CN106034043B - Method and device for improving multiplex section switching frequency in packet transport network - Google Patents

Method and device for improving multiplex section switching frequency in packet transport network Download PDF

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CN106034043B
CN106034043B CN201510119981.6A CN201510119981A CN106034043B CN 106034043 B CN106034043 B CN 106034043B CN 201510119981 A CN201510119981 A CN 201510119981A CN 106034043 B CN106034043 B CN 106034043B
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state
working port
control word
time division
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CN106034043A (en
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张禹
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H04L41/08—Configuration management of networks or network elements
    • H04L41/0803—Configuration setting
    • H04L41/0823—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability
    • H04L41/0836—Configuration setting characterised by the purposes of a change of settings, e.g. optimising configuration for enhancing reliability to enhance reliability, e.g. reduce downtime
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L45/00—Routing or path finding of packets in data switching networks
    • H04L45/68—Pseudowire emulation, e.g. IETF WG PWE3
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L49/00—Packet switching elements
    • H04L49/25—Routing or path finding in a switch fabric
    • H04L49/256—Routing or path finding in ATM switching fabrics
    • H04L49/258—Grouping

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

The invention discloses a method and a device for improving the switching frequency of a multiplexing section in a packet transport network, which relate to the field of packet transport networks, and the method comprises the following steps: acquiring the protection state of a multiplex section protection group; and processing and enabling pseudo wire control words of the time division multiplexing simulation service on a working port in a working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group, and processing and disabling the pseudo wire control words of the time division multiplexing simulation service on a non-working port in a non-working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group. The invention can reduce the service interruption time by providing a method for improving the switching efficiency of the multiplex section protection.

Description

Method and device for improving multiplex section switching frequency in packet transport network
Technical Field
The invention relates to the field of Packet Transport Networks (PTN), in particular to a method and a device for improving switching efficiency after Time Division Multiplexing (TDM) simulation service configuration Multiplexing section protection.
Background
With the evolution of technology, the bearer network gradually evolves towards the direction of Protocol (IP: Internet Protocol) interconnection between the whole networks, and in order to be compatible with a large amount of existing TDM devices, the PTN device must have the capability of accessing to the traditional Synchronous Digital Hierarchy (SDH) service, and must also be compatible with the traditional SDH protection technology, so that the PTN device realizes linear multiplexing segment protection. After the protection of the multiplex section is realized in the PTN network, the problem that the switching time is out of standard easily occurs when the traffic volume is large because the service carrying manner is greatly different from that of the conventional SDH network.
All the TDM services carried in the PTN network have processes for implementing control words, where L bit is a bit of a control word, and the existing related processes are as follows:
(1) and the client side sets the L bit set after detecting that the signal is invalid, and cancels the L bit set after detecting that the client signal is recovered.
(2) When the L bit of the received pseudo wire message is detected to be set at the network side, the client signal at the far end is considered to be invalid, and an alarm needs to be inserted into the client side at the local end.
(3) When the data on the network side is interrupted, an alarm needs to be inserted into the client side of the TDM service.
Since some alarms at the client side or the network side inevitably occur in the process of switching the multiplex section, the functions related to the control words increase some complexity when participating in the service processing in the process, and finally the switching time exceeds the standard.
Disclosure of Invention
The invention aims to provide a method and a device for improving the switching frequency of a multiplexing section in a packet transport network, which can solve the problem that the switching time exceeds the standard when the traffic is large after the multiplexing section protection is realized in a PTN network.
According to an aspect of the present invention, a method for improving switching efficiency of a protection group of a multiplex section in a packet transport network is provided, including:
acquiring the protection state of a multiplex section protection group;
enabling the pseudo wire control word processing of the time division multiplexing emulation service on the working port in the working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group, and
and processing and disabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port in the non-working state in the multiplexing section protection group according to the acquired protection state of the multiplexing section protection group.
Preferably, the method further comprises the following steps:
after the pseudo wire control word processing of the time division multiplexing simulation service is subjected to the enabling and disabling processing, polling the current states of a working port in a working state and a non-working port in a non-working state in a multiplexing section protection group;
and if the current state of the working port or the non-working port is found to be changed through polling, changing the pseudo wire control word processing of the time division multiplexing simulation service.
Preferably, the method further comprises the following steps: and if the current state of the working port or the non-working port is not changed through polling, maintaining the pseudo wire control word processing of the time division multiplexing simulation service.
Preferably, the polling current states of the working port in the working state and the non-working port in the non-working state in the protection group of the multiplex section includes:
presetting a timer, and polling the current states of the working port in the working state and the non-working port in the non-working state in the multiplex section protection group according to the configured timing period.
Preferably, if the current status of the working port or the non-working port is found to be changed by polling, the step of changing the pseudowire control word processing of the time division multiplexing emulation service includes:
if the working port is switched from the working state to the non-working state, processing the pseudo wire control word of the time division multiplexing simulation service on the working port switched to the non-working state to enable the pseudo wire control word;
and if the non-working port is switched from the non-working state to the working state, processing and enabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port switched to the working state after delaying preset time.
Preferably, the step of disabling pseudowire control word processing of the time division multiplexing emulation service on the working port switched to the non-working state further includes:
and if the L bit setting in the time division multiplexing simulation service pseudo-line message on the working port switched to the non-working state is detected, eliminating the alarm set to the client side according to the L bit setting.
According to another aspect of the present invention, an apparatus for improving switching efficiency of a protection group of a multiplex section in a packet transport network is provided, including:
the acquisition module is used for acquiring the protection state of the multiplex section protection group;
an enabling module, configured to enable, according to the obtained protection state of the protection group in the multiplexing segment, processing of a pseudo-wire control word of a time division multiplexing emulation service on a working port in a working state in the protection group in the multiplexing segment, and
and the de-enabling module is used for processing and de-enabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port in the non-working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group.
Preferably, the method further comprises the following steps:
the polling module is used for polling the current states of the working port in the working state and the non-working port in the non-working state in the multiplex section protection group after the enabling and the disabling of the pseudo wire control word processing of the time division multiplex emulation service;
and the changing module is used for changing the pseudowire control word processing of the time division multiplexing simulation service if the current state of the working port or the non-working port is found to be changed through polling.
Preferably, the changing module further comprises:
the first switching submodule is used for processing and disabling the pseudo wire control word of the time division multiplexing simulation service on the working port switched to the non-working state if the working port is switched to the non-working state from the working state;
and the second switching submodule is used for enabling the processing of the pseudo wire control word of the time division multiplexing simulation service on the non-working port switched to the working state after delaying preset time if the non-working port is switched to the working state from the non-working state.
Preferably, the first switching sub-module further includes:
and the clearing unit is used for eliminating the alarm set to the client side according to the L bit set if the L bit set in the time division multiplexing simulation service pseudo-line message on the working port switched to the non-working state is detected.
Compared with the prior art, the invention has the beneficial effects that: the method for improving the switching efficiency of the multiplex section protection can be provided, and the service interruption time can be reduced.
Drawings
Fig. 1 is a schematic diagram of a method for increasing a switching frequency of a multiplexing section in a packet transport network according to an embodiment of the present invention;
fig. 2 is a structural diagram of an apparatus for increasing a switching frequency of a multiplexing section in a packet transport network according to an embodiment of the present invention;
fig. 3 is a schematic diagram of each processing unit for increasing the switching frequency of the multiplexing section in the packet transport network and an interaction relationship therebetween according to an embodiment of the present invention;
fig. 4 is a control flowchart for increasing the switching frequency of the multiplexing section in the packet transport network according to the embodiment of the present invention;
fig. 5 is an operation flowchart for increasing the switching frequency of the multiplex section in the packet transport network according to the embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described below are only for the purpose of illustrating and explaining the present invention, and are not to be construed as limiting the present invention.
Fig. 1 is a schematic diagram of a method for increasing a switching frequency of a multiplex section in a packet transport network according to an embodiment of the present invention, and as shown in fig. 1, the specific steps are as follows:
step S101: and acquiring the protection state of the multiplex section protection group.
Step S102: and processing and enabling the pseudo wire control word of the time division multiplexing simulation service on the working port in the working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group.
Step S103: and processing and disabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port in the non-working state in the multiplexing section protection group according to the acquired protection state of the multiplexing section protection group.
Step S104: and after the pseudo wire control word processing of the time division multiplexing simulation service is subjected to the enabling and disabling processing, polling the current states of the working port in the working state and the non-working port in the non-working state in the multiplexing section protection group.
In step S104, the polling the current states of the working port in the working state and the non-working port in the non-working state in the protection group of the multiplex section includes:
presetting a timer, and polling the current states of the working port in the working state and the non-working port in the non-working state in the multiplex section protection group according to the configured timing period.
Step S105: and if the current state of the working port or the non-working port is found to be changed through polling, changing the pseudo wire control word processing of the time division multiplexing simulation service.
In step S105, the method further includes: and if the current state of the working port or the non-working port is not changed through polling, maintaining the pseudo wire control word processing of the time division multiplexing simulation service.
Further, if the current state of the working port or the non-working port is found to be changed by polling, the step of changing the pseudowire control word processing of the time division multiplexing emulation service includes:
if the working port is switched from the working state to the non-working state, processing the pseudo wire control word of the time division multiplexing simulation service on the working port switched to the non-working state to enable the pseudo wire control word;
and if the non-working port is switched from the non-working state to the working state, processing and enabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port switched to the working state after delaying preset time.
Further, the step of disabling pseudowire control word processing for the time division multiplexing emulation service on the working port switched to the non-working state further includes:
and if the L bit setting in the time division multiplexing simulation service pseudo-line message on the working port switched to the non-working state is detected, eliminating the alarm set to the client side according to the L bit setting.
Fig. 2 is a structural diagram of a device for increasing a switching frequency of a multiplexing section in a packet transport network according to an embodiment of the present invention, as shown in fig. 2, including: an acquisition module 20, an enabling module 21, a disabling module 22, a polling module 23 and a changing module 24.
The obtaining module 20 is configured to obtain a protection status of a protection group of a multiplexing section.
The enabling module 21 is configured to enable processing of a pseudo wire control word of a time division multiplexing emulation service on a working port in a working state in a multiplexing segment protection group according to the obtained protection state of the multiplexing segment protection group.
The disabling module 22 is configured to disable processing of a pseudowire control word of a time division multiplexing emulation service on a non-working port in a non-working state in a multiplexing segment protection group according to the obtained protection state of the multiplexing segment protection group.
The polling module 23 is configured to poll the current states of the working port in the working state and the non-working port in the non-working state in the multiplex section protection group after the enabling and the disabling of the pseudowire control word processing of the time division multiplexing emulation service are performed.
The changing module 24 is configured to change pseudowire control word processing of the time division multiplexing emulation service if it is found through polling that the current state of the working port or the non-working port changes. The first switching submodule of the changing module is used for processing and disabling the pseudo wire control word of the time division multiplexing simulation service on the working port switched to the non-working state if the working port is switched to the non-working state from the working state. And the second switching submodule of the changing module is used for enabling the processing of the pseudo wire control word of the time division multiplexing simulation service on the non-working port switched to the working state after delaying preset time if the non-working port is switched to the working state from the non-working state. And the clearing unit of the first switching submodule is used for eliminating the alarm set to the client side according to the L bit if the L bit in the time division multiplexing simulation service pseudo-line message switched to the non-working state on the working port is detected.
Fig. 3 is a schematic diagram of each processing unit for increasing the switching frequency of the multiplexing section in the packet transport network and the interaction relationship thereof, which is provided in the embodiment of the present invention, and as shown in fig. 3, the processing unit includes: an emulated service processing unit 30, a control word processing unit 31, a multiplex section protection control unit 32 and a control word processing enable control unit 33.
The emulation service processing unit 30 is responsible for encapsulating and decapsulating the TDM emulation service pseudo wire packet.
The control word processing unit 31 is responsible for processing the pseudo-wire control word of the TDM emulation service, and controls on and off of the pseudo-wire control word processing, and may be implemented by software or hardware. The specific implementation functions at least comprise:
(1) and the client side sets the L bit set after detecting that the signal is invalid, and cancels the L bit set after detecting that the client signal is recovered.
(2) When the L bit of the received pseudo wire message is detected to be set at the network side, the client signal at the far end is considered to be invalid, and an alarm needs to be inserted into the client side at the local end.
(3) When the data on the network side is interrupted, an alarm needs to be inserted into the client side of the TDM emulation service.
The protection control unit 32 is responsible for maintaining the protection state of the protection group of the multiplex section and executing the protection action.
The control word processing enabling control unit 33 is configured to control a control word processing enabling state of a certain TDM emulation service, that is, to determine whether a control word processing function is enabled for the certain TDM emulation service.
The specific implementation method comprises the following steps: the control word processing enabling control unit 31 obtains the current multiplexing section protection group state, decides which TDM emulation service control word processing should be enabled according to the current multiplexing section protection group state, configures the enabling state of the corresponding TDM emulation service into the control word processing unit 32, and finally encapsulates the final service pseudo-wire message or processes the received service pseudo-wire message according to the rule by the emulation service processing unit 33.
Fig. 4 is a control flowchart for increasing the switching frequency of the multiplexing section in the packet transport network according to the embodiment of the present invention, and as shown in fig. 4, the specific steps are as follows:
step S401: multiplex Section Protection (MSP) is configured.
Step S402: the non-working port control word processing is set to disable. Processing the control word of the port in the non-working state to enable according to the current main/standby state of the multiplex section protection group;
step S403: the working port control word processing is set to enable. And processing and enabling the service control word on the port in the working state according to the current main/standby state of the multiplex section protection group.
Step S404: and (4) finishing.
Step S402 and step S403 are performed synchronously.
Fig. 5 is an operation flowchart for increasing the switching frequency of the multiplex section in the packet transport network according to the embodiment of the present invention, and as shown in fig. 5, specific operations of the PTN terminal when the configuration protection group is polled by the timer are as follows:
step S501: and (5) timing the message. A timer is implemented, the timing period can be configured, the typical configuration is 100ms, and the timer can be implemented by hardware or software.
Step S502: and inquiring the state of the multiplex section protection group. That is, the timer polls the protection status of the protection group of multiplexed segments.
Step S503: and judging the current state change. After the timer expires, a change in the state of the protection group of the multiplex section is detected, and the process proceeds to step S504, where no change occurs, and the process proceeds to step S506.
Step S504: and setting the non-working port control word processing to disable and clear the alarm. The working port is switched to a non-working port, de-enabling control word processing is performed, and the alarm set to the client side according to the value of the control word is cleared.
Step S505: delaying the preset time and setting the processing enable of the working port control word. The non-working port is switched to the working port, and the time is delayed for a period of time, wherein the typical time can be 2-3 seconds, so that the control word processing is enabled.
Step S506: and (4) finishing.
At present, a device for increasing the switching frequency of the multiplex section in the packet transport network is applied to a large-scale PTN device, and the control word processing unit is implemented by software, so that the circuit simulation service of E1 is realized. The single board for implementing the control word processing unit can only implement control word processing enabling by software because the alarm detection and pseudo wire encapsulation of the client side are respectively implemented in different chips, thereby effectively reducing the multiplex section protection switching time of the E1 emulation service. The specific functions are as follows:
(1) the client side sets the L bit set after detecting that an Alarm Indication Signal (AIS) is generated, and cancels the L bit set after detecting that the AIS disappears.
(2) And if the E1 framing format is adopted, when the pseudo wire message received by the network side detects that the L bit is set, inserting the E1-AIS into the client side.
The specific implementation steps are as follows:
(1) configuring a multiplex section protection group on a single board, and controlling all E1 simulation services on a working state port by software according to the state of the protection group without controlling all E1 simulation services on a non-working state port.
(2) An absolute timer with a period of 100ms is started.
(3) And after the timer is overtime, inquiring the state of the multiplex section protection group, and carrying out no treatment when the state is unchanged.
(4) After detecting the state change of the multiplex section protection group, the following operations are executed:
for the non-working port to be switched into the working port, after delaying for 3 seconds, the software starts to process control words for all services on the working port;
when the working port is switched to a non-working port, software immediately clears the warning that all services on the non-working port are inserted due to the protection of the abnormal control word and immediately stops processing the control word.
At present, a device for increasing the switching frequency of the multiplex section in the Packet transport network has been applied to a large-scale PTN device, wherein a control word processing unit is implemented by hardware, and the service type is a Circuit Emulation over Packet (CEP) service in a Packet-switched network of a standard virtual container VC 4. The client side alarm detection of the single board for realizing the control word processing unit and the packaging of the pseudo wire message are all completed in one chip, so that the hardware can complete the operation of all the control words, and compared with software, an enabling control interface is provided, thereby effectively reducing the multiplex section switching time of the CEP simulation service. The specific functions are as follows:
(1) and the client side sets the L bit set after detecting that the MS-AIS is generated and cancels the L bit set after detecting that the MS-AIS disappears.
(2) And when the pseudo wire message received by the network side detects the L bit set, the MS-AIS is inserted into the client side.
The specific implementation steps are as follows:
(1) configuring a multiplex section protection group on a single board, setting all CEP simulation service control word processing enabling on a working state port by software according to the state of the protection group, and setting all CEP simulation service control word processing disabling on a non-working state port.
(2) An absolute timer with a period of 100ms is started.
(3) After the timer is overtime, the state of the multiplex section protection group is inquired, and no change is made and no processing is carried out
(4) After the state change of the multiplex section protection group is detected, the following operations are carried out:
for the non-working port to be switched into the working port, after delaying for 3 seconds, software sets the control word processing enabling of all services on the working port;
and for the working port to be switched into the non-working port, the software informs hardware to clear the protection down-insertion alarm due to the received control word abnormity, and sets the control word processing of all services under the non-working port to enable.
In summary, the present invention has the following technical effects: by providing a method for improving the switching efficiency of the multiplex section protection, in the process of changing the working port into the non-working port in the switching process, some unnecessary control word operations do not need to be processed, and the time for interrupting the TDM service of the multiplex section protection switching can be effectively reduced. In addition, under the condition of normal operation, only the related operation of the service processing control word in the working state is needed, which is reduced by half compared with the prior art, and the software burden can be reduced when the service configuration amount is larger for the environment of processing the control word by software.
Although the present invention has been described in detail hereinabove, the present invention is not limited thereto, and various modifications can be made by those skilled in the art in light of the principle of the present invention. Thus, modifications made in accordance with the principles of the present invention should be understood to fall within the scope of the present invention.

Claims (10)

1. A method for improving switching efficiency of a multiplex section protection group in a packet transport network is characterized by comprising the following steps:
acquiring the protection state of a multiplex section protection group;
enabling the pseudo wire control word processing of the time division multiplexing emulation service on the working port in the working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group, and
and processing and disabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port in the non-working state in the multiplexing section protection group according to the acquired protection state of the multiplexing section protection group.
2. The method of claim 1, further comprising:
after the pseudo wire control word processing of the time division multiplexing simulation service is subjected to the enabling and disabling processing, polling the current states of a working port in a working state and a non-working port in a non-working state in a multiplexing section protection group;
and if the current state of the working port or the non-working port is found to be changed through polling, changing the pseudo wire control word processing of the time division multiplexing simulation service.
3. The method of claim 2, further comprising: and if the current state of the working port or the non-working port is not changed through polling, maintaining the pseudo wire control word processing of the time division multiplexing simulation service.
4. The method according to claim 2, wherein the step of polling the current status of the working ports and the non-working ports in the working state in the protection group of the multiplex section comprises:
presetting a timer, and polling the current states of the working port in the working state and the non-working port in the non-working state in the multiplex section protection group according to the configured timing period.
5. The method of claim 2, wherein the step of changing pseudowire control word processing for time division multiplexing emulation services if the current status of the working port or non-working port is found to have changed by polling comprises:
if the working port is switched from the working state to the non-working state, processing the pseudo wire control word of the time division multiplexing simulation service on the working port switched to the non-working state to enable the pseudo wire control word;
and if the non-working port is switched from the non-working state to the working state, processing and enabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port switched to the working state after delaying preset time.
6. The method of claim 5, wherein the step of disabling pseudowire control word processing for time division multiplexing emulation services on the working port switched to the inactive state further comprises:
and if the L bit setting in the time division multiplexing simulation service pseudo-line message on the working port switched to the non-working state is detected, eliminating the alarm set to the client side according to the L bit setting.
7. An apparatus for improving switching efficiency of a protection group of a multiplex section in a packet transport network, comprising:
the acquisition module is used for acquiring the protection state of the multiplex section protection group;
an enabling module, configured to enable, according to the obtained protection state of the protection group in the multiplexing segment, processing of a pseudo-wire control word of a time division multiplexing emulation service on a working port in a working state in the protection group in the multiplexing segment, and
and the de-enabling module is used for processing and de-enabling the pseudo wire control word of the time division multiplexing simulation service on the non-working port in the non-working state in the multiplexing section protection group according to the obtained protection state of the multiplexing section protection group.
8. The apparatus of claim 7, further comprising:
the polling module is used for polling the current states of the working port in the working state and the non-working port in the non-working state in the multiplex section protection group after the enabling and the disabling of the pseudo wire control word processing of the time division multiplex emulation service;
and the changing module is used for changing the pseudowire control word processing of the time division multiplexing simulation service if the current state of the working port or the non-working port is found to be changed through polling.
9. The apparatus of claim 8, wherein the changing module further comprises:
the first switching submodule is used for processing and disabling the pseudo wire control word of the time division multiplexing simulation service on the working port switched to the non-working state if the working port is switched to the non-working state from the working state;
and the second switching submodule is used for enabling the processing of the pseudo wire control word of the time division multiplexing simulation service on the non-working port switched to the working state after delaying preset time if the non-working port is switched to the working state from the non-working state.
10. The apparatus of claim 9, wherein the first switching sub-module further comprises:
and the clearing unit is used for eliminating the alarm set to the client side according to the L bit set if the L bit set in the time division multiplexing simulation service pseudo-line message on the working port switched to the non-working state is detected.
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PCT/CN2015/090173 WO2016145812A1 (en) 2015-03-18 2015-09-21 Method and apparatus for improving rearranging efficiency of multiplexing segments in packet transport network

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