JP2003258844A - Network termination device for internet protocol network and redundant system operation method - Google Patents

Abstract

(57) Abstract: A network termination device for an IP network and a redundant system operation method, in which a call is passed to a backup device without squeezing processing capacity, and a session is performed when the active system is switched to the backup system. Remedy without disconnecting the established communication. SOLUTION: When a session request is sent from a terminal device 16 to a PPP terminating device 11, a call processing control unit 21 instructs a session control unit 22 to establish a PPP session, and instructs a routing table control unit 23 to set call information. Set the call information in the routing table. Thereafter, the cycle matching control unit 26 activates the routing table transmitting unit 27 of the active device 12 at a fixed period, collects call information via the routing table control unit 23, and transmits the call information to the standby device 13. The standby system device 13 receives the call information transmitted periodically, sets the received call information in a routing table in the standby system device 13, and adjusts the call information so that it matches the active system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network terminating device of an internet protocol (hereinafter referred to as "IP") network and a redundant system operating method thereof. In recent years, IP
The rapid increase of traffic in the network is remarkable, and a method for efficiently constructing a highly reliable network is required. The present invention is particularly applicable to duplexed P over IP networks.
In a PP (Point to Point Protocol) network terminating device, the connection service is efficiently maintained when the device fails.

[0002]

2. Description of the Related Art FIG. 8 shows a redundant configuration of a conventional IP network terminating device. In FIG. 8, 11 is a PPP network terminating device in an IP network, 12 is a working system device in the PPP network terminating device 11, and 13 is a PPP network terminating device 11.
Is a main device in the PPP network termination device 11, 15 is an xDSL modem connected to the PPP network termination device 11 via the IP network, and 16 is x
A terminal device connected to the DSL modem 15 by a digital subscriber line, 17 is a memory in the active system device 12 of the PPP network terminating device 11, and 18 is a memory in the standby system device 13 of the PPP network terminating device 11.

FIG. 8A shows a redundant configuration system in which call information is retained only in the active system, and FIG. 8B shows a redundant configuration system in which call information is retained in both the active and standby systems. Is shown. First, in the redundant configuration system shown in FIG.
When a PPP session is established between the terminal device 16 and the PPP network terminating device 11, call information related to the session is set in the memory 17 in the active system device 12 of the PPP network terminating device 11.

When the main processor 14 of the PPP network terminating device 11 detects the failure of the active system device 12, it switches the active system device 12 to the standby system device 13, and thereby the PP
The P network terminating device 11 can provide a connection service even after a failure occurs. However, at this time, the session of the already established call is temporarily disconnected.

On the other hand, in the redundant configuration system shown in FIG. 1B, there is a P between the terminal device 16 and the PPP network terminating device 11.
When the PP session is established, the call information related to the session is set in the memory 17 in the active system device 12 and the call information is set in the memory 18 in the standby system device 13 at the same time.

The main processor 14 is an active system device 12.
When a failure is detected, the active system device 12 is replaced with the standby system device 13
To the PPP network terminating device 11 so that the PPP network terminating device 11 can continue the connection service. At this time, the communication of the already established call is maintained as it is without being disconnected.

[0007]

In the conventional redundant configuration system in which the call information is held only by the active system device 12, the call information is not set in the standby system device 13, so that a standby system is generated due to the occurrence of a failure. When switching to the device 13, the call being communicated cannot be rescued. On the other hand, call information is used for the active system 1
In the redundant configuration method in which the backup system 2 and the standby system 13 hold the call information, it is necessary to transfer the call information to the standby system device 13 on a call-by-call basis. Will end up.

In the present invention, the call information is taken over to the standby system device without overwhelming the processing capacity, and the call communication during the session establishment is disconnected when the active system device is switched to the standby system device at the time of failure. It is an object of the present invention to provide an IP network terminal device that can be relieved without any trouble.

[0009]

A network terminating device for an internet protocol network according to the present invention is (1) a network terminating device on an internet protocol network, the network terminating device comprising an active system device and a standby system device. A means for periodically transmitting the call information set in the active system device to the standby system device, and a means for setting the call information in the standby system device in accordance with the call information transmitted from the active system device, When the active system device is switched to the standby system device, means for continuing the connection service to the call for which the session is being established is provided based on the call information set in the standby system device.

(2) In a network terminating device on the Internet protocol network, which comprises an active system device and a standby system device, the call information set in the active system device is transferred to the standby system device. , Means for intermittently transmitting when the processing load of the active system device is in a light load state, means for setting call information to the standby system device in accordance with the call information transmitted from the active system device, and the active system When switching the device to the standby system device, a means for continuing the connection service for the call during the session establishment based on the call information set in the standby system device is provided.

Further, (3) a means is provided for transmitting the difference information of the previously transmitted call information when transmitting the call information set in the active system apparatus to the standby system apparatus.

Further, the redundant system operating method of the network terminating device of the Internet protocol network of the present invention is (4)
A step of periodically transmitting the call information set in the active system device to the standby system device; a step of setting the call information in the standby system device in accordance with the call information transmitted from the active system device; When switching the system device to the standby system device, the step of continuing the connection service to the call for which the session is being established based on the call information set in the standby system device.

Further, (5) a step of intermittently transmitting information on a call set in the active system device to the standby system device when the processing load of the active system device is in a light load state; and transmitting from the active system device. The step of setting the call information in the standby system device according to the information of the established call, and the session establishment based on the call information set in the standby system device when the active system device is switched to the standby system device. Continuing the connection service for the call.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a redundant configuration and processing sequence of an IP network termination device according to the present invention. In the figure, 11 is a PPP network terminating device, 12 is a working system device in the PPP network terminating device 11, and 13 is a PPP network terminating device 1.
A backup system device 1 and a terminal device 16 are the same as those shown in FIG.

Further, in FIG. 1, reference numeral 21 denotes a call processing control unit,
22 is a session control unit, 23 is a routing table (RT) control unit, and 24 is a routing table (RT).
An access unit, 26 is a cycle adjustment control unit, 27 is an active routing table (RT) transmitting unit, and 28 is a standby routing table (RT) receiving unit.

In FIG. 1, first, from the terminal device 16 to P
When the session request is transmitted to the PP termination device 11, the call processing control unit 21 instructs the session control unit 22 to establish the PPP session. When the PPP session is established, the routing table (RT) control unit 23 is instructed to set the routing table.

Routing table (RT) controller 23
Then, the call information related to the session is set in the routing table according to the setting instruction. FIG. 3 shows a configuration example of the routing table. Routing table (R
T) As shown in FIG. 3, the control unit 23 sets, as the call information for one call, the exit port number 32 and the packet destination information 33 corresponding to the entrance channel number 31 in the routing table.

In the routing table of FIG. 3, the ingress channel number 31 indicates the ingress channel position of the PPP network terminating device 11 and the egress port number 32 indicates the egress port position of the PPP network terminating device 11. Also,
The packet destination information 33 indicates information about a packet transmission destination which is a connection destination of the call.

Thereafter, the period adjustment control unit 26 activates the routing table (RT) transmission unit 27 of the active system device 12 at a constant interval period. The active routing table (RT) transmission unit 27 collects the current routing table (RT) information from the routing table (RT) control unit 23 and transfers it to the standby device 13.

In the standby system device 13, the standby system routing table (RT) receiving section 28 has the above-mentioned active system device 12
Table (RT) that is periodically transferred from the
Receive information. Standby system routing table (RT)
The receiver 28 receives the received routing table (RT).
Information is stored in the routing table (R
T). With such a processing sequence, the routing table (RT) of the standby system device 13 can be adjusted so as to match the routing table (RT) of the active system device 12.

FIG. 2 shows main functional blocks provided in the redundant network terminating device according to the present invention. In the figure, reference numeral 21 denotes a call processing control unit that accepts a call when a call is made and performs call processing,
22 is a session control unit that controls session establishment for outgoing calls, 23 is a routing table control unit that controls a routing table that stores call information, 24 is a routing table access unit that controls access to the routing table, and 25 is routing. table,
Reference numeral 26 is a cycle adjustment control unit for periodically rewriting the standby routing table by the active routing table, and 27 is an active routing table (RT) acquired from the routing table control unit 23 and transmitted to the standby system. System routing table (R
T) transmitter, 28 is the active routing table (R
Reference numeral T denotes a standby routing table (RT) receiver that rewrites the routing table with the active routing table (RT) sent from the transmitter, and 49 denotes a failure controller.

The operation of the redundant system of the present invention will be described with reference to FIGS. (I) First, when a PPP session is established between the terminal device 16 and the PPP network terminating device 11, the call information is set in the routing table of the memory 17 in the active system device 12 (see FIG. 4). . (Ii) Next, at regular intervals, the call information of the active system device 12 is transferred to the standby system device 13, and the same call information is set in the memory 18 in the standby system device 13 ( (See FIG. 5). (Iii) In this state, when the main processor 14 detects a failure of the active system device 12, the main processor 14
Switches to the standby system device 13 (see FIG. 6). (Iv) Since the call information is set in advance in the memory 18 in the standby system device 13, the PPP network terminating device 11 can continue the connection service for the call during the session establishment. At this time, the call communication already established is maintained (see FIG. 7).

It is to be noted that, instead of the above-described configuration in which the routing table (RT) transmission unit 27 of the active system device 12 is activated by the cycle adjustment control unit 26 at a constant interval, it is determined whether the processing load of the active system device is light or heavy. It is also possible to provide a means for doing so and activate the routing table (RT) transmission unit 27 of the active system device 12 in the light load state.

Also, in a large-scale network terminal device, the number of ingress channels becomes several thousand, and the routing table (R
The amount of information in T) 25 is enormous. Therefore, when the call information is transmitted to the standby system device, the difference information of the previously transmitted call information is transmitted so that the amount of information to be transmitted is greatly reduced.

[0025]

As described above, according to the present invention,
By transmitting the call information of the active system device to the standby system device at regular intervals or intermittently when the processing load is light, the standby system device can be efficiently used with the standby system device without compressing the processing capacity. It is possible to combine call information with the system device, and to maintain the connection without disconnecting the call that has already been established when the active system device fails and switches to the standby system device. it can.

[Brief description of drawings]

FIG. 1 is a diagram showing a redundant configuration and a processing sequence of an IP network network terminating device of the present invention.

FIG. 2 is a diagram showing main functional blocks included in a redundant network termination device according to the present invention.

FIG. 3 is a diagram showing a configuration example of a routing table.

FIG. 4 is an explanatory diagram of a redundant system operation (i) of the present invention.

FIG. 5 is an explanatory diagram of a redundant system operation (ii) of the present invention.

FIG. 6 is an explanatory diagram of a redundant system operation operation (iii) of the present invention.

FIG. 7 is an explanatory diagram of a redundant system operation operation (iv) of the present invention.

FIG. 8 is a diagram showing a redundant configuration of a conventional IP network termination device.

[Explanation of symbols]

11 PPP network terminating device 12 Working device in PPP network terminating device 13 Standby device in PPP network terminating device 14 Main processor 15 x DSL modem 16 terminal devices 17 Memory of active system 18 Memory of spare device 21 Call processing control unit 22 Session control unit 23 Routing Table (RT) Control Unit 24 Routing table (RT) access unit 25 Routing table (RT) 26 Cycle Adjustment Control Unit 26 27 Working routing table (RT) transmitter 28 Standby system routing table (RT) receiver 31 Entrance channel number 32 Exit port number 33 packet destination information

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masaaki Hosoda             4-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa             No. 1 within Fujitsu Limited (72) Inventor Atsuko Mori             4-1, Kamiodanaka, Nakahara-ku, Kawasaki-shi, Kanagawa             No. 1 within Fujitsu Limited (72) Inventor Yasuo Tezuka             3-9-18 Shin-Yokohama, Kohoku Ward, Yokohama City, Kanagawa Prefecture             Fujitsu Communication System             Within Co., Ltd. (72) Inventor Shinya Narita             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation (72) Inventor Senji Kawamura             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 5K030 JA08 MA08 MD02                 5K033 CB08 DA06 EA03 EA04 EB06

Claims (5)

[Claims] 1. A network terminating device on an internet protocol network, comprising: a network terminating device comprising an active system device and a standby system device, wherein call information set to the active system device is periodically transmitted to the standby system device. A means for transmitting, a means for setting the call information in the standby system device in accordance with the call information transmitted from the active system device, and a means for setting the standby system device when the active system device is switched to the standby system device. A network terminating device for an internet protocol network, comprising: means for continuing a connection service for a call whose session is being established based on call information. 2. A network terminating device on an internet protocol network, comprising a working system device and a protection system device, wherein call information set in the working system device is transferred to the protection system device. A means for intermittently transmitting when the processing load of the equipment is in a light load state, a means for setting the call information in the standby equipment in accordance with the call information transmitted from the active equipment, and a standby for the active equipment. A network terminating device of an internet protocol network, comprising means for continuing connection service for a call during session establishment based on call information set in the standby device when switching to the system device. . 3. When the call information set in the active system device is transmitted to the standby system device, a means for transmitting the difference information of the previously transmitted call information is provided. Or a network terminating device of the internet protocol network according to item 2. 4. In a redundant system operation method of a network terminating device on an Internet protocol network, the network terminating device comprising an active system device and a standby system device, call information set in the active system device is used as a standby system device. Periodically, the step of setting the call information in the standby system device according to the call information transmitted from the active system device, and the standby system device when switching the active system device to the standby system device. And a step of continuing connection service to a call for which a session is being established based on the call information set in step 1), a redundant system operation method for a network terminating device of an internet protocol network. 5. In a redundant system operation method of a network terminating device on an internet protocol network, the network terminating device comprising an active system device and a standby system device, call information set in the active system device is used as a standby system device. The step of intermittently transmitting when the processing load of the active system device is in a light load state, the step of setting the call information in the standby system device according to the call information transmitted from the active system device, When switching the system device to the standby system device, the step of continuing the connection service to the call for which the session is being established based on the call information set in the standby system device. Redundant operation method of network terminating equipment.