queried, according to the next-hop MAC address, to acquire the exit port information corresponding to the next-hop MAC address; the message is forwarded out via the exit port corresponding to the exit port information. By applying the technical solution of the present invention to forward the message, the instantaneous busy problem of the device and the problem of the traffic interruption can be solved, wherein the problems are caused by that a large number of ARP Miss messages and ARP request messages are generated when the port switch in a virtual local area network (VLAN) occurs in the prior art. Therefore, the forwarding efficiency of the message is improved.

Description

Message forwarding method, device and network device

Technical field

The embodiments of the present invention relate to network communication technologies, and in particular, to a packet forwarding method, device, and network device. Background technique

An existing Layer 3 switch is configured to bind a physical port in the same virtual local area network (VLAN) to a virtual port (VLANIF) and configure an Internet Protocol (IP) address for the virtual port. Media Access Control (MAC) addresses are used to implement Layer 3 forwarding.

The VLANIF-based Layer 3 forwarding process is as follows: When receiving a packet, the forwarding module first searches the Layer 3 routing table according to the destination IP address of the packet, and obtains the outbound interface information and the next hop IP address corresponding to the destination IP address. The outbound interface information and the next hop IP address look up the Address Resolution Protocol (ARP) table, obtain the corresponding MAC address and the outbound port information, and forward the packet to the physical port corresponding to the outbound port information. The network device corresponding to the MAC address. If the forwarding module searches for the ARP table based on the outbound interface information and the next hop IP address, it does not match the corresponding MAC address and the outbound port information. The ARP loss (MISS) message is reported to the ARP module. The ARP module sends the ARP module to the VLANIF. All the physical ports send ARP request packets for ARP learning.

In the scenario of port backup in the port, when the primary port fails, the user switches to the standby port, and the Layer 3 switch deletes the ARP table on the primary port. In this case, when the forwarding module receives the packet, the ARP packet is sent to the ARP module because the ARP table cannot be found. The ARP module broadcasts an ARP request packet to all physical ports in the corresponding VLANIF. Perform ARP learning to establish an ARP table for storing the user's IP address, MAC address, and corresponding outgoing port information for the alternate port. In the process of implementing the present invention, the inventor has found that the prior art has at least the following disadvantages: When there are many users on the primary port, a large number of ARP Miss messages and a large number of ARP request messages are generated, which will cause the device to be very busy in an instant, and During the ARP learning process, traffic is interrupted, which reduces the efficiency of packet forwarding. Summary of the invention

The embodiments of the present invention provide a packet forwarding method, a device, and a network device, which are used to solve the problem that the device is busy and the traffic is interrupted when the primary port and the standby port are switched in the prior art, and the efficiency of packet forwarding is improved.

The embodiment of the invention provides a packet forwarding method, including:

Querying the Layer 3 routing table according to the destination Internet Protocol IP address of the received message, and obtaining the next hop identification information;

Querying an address resolution protocol ARP table according to the next hop identifier information, and acquiring a next hop media access control MAC address corresponding to the next hop identifier information, where the ARP table is configured by the next hop identifier information and the The next hop MAC address corresponding to the next hop identification information is composed;

Querying the Layer 2 forwarding table according to the next hop MAC address, and obtaining the outbound port information corresponding to the next hop MAC address;

And forwarding the packet from the egress port corresponding to the egress port information.

The embodiment of the invention provides a message forwarding device, which includes:

The first obtaining module is configured to query the Layer 3 routing table according to the destination Internet Protocol IP address of the received packet, and obtain the next hop identification information;

a second obtaining module, configured to query an address resolution protocol ARP table according to the next hop identifier information, and obtain a next hop media access control MAC address corresponding to the next hop identifier information, where the ARP table is The first hop MAC address is configured by the next hop MAC address, and the third hopping module is configured to query the layer 2 forwarding table according to the next hop MAC address to obtain the next hop MAC address. Corresponding outgoing port information; The forwarding module is configured to forward the packet from the egress port corresponding to the egress port information. The embodiment of the invention provides a network device, which includes the packet forwarding device provided by the embodiment of the invention. The packet forwarding method, the device, and the network device in the embodiment of the present invention use the destination IP address of the received packet to query the Layer 3 routing table to obtain the next hop identification information, and then query the next hop identification information according to the next hop identification information. The ARP table consisting of the next hop MAC address corresponding to the hop information and the next hop identifier information, obtains the corresponding MAC address, and then queries the Layer 2 forwarding table according to the obtained MAC address, and obtains the location from the Layer 2 forwarding table. The technical solution of forwarding the packet from the outbound port of the MAC address, and the ARP table includes only the next hop identification information and the corresponding MAC address, and no longer includes the MAC address corresponding to the MAC address. When the port is switched, the ARP learning is not required. The learning of the Layer 2 forwarding table is used to update the correspondence between the MAC address and the outgoing port information. This solves the problem of generating a large number of ARP Miss reports when the port is switched. The message and the ARP request packet cause the device to be busy and the traffic is interrupted in an instant, which improves the forwarding efficiency of the packet. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a flowchart of a packet forwarding method according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a packet forwarding apparatus according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a packet forwarding apparatus according to another embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. Based on the present invention All other embodiments obtained by those skilled in the art without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of a packet forwarding method according to an embodiment of the present invention. As shown in FIG. 1, the method of this embodiment includes:

Step 11: Query the Layer 3 routing table according to the destination IP address of the received packet to obtain the next hop identification information.

When other devices on the network send packets to the Layer 3 switch, they will carry the IP address information (source IP address and destination IP address) in the packets to be forwarded by the Layer 3 switch. The Layer 3 switch performs Layer 3 forwarding based on the Layer 3 routing table stored therein. The Layer 3 routing table stores the destination IP address and the next hop identification information corresponding to the destination IP address. The next hop identification information in this embodiment is mainly the information of the outbound interface corresponding to the destination IP address and the next hop IP address of the outbound interface of the route. The outbound interface information includes the outbound interface type and the outbound interface index. When the outbound interface is the physical port of the VLANIF, the outbound interface is VLANIF, and the outbound interface index is the VLANIF ID of the VLANIF. For example, if the VLANIF corresponding to VLAN 100 is created, the outbound interface index corresponding to VLANIF is VLAN 100.

The Layer 3 switch parses the packet and obtains the destination IP address of the packet. The Layer 3 routing table is queried with the destination IP address of the packet. If the IP address of the same IP address is found in the Layer 3 routing table, The next hop identification information corresponding to the IP address with the same destination IP address.

If the local Layer 3 switch is the last hop of the received packet, that is, the destination IP address of the packet is the IP address of a physical port of the Layer 3 switch, the next hop identification information is obtained. The lieutenant will not include the next hop IP address, but only the routing outbound interface information. If the local Layer 3 switch is not the last hop, the obtained next hop identification information includes both the outbound interface information and the next hop IP address.

In this embodiment, the physical interface of the outbound interface is the VLANIF identifier, which is the VLAN ID corresponding to the VLANIF.

Step 12: Query the ARP table according to the next hop identification information, and obtain the information corresponding to the next hop identification information. a next hop MAC address, where the ARP table is composed of the next hop identification information and the next if mega MAC address corresponding to the next hop identification information;

The next hop MAC address refers to the MAC address of the physical device corresponding to the next hop IP address. In this embodiment, the ARP table is composed of the next hop identification information and a corresponding next hop MAC address. That is, when the next hop identification information includes the next hop IP address, the ARP table includes only the corresponding information of the outbound interface information, the next hop IP address, and the next hop MAC address; and the next hop identification information does not include the next hop IP address. At the address, the ARP table only includes the outbound interface information, the IP address of a physical port on the Layer 3 switch (that is, the destination IP address of the port), and the MAC address of the device directly connected to the physical port.

Specifically, when the next hop identification information includes the outbound interface identifier (such as the VLANIF identifier) and the next hop IP address, the Layer 3 switch specifically searches for the ARP table by using the outbound interface identifier (and the next hop IP address). The MAC address (that is, the next hop MAC address) of the entry in the ARP table that matches the route outbound interface identifier and the next hop IP address. The next hop MAC address can uniquely identify the next message received. A physical device.

When the next hop identification information includes only the outbound interface identifier and the next hop IP address, the Layer 3 switch queries the ARP table with the outgoing interface identifier and the destination IP address in the packet, and obtains the route and the route in the ARP table. The MAC address (that is, the next hop MAC address) in the entry that matches the destination IP address and the destination IP address in the packet. At this time, the physical device corresponding to the next hop MAC address is directly connected to the Layer 3 switch through the physical port corresponding to the outbound interface identifier, and is the final receiver of the packet.

Step 13. Query the Layer 2 forwarding table according to the next hop MAC address, and obtain the outbound port corresponding to the next hop MAC address.

In this embodiment, after the ARP table does not store the port information of the network device corresponding to the next hop MAC address and the Layer 3 switch, the Layer 3 switch obtains the next hop MAC address after querying the ARP table. The Layer 2 forwarding table is further queried according to the obtained next hop MAC address, to obtain the port information corresponding to the next hop MAC address (that is, the outbound port information).

A Layer 2 forwarding table is also stored on the Layer 3 switch, and the Layer 2 forwarding table stores three layers. The port information of the switch and the MAC address of the network device connected to each physical port are used by the Layer 3 switch for Layer 2 forwarding. Specifically, the Layer 3 switch uses the obtained next hop MAC address as an input to query the Layer 2 forwarding table, and obtains the port information corresponding to the MAC address of the Layer 2 forwarding table that is the same as the next hop MAC address.

Step 14: Forward the packet from the egress port corresponding to the egress port information.

After obtaining the egress port corresponding to the next hop MAC address, the Layer 3 switch forwards the packet from the egress port, that is, forwards the packet to the network device corresponding to the next hop MAC address.

In the packet forwarding method of the embodiment, the Layer 3 switch first searches the Layer 3 routing table according to the destination IP address of the packet, obtains the next hop identification information, and then queries the ARP table according to the next hop identification information to obtain the next hop MAC address. Then, the device searches for the Layer 2 forwarding table according to the obtained next hop MAC address, obtains the egress port, and forwards the packet through the egress port, so that the ARP table can include only the next hop identification information and the corresponding MAC address, and no longer includes The port information corresponding to the MAC address. Therefore, when intra-VLAN port switching occurs, ARP learning is not required. The learning of the MAC address and port information can be updated by learning the Layer 2 forwarding table. The switch has a large number of ARP Miss packets and ARP request packets, which causes the Layer 3 switch to be busy and interrupted. This improves the forwarding efficiency of packets.

Based on the foregoing embodiment, when the VLAN supports port backup, the primary port and the backup port are switched, and the network device connected to the primary port is connected to the Layer 3 switch through another physical port (backup port). The switch between the switch and the network device has been switched. The outbound interface before and after the switch belongs to the same VLAN. Therefore, the mapping between the VLANIF identifier and the MAC address does not change. The ARP table in this embodiment only includes the VLANIF identifier, the next hop IP address, and the next hop. The correspondence between the MAC addresses and the port information is not included. Therefore, the information in the ARP table does not change when the egress port is switched. The ARP Miss message and the large number of ARP requests are not generated. The packet is used to reduce the load on the Layer 3 switch. In addition, the ARP learning does not cause traffic interruption caused by ARP learning, which improves the efficiency and quality of forwarding packets. Further, for a Layer 3 switch, when receiving a packet, the Layer 3 switch establishes a physical port by obtaining the physical MAC address used to receive the packet and parsing the received packet to obtain the source MAC address. The correspondence between the MAC addresses of the network devices connected to the physical ports to form a Layer 2 forwarding table. In addition, the Layer 3 switch dynamically updates the Layer 2 forwarding table according to the actual usage of its physical ports. The update process is the same as the process of forming the Layer 2 forwarding table. Therefore, when a port switch in a VLAN occurs, the Layer 3 switch learns that the physical port is switched according to the received packet, and updates the Layer 2 forwarding table according to the switched physical port, that is, the MAC address corresponding to the original port. The corresponding port information is updated to the outbound port after the switch; the updated Layer 2 forwarding table stores the correspondence between the information of the outbound port and the MAC address corresponding to the original port. Since the Layer 2 forwarding table on the Layer 3 switch is usually maintained by a dedicated hardware module, its update speed is relatively fast.

Based on the above, when the port is switched, when the Layer 3 switch queries the Layer 2 forwarding table to perform Layer 2 forwarding according to the MAC address obtained by querying the ARP table, the Layer 3 switch can obtain the correct outgoing port. The outbound port ensures that packets are forwarded through the correct outbound interface, which ensures that packets are successfully forwarded.

In the above embodiments, before the next hop MAC address corresponding to the next hop identification information is obtained by querying the ARP table according to the next hop identification information, the method further includes: generating an ARP table according to the received ARP response message. . Specifically, when receiving the first packet, the Layer 3 switch generates an ARP request packet according to the destination IP address of the first packet, and broadcasts on the physical port of the corresponding VLANIF according to the VLAN value carried in the packet. The ARP request packet; after receiving the ARP request packet, the other network device in the same VLAN that is connected to the Layer 3 switch in the network determines whether the IP address of the device is the same as the IP address used for the MAC address in the ARP request packet. If they are not the same, they do not respond. If they are the same, they send an ARP response packet to the Layer 3 switch. The ARP response packet carries the IP address and MAC address of the network device. After receiving the ARP response packet, the Layer 3 switch receives the information of the outgoing interface of the ARP response packet, that is, the VLAN ID and VLANIF type of the VLANIF, and the IP address and MAC address of the network device in the ARP response packet. Store to form ARP table. The information of the outbound interface and the IP address of the network device are used as the next hop identification information, and the MAC address of the network device is used as the next hop MAC address.

It can be seen from the above analysis that in the ARP learning process, the Layer 3 switch learns only the information of the egress port to the VLANIF layer, instead of learning the specific physical port, and realizes the separation between the ARP table and the physical port. The device does not need to perform ARP learning when the intra-VLAN port is switched. The queried ARP is used to obtain the next hop MAC address. Then, the Layer 2 forwarding table is used to find the egress port according to the obtained next hop MAC address.

The packet forwarding method in this embodiment first searches for the Layer 3 routing table to obtain the next hop identification information, queries the ARP table according to the next hop identification information, and obtains the next hop MAC address, and then searches for the second layer according to the next hop MAC address. The message is forwarded to the Layer 2 forwarding module by the Layer 3 forwarding module. The Layer 2 forwarding module forwards the packet based on the obtained egress port. The Layer 3 forwarding and Layer 2 forwarding are combined to successfully forward the packet. At the same time, the ARP table is separated from the physical port information, and ARP learning is not required when the intra-VLAN port is switched. This solves the problem that a large number of ARP Miss messages and a large number of ARP request packets are generated due to intra-VLAN port switching. The three-layer switch is very busy and the traffic is interrupted, which improves the success rate of packet forwarding.

FIG. 2 is a schematic structural diagram of a packet forwarding apparatus according to an embodiment of the present invention. As shown in FIG. 2, the apparatus in this embodiment includes: a first acquiring module 21, a second obtaining module 22, a third obtaining module 23, and a forwarding module 24.

The first obtaining module 21 is configured to query the Layer 3 routing table according to the destination IP address of the received packet to obtain the next hop identification information. The destination IP address and destination are stored in the Layer 3 routing table in this embodiment. The next hop identification information corresponding to the IP address; the next hop identification information is the information of the outbound interface corresponding to the destination IP address and the next hop IP address of the outbound interface of the route. The information of the outbound interface includes the outbound interface type and Outbound interface index. The second hop block 22 is connected to the first hop module 21, and is configured to query the ARP table according to the next hop identification information acquired by the first obtaining module 21, and obtain a next hop MAC corresponding to the next hop identifier information. The ARP table in this embodiment is composed of the next hop identification information and the next hop MAC address corresponding to the next hop identification information. The third obtaining module 23 is connected to the second obtaining module 22, The second layer forwarding table is used to query the second-layer forwarding table according to the next hop MAC address obtained by the second obtaining module 22, and obtain the outbound port information corresponding to the next hop MAC address. The forwarding module 24 is connected to the third obtaining module 23, and is configured to forward the outbound port corresponding to the outbound port information obtained by the third obtaining block 23 from the packet.

The foregoing function module of the packet forwarding device in this embodiment can be used to perform the process of the packet forwarding method provided in the foregoing embodiment. The working principle is not described here. For details, refer to the description of the method embodiment.

The packet forwarding device of the present embodiment obtains the next hop identification information by using the first acquiring module to query the Layer 3 routing table, and the second obtaining module queries the AP table to obtain the next hop MAC address, and then queries the second layer through the third obtaining module. The forwarding table obtains the egress port, and the forwarding module forwards the packet from the egress port, so that the ARP table can include only the next hop identification information and the corresponding MAC address, and no longer includes the port information corresponding to the MAC address, therefore, When the intra-VLAN port switching occurs, the packet forwarding device in this embodiment does not need to perform ARP learning when forwarding packets. The learning of the Layer 2 forwarding table can be used to update the correspondence between the MAC address and the port information. When a port in a VLAN is switched, a large number of ARP Miss packets and ARP request packets are generated, causing the Layer 3 switch to be busy and interrupted. This improves the forwarding efficiency of packets.

FIG. 3 is a schematic structural diagram of a packet forwarding apparatus according to another embodiment of the present invention. The embodiment is implemented based on the embodiment shown in FIG. 2. As shown in FIG. 3, the apparatus of this embodiment further includes: a generating module 31.

The generating module 31 is configured to generate an ARP table according to the received ARP response packet before the second obtaining module 22 queries the ARP table. Specifically, the packet forwarding device generates an ARP request packet according to the first packet received, and broadcasts the generated ARP request packet to all the physical ports in the VLAN where the packet is sent. The ARP request packet is received. The network device determines whether the IP address of the requesting MAC address in the ARP request packet is the same as the IP address of the ARP request packet, and determines that the same network device generates an ARP response packet including the IP address and the MAC address and sends the packet to the packet forwarding. The device is specifically sent to the generating module 31 in the message forwarding device. The generating module 31 is configured to receive the information of the routing interface of the ARP response packet. For example, if the outbound interface is a VLANIF, the outbound interface information mainly refers to the VLAN value corresponding to the VALNIF (that is, the VLANIF identifier) and the VLANIF type. The IP address and MAC address of the device are stored to form an ARP table. Further, the message forwarding device of this embodiment further includes: an update module 32. The update module 32 is configured to update the port information corresponding to the next hop MAC address in the Layer 2 forwarding table to be the switched out port when the egress port is switched. Specifically, the update module 32 can obtain the physical port connected to the physical port and the physical port by obtaining the physical port used to receive the packet and parsing the source MAC address in the received packet when receiving the packet. The correspondence between the MAC addresses is generated or updated according to the obtained correspondence. If the physical port corresponding to the obtained MAC address is different from that stored in the Layer 2 forwarding table, the port information corresponding to the MAC address in the Layer 2 forwarding table is changed to the information of the newly acquired physical port.

The packet forwarding device in this embodiment may be the last hop or not the last hop of the received packet. If the packet forwarding device in this embodiment is the last hop of the packet, the next hop identification information acquired by the first obtaining module 21 does not include the next hop IP address, but only the routing outbound interface information (mainly If the packet forwarding device of the present embodiment is not the last hop of the packet, the next hop identification information acquired by the first obtaining module 21 includes the outbound interface information (mainly The route outbound interface identifier and the next hop IP address.

Based on the above, the embodiment provides an implementation structure of the second obtaining module 22. Second acquisition module

22 includes: a first acquisition unit 221 and a second acquisition unit 222. If the outbound interface is the VLANIF as an example, the second obtaining module 22 works as follows: When the next hop identification information acquired by the first obtaining module 21 includes the VLANIF identifier and the next hop IP address, the first acquiring unit 221 The VLANIF identifier and the next hop IP address are used as input parameters to query the ARP table to obtain the next hop MAC address. When the next hop identification information acquired by the first obtaining module 21 does not include the next hop IP address, the second acquisition is performed. The unit 222 uses the VLANIF identifier and the destination IP address in the packet as input parameters to query the ARP table to obtain the next hop MAC address.

The foregoing various functional modules or units of the packet forwarding device in this embodiment may be used to perform the corresponding processes in the packet forwarding method provided in the foregoing embodiment, and the working principle is not described herein.

The packet forwarding device in this embodiment may be a network device having a packet forwarding function, such as a Layer 3 switch. The first obtaining module 21, the second obtaining module 22, and the generating module in the packet forwarding device of this embodiment The block 31 is mainly processed based on the layer 3 routing table, and can be divided into three layers of function modules; and the third obtaining module 23, the forwarding module 24, and the updating module 32 are mainly processed based on the layer 2 forwarding table, which can be divided into The second layer of functional modules. In summary, the packet forwarding device of the present embodiment first searches for the Layer 3 routing table to obtain the next hop identification information by using the foregoing function module or unit, and queries the ARP table according to the next hop identification information to obtain the next hop MAC address. Then, the Layer 2 forwarding table is searched according to the next hop MAC address, and the packet is forwarded by the Layer 3 function module to the Layer 2 function module, and then the Layer 2 function module forwards the packet according to the obtained egress port, and forwards the Layer 3 packet. Layer 2 forwarding is combined. When the packets are forwarded successfully, the ARP table is separated from the physical port information. ARP learning is not required when the intra-VLAN port is switched. This solves the problem of VLAN switching in the prior art. A large number of ARP Miss messages and a large number of ARP request packets cause the Layer 3 switch to be busy and interrupted. This improves the success rate of packet forwarding.

An embodiment of the present invention provides a network device, where the network device includes a packet forwarding device. For the description of the working process of the packet forwarding device, refer to the description of the embodiment shown in FIG. 1. For the structure, refer to the description of the embodiment shown in FIG. 2 and FIG. 3, and details are not described herein again.

The network device in this embodiment may be a Layer 3 switch, etc., and may use the process of the packet forwarding method provided by the foregoing method to forward the packet, which solves the problem that a large number of ARP Miss messages are generated due to port switching in the VLAN. The problem that the Layer 3 switch is busy and the traffic is interrupted due to a large number of ARP request packets improves the success rate of packet forwarding.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A packet forwarding method, which is characterized by:

The Layer 3 routing table is queried according to the destination Internet Protocol IP address of the received message, and the next hop identification information is obtained.

Querying the address resolution protocol ARP table according to the next hop identification information, and acquiring a next hop media access control MAC address corresponding to the next hop identification information, where the ARP table is configured by the next hop identification information and the The next hop MAC address corresponding to the next hop identification information is composed;

The packet forwarding method according to claim 1, wherein the querying the ARP table according to the next hop identification information, and acquiring the next hop MAC address corresponding to the next hop identification information includes:

When the next hop identification information includes the outbound interface identifier and the next hop IP address, the ARP table is queried according to the route outbound interface identifier and the next hop IP address, and the next hop MAC address is obtained. ;

When the next hop identification information does not include the next hop IP address, the ARP table is queried according to the route outbound interface identifier and the destination IP address, and the next hop MAC address is obtained.

The packet forwarding method according to claim 1, wherein the querying the ARP table according to the next hop identification information to obtain the next hop MAC address corresponding to the next hop identification information includes:

The ARP table is generated according to the received ARP response packet.

The packet forwarding method according to any one of claims 1-3, further comprising: updating the next hop MAC address in the layer 2 forwarding table when the egress port is switched The corresponding port information is the outgoing port information after the switch.

5. A message forwarding device, comprising: The first obtaining module is configured to query the Layer 3 routing table according to the destination Internet Protocol IP address of the received packet, and obtain the next hop identification information;

a second obtaining module, configured to query an address resolution protocol ARP table according to the next hop identifier information, and obtain a next hop media access control MAC address corresponding to the next hop identifier information, where the ARP table is The first hop MAC address is configured by the next hop MAC address, and the third hopping module is configured to query the layer 2 forwarding table according to the next hop MAC address to obtain the next hop MAC address. Corresponding outgoing port information;

The forwarding module is configured to forward the packet from the egress port corresponding to the egress port information.

The message forwarding device according to claim 5, wherein the second obtaining module comprises: a first acquiring unit, configured to: in the next hop identification information, a route outbound interface identifier and a next hop

The IP address is obtained by querying the ARP table according to the route outbound interface identifier and the next hop IP address, and acquiring the next hop MAC address.

a second obtaining unit, configured to: when the next hop identification information does not include the next hop IP address, query the ARP table according to the route outbound interface identifier and the destination IP address, and obtain the next next Jump the MAC address.

The message forwarding device according to claim 5, further comprising:

And a generating module, configured to generate the ARP table according to the received ARP response packet.

The message forwarding device according to any one of claims 5-7, further comprising: an update module, configured to update the layer 2 forwarding table when the egress port is switched The port information corresponding to the next hop MAC address is the outbound port information after the switch.

A network device, comprising the message forwarding device according to any one of claims 5-8.