KR20070082790A - Apparatus and method for in ethernet system - Google Patents

Abstract

A duplicated switch apparatus in an ethernet-based system and a method thereof are provided to implement switch duplication more efficiently and obtain an effect of load balancing by connecting two L3 switches to two routers, classifying the switches into an active state and a standby state for management, and maintaining both of them in an active state for switching. A duplicated switch apparatus in an ethernet-based system, which is linked with an external network through the first router and the second router, comprises a subscriber board(101), the first switch(110), and the second switch(120). The subscriber board is connected with a subscriber. The first switch interworks with the first router and the subscriber board in an active state. The second switch is linked with the second router in an active state and the subscriber board in a standby state. The first and second switches have the same IP address for the subscriber board and different IP addresses for the first and second routers.

Description

Switch redundancy device in Ethernet-based system and its method {Apparatus and Method for In Ethernet System}

Figure 1a, 1b, 1c, 1d is a view showing the redundancy of the L2 / L3 switch in a typical xDSL / VoIP system.

Figure 2 is a view showing the L2 / L3 switch redundancy structure of the subscriber receiving apparatus according to the present invention.

3 is a diagram illustrating an operation flow of an active / active state L2 / L3 switch of a subscriber receiving device according to the present invention;

4 is a diagram illustrating an operation flow of an active / standby state L2 / L3 switch of a subscriber receiving device according to the present invention;

* Description of the symbols for the main parts of the drawings *

10: xDSL / VoIP Communication System

11: Active Switch 12: Standby Switch

20, 21, 22: Optical Coupler 30: Router

100: subscriber accommodation device 110: active / active switch

120: Active / Standby Switch 101: Subscriber Board

310, 320: Router

The present invention relates to a switch duplication apparatus and method thereof in an Ethernet based system.

In communication systems such as Ethernet-based chassis-like xDSL or VoIP, traffic from Ethernet / IP-based subscriber boards is centralized and connected to the network. The centralized traffic is handled by the L2 / L3 switch board. Here, the L2 switch reads the packet's destination MAC address with the MAC address table and forwards it to the corresponding port. The L3 switch is a switch that functions up to the network layer. The L3 switch looks at the destination's IP address according to the route stored in the routing table, not the MAC address table, and forwards the packet to the optimal route.

When L2 / L3 switch board is redundant in Ethernet-based xDSL / VoIP communication system, it is common to use the optical splitter for connection with the upper network or to disconnect the link with the standby board. In addition, there is a case that only one board is operated and operated in consideration of dual screen of link without applying board duplication.

1A, 1B, 1C, and 1D show a redundant state of an L2 / L3 switch in a general xDSL / VoIP system.

FIG. 1A illustrates a structure in which each switch and an optical splitter are connected by one link in a redundant structure of the L2 / L3 switches 11 and 12 included in the xDSL / VoIP communication system 10.

In the case of FIG. 1B, not only the L2 / L3 switch but also the optical splitter has a redundant configuration. In this case, each switch board is connected to each optical splitter.

1A and 1B are cases where a switch board is duplexed and connected by using an optical splitter. In this case, problems such as complicated management and additional system shapes are caused by using a separate optical splitter for redundancy. . Also, since the optical splitter only supports the optical type Ethernet interface, the optical splitter cannot be used when the RJ45 type Ethernet interface is used.

FIG. 1C illustrates a case in which only the L2 / L3 switch is redundantly configured without using an optical splitter. In the case of FIG. 1C, since only the switches 11 and 12 are connected without duplication, the RJ45 interface may be used, but the link between the standby board 12 and the router is not operated and the Ethernet of the router is not operated. Cause waste of ports.

FIG. 1D shows a state in which only a link between a switch and a router is duplicated without using an optical splitter and without a redundant L2 / L3 switch. That is, since the redundancy structure does not consider the duplication of the switch, there is a disadvantage that the processing is not possible when the switch board is failed.

As discussed, there are several methods for redundancy between existing xDSL / VoIP communication systems and routers, but each method has a problem of using an optical splitter, resource equipment due to switch board redundancy, and no solution in case of board failure. It can be seen that there is a problem.

In order to solve the above problems, in the Ethernet-based chassis type xDSL / VoIP communication system, the L3 switch board redundancy processing is not used, and the redundancy processing is possible for not only the optical interface but also the RJ45 interface. An object of the present invention is to provide an apparatus and method for connecting to two routers to perform a process and load distribution for link failure.

Switch duplication apparatus of the Ethernet-based system according to an aspect of the present invention for achieving the above object, the subscriber board connected to the subscriber; A first switch cooperating with the first router in an active state and cooperating with the subscriber board in an active state; And a second switch cooperating with the second router in an active state and cooperating with the subscriber board in a standby state.

The switch is characterized in that the L3 switch.

The first switch and the second switch are set to have the same IP address for the subscriber board and have separate IP addresses for the first router and the second router.

The first switch sets a link connected with the first router and a link connected with the second switch as a default gateway.

The first switch receives a link failure signal between the second switch and the second router from the second switch, and blocks routing to the second switch.

When the first switch receives a recovery signal of a link failure between the second switch and the second router from the second switch, the routing priority to the second switch is restored.

Meanwhile, the second switch sets a link connected to the second router and a link connected to the first switch as a default gateway.

The first switch transmits a switching signal to the second switch when a failure occurs in both the link between the first switch and the first router and the link between the first switch and the second switch.

The second switch receiving the transfer signal changes the link with the subscriber board to an active state and performs packet processing flowing from the subscriber board.

According to another aspect of the present invention, there is provided a method of switching redundancy of an Ethernet-based system, the method comprising: interworking a first switch with an active state of the first router, and interworking with the first switch and the subscriber board; Interlocking a second switch with the second router in an active state, and interlocking the second switch with the subscriber board in a standby state; And transmitting the switching signal to the second switch when both the link between the first switch and the first router and the link between the first switch and the second switch have failed. .

In the switch redundancy method of the Ethernet-based system, if the first switch receives a link failure signal between the second switch and the second router from the second switch, blocking the routing to the second switch; It includes more.

In the switch redundancy method of the Ethernet-based system, when the first switch receives a recovery signal of a link failure between the second switch and the second router from the second switch, routing priority to the second switch is determined. The method may further include restoring.

The second switch receiving the transfer signal from the first switch further includes changing a link with the subscriber board to an active state and performing packet processing flowing from the subscriber board.

Hereinafter, a preferred embodiment according to the present invention will be described in detail with reference to the drawings.

Figure 2 is a view showing the L2 / L3 switch redundancy structure of the subscriber receiving apparatus according to the present invention.

The subscriber accommodating device 100 according to the present invention includes two switches 110 and 120 and a subscriber board 101 for redundancy processing. The subscriber accommodating device 100 is a device that supports xDSL, VoIP service, and the like. Examples of the xDSL device may include an ADSL or VDSL device, and an example of the VoIP device may include an access gateway.

The subscriber receiving apparatus 100 is connected to an external network through two routers 310 and 320. Router 1 310 is connected to Switch 1 110 in the subscriber receiving device, Router 2 320 is connected to Switch 2 120, and each link (Ethernet 1, Ethernet 2) is both active. to be.

Among the two switches included in the subscriber accommodating device, switch 1 110 is in an active / active state, and switch 2 120 is in an active / standby state. The first field is the state of the switch. Both switches are active. The second field represents the management status, one of the two switches is active but the other is standby. If the first field of both switches is active, that means both switches are working. In addition, the management state is defined internally between the switches for the management of link management, link priority processing, etc. connected to each subscriber.

Referring to FIG. 2, Ethernet 5, which is a connection link between the switch 2 120 and the subscriber board 101, is in a standby state, and no substantial communication is performed. That is, in the relationship with the subscriber board, only switch 1 110 plays a substantial role, and switch 1 110 and switch 2 120 viewed from the subscriber board have the same IP address. However, in the relationship between Router 1 310 and Router 2 320, each switch 110, 120 is recognized as a different switch having a separate IP address. This is because Ethernet 1, which is a link between Router 1 310 and Switch 1 110, and Ethernet 2, which is a link between Router 2 320 and Switch 2 120, are all active. In other words, both Ethernet links are active links that allow actual communication.

On the other hand, the state of Ethernet 3, which is the link between Switch 1 110 and Switch 2 120, is also active.

In summary, from the standpoint of switch 1 110, that is, the management state is active, the subscriber board is from the standpoint of switch 2 120, that is, from a switch state in which the management state is standby. Only the link with 101 is in a standby state, and all remaining links operate normally.

Switch 1 110 is configured to designate Ethernet 1 and Ethernet 3 as default gateways so that traffic is distributed and routed in two paths. Switch 2 120 is also configured to be distributed routing by designating both Ethernet 2 and Ethernet 3 as the default gateway. The packet direction on the Ethernet 3 link will depend on which of the two switches is active and standby, and in the architecture shown in FIG. 2, the packet will be directed from switch 1 110 to switch 2 120. FIG.

In addition, for communication with the subscriber board, that is, traffic on Ethernet 4 and Ethernet 5, the same IP address is assigned to the interface connected to Switch 1 (110) and Switch 2 (120), respectively. It is designated as. Although two links (Ethernet 4 and Ethernet 5) are connected, Ethernet 5 is a link connected to Switch 2 120, which is an active / standby switch. Only traffic transmission will take place.

3 shows an operational flow of an active / active state L2 / L3 switch of a subscriber receiving device according to the present invention.

In the operation flow of FIG. 3, for convenience, the active / active switch is briefly displayed as an active switch and the active / standby switch is a standby switch.

The procedure of FIG. 3 describes the operation of the position of switch 1 as shown in FIG.

When the active switch receives the Ethernet 2 link (link between the standby switch and the router) failure signal from the standby switch (Yes in S301), the routing priority is adjusted so that packets are not routed to the standby switch (S302). That is, since the link between the standby switch and the router has failed, the standby switch does not transmit the packet.

When the Ethernet 2 link recovery signal is received from the standby switch (Yes in S303), the routing priority of the standby switch is restored to be routed to the standby switch as well as the router connected to the active switch (S304).

On the other hand, if the Ethernet 2 link recovery signal is not received from the standby switch (No in S303), the Ethernet 1 link is checked for failure (S305), the Ethernet 3 link is checked for failure (S306), and Ethernet 2 If the link is normal (YES in S307), the transfer signal is transmitted to the standby switch (S308). That is, even if the active switch is normal, if the Ethernet 1 link connecting the active switch and the router and the Ethernet 3 link connecting the active switch and the standby switch fail, the path for transmitting the packet to the active switch is closed. The active switch will not work. Thus, the standby switch is to replace the role of the active switch.

The active switch which has transmitted the transfer signal to the standby switch performs a process of switching its state from the active state to the standby state (S309) and enters the standby state (S310).

4 shows an operation flow of an active / standby state L2 / L3 switch of a subscriber receiving device according to the present invention.

Similarly, in FIG. 4, the active / active switch is briefly displayed as an active switch and the active / standby switch is a standby switch.

When the standby switch fails in the Ethernet 2 link (Yes in S401), if it does not receive a switching signal from the active switch (No in S411), the standby switch reports the failure state of the Ethernet 2 link to the active switch (S412). When the failure of the Ethernet 2 link is recovered (Yes in S413), the link recovery signal of Ethernet 2 is transmitted to the active switch (S414).

On the other hand, even if the Ethernet 2 link has not failed (No at S401), if the Ethernet 3 link has failed (Yes at S402), if no transfer signal is received from the active switch (No at S406), the Ethernet 2 link is disconnected. Disconnect (S407). In the standby switch, if there is a link failure in Ethernet 3, which is a link to the active router, there is no packet to be transmitted to Ethernet 2 because there is no incoming packet.

If the Ethernet 3 link does not fail (No in S402) and the Ethernet 2 link is in a disconnected state (Yes in S403), link restoration for Ethernet 2 is performed (S404). If the link restoration of the Ethernet 2 is not successful (No in S405), the failure state of the Ethernet 2 link is reported to the active switch (S412). If the link restoration of Ethernet 2 succeeds (Yes in S405), when a transfer signal is received from the active switch (Yes in S408), the switchover is performed from the standby state to the active state (S409), and the system enters the active state. (S410). At this time, when the existing standby switch becomes an active switch, the state of Ethernet link 5 between the switch and the subscriber board is also changed to active.

The present invention provides a more efficient switch redundancy by connecting two L3 switches with two routers, maintaining a redundant state for management as active or standby, and maintaining a switching role in both active states. The effect of load balancing can also be expected.

Claims (17)

In the switch redundancy device of an Ethernet-based system that interworks with an external network through a first router and a second router, A subscriber board connected with the subscriber; A first switch cooperating with the first router in an active state and cooperating with the subscriber board in an active state; And And a second switch cooperating with the second router in an active state and cooperating with the subscriber board in a standby state. The method of claim 1, The switch is a switch redundancy device of the Ethernet-based system, characterized in that the L3 switch. The method of claim 1, The first switch and the second switch is configured to have the same IP address for the subscriber board, and to have a separate IP address for the first router and the second router. Switch redundancy device. The method of claim 1, The first switch, Switch redundancy apparatus of an Ethernet-based system for setting the link connected to the first router and the link connected to the second switch as a default gateway. The method of claim 4, wherein The first switch, Receiving a link failure signal between the second switch and the second router from the second switch and blocking routing to the second switch. The method of claim 5, The first switch, Receiving a recovery signal of a link failure between the second switch and the second router from the second switch and restoring a routing priority to the second switch. The method of claim 1, The second switch, And a link connected to the second router and a link connected to the first switch as a default gateway. The method of claim 1, The first switch, Switch duplication apparatus of the Ethernet-based system, characterized in that for transmitting the transfer signal to the second switch, if both the link between the first switch and the first router and the link between the first switch and the second switch has failed . The method of claim 8, The second switch receiving the transfer signal is, Switch duplication apparatus of the Ethernet-based system, characterized in that for changing the link with the subscriber board to the active state and processing the packet flows from the subscriber board. In the switch redundancy method of an Ethernet-based system interworking with an external network through a first router and a second router, Interlocking a first switch with the first router in an active state, and interlocking the first switch with the subscriber board in an active state; Interlocking a second switch with the second router in an active state, and interlocking the second switch with the subscriber board in a standby state; And The first switch may include transmitting a switching signal to the second switch when both a link between the first switch and the first router and a link between the first switch and the second switch have failed. How to switch redundancy on base systems. The method of claim 10, The switch is a switch redundancy method of the Ethernet-based system, characterized in that the L3 switch. The method of claim 10, Wherein the first switch and the second switch have the same IP address for the subscriber board and have separate IP addresses for the first router and the second router. Switch redundancy method. The method of claim 10, The first switch, And a link connected to the first router and a link connected to the second switch as a default gateway. The method of claim 10, Blocking the routing to the second switch when the first switch receives a link failure signal between the second switch and the second router from the second switch. . The method of claim 14, Restoring routing priority to the second switch when the first switch receives a recovery signal of a link failure between the second switch and the second router from the second switch. Switch redundancy method. The method of claim 10, The second switch, And a link connected to the second router and a link connected to the first switch as a default gateway. The method of claim 10, The second switch receiving the transfer signal from the first switch, Changing the link with the subscriber board to an active state and performing packet processing coming from the subscriber board.

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