KR101064283B1 - Method and system for linear protecting of eos(ethernet over sdh/sonet) line and router using mspp(multi-service provisioning platform) - Google Patents

Abstract

The present invention relates to a method and system for duplexing Ethernet over SDH / SONET (EoS) circuits and routers using a Multi-Service Provisioning Platform (MSPP). The method for duplexing EoS circuits and routers of the present invention includes a plurality of routers and hosts. Determining whether a main line of an EoS (Ethernet Over SDH / SONET) line card having a main line and an auxiliary line which is provided in the MSPP and has a switchable main line and an auxiliary line is provided in the MSPP; If it is determined that a failure occurs in the main line, determining whether the auxiliary line of the EoS line card is in a state where line switching is possible; If it is determined that the auxiliary line is capable of circuit switching, switching the line to the auxiliary line; And resetting a port of the auxiliary line so that a router connected to the auxiliary line recognizes a change in state due to a circuit changeover, whereby a service can be provided without a separate bandwidth loss. It is possible to reduce the transfer time than the STP / RSTP / MSTP technology used, and it is possible to maximize the router performance by enabling the router's redundancy without a separate routing technology.

Description

Method and System Redundancy Method and System of EPS Line and Router Using MPS 『Ethernet Over SDH / SONET (Line Over Router / EOS) Line and Router using Multi-Service Provisioning Platform (MSPP)}

The present invention relates to a duplexing method of an EoS (Ethernet Over SDH / SONET) circuit and a router (Router). The present invention relates to a duplexing method of an EoS circuit and a router.

Multi-Service Provisioning Platform (MSPP) is not a single technology that integrates all services in a communication network, but a method of integrating and implementing multiple technologies or layers in a single device. This MSPP technology can provide various services while using existing Synchronous Digital Hierarchy (SDH) network and infrastructure as it is, and can segment bandwidth as much as user wants and provide high speed, and provide subscribers the speed and service quickly without interruption. Not only can be configured and provided, there is an advantage that can automatically configure the virtual network and various forms of network configuration.

Ethernet Over SDH / SONET (EoS) refers to a technology that can transmit Ethernet over SDH / SONET. This EoS technology combines the advantages of Ethernet (speed segmentation) and SDH advantages (reliability / stability, etc.), and it is possible to efficiently utilize the existing infrastructure SDH network.

In general, Ethernet over SDH (Synchronous Digital Hierachy) / SONET (Synchronous Optical NETwork) line cards in MSPP (Multi-Service Provisioning Platform) equipment operate the network using Ethernet-based technology. In this case, a technique used to eliminate line duplication or looping of a network may include Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP). I use it. Here, STP is standardized as IEEE 802.1d, RSTP is 802.1w, and MSTP is 802.1s.

These xSTP (STP, RSTP, MSTP) technologies exchange network information using Bridge Protocol Data Unit (BPDU) packets between all network bridges in order to eliminate network loops. At this time, the root bridge is selected to determine the topology of the network. The bridge having the lowest MAC address among the MAC (Medium Access Control) addresses of each bridge is selected. The root bridge sends out BPDUs every Hello Time (Default 2 seconds) to indicate that the root bridge is operating normally. If the root bridge fails to send out BPDUs because of a malfunction, the non-root bridge will reselect the root bridge and reconfigure the network topology if no BPDUs are received from the root bridge for a maximum age (Default 30 seconds). Regenerate

As described above, in order to provide a redundancy service of an EoS circuit using the same technology as that of the related art, there is a problem in that the bandwidth loss and the transfer time of the circuit are long. In addition, when the router is duplicated, it is possible to configure using the Virtual Router Redundancy Protocol (VRRP) protocol, but there is a disadvantage in that the router has a limitation in traffic usage and routing performance for protocol processing.

An object of the present invention for solving the above problems, EoS circuit can be duplicated without using the existing STP / RSTP / MSTP technology and router can be duplicated without using a separate protocol in the router and It is to provide a duplication method of a router.

Another object of the present invention is to provide a duplexing method of an EoS circuit and a router capable of improving traffic usage and routing performance for protocol processing of a router while minimizing bandwidth loss and switching time of the circuit.

In accordance with an embodiment of the present invention, a multi-service provisioning platform (MSPP) for controlling the switching of a circuit between a plurality of routers and a host is provided in the MSPP. Determining whether the main line of the EoS (Ethernet Over SDH / SONET) line card having a main line and an auxiliary line that is circuit-switched with the router is damaged; If it is determined that a failure occurs in the main line, determining whether the auxiliary line of the EoS line card is in a state where line switching is possible; Switching the circuit to the auxiliary line if it is determined that the auxiliary line is capable of circuit switching; And resetting a port of the auxiliary line so that a router connected to the auxiliary line is aware of a state change due to the circuit changeover.

Here, the port of the auxiliary line to be reset is a Link Loss Carry Forward (LLFC) port.

According to an embodiment of the present invention, a method of duplexing an EoS line and a router may include: determining whether the main line is normally returned and kept stable for a predetermined time while the line is switched to the auxiliary line and is in use; And when the circuit is determined to be stable for the set time, switching the circuit connected to the auxiliary line to the main line.

According to an exemplary embodiment of the present invention, a method of duplexing an EoS line and a router maintains a block state so that transmission / reception of the auxiliary line through a medium access control layer is blocked when the line is switched to the main line. It may further comprise a step.

In the present embodiment, the set time is a wait to restore (WTR) time.

On the other hand, the redundant system of the EoS line and router according to an embodiment of the present invention for achieving the above object, a host for receiving a service along the connected line; An MSPP2 circuit-connected with the host and having an EoS having a main line and an auxiliary line to control circuit switching of the EoS; MSPP1 having an EoS1 connectable to the main line and an EoS2 connectable to the auxiliary line; Router 1 connected to the EoS1 and Router 2 connected to the EoS2; And an upper router 3 connected to the router 1 and the router 2, wherein the MSPP2 is switched over to the EoS2 via the auxiliary line when a failure occurs in the main line connected to the EoS1.

In the present embodiment, the MSPP2 resets a port of the auxiliary line after the line is switched through the auxiliary line, so that the router 1 connected to the auxiliary line recognizes a state change according to the line switching. do.

In addition, the MSPP2, when the circuit is switched to the auxiliary line and is in use, when the main line returns to normal and remains stable for a predetermined time, the MSPP2 connects the line connected to the auxiliary line with the EoS1 through the main line. Switch line to be connected.

Meanwhile, a multi-service provisioning platform (MSPP) for redundancy of an EoS circuit and a router through switching of circuits between a plurality of routers and a host according to an embodiment of the present invention for achieving the above object is within the MSPP. A physical layer controller configured to monitor a connection port state of an EoS (Ethernet Over SDH / SONET) line card having a main line and an auxiliary line which can be switched to the router; A protection switching controller for switching a line to the auxiliary line of the EoS line card when a failure occurs in the main line according to the connection port state monitoring; And an LLCF control unit for resetting a port of the circuit switched in the auxiliary line, so that the router connected to the auxiliary line is aware of a change in state due to the circuit switching.

In the MSPP according to an embodiment of the present invention, the protection switching control unit is a circuit connected to the auxiliary line when the main line is returned to normal and maintained stable for a predetermined time while the line is switched to the auxiliary line in use. Is switched to the main line.

In addition, the MSPP according to an embodiment of the present invention, when the circuit is switched to the main line, the medium access control to maintain a block state so that transmission and reception of the auxiliary line is blocked under the control of the protection switching controller. It further comprises a layer (MAC) control.

According to the present invention, in a system constituting a communication network using MSPP equipment, it is possible to provide a service without a separate bandwidth loss when the circuit of the EoS circuit and the router are redundant, and it is switched from the technology of STP / RSTP / MSTP. Time can be reduced, and router duplication is possible without additional routing technology, which has the advantage of maximizing router performance.

1 is a diagram illustrating a configuration of a redundant system of an EoS line and a router using a multi-service provisioning platform (MSPP) according to a preferred embodiment of the present invention.
FIG. 2 is a block diagram illustrating a detailed configuration of the MSPP2 of FIG. 1 for providing a circuit redundancy service of an Ethernet over SDH / SONET (EoS) line card according to an embodiment of the present invention.
3 is a flowchart illustrating a processing procedure for the redundancy redundancy of an EoS line card line using MSPP according to a preferred embodiment of the present invention.
4 is a flowchart illustrating a processing procedure for non-recursive redundancy of an EoS line card line using MSPP according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the same elements in the figures are represented by the same numerals wherever possible. In addition, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

The present invention does not use the traditional Spanning Tree Protocol (STP) / Rapid Spanning Tree Protocol (RSTP) / Multiple Spanning Tree Protocol (MSTP) protocol and the Virtual Router Redundancy Protocol (VRRP) of a router, and EoS for linear protection switching. (Ethernet Over SDH / SONET) We propose a duplication method for circuits and routers. To this end, in the present invention, a communication system using a Multi-Service Provisioning Platform (MSPP) as a transmission network requires a duplication of an EoS line card in a MSPP and a duplication service of a router. 1 Provide a method for providing redundant services.

1 is a diagram illustrating a configuration of a redundant system of an EoS line and a router using a multi-service provisioning platform (MSPP) according to a preferred embodiment of the present invention.

As shown, the redundant system 100 of the EoS line and the router, the router (R1, R2, R3)) (110, 112, 120), MS-PP (Multi-Service Provisioning Platform) (200, 300), EoS (Ethernet Over SDH / SONET) Line cards 130, 132, 140, and 142, and the host (150, 152).

Here, among the routers 110, 112, and 120, router 1 (R1) 110 and router 2 (R2) 112 are routers provided for duplication of the router according to an embodiment of the present invention, and router 3 (R3) 120 ) Is a higher router connected to Router 1 (R1) 110 and Router 2 (R2) 112.

Multi-Service Provisioning Platform (MSPP) 200,300 is provided for circuit redundancy and protection switching of EoS (Ethernet Over SDH / SONET) line cards 130,132,140,142 in MSPP 200,300 according to an embodiment of the present invention.

The Ethernet Over SDH / SONET (EoS) line card (130, 132, 140, 142) is provided in the MSPP (200, 300) to set the protection switching between the main line and the auxiliary line between the host 150, 152 and the router (110, 112) under the control of the MSPP (200, 300). do. To this end, MSPP (200, 300) determines whether the main line of the EoS line card (130, 132, 140, 142) failure occurs, and determines and controls the protection switching of the line. In the present embodiment, at least two EoS line cards 130, 132, 140, and 142 provided in the MSPPs 200 and 300 may be provided for each MSPP.

The hosts 150 and 152 are end terminals for receiving the service provided along the circuit. In this case, the hosts 150 and 152 may be replaced by routers corresponding to the routers 110 and 112 located at opposite ends.

According to an embodiment of the present invention, the operation of the MSPP 200 for redundancy of an EoS line and a router is as follows.

The MSPP router duplication system 100 of the present invention requires the operator to configure and manage the duplication point of each EoS line card line for duplication service. Accordingly, the MSPP2 200 will operate the protection switching mode of the main line and the spare line in the resilient mode for the redundant lines of the EoS line card 3 140 and the EoS line card 4 142 equipment. Set whether to operate in non-recursive mode. In addition, the MSPP2 200 provides additional functions such as Wait To Restore (WTR) time and forced switching for convenience of network management.

In the figure, the main line of the redundant line is a portion indicated by a solid line, and the preliminary line is indicated by a dotted line. Accordingly, the path of the main line of the host 1 150 is a path transmitted to the router 1 101 via the EoS line card 3 140 and the EoS line card 1 130. In addition, the path of the preliminary line of the host 1 150 is a path transmitted to the router 2 112 via the EoS line card 3 (140) and the EoS line card 2 (132). Meanwhile, the path of the main line of the host 2 152 is a path transmitted to the router 1 110 via the EoS line card 4 1142 and the EoS line card 1 130. In addition, the path of the preliminary line of the host 2 152 is a path transmitted to the router 2 112 via the EoS line card 4 142 and the EoS line card 2 132.

2 is a block diagram illustrating a detailed configuration of the MSPP2 200 of FIG. 1 for providing a line duplication service of an EoS line card according to an embodiment of the present invention.

As shown, the MSPP2 200 includes a protection switching controller 210, a physical layer (PHY) controller 230, and a physical layer (PHY) module 250. In the present embodiment, the MSPP2 200 may further include a Media Access Control Layer (MAC) control unit 270 and a Link Loss Carry Forward (LLFC) control unit 290.

The protection switching controller 210 controls the overall operation for redundancy and protection switching of the EoS line cards 140 and 142.

The physical layer (PHY) module 250 monitors the status of ports connected to the EoS line cards 130 and 132 and the hosts 1 and 2 (150 and 152).

The physical layer (PHY) controller 230 monitors the state of the physical layer (PHY) module 250 and monitors the port states of the main line and the spare line in the EoS line cards 140 and 142 according to the port state monitoring of the physical layer module 250. Watch.

Accordingly, the protection switching control unit 210 determines whether the EoS line card (140, 142) line of the failure based on the monitoring result of the physical layer control unit 230, determines the transfer and restoration of the line according to the determination and the line according to the determination The physical layer controller 230 that performs the switching and restoration operation is controlled.

The media access control layer (MAC) control unit 270 floods the media access control layer (MAC) running information to the previously used line when the state of the main line and the spare line of the EoS line cards 140 and 142 changes. So that line switching takes place immediately. In addition, when the main line of the EoS line cards 140 and 142 is normal, the medium access control layer control unit 270 maintains the transmission / reception state of the medium access control layer (MAC) in a block state for the preliminary line. .

The LLCF controller 290 is a physical layer (PHY) controller if the main line and the spare line of the EoS line cards 140 and 142 are designated as ports capable of operating an Link Loss Carry Forward (LLPF). By requesting a port reset of the corresponding port at 230, the routers 110 and 112 may detect that the state of the corresponding port has changed, and thus may quickly change the state.

3 is a flowchart illustrating a processing procedure for the redundancy redundancy of an EoS line card line using MSPP according to a preferred embodiment of the present invention.

As shown, first, the protection switching controller 210 initializes the ports for the main line and the spare line of the EoS line cards 140 and 142 for resilience control (S300). Specifically, the protection switching control unit 210 obtains information from the physical layer (PHY) control unit 230 of the state of the corresponding port for the ports of the main line and the spare line of the EoS line cards 140 and 142 received from the operator. At this time, the protection switching control unit 210 controls the medium access control layer (MAC) control unit 270 of the port of the spare line to block the transmission / reception of the corresponding port, and immediately fail the link of the physical state of the corresponding port. -Fail) to minimize LLCF operation time.

Subsequently, the protection switching control unit 210 determines whether the operator forcibly requests the transfer of the EoS line card (140, 142) line (S301). If it is determined that the operator requests the switching of the EoS line card (140, 142) line, the protection switching control unit 210 determines whether the transfer to the corresponding ports of the EoS line card (130, 132) and the router (110, 112). (S302). If it is determined that switching to the corresponding ports of the EoS line card (130,132) and routers (110,112) is possible, the protection switching control unit 210 switches the line of the EoS line card (140,142) to the corresponding port physical layer control unit 230 To control (S307). Accordingly, the physical layer controller 230 switches the lines of the EoS line cards 140 and 142 under the control of the protection switching controller 210.

On the other hand, the protection switching control unit 210 monitors the physical layer control unit 230, if a forced line transfer command is not input from the operator to determine whether the failure of the main line of the EoS line card (140, 142) (S302). If it is determined that the main line of the EoS line card (140, 142) is a failure, the protection switching control unit 210 determines whether or not line switching to the preliminary line of the EoS line card (140, 142) is possible (S305). If it is determined that line switching is possible with the preliminary lines of the EoS line cards 140 and 142, the protection switching controller 210 controls the physical layer control unit 230 to immediately perform the transfer of the EoS line cards 140 and 142 to the preliminary lines ( S308).

After switching to the preliminary lines of the EoS line cards 140 and 142, the protection switching control unit 210 monitors the physical layer control unit 230 during the use of the preliminary line to determine whether the main line is recovered from the failure and can be used. (S303). If it is determined that the main line has been recovered from the failure and can be used, the protection switching control unit 210 maintains the main to the WTR (Wait To Restore) time set by the operator to transfer the transfer to the main line of the EoS line cards 140 and 142. It is determined whether the line is kept stable (S306). If it is determined that the main line of the EoS line cards 140 and 142 is stably maintained for the WTR time set by the operator, the protection switching control unit 210 controls the physical layer control unit 230 to switch from the preliminary line to the main line. (S309). This is to maintain the circuit in a stable reserve circuit without attempting to recover to the main circuit when the main circuit is restored but the network is not stable by repeating the failure and recovery state.

On the other hand, the protection switching control unit 210 determines that the transfer of the corresponding port is connected to the router (110, 112) when the switching is performed because the state of the main line and the spare line of the EoS line card (140,142) is changed (S310). ). If it is determined that the transferred port is interlocked with the routers 110 and 112, the protection switching control unit 210 changes the state of the EoS line card so as to recognize the state change of the corresponding port transferred from the routers 110 and 112. The physical layer controller 230 is controlled to perform port reset on the ports 140 and 142 (S311). Accordingly, the routers 110 and 112 recognize the state change of the corresponding port due to the circuit protection switching of the EoS line cards 140 and 142, and communicate with the changed port.

Subsequently, the protection switching controller 210 repeatedly performs steps S301 to S311 to control the line protection switching according to the line state of the EoS line cards 140 and 142.

4 is a flowchart illustrating a processing procedure for non-recursive redundancy of an EoS line card line using MSPP according to an embodiment of the present invention.

In the non-resilience mode according to the present embodiment, the main line and the spare line of the EoS line cards 140 and 142 are set, but since the return to the main line is not performed, the state is controlled by periodically monitoring only the state of the line currently being used. do.

First, the protection switching controller 210 initializes the ports for the main line and the spare line of the EoS line cards 140 and 142 for non-returnability control (S400). Specifically, the protection switching control unit 210 obtains information from the physical layer (PHY) control unit 230 of the state of the corresponding port for the ports of the main line and the spare line of the EoS line cards 140 and 142 received from the operator. At this time, the protection switching control unit 210 controls the medium access control layer (MAC) control unit 270 of the port of the spare line to block the transmission / reception of the corresponding port, and immediately fail the link of the physical state of the corresponding port. -Fail) to minimize LLCF operation time.

The protection switching control unit 210 determines whether a forced transfer of the EoS line cards 140 and 142 is required by the operator setting as in the resilience mode (S401). When it is determined that the forced transfer is requested, the protection transfer control unit 210 determines whether transfer is possible to the corresponding port of the EoS line cards 140 and 142 (S403). If it is determined that the transfer is possible, the protection switching controller 210 controls the physical layer controller 230 to perform the transfer to the corresponding port that can be switched of the EoS line card (140,142) (S405).

On the other hand, the protection switching control unit 210 obtains information from the physical layer (PHY) control unit 230 whether or not the line of the EoS line card (140,142) currently in use, if a forced transfer request is not input from the operator It is determined (S402). If it is determined that a failure occurs in the line currently being used, the protection switching control unit 210 controls the physical layer control unit 230 to immediately switch the line to another line of the EoS line cards 140 and 142 (S404).

The protection switching controller 210 resets the ports of the EoS line cards 140 and 142 in order to quickly reflect the state to the routers 110 and 112 when a state change occurs in the corresponding port as in the resilience mode (S406). The physical layer (PHY) controller 230 is controlled to recognize the change of the port (S407). Subsequently, the protection switching control unit 210 repeats steps S401 to S407 to control the line protection switching according to the line state of the EoS line cards 140 and 142.

In the above, specific preferred embodiments of the present invention have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and any person having ordinary skill in the art to which the present invention pertains may make various modifications and equivalents without departing from the gist of the present invention attached to the claims. Other implementations may be possible. Therefore, the true technical protection scope of the present invention should be defined only by the appended claims.

110, 112: Routers 120, 132, 140, 142: EoS
150,152: host 200, 300: MSPP
210: protection switching control unit 230: physical layer control unit
250: physical layer module 270: MAC control unit
290: LLCF control unit

Claims (12)

Multi-Service Provisioning Platform (MSPP), which controls the switching of circuits between multiple routers and hosts,
Determining whether the main line of the EoS (Ethernet Over SDH / SONET) line card provided in the MSPP has a main line and an auxiliary line that can be switched with the router;
If it is determined that a failure occurs in the main line, determining whether the auxiliary line of the EoS line card is in a state where line switching is possible;
Switching the circuit to the auxiliary line if it is determined that the auxiliary line is capable of circuit switching; And
And resetting a port of the auxiliary line so that a router connected to the auxiliary line is aware of a change in state due to the circuit changeover.
The method of claim 1,
The port of the secondary line to be reset is a Link Loss Carry Forward (LLFC) port characterized in that the duplex EoS line and router.
The method of claim 1,
Determining whether the main line is normally returned and kept stable for a predetermined time while the line is switched to the auxiliary line and is in use; And
If it is determined that the stability is maintained for the set time, the method for the duplication of the EoS line and router further comprising the step of switching the line connected to the auxiliary line to the main line.
The method of claim 3, wherein
If the circuit is switched to the main line, the method further comprises maintaining a block state so that transmission / reception of the auxiliary line through the medium access control layer is blocked.
The method of claim 3, wherein
The set time is a WTR (Wait To Restore) time, characterized in that the duplex EoS circuit and router.
A host for receiving a service along a connected line;
A Multi-Service Provisioning Platform (MSPP) 2 for controlling circuit switching of the EoS by having an Ethernet over SDH / SONET (EoS) circuit connected to the host and having a main line and an auxiliary line;
Multi-Service Provisioning Platform (MSPP) 1 having an EoS1 connectable to the main line and an EoS2 connectable to the auxiliary line;
Router 1 connected to the EoS1 and Router 2 connected to the EoS2; And
And upper router 3 connected to the router 1 and the router 2;
The MSPP2 is a system for redundancy of an EoS circuit and a router, wherein the MSPP2 is switched to connect to the EoS2 via the auxiliary line when a failure occurs in the main line connected to the EoS1.
The method of claim 6,
MSPP2 is,
After the circuit is switched through the auxiliary line, the EoS circuit is characterized in that the router 1 connected to the auxiliary line is reset by resetting the port of the auxiliary line so as to recognize a state change according to the circuit switching. Router redundancy system.
The method of claim 6,
MSPP2 is,
When the main line is returned to normal state and is maintained in a stable state for a predetermined time while the circuit is switched to the auxiliary line and is in use, switching the line connected through the auxiliary line to the EoS1 through the main line. Redundant system of EoS line and router characterized by.
In the Multi-Service Provisioning Platform (MSPP) for redundancy of EoS circuits and routers through the switching of circuits between multiple routers and hosts,
A physical layer controller provided in the MSPP and monitoring a connection port state of an Ethernet over SDH / SONET (EoS) line card having a main line and an auxiliary line that can be switched to the router;
A protection switching controller for switching a line to the auxiliary line of the EoS line card when a failure occurs in the main line according to the connection port state monitoring; And
And an LLCF control unit for resetting the port of the circuit switched in the auxiliary line, so that the router connected to the auxiliary line is aware of the state change due to the circuit switching.
The method of claim 9,
Port of the secondary line to be reset is characterized in that the Link Loss Carry Forward (LLFC) port.
The method of claim 9,
The protection switching control unit,
In a state where a line is switched to the auxiliary line and is in use,
And when the main line returns to the normal state and remains stable for a predetermined time, the circuit connected to the auxiliary line is switched to the main line.
12. The method of claim 11,
The apparatus further includes a medium access control layer (MAC) control unit which maintains a block state so that transmission / reception of the auxiliary line is blocked under the control of the protection switching controller. MSPP.

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