KR100748694B1 - Network link duplexing system in real-time transport protocol network system and control method thereof - Google Patents

Abstract

A network link duplexing system in an RTP(Real-time Transport Protocol) network system and a control method thereof are provided to improve the performance of a router and to reduce the loss of resources without using a VRRP(Virtual Router Redundancy Protocol). A network link duplexing system in an RTP network system includes a link control unit(100), a first router(210), and a second router(220). The first and the second routers(210,220) are linked in duplex configuration to be connected to the link control unit(100). The link control unit(100) sets the first router(210) as a master and the second router(220) as a slave. When trouble occurs at the first router(210), the link control unit(100) changes settings of routers(210,220) and replaces the MAC information of the first router(210) which is registered at the RTP session Hash table with the MAC information of the second router(220).

Description

Network link duplexing system in real-time transport protocol network system and control method

1 is a functional block diagram showing the configuration of a network link redundancy system in a network system supporting RTP according to the present invention.

2 is a flowchart illustrating a method for controlling network link redundancy in a network system supporting RTP according to the present invention.

FIG. 3 is a flowchart illustrating the detailed steps of the third step S3 in the method for controlling network link redundancy in the network system supporting RTP according to FIG. 2.

<Explanation of symbols for main parts of the drawings>

100: link control unit 110: interface router table

120: monitoring task 130: arp table

140: Packet Control Management Task 150: RTP Session Hash Table

160: call processing management task 210: the first router

220: second router

The present invention is implemented in an AGW (Access Gate Way) system, the instant link when the primary link down occurs, which may occur during the redundant operation between the external network interface of the AGW system and the router on the network. The present invention relates to a network link redundancy system and a control method thereof in a network system supporting RTP for the purpose of improving VoIP quality and stabilizing services by minimizing loss of VoIP traffic by performing redundancy.

The redundancy system of the network is based on the precondition that two routers are operated in a redundant form and operated as two links (primary and secondary) directly connected between the AGW system and the router. In most cases, redundancy with the router is implemented using the Virtual Router Redundancy Protocol (VRRP), but the limitation is that it takes at least 3 seconds to transfer due to link failure.

This is a problem that can significantly reduce the quality of VoIP traffic having a real-time characteristics.

Among network operators, if the system stability is the first priority, there may be a case in which a network is configured in a duplex form in which two routers are directly connected to each other without using a switch between AGW system routers in the same country.

In the case of configuring a network in a redundant form directly connected to each other without using a switch between the AGW system and two routers in the same country, it is possible to implement router redundancy using the Virtual Router Redundancy Protocol (VRRP). Link redundancy was implemented.

Here, the VRRP is an internet protocol that provides a method for having one or more backup routers when using a statically configured default router on a local area network. Although there are other alternatives, the most common arrangement is to configure one router to serve packets from a group of hosts on the local area network.

However, if the router fails, there is no way to use another router as a backup. Therefore, one virtual IP address is set by default using VRRP. And, the virtual IP address is shared between routers, one designated as the master router and the other designated as backups.

If a problem occurs in the master, the virtual IP address is mapped to the IP address of the backup router (this backup router becomes the master router).

However, router redundancy using the Virtual Router Redundancy Protocol (VRRP) has the limitation that the transfer time to the backup router takes at least 3 seconds when the router or link is down, resulting in massive loss of RTP data. There was a problem that can significantly reduce the VoIP voice quality due to the occurrence.

Accordingly, an object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a network link redundancy system and a network link redundancy system in which a network link capable of effective redundancy of a network link in a network system having real-time characteristics is provided. To provide a control method.

According to an aspect of a network link redundancy system in a network system supporting RTP according to the present invention for achieving the above object, a first router and a second router configured with redundancy; And setting the redundant first router as the master and the second router as the slave, respectively, and changing the settings of the first router set as the master and the second router set as the slave when a failure occurs in the first router set as the master. And a link control unit for replacing MAC information of the first router registered in the RTP session hash table with MAC information of the second router.

The link control unit may further include: a monitoring task configured to monitor whether or not a failure of the first router configured as the master occurs, and to change settings of the first router and the second router when a failure occurs in the first router; If it is confirmed that a failure occurs in the first router configured as a master through the monitoring task, a request for an address resolution protocol (arp) request is made to the second router configured as a slave, and when an "arp reply" is received from the second router, 2 A packet control management task that registers the router as a master in the arp table, while invoking "rtp Session Update Trigger Ev Callback"; And "rtp Session Update Trigger Ev Callback" is input from the packet control management task, and replaces the MAC processing information of the first router registered in the RTP session hash table with the MAC information of the second router set as the master. Include.

In this case, the monitoring task periodically monitors the states of the first router set as the master and the second router set as the slave, and when there is a change in the state of the first router set as the master, the monitoring task includes: Update and monitor the router configured with redundancy in units of 50ms.

The "rtp Session Update Trigger Ev Callback" includes MAC information of a second router whose configuration is changed from slave to master.

According to an aspect of a method for controlling network link redundancy in a network system supporting RTP according to the present invention, the method may further include: setting a master and a slave of a redundantly connected router; Periodically monitoring, by the link control unit, a state of a first router configured as a master to determine whether a failure occurs in the first router; Converting, by the link control unit, a first router set as a master to a slave and a second router set as a slave to a master when a failure occurs in the first router set as a master in the determining step; The link control unit calls "rtp Session Update Trigger Ev Callback" to replace all MAC information of the first router registered in the RTP session hash table with MAC information of the second router whose configuration is changed to the master.

Here, the step of setting the link control unit as a master and a slave of the redundantly connected router may include MAC information of the first router and the second router configured as the slave and the link control unit as the master, Stores state information in the interface router table.

The converting of the first router set as the master to the slave and the converting of the second router set as the slave to the master may include: "arp to a second router for converting the setting to the master. sending request "; And after the link control unit receives the "arp reply" from the second router for changing the setting to the master, updating the second router to the master in the arp table.

Meanwhile, in the step of determining whether a failure occurs in the first router by periodically monitoring the state of the first router set as the master, the monitoring period is monitored in units of 50 ms.

Hereinafter, a preferred embodiment of a network link duplication system and a control method thereof in a network system supporting RTP according to the present invention will be described in detail with reference to the accompanying drawings. At this time, it will be understood by those of ordinary skill in the art that the system configuration described below is a system cited for the purpose of the present invention and does not limit the present invention to the following system.

1 is a diagram showing the configuration of a network link redundancy system in a network system supporting RTP according to the present invention. The network link redundancy system in a network system supporting RTP according to the present invention includes a link control unit 100; The first router 210 and the second router 220 configured as redundancy are included.

The first router 210 and the second router 220 are redundantly connected to the link control unit 100.

The link control unit 100 sets the redundant first router 210 as the master and sets the second router 220 as the slave, respectively, while a failure occurs in the first router 210 set as the master. When the second router 220 changes the settings of the first router 210 set as the master and the second router 220 set as the slave, the MAC information of the first router 210 registered in the RTP session hash table is displayed. And replaces the interface router table 110, the monitoring task 120, the arp table 130, the packet control management task 140, the RTP session hash table 150, and the call processing management task 160. Include.

The monitoring task 120 of the link control unit 100 monitors whether a failure of the first router 210 set as the master occurs, and when a failure occurs in the first router 210, the first router 210 and the first router 210. 2 Change the settings of the router 220. At this time, the monitoring cycle of the monitoring task 120 is 50ms.

When the packet control management task 140 of the link control unit 100 confirms that a failure occurs in the first router 210 set as a master through the monitoring task 120, the second router 220 set as a slave. Request the "arp request" and the "arp reply" from the second router 220 registers the second router 220 as a master in the arp table 130, while the "rtp Session Update Trigger Ev Callback "Is called. At this time, the "rtp Session Update Trigger Ev Callback" called by the packet control management task 140 includes MAC information of the second router 220 whose configuration is changed from slave to master.

In addition, if the "rtp Session Update Trigger Ev Callback" is requested from the packet control management task 140, the call processing management task 160 of the link control unit 100 is registered in the RTP session hash table 150. The MAC information of the first router 210 is replaced with the MAC information of the second router 220 set as the master.

General functions and detailed operations of the above-described elements will be omitted, and the operations will be described based on operations corresponding to the present invention.

When the first router 210 and the second router 220 are configured in redundancy and connected to the link control unit 100, the link control unit 100 uses the redundant first router 210 as a master. And set the second router 220 as a slave. Here, the settings of the first router 210 and the second router 220 may be changed.

The interface router table 110 includes at least one IP information, subnet information, and state information of the connected first router 210 and the second router 220, as shown in [Table 1].

link Gateway IP subnet Router's Status Link 1 165.213.95.1 255.255.255.0 act (primary) Link 2 165.213.96.1 255.255.255.0 deact (secondary)

First, in order to set the first router 210 as a master, the IP information of the first router 210 to be set as the master by the monitoring task 120 of the link control unit 100 is set in the interface router table 110. After checking, the packet control management task 140 is informed.

Then, the packet control management task 140 checks whether the MAC information of the first router 210 exists in the arp table 130, and if not, transmits an "arp request" to the first router 210. Upon receiving the "arp reply" from the first router 210, the first router 210 is updated to the arp table 130 as a master.

Then, the call processing management task 160 stores the MAC information of the first router 210 in the RTP session hash table 150 as information for RTP session management and a connection pointer. In this case, the RTP session hash table 150 has local MAC information, router MAC information, IP, port, and the like.

Accordingly, when any packet is received from the subscriber 1, the call processing management task 160 looks up the RTP session hash table 150 and then looks up the corresponding connection pointer, that is, the first router 210 set as the master. ) To the destination.

If a failure occurs in the first router 210 while the monitoring task 120 monitors the first router 210 set as the master, the status information of the first router 210 and the second router 220 is displayed. As shown in Table 2, the interface router table 110 is changed and IP information of the second router 220 to be set as a master is transmitted to the packet control management task 140. At this time, the monitoring cycle of the monitoring task 120 is 50ms.

link Gateway IP subnet Router's Status Link 1 165.213.95.1 255.255.255.0 deact (secondary) Link 2 165.213.96.1 255.255.255.0 act (primary)

After checking the IP information of the second router 220 to be set as the master from the monitoring task 120, the packet control management task 140 requests an “arp request” from the second router 220 and the second information. When the “arp reply” is received from the router 220, the second router 220 is registered as a master in the arp table 130.

Subsequently, the packet control management task 140 calls "rtp Session Update Trigger Ev Callback". At this time, the "rtp Session Update Trigger Ev Callback" called by the packet control management task 140 includes MAC information of the second router 220 whose configuration is changed from slave to master.

Then, as the "rtp Session Update Trigger Ev Callback" is requested from the packet control management task 140, the call processing management task 160 is the MAC of the first router 210 registered in the RTP session hash table 150. The information is replaced with MAC information of the second router 220 set as the master. That is, the call processing management task 160 replaces the MAC information of the second router 220 with the RTP session management information and the connection pointer in the RTP session hash table 150. In this case, the RTP session hash table 150 has local MAC information, router MAC information, IP, port, and the like.

Therefore, when any packet is received from the subscriber 1, the call processing management task 160 looks up the RTP session hash table 150 and then the second router 220 set as a corresponding connection pointer, that is, a master. ) To the destination.

Next, a method for controlling network link redundancy in a network system supporting RTP according to the present invention having the above configuration will be described with reference to FIG. 2.

First, the link control unit 100 sets up a master and a slave of a router which is duplexed and connected (S1). At this time, the link control unit 100 stores the MAC information of the first router 210 set as the master and the second router 220 set as the slave and the state information of each router in the interface router table 110. .

Subsequently, the link control unit 100 periodically monitors the state of the first router 210 set as the master to determine whether a failure occurs in the first router 210 (S2). In the step of determining whether a failure occurs in the first router 210 by periodically monitoring the state of the first router 210 set as the master, the monitoring period is 50 ms.

At this time, if a failure occurs in the first router 210 set as the master in the determination step (S2) (YES), the link control unit 100 converts the first router 210 set as the master into a slave and the slave. The second router 220 is set to convert to the master (S3).

Hereinafter, the detailed steps of the step (S3) of the link control unit 100 converts the first router 210 set as the master to the slave and the second router 220 set as the slave to the master. This will be described with reference to 3.

First, the link control unit 100 transmits an "arp request" to the second router 220 for converting the setting to the master (S31).

Subsequently, the link control unit 100 receives the "arp reply" from the second router 220 for changing the setting to the master, and then updates the second router 220 to the master in the arp table 130. (S32).

Subsequently, the link control unit 100 calls the " rtp Session Update Trigger Ev Callback " to change the MAC information of the first router 210 registered in the RTP session hash table 150 to the master. All of the MAC information of 220 is substituted (S4).

Although the present invention has been described in detail only with respect to the specific embodiments described, it will be apparent to those skilled in the art that various changes and modifications can be made within the spirit of the present invention, and such modifications and modifications belong to the appended claims. .

As described above, according to the network link redundancy system and control method thereof in a network system supporting RTP according to the present invention, a router can be used without the use of VRRP in the router for link redundancy of the network system for VoIP communication having real-time characteristics. It has an excellent effect of improving performance and reducing waste of resources.

In addition, since there is no need to additionally receive a backup router for redundancy of the network link, there is another outstanding effect of maximizing the utilization of the router.

Claims (9)

In a network link redundancy system in a network system supporting RTP, A first router and a second router configured with redundancy; And Setting the redundant first router as the master and the second router as the slave, and if the first router configured as the master fails, changing the settings of the first router set as the master and the second router set as the slave; A network link redundancy system in a network system supporting RTP including a link control unit which simultaneously replaces MAC information of the first router registered in the RTP session hash table with MAC information of the second router. The method of claim 1, The link control unit, A monitoring task for monitoring whether a failure of the first router configured as the master and changing a configuration of the first router and the second router occurs when a failure occurs in the first router; If it is confirmed that a failure occurs in the first router set as the master through the monitoring task, a request for an "arp request" is made to the second router set as the slave, and when the "arp reply" is received from the second router, the second router is set in the arp table. A packet control management task that registers as a master and calls "rtp Session Update Trigger Ev Callback"; And When the "rtp Session Update Trigger Ev Callback" is input from the packet control management task, a call processing management task of replacing the MAC information of the first router registered in the RTP session hash table with the MAC information of the second router set as the master. Network link redundancy system in a network system that supports RTP. The method of claim 2, The monitoring task, Periodically monitors the status of the first router set as the master and the second router set as the slave, and when there is a change in the status of the first router set as the master, the RTP updating the interface router table storing the MAC information of each router Network link redundancy system in a network system that supports the. The method of claim 3, wherein The monitoring task, Network link redundancy system in a network system supporting RTP, characterized in that for monitoring the redundant router configured in units of 50ms. The method of claim 2, The "rtp Session Update Trigger Ev Callback", A network link redundancy system in a network system supporting RTP, characterized in that it includes MAC information of a second router whose configuration is changed from slave to master. In the network link redundancy control method in a network system supporting RTP, Setting a master and a slave of a redundantly connected router; Periodically monitoring, by the link control unit, a state of a first router configured as a master to determine whether a failure occurs in the first router; Converting, by the link control unit, a first router set as a master to a slave and a second router set as a slave to a master when a failure occurs in the first router set as a master in the determining step; The link control unit calling “rtp Session Update Trigger Ev Callback” to replace all MAC information of the first router registered in the RTP session hash table with MAC information of the second router whose configuration is changed to the master; Network link redundancy control method in a network system supporting RTP. The method of claim 6, The step of setting the link control unit to the master and slave of the redundantly connected router, respectively, Network link redundancy in a network system supporting RTP, wherein the link control unit stores MAC information of the first router set as the master and the second router set as the slave and the state information of each router in an interface router table. Control method. The method of claim 6, The link control unit converts the first router set as the master to the slave and the second router set as the slave to the master, Sending, by the link control unit, an "arp request" to a second router for converting a setting to a master; And Updating the second router to the master in the arp table after receiving the "arp reply" from the second router for changing the setting to the master by the link control unit. Redundancy Control Method. The method of claim 6, The monitoring period in the step of determining whether a failure occurs in the first router by periodically monitoring the state of the first router set as the master, the link control unit, Network link redundancy control method in a network system supporting RTP, characterized in that the monitoring in 50ms units.

Images