KR100624475B1 - Network Element and Packet Forwarding Method thereof - Google Patents

Abstract

According to the present invention, IP (Internet Protocol) packet data between a LAN (Local Area Network) and a Wide Area Network (WAN) in a Switch Router or a Multi Service Router, which is a network equipment, A network component and a packet forwarding method for transmitting correctly. This network component is connected to a local area network (LAN), a wide area network (WAN), and an address resolution server, and receives a MAC (Media Access Control) address for each destination IP address from the address resolution server to form an L3 forwarding table. A MAC address is generated in the IP packet received from the LAN with reference to the L3 forwarding table, and a WAN forwarding table including an L3 switch module for transmitting to the CPU and a MAC address for each WAN port is generated. It includes a CPU for transmitting an IP packet received from the L3 switch module to a corresponding WAN port by referring to a forwarding table. As a result, the IP transmission speed can be increased while guaranteeing the quality of service (QoS), and the main CPU overload in the equipment is reduced, which enables other functions to be operated during CPU idle time, which is relatively cost effective. Bring.

Switch Router, LAN, WAN, Proxy, ARP, MAC, Forwarding, Table, IP

Description

Network element and packet forwarding method

Figure 1a is a network consisting of a typical router and WAN Aggregator,

Figure 1b is a network consisting of a typical router and switch,

2 is a diagram illustrating a general multiservice switch router,

3 is an internal block diagram showing a network component between a LAN and a WAN composed of a L3 switch and a CUP according to the prior art;

FIG. 4 is a diagram illustrating a data processing process between a LAN and a WAN in FIG. 3.

5 is a diagram illustrating a logical configuration of a packet forwarding method of a network component between a LAN and a WAN according to the prior art;

6 is a S / W logical block diagram of a packet forwarding method of a network component between a LAN and a WAN according to the present invention;

7 is a view for explaining the operation of the Proxy ARP in the packet forwarding method of the network component between the LAN and WAN according to the present invention,

8 is a diagram illustrating a data packet processing in a packet forwarding method of a network component between a LAN and a WAN according to the present invention;

9 is a diagram illustrating a data packet processing procedure according to another embodiment in a packet forwarding method of a network component between a LAN and a WAN according to the present invention.

-Explanation of the symbols according to the main parts of the drawings-

10; L3 switch 11; LAN Device Driver

12; IP layer 13; Data Link Layer

14; WAN Device Driver

20; CPU 30; WAN Module

100; Proxy ARP

The present invention relates to a network component and a packet forwarding method, and more particularly, to a local area network (LAN) and a wide area network (WAN) in a switch router or a multi service router, which is a network device. The present invention relates to a network component and a packet forwarding method for quickly and accurately transmitting Internet Protocol (IP) packet data.

In general, network equipment has various forms and functions thereof, depending on where the network equipment is used in a wide area (hereinafter referred to as WAN) or region (hereinafter referred to as LAN). In particular, at the junction between the LAN area and the WAN area, as shown in FIGS. 1A and 1B, router equipment and a WAN area that provide a routing function for accessing data required through a general LAN area are provided. IP packet data can be efficiently transmitted only when a switch device in which a required data is connected to a terminal or another internal network is interfaced. Here, FIG. 1A is a network composed of a general router and a WAN aggregator, and FIG. 1B is a network composed of a general router and a switch.

When looking at the function of a router, IP packet data is delivered to a destination, and a route that passes when IP packet data is delivered to a destination is called a route or a path.

The router exchanges information about a route with an adjacent router in order to deliver IP packet data to a destination. The exchanged information is called route information or routing information, and the exchange of route information is called routing information exchange or advertising. The protocol used to exchange routing information is called RP (Routing Protocol). Based on the route information, the optimal route is selected from the various routes to the destination. The optimal route is called Best Path or Best Route, and the process of selecting the optimal route is called Route Determination. .

And, we select the best route for each destination and have it in the form of table, and this table is created in the form of Routing Table or Forwarding Table. The forwarding table usually specifies the destination address, the interface of the router going to the route, or the IP address assigned to it.

Therefore, when IP packet data is delivered, the router refers to the network IP address of the IP packet data, finds a gateway to the address, and delivers the IP packet data to the corresponding gateway.

A switch is also a network device that selects a path or line to send unit data to the next destination. The switch may also include a router function, which is a device that can determine the route, or, more specifically, where data should be sent to adjacent network points. In general, a switch is a much simpler and faster device than a router that requires knowledge of how to determine the network and route.

Switches are usually associated with two layers, or datalink layers, in the OSI reference model. However, some newer switches perform the routing function of the three-layer network layer, which is often called an IP switch.

In large broadband networks, moving from one switch to another in the network is called a hop. The time it takes for the switch to find out where to send IP packet data is called "latency". Switches are commonly used at the backbone or gateway layer, where one network is connected to another, and at the subnetwork layer close to the destination or source where data is being delivered.

In addition to the connection between the router and the switch, an IP packet data can be efficiently transmitted by an equipment (aggregator or multiplexer) that collects data in a WAN area or a LAN area into a single port.

There is a disadvantage in that it is economically expensive to build such equipment in a small company or building, as shown in FIG. 2 while many other equipment is oriented to various services (Multi-service switch) Router type devices are being developed. In other words, the direction of the development can be estimated in advance in terms of the multi-function that enables the service of multiple equipment in one equipment. 2 is a diagram illustrating a general multiservice switch router.

It is important that such equipment be able to perform a high number of services efficiently. In order to process the service data in various ways, the processing power in the equipment is very important, and the software and processing algorithms that process flexibly become more important.

3 is an internal block diagram illustrating a data processing apparatus between a LAN and a WAN configured by a L3 switch and a CUP according to the prior art, and FIG. 4 is a diagram illustrating a logical configuration of a data processing method between the LAN and the WAN according to the prior art. FIG. 5 is a diagram illustrating a data processing process between a LAN and a WAN in FIG. 3.

As shown in FIG. 3, a software and processing algorithm for flexibly processing data by improving data processing capability between a LAN area and a WAN area in one device include an L3 switch chip for processing LAN data. or a module (hereinafter referred to as L3 switch) 10, a WAN module 30 for processing WAN data through a broadband network, and a processor 20 for processing data from the LAN to the WAN while processing various functions. You will need A processor is a network processor that controls a network and generally uses a CPU. All data between LANs are processed by the L3 switch 10, but the data related to the WAN is always the CPU 20 involved in data processing.

In the prior art as described above, when LAN data is transferred to the WAN, the L3 switch 10 and the CPU 20 both require a procedure for processing the forwarding table, thereby reducing the overall processing speed and performance of the system. Transfer between LAN data is handled by L3 switch 10 which is a dedicated H / W chip, and transfer between WAN data is performed by CPU 20 once to perform all forwarding table procedure of L3 switch 10 to the desired IP address. Process.

Therefore, data between the LAN and the WAN requires a forwarding table retrieval procedure at the L3 switch 10 and the CPU 20, respectively, which imposes a burden on data processing on the CPU 20, and increases data throughput. Losing problems occur. For example, since the L3 switch 10 is a hardware dedicated to forwarding table search or data transfer, there is no problem, but the CPU 20 must process not only data but also management and control data of the entire system. There is a lot of data, so the processing of these data packets can be a huge burden.

For example, as shown in FIG. 4, data processing between a LAN and a WAN is as follows. Suppose some data comes from the LAN and the destination address is 10.10.10.10, which must go out towards the WAN Module 30 towards the WAN.

A forwarding table is generated in the CPU 20, and the WAN port to the next hop is designated for each destination IP network. The L3 switch 10 receives and stores a forwarding table arranged from the CPU 20, and is configured to connect all data to the WAN module 30 to a port connected to the CPU 20. In this example, all data going to the 10.10 / 16 network goes to the WAN Module 30 and thus to the CPU 20 port.

The MAC table of the L3 switch 10 can be assigned a MAC address for each output port. With respect to the data going out to the CPU 20, the MAC address of the CPU 20 interface can be set as the destination MAC address of the output port.

In other words,

Data of the destination IP address 10.10.10.10 from the LAN to LAN port # 01 is input to the L3 switch 10. The L3 switch 10 sees that the IP address 10.10.10.10 is the destination, and finds which port to go to, and finds the corresponding port from the forwarding table (F1) to the CPU 20 in the Longest Prefix Match (LPM) manner.

In addition, the L3 switch 10 finds that all data of the destination IP address 10.10.XX / 16 network according to the forwarding table (F1) should go to the physical port # 0, and the MAC address of the port corresponding to the destination is determined. It is determined that the forwarding table (F2) is 00: 00: F0: 01: 00: 0A. Then, the data inputted to the physical port # 0 of the CPU 20 is transmitted using the MAC address as the destination MAC address.

The CPU 20 receives the corresponding data transmitted, checks whether the destination MAC address is registered in its input port, and if so, transmits the data to the IP layer 12. The IP layer 12 detects that the destination IP address is 10.10.10.10 and searches for Longest Prefix Match (LPM) by the Forwarding Table (F3) of the L3 switch 10. The final destination WAN IP address is 10.10.10.X. You can see that it is a / 24 network. Then, the CPU 20 finds that the next hop is connected to the WAN # 01 via the Data Link Layer 13, and sends it to the WAN Module 30 corresponding to the WAN # 01 interface. Then, the WAN module 30 performs a transmission procedure for outgoing to WAN # 01 and then transmits the corresponding data.

Accordingly, as shown in FIG. 5, the LAN device driver 11 searches for a forwarding table to receive data transmitted from the LAN to the WAN and delivers the data to the IP layer, and the CPU 20 searches the MAC address of the data packet. If the size of the forwarding table handled by the destination-specific L3 switch 10 increases, it finds the next-hop by searching based on the destination IP address. However, since the time taken to find out the output port of the corresponding WAN device driver 14 acts as a significant burden, there is a problem of providing a fatal effect on the overall processing speed. The description of the Data Link Layer 13 is omitted.

In particular, this series of retrieval operations are driven by software in the CPU 20, which requires a lot of processing power due to the large amount of memory reads, and higher processing power because the data packets must be processed continuously in large quantities. This is necessary. In addition, if a lot of small size data is suddenly inputted, it must be processed one by one. Therefore, there is a high possibility of delay in data transmission, which may have a serious effect on the data packets of voice or video that must be urgently transmitted. Have.

The present invention has been made to solve the above problems, when the packet data is transmitted between the LAN and WAN to reduce the data processing burden of the CPU by the fast forwarding of the data to improve the performance of the system, accordingly It is an object of the present invention to provide a network component and a packet forwarding method capable of performing almost the same functions as a high-performance CPU even when a low-performance CPU is applied.

According to the present invention, a network element connected to a local area network (LAN), a wide area network (WAN), and an addressing server according to the present invention may include a media access control (MAC) address for each destination IP address from the addressing server. L3 forwarding table that generates L3 forwarding table, assigns MAC address to IP packet received from LAN by referring to L3 forwarding table, transmits to CPU, and WAN forwarding including MAC address of each WAN port. A network component including a CPU generating a table and transmitting an IP packet received from the L3 switch module to a corresponding WAN port with reference to the WAN Forwarding Table.

In addition, the L3 forwarding table preferably further includes a logical interface field. The WAN Forwarding Table preferably further includes a logical interface field. The address resolution server is preferably an ARP (Address Resolution Protocol) server or RARP (Reverse ~). Preferably, the network component is a switch router.

The CPU has a table in which a WAN device driver corresponding to the MAC address can be found, and the table adds at least one item for processing a specific service of QoS and tunneling before a data packet is transmitted to the device driver. It is desirable to be able to.

The L3 forwarding table may add items grouped by destination IP address, source IP address, protocol type, destination port number, and source port number.

According to another aspect of the present invention, in the forwarding method of a network component connected to a local area network (LAN), a wide area network (WAN), and an address resolution server, the MAC for each destination IP address from the address resolution server ( Receive Media Access Control) address and generate L3 forwarding table, assign MAC address to IP packet received from LAN with reference to L3 forwarding table, transmit to CPU, and MAC address for each WAN port. Generating a WAN forwarding table, and transmitting an IP packet received from the L3 switch module to a corresponding WAN port by referring to the WAN forwarding table.

In addition, the L3 forwarding table preferably further includes a logical interface field. The WAN Forwarding Table preferably further includes a logical interface field. The address resolution server is preferably an ARP (Address Resolution Protocol) server or RARP (Reverse ~). Preferably, the network component is a switch router.

The L3 forwarding table may add items grouped by destination IP address, source IP address, protocol type, destination port number, and source port number.

In addition, the CPU has a table that can find the WAN device driver corresponding to the MAC address, the table adds at least one item for processing a specific service of QoS, Tunneling before the data packet is transmitted to the device driver It is desirable to be able to.

Hereinafter, a network component and a packet forwarding method according to the present invention will be described in detail with reference to the accompanying drawings.

6 is a S / W logical block diagram of a packet forwarding method of a network component between a LAN and a WAN according to the present invention, and FIG. 7 is a block diagram of Proxy ARP in the packet forwarding method of a network component between a LAN and a WAN according to the present invention. It is a figure for demonstrating operation | movement.

The network component of the present invention is the same as the internal block diagram showing a data processing device between a LAN and a WAN composed of the L3 switch 10, the CPU 20, and the WAN Module 30 according to the prior art of FIG. As shown in FIG. 6, the configuration of the logical device of the S / W for the data processing method between the LAN and the WAN is referred to as Switch Proxy ARP (hereinafter referred to as 'Proxy ARP') 100 to change the MAC table configuration of the switch. Part is added so that the flow of data is directly connected using the MAC address of the WAN device driver corresponding to Layer 2 (data link layer) instead of the IP layer. Here, the Proxy ARP 100 resides on an ARP server (Address Resolution Protocol Server) (not shown) on the network.

Suppose you transfer data packets from LAN to WAN. The data packet is received by the corresponding LAN Device Driver 11 through the established port, and after performing the L3 switch 10 including the general router function and the Data Link layer 13 procedure according to the processor CPU 20, In the WAN module 30 in which a plurality of WAN device drivers corresponding to the WAN port are constructed, the WAN module 30 transmits the data toward the WAN network. In particular, in the Data Link layer 13 procedure, the L3 switch 10 replaces the operation to be performed in the CPU 20 with the internal ARP table included in the Proxy ARP 100. In this case, the ARP has a table that is able to find each address by establishing a relationship between an IP address and a MAC address, that is, a so-called ARP table (not shown).

As shown in FIG. 7, the Proxy ARP 100 belongs to a Proxy server (not shown) existing on the network, and performs a Data Link layer 13 procedure to perform a next hop corresponding to a WAN IP address as a final destination. Since the L3 switch 10 generates a forwarding table (P2) for finding a logical interface (Logical I / F) and MAC address, it replaces the main functions of the CPU 20.

The Forwarding Table (P2), which represents the logical interface corresponding to the destination (WAN) MAC address, which is the data link layer by the Proxy ARP (100), is an L3 that operates much of the hardware that needs to be done in the CPU 20. By enabling the switch 10 it is possible to ensure much faster performance and spare time of the CPU (20).

The CPU 20 simply generates a table P1 that finds the MAC address corresponding to each of the next hops on the WAN module 30 side and establishes the logical interface of the next hop, and the WAN module 30 corresponding to the MAC address. The data packet is transmitted through the WAN device driver 14 output port.

Accordingly, the forwarding table P2 is generated as a new table to form a logical interface of the next hop using the MAC address found in the table P1 of the CPU 20 and the Proxy ARP 100. At this time, if the WAN IP address query sent from the CPU 20 is given, the proxy ARP 100 responds to the corresponding MAC address.

Here, for convenience, a forwarding table (P2) for finding a logical interface (Logical I / F) and a MAC address of the next hop corresponding to the WAN IP address will be referred to as an L3 forwarding table (P2) with reference to the ARP table. Then, suppose that the table (P1) that establishes a logical interface on the WAN module 30 side and finds the MAC address corresponding to each of them is called the WAN Forwarding Table (P1).

The Proxy ARP 100 manages the L3 Forwarding Table (P2) by allocating a different MAC address corresponding to each output WAN interface or each logical interface of each interface and provides the table to the L3 switch 10. The L3 switch 10 may assign a different MAC address for each destination logical interface of the incoming data packet using the MAC address received from the CPU 20 while managing its own logical interface. Then, since the CPU 20 has already performed the L3 switch 10 to find and process the interface and MAC address through LPM search, only the MAC address is searched according to the WAN Forwarding Table (P1) to find the external WAN interface. Send the data packet. Here, the L3 forwarding table (P2) uses the Exact Match method, not the LPM method, and the size of the table (P2) corresponds to the number of logical WAN interfaces. In addition, since the first 3 bytes of the MAC address appearing in the L3 Forwarding Table (P2) are constant for each manufacturer, the first 3 bytes of the MAC address are determined by the manufacturer. It is shortened.

Proxy ARP 100 can be inferred from general ARP managing network with mapping table of IP address and MAC address. The Proxy ARP 100 is responsible for allocating and managing MAC addresses between the CPU 20 and the L3 switch 10. The L3 switch 10 assigns WAN MAC addresses by looking at the output interface of 3 bytes after the MAC address. do. It acts as a router rather than a host, and uses the next hop's MAC address as the destination MAC address to allocate multiple MAC addresses for each port going out to the CPU 20. At this time, it can be divided into logical interfaces and a unique MAC address can be assigned to each.

Therefore, the Proxy ARP 100 manages the L3 forwarding table (P2) related to the MAC address, so that LPM lookup for the existing WAN IP address is possible from the L3 switch 10 to the forwarding table (P3), and instead the CPU ( In 20), only the MAC address needs to be retrieved and exported.

For example, when the WAN Forwarding Table (P1) for the logical interface on the WAN network side is configured in the CPU 20, the Proxy ARP 100 constructs the L3 Forwarding Table (P2) and generates respective MAC addresses. Generation of MAC address is composed of three logical interfaces (WAN # 01, WAN # 02, WAN # 03) by L3 forwarding table (P2), and finds and assigns different MAC addresses to each. Here, the MAC address is configured with a unique value in the corresponding manufacturer, and the allocated 3byte is fixed by the manufacturer, so it can be allocated to the next 3byte. The fourth byte may mean a physical WAN interface, and the 5 and 6 bytes may mean a logical interface therein. The L3 forwarding table (P2) configured in this way is set in the L3 switch 10.

Then, the L3 switch 10 stores and stores the L3 forwarding table (P2) received from the Proxt ARP 100 in the output port connected to the CPU 20, and attaches a corresponding MAC address to the packet going to the CPU 20. Build to give. In this method, the L3 switch 10 should change the table according to the interface change of the CPU 20, but MAC running or Aging can be performed between the CPU 20 and the L3 switch 10 for the corresponding L3 forwarding table (P2). There is no need at all.

The operation of the present invention as described above is as shown in FIG. 8 is a diagram illustrating a data packet processing in a packet forwarding method of a network component between a LAN and a WAN according to the present invention.

If the L3 forwarding table P2 is generated through the Proxy ARP 100 and the table P2 is set in the L3 switch 10, the actual data packet processing operates according to the following procedure. It may be used simply as a division of WAN interface, or may be used by extending a logical interface according to a processing method.

As shown in Fig. 8, the L3 switch 10 receives the data packet from the LAN Device Driver 11 built therein and finds the source IP address 20.20.20.20 and the destination IP address 10.10.10.10 of the CPU 20. The destination IP address finds a predefined Forwading Table (P3) using the Longest Prefix Match (LPM) method and searches for a corresponding number of addresses such as WAN IP address 10.10.10 / 24. Here, the forwading table (P3) is formed with each of the WAN IP address, a physical port facing the CPU (2), and a logical interface of the next hop.

The 10.10.10.X / 24 network discovered by the L3 switch 10 knows that all data must go out to the logical interface # 1, and the physical port output to the CPU 20 is # 0. The MAC address of the destination port of the logical interface is a masking of the L3 Forwarding Table (P2) generated in advance through the Proxy ARP (100) and the 10.10.10.X / 24 is 00: 00: F0: 01: 00: 00 Recognize that it corresponds to a MAC address. Here, when there are a plurality of final IP addresses, the MAC addresses also have a corresponding number.

Then, the L3 switch 10 transmits the data packet to the destination physical port # 0 found in the forwarding table P3 using the found MAC address 00: 00: F0: 01: 00: 00 as the final destination MAC address. When the CPU 20 receives the corresponding data and checks the first 3 bytes of the final destination MAC address, and confirms that it is its own, the CPU 20 sees the next 3 bytes again and compares it with the WAN Forwarding Table (P1) that it is losing.

If the same MAC address as the destination is registered according to the WAN Forwarding Table (P1), the data link layer 13 directly transmits the data to the WAN device driver 14 of the WAN port registered at the MAC address. Send it to layer 12 and process it in the same way as the old way. The CPU 20 sends out a data packet after performing a task for exiting from the corresponding WAN device driver 14 to the WAN # 01.

In the process of comparing with the WAN Forwarding Table (P1), the broadcast and multicast MACs are processed according to the conventional method in the 3 byte search process before the MAC address, and the lower 3 byte search method may support various methods.

The method of viewing and processing the lower 3 bytes is divided by logical interface. The logical interface may be divided into physical interfaces of the WAN as shown in FIG. 8, but may also be classified as logical interfaces in which data packets defined by Class or Flow are divided as shown in FIG. 9.

9 is a diagram illustrating a data packet processing of another embodiment in the packet forwarding method of a network component between a LAN and a WAN according to the present invention.

In other words, if the data output through the same physical interface has a different processing method, it can be processed by dividing it into a logical interface, which can be used by dividing the lower 3 bytes of the MAC address into hierarchical bits. For example, the fourth byte may be a physical interface, the fifth byte may be a QoS processing method, and the sixth byte may be a logical interface according to a final processing method.

For example, if the WAN destination IP address is 10.10.10./24, the data packet using tcp protocol is defined as flow # 1, and the data packet using udp protocol is defined as flow # 2. In this way, the segmentation is possible.

This classification process is defined by five fields called classification (hereinafter referred to as Class), that is, destination IP address, source IP address, protocol type (tcp, udp ..), destination port number, and source port number.

Therefore, the L3 switch 10 may determine the output port by dividing into packets defined as a class or a flow to provide additional functions. The class or flow can be specified by the user to compare not only the destination IP address of the incoming data packet but also many other distinguishable ones.

Similarly, the CPU 20 may determine only a WAN output port as shown in FIG. 8, but may define a WAN port + output process as shown in FIG. 9. The output process allows you to do certain tasks, such as quality of service (QoS) or tunneling, on outgoing data packets. In other words, the process of tcp among 10.10.10.xx / 24 sets the process procedure to go out to WAN # 1 while QoS is not applied, or udp in 10.10.10./24 applies the QoS to go out to WAN # 1 Process. The procedure can be set. At this time, more detailed processing is possible according to classification. For example, referring to the WAN Forwarding Table (P1) of the CPU 20 shown in FIG. 9, the WAN port to exit for Logical I / F # 01 is # 01, and the processing method is determined by the procedure of Process # 01. Therefore, it handles data packets.

If the flow # 1 defined in the L3 switch 10 is assumed to be a destination IP address (Destination Address): 10.10.10 / 24, protocol type: TCP, and destination port: 1056, the CPU Assuming Process # 01 of (20) is QoS applied-High Priority,

In L3 switch 10, Nexthop for Flow # 1 is # 01 and Physical Port is directed to # 0 (CPU), where the MAC address is 00: 00: F0: 01: 00: 00.

The CPU (20) reports that the MAC address is 00: 00: F0: 01: 00: 00, and the output WAN port is # 01, and the processing method recognizes that process # 01 is processed in the corresponding s / w, and the corresponding s / w Processes process # 01 (high priority marking) and transmits to WAN port # 01. Here, the processing method according to the process # can be arbitrarily defined by the user in the CPU 20 and may be various methods.

On the other hand, it is more effective to define important data packets such as voice and video because there may be a delay in searching time in LAN Device Driver 11 when classifying too many classes. This can also be used with the data filter function of the switch.

In addition, since LPM only occurs in the L3 switch 10, a search based on numerous IP addresses does not occur for data packets of LAN-> WAN in the CPU. In the case of WAN-> LAN, the LPM search occurs on the L3 switch if it knows that it is a data packet going to the LAN. However, in a typical WAN switch router, there is not much data exchange between WANs, so that excessive CPU load is hardly generated.

As described above, the present invention improves the performance of the system by reducing the data processing burden of the CPU by fast forwarding the data when the packet data is transmitted between the LAN and the WAN, and thus applies a low performance CPU. It is apparent to those skilled in the art that various modifications and variations are possible within the scope of the technical idea, which perform almost the same functions as a high-performance CPU, and such variations and modifications belong to the appended claims.

The present invention can increase the IP transmission speed while guaranteeing the quality of service (QoS) of data as well as basic IP forwarding between LAN-WAN, and the main CPU overload in the equipment is rather reduced to reduce CPU Other functions can be activated during idle time, which is relatively cost effective.

Claims (14)

In a network component connected to a local area network (LAN), a wide area network (WAN), and an address resolution server, Receiving a MAC (Media Access Control) address for each destination IP address from the address determination server, generating an L3 forwarding table, assigning an MAC address to an IP packet received from a LAN with reference to the L3 forwarding table, and transmitting it to the CPU L3 switch module; And a CPU generating a WAN forwarding table including MAC addresses for each WAN port and transmitting IP packets received from the L3 switch module to the corresponding WAN ports by referring to the WAN forwarding table. The method of claim 1; The L3 forwarding table further comprises a logical interface field. The method of claim 1; The WAN Forwarding Table further comprises a logical interface field. The method of claim 1; Wherein said address resolution server is an Address Resolution Protocol (ARP) server or a Reverse Address Resolution Protocol (RARP). The method of claim 1; The network component is a switch router. The method of claim 1; The CPU has a table for finding a WAN device driver corresponding to the MAC address, and the table may add at least one item for processing a specific service of QoS or tunneling before a data packet is transmitted to the device driver. Characterized in that the network component. The method of claim 1; The L3 forwarding table may add items grouped by destination IP address, source IP address, protocol type, destination port number, and source port number. In the packet forwarding method of a network component connected to a local area network (LAN), a wide area network (WAN), and an address determination server, Receiving a media access control (MAC) address for each destination IP address from the address determination server, generating an L3 forwarding table, and designating and transmitting a MAC address to an IP packet received from a LAN with reference to the L3 forwarding table; And generating a WAN forwarding table including MAC addresses for each WAN port, and transmitting the transmitted IP packet to a corresponding WAN port by referring to the WAN forwarding table. The method of claim 8; The L3 forwarding table further comprises a logical interface field. The method of claim 8; The WAN Forwarding Table further comprises a logical interface field. The method of claim 8; The address resolution server packet forwarding method of the network component, characterized in that the address resolution protocol (ARP) server or Reverse Address Resolution Protocol (RARP). The method of claim 8; And said network component is a switch router. The method of claim 8; The L3 forwarding table may add items grouped by a destination IP address, a source IP address, a protocol type, a destination port number, and a source port number. The method of claim 8; The CPU has a table for finding a WAN device driver corresponding to the MAC address, and the table may add at least one item for processing a specific service of QoS or tunneling before a data packet is transmitted to the device driver. Packet forwarding method of a network component, characterized in that.

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