KR100406570B1 - Routing apparatus using internet traffic flow characteristics and the method thereof - Google Patents

Abstract

The present invention relates to an apparatus and method for determining a long-lasting flow by using a flow characteristic of the Internet traffic, and searching the routing table stored in the cache, which is a high-speed memory, to allow high-speed routing. This speeds up the routing path at the router and increases the packet forwarding speed at the router.

Description

Routing apparatus using internet traffic flow characteristics and the method

The present invention relates to a routing path establishment apparatus and method using the Internet traffic flow characteristics, and more particularly to the routing to obtain the information of the neighbor node required to deliver the input packet to the destination in the function of a router for transmitting packets of the Internet. A route setting device and method.

Conventional Internet routing table retrieval method is to analyze the header of the input packet to separate the network portion of the destination address (32 bits in IPv4) and then select the matching in the routing table.

The rapid spread of the Internet has led to an increase in the number of hosts on the Internet and an increase in the number of Internet networks, leading to an ever-increasing number of routing tables maintained by routers. In particular, in the Internet backbone network, when the conventional Internet routing table search method is used to obtain routing information of an input packet, it takes a long time to search the routing table.

Supporting Classless Inter-Domain Routing (CIDR) Internet addresses to accommodate the rapidly growing Internet host makes it more difficult to quickly search fields of varying lengths in the routing table. In addition, as the speed of internet transmission increases rapidly, a giga router technology is required to satisfy a routing speed comparable to that of a link.

In order to implement such a fast router, the data structure of the routing table needs to be easily searched.

However, the method of effectively creating a data structure for quickly retrieving the routing table has a disadvantage in that the dynamic structure of the data structure is difficult, and the overhead of the router increases to maintain the complex data structure.

Accordingly, the present invention has been made to solve the above-mentioned conventional problems, by using a flow characteristic of the Internet traffic to determine a long-lasting flow to search the routing table stored in the cache, which is a high speed memory to route at high speed The purpose is to provide an apparatus and method.

1 is a configuration diagram of a routing path setting device according to an embodiment of the present invention;

2 is a flowchart illustrating an internet packet processing employed in the routing path setting method of the present invention;

3 is a flow state management flowchart employed in the routing path setting method of the present invention.

<Description of Symbols for Major Parts of Drawings>

101: flow classification unit

102: flow state management unit

103: routing reference

104: routing table management unit

105: packet forwarding unit

106: cache routing table management unit

The routing path setting apparatus using the Internet traffic flow characteristic according to the preferred embodiment of the present invention uses the traffic characteristics of the Internet to classify the input IP packets according to the flow conditions and state information of the packet transmission rate, bit rate, and duration of each flow. Flow state management means for storing the classified input IP packets and flow state management means for determining the long-term flow based on the state information of the packet transmission rate, bit rate, duration of each of the calculated flow; Routing reference means for finding information of a neighbor node in a routing table to deliver each input IP packet; routing table management means for independently managing routing table entities for the long flow and routing table entities for a general flow; And a packet forwarding means for forwarding a packet to a neighbor node as a destination address by using the routing information. A routing path setting method using an Internet traffic flow characteristic according to an embodiment of the present invention may include: In the method for setting the routing path to the destination address using the routing information stored in the routing table if the input, The status of the flow periodically by using a flow status table that stores the status information of the flow for the IP packet A first step of receiving routing information about the long-term flow from the routing table and storing the long-term flow in the cache routing table; when the IP packet is input, inspecting the flow state of the IP packet to flow the IP packet; Is determined to be a long flow, the cache routing table A second step of setting a routing path to a destination address using stored routing information, and setting a routing path to a destination address using routing information stored in the routing table when the flow of the IP packet is determined to be a general flow; The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention adds a long-lasting flow discrimination function, which is one of the important features of Internet traffic, to the routing table lookup of the router to improve the lookup speed of the routing table. Packet streams input to the router have the same sender address and destination address, and are found to be "flow" and stored in the flow state table when packets using the same application service are transmitted and observed within a certain time (T) time. Flows with short duration take up a lot of flows, but are relatively low compared to flows with long packet occupancy and bit occupancy. The present invention utilizes such a feature to determine a long duration flow of packets input to the router by using a flow classifier, using a routing table stored in a fast caching memory, and a packet belonging to a short flow uses a general routing table retrieval method. It was used.

1 is a block diagram of a routing path setting device according to an embodiment of the present invention.

Reference numeral 101 is a flow classification unit for classifying input IP packets by flow status using "flow" which is a traffic characteristic of the Internet. Reference numeral 102 is a flow state management unit for storing the input IP packets classified by the flow state in the flow state table to record the activity of the flow, the packet rate, bit rate, duration of each flow. The flow state management unit 102 selects a flow that lasts for a long time among these flows by a determination method of the upper X% having a high packet transmission rate. The packet transmission rate (pps (t)) at time t is defined as in Equation 1 below.

<Equation 1>

pps (t) = w * pps (t-1) + sample_pps (0 <w <1)

Here, sample_pps is a packet transmission rate of each flow measured between a time t-1 and a time t, and w is a weight for a moving average.

Reference numeral 103 is a routing reference that finds information of a neighbor node in a routing table for delivering a packet to a destination address by referring to a header of an input IP packet. An entry in the routing table corresponding to the network portion of the destination address is retrieved by the longest prefix matching at the routing reference in the routing reference unit 103.

Reference numeral 104 is a routing table manager that informs the cache routing table manager 106 of routing table entities corresponding to the long time flow selected by the flow state manager 102.

Reference numeral 106 is a cache routing table manager that stores new routing table entities in cache memory. Routing table entities that do not correspond to the long-term flow are obtained by the routing table management unit 104 to obtain routing information about the packet.

Reference numeral 105 is a packet transfer unit that delivers a packet to a neighboring node that can deliver to the destination using the routing information.

2 is a flowchart illustrating an internet packet processing employed in the routing path setting method of the present invention.

When a packet is input to the router, the flow classification unit 101 performs a flow state table check (step 201) to determine whether the packet belongs to a conventional general flow or a new flow.

If the flow for the packet is not stored in the flow state table according to the determination result, a new flow is generated (step 202). If the flow for the packet is stored in the flow state table, a conventional general flow state is generated. In the held state (step 203), it is checked whether the flows belong to the long time flow (step 204).

Packets belonging to the long time flow acquire routing information from the cache routing table manager 106 (step 205), and packets not otherwise obtained routing information in memory by the routing table manager 104 (step 206). .

Thereafter, the packet forwarding unit 105 forwards the input packet to the next node using the obtained routing information (step 207).

3 is a flow state management flowchart employed in the routing path setting method of the present invention.

The flow state management unit 102 periodically checks the state of the flow. First, the end of the flow is checked (step 301), and the finished flow is removed from the flow state table (step 302).

Next, the flow is checked for a long time in the flow state table (step 303). The inspection method determines the percentage of flow given by the administrator in order of the latest packet rate.

When newly added to the flow for a long time, the flow state manager 102 controls the routing table manager 104 and the cache routing table manager 106 to store routing information of the flow stored in the routing table in the cache routing table, and to remove the flow table. The routing information for the completed flow is deleted to update the cache routing table (step 304).

According to the present invention as described above, by utilizing the flow characteristics of the Internet traffic, the routing path setting speed in the router is increased, and the packet forwarding speed in the router is increased.

The present invention can not only improve the existing router packet transmission speed, but also satisfy the packet transmission speed of the next-generation Internet high speed router.

In addition, preferred embodiments of the present invention are disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (10)

Flow classification means for classifying input IP packets by flow status using the traffic characteristics of the Internet and calculating status information of packet transmission rate, bit rate, and duration of each flow; Flow state management means for storing the classified input IP packets and determining a long time flow based on state information of packet rate, bit rate, and duration of each flow; Routing reference means for looking up information of a neighbor node in a routing table to deliver the respective input IP packet to a destination address; Routing table management means for independently managing the routing table entities for the long flow and the routing table entities for the general flow; And And a packet forwarding means for forwarding a packet to a neighboring node which is a destination address using the routing information. The method of claim 1, Routing table entities for the long flow flow is stored in the cache memory routing path setting apparatus using the Internet traffic flow characteristics. The method of claim 1, The routing table entities for the general flow are stored in general memory. The method of claim 1, And the flow state management means determines whether or not to flow for a long time by a determination method of the upper X% having a high packet transmission rate. The method of claim 4, wherein The packet transmission rate (pps (t)) is represented by the following equations, the routing path setting apparatus using the Internet traffic flow characteristics. pps (t) = w * pps (t-1) + sample_pps (0 <w <1) (Where sample_pps is the packet rate of each flow measured between the previous times t-1 and ttime, and w is a weight for the moving average.) In the method for setting the routing path to the destination address using the routing information stored in the routing table when the IP packet is input, The flow status table periodically stores the status of the flow for the IP packet. When the flow is detected for a long time, the routing information of the flow is received from the routing table and stored in the cache routing table. A first step of doing; When the IP packet is input, the flow state of the IP packet is inspected. When the flow of the IP packet is determined to be a long flow, a routing path to a destination address is set using routing information stored in the cache routing table. And a second step of setting a routing path to a destination address using the routing information stored in the routing table when the flow of the flow is determined to be a general flow. The method of claim 6, A routing path setting method using an Internet traffic flow characteristic, characterized in that the flow selected by the determination method of the upper X% having a high packet transmission rate is determined as a long flow. The method of claim 7, wherein The packet transmission rate (pps (t)) is expressed by the following equation. pps (t) = w * pps (t-1) + sample_pps (0 <w <1) (Where sample_pps is the packet rate of each flow measured between the previous times t-1 and ttime, and w is a weight for the moving average.) The method of claim 6, The first step is to delete the state information on the flow in the flow state table when the flow is terminated as a result of the inspection of the flow state, and the state information on the flow in the table on the flow state when a new flow is detected. Routing path setting method using the Internet traffic flow characteristics, characterized in that for storing. The method of claim 6, The status information of the flow is a routing path setting method using the Internet traffic flow characteristics, characterized in that the status information of the packet transmission rate, bit rate, duration of each flow.