CN101547131B - EAPS looped network single-channel fault location and protection method - Google Patents
EAPS looped network single-channel fault location and protection method Download PDFInfo
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- CN101547131B CN101547131B CN2009103023593A CN200910302359A CN101547131B CN 101547131 B CN101547131 B CN 101547131B CN 2009103023593 A CN2009103023593 A CN 2009103023593A CN 200910302359 A CN200910302359 A CN 200910302359A CN 101547131 B CN101547131 B CN 101547131B
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Abstract
The invention relates to an ethernet network looped network technology, particularly an EAPS protocol. The invention discloses a method for locating and protecting the single-channel fault of the EAPS loop, which comprises the following steps: A. a master node is set as a loop checking message uploading control plane and a transmission node is set as a loop checking message uploading control plane and transfers; B. the master node transfers the loop checking message from two EAPS ports within period T; C. the transmission node is judged whether it is in the single-channel state based on the receiving loop checking message state of two EAPS ports of the transmission node. The invention is applied to EAPS looped network, solves the problems of the EAPS looped network single-channel fault location and protection and improves the looped network reliability constructed based on EAPS protocol.
Description
Technical field
The present invention relates to the Ethernet ring network technology, particularly EAPS (Ethernet AutomaticProtection Switching; Its standard is seen " RFC3619 ") agreement.
Background technology
In the traditional E APS looped network technology, the EAPS ring is made of a host node (Master) and some transmission nodes (Transit), and they have 2 EAPS ports separately, are called master port P and secondary port S, and its typical structure as shown in Figure 1.In the EAPS loop detection, conventional method is: host node sends loop detection message from master port P, and loop detection message is propagated on ring through each transmission node on the EAPS ring.If host node can be received the detection messages that oneself is sent out at secondary port S, illustrate that loop network link is complete.Otherwise if can not receive detection messages at the appointed time, then thinking needs the open auxiliary port by loop fault, allows it to transmit data.Can detect the line fault of loop intermediate ring road detection messages direction like this.But, if the line direction opposite with loop detection message is out of order, then can not detect, rightabout data can not be protected.If the direction of loop detection message is out of order, and loop detection message is not out of order in the other direction, and then host node meeting open auxiliary port S causes loop detection message loop to occur to opposite direction like this.The Chinese patent that name is called " a kind of method of protecting ring network link, system and equipment " (application number 200710000988.1) can detect the fault of circuit both direction.Host node all sends loop detection message at master port P and secondary port S simultaneously, master port P and secondary port S receive loop detection message, if two ports all do not receive loop detection message at the appointed time, can think that then fault has appearred in circuit, host node open auxiliary port S allows data forwarding.If single-pass occurs, then host node can also be received the loop fault detection messages from a port, thinks that still circuit is no problem, does not handle single-channel fault.
Summary of the invention
The technical issues that need to address of the present invention position with regard to providing a kind of single-channel fault at the EAPS loop, and the method that single-channel fault is protected.
The technical scheme that the present invention solve the technical problem employing is that EAPS looped network single-channel fault location and guard method may further comprise the steps:
A, host node are set to loop detection message and submit control plane, submit control plane and forwarding and transmission node is set to loop detection message;
B, host node send loop detection message from two EAPS ports respectively with period T;
An EAPS port of C1, and if only if certain transmission node does not receive loop detection message at the appointed time, forwards the loop detection message wait state to;
C2, described transmission node send the identical cycle of loop detection message from another port transmission loop detection message with host node, if can receive loop detection message from the port that can not receive loop detection message just now again at the appointed time, then forward normal condition to, stop the transmission of this port loop detection message;
C3, if never receive loop detection message at the appointed time, think that then the port that does not receive loop detection message is the single-pass port, described transmission node is changed to the single-pass state, blocks the single-pass port.
Further, also comprise step:
D, be in the transmission node of single-pass state,, then forward interim blocked state to, finish the transmission of loop detection message if receive loop detection message from the single-pass port; Be in the transmission node of single-channel fault state,, then forward malfunction to, remove obstruction the single-pass port if normal port physical signalling is lost;
Further, the described stipulated time is at least 3T.
The invention has the beneficial effects as follows, solved the problem of EAPS loop single-channel fault location and protection, improved the reliability of the looped network of setting up based on the EAPS agreement.
Description of drawings
Fig. 1 ESPA ring network structure schematic diagram.
Embodiment
On the EAPS ring, it is that loop detection message is submitted control plane that host node is set, and the loop detection message of each transmission node is submitted control plane and forwarding.
As Fig. 1, host node sends loop detection message from master port P and secondary port S with period T respectively.As long as host node is if receive the LINK-DOWN message or have a port not receive the loop detection message that oneself sends in the stipulated time of regulation, then open auxiliary port S allows data forwarding, and host node switches to malfunction to state.Host node if all receive the loop detection message that oneself sends from two ports, then switches to good working condition when being in malfunction, block secondary port.
In the existing EAPS technology, transmission node has four kinds of states: initial condition, malfunction, interim blocked state and normal condition.In order to locate single-channel fault, the present invention increases two states again: loop detection message wait state and single-channel fault state.
The EAPS loop is under complete situation, and the master port P of each transmission node and secondary port S can both receive the loop detection message that host node sends on the ring.
Lose if transmission node 3 detects the physical signalling of master port P, then send the LINK-DOWN message to host node, and send loop detection message from port S with period T from secondary port S.The purpose of doing like this is that the master port P for other transmission node that makes transmission node 3 right sides can receive loop detection message.The difference of the loop detection message that the loop detection message that transmission node sends and host node send is that the source MAC in the ether header fields of message is different.After the physical signalling of the master port P of transmission node 3 recovers, stop to send loop detection message from secondary port S.
If among the master port P and secondary port S of transmission node 3, physical signalling is not lost, and and if only if when master port P do not receive loop detection message, is changed to the loop detection message wait state, and the regulation stand-by period is T1.And send loop detection message from master port P and secondary port S respectively with period T.The purpose of doing so also is that the secondary port S for other transmission node that makes transmission node 3 left sides can receive loop detection message, and the master port P of transmission node 3 other transmission nodes of right side can receive loop detection message.Be dropped in transmission course in order to prevent message, general recommendations regulation stand-by period T1 is set to 3T at least, promptly has at least continuous 3 loop detection messages not receive, just loop is considered to be out of order.
The transmission node 3 that is in the loop detection message wait state if can receive loop detection message, then forwards normal condition to, and stops to send loop detection message in stand-by period T1.If can not receive loop detection message, then forward the single-channel fault state to, block single-pass port (being master port P), send the LINK-D0WN message from normal port (being secondary port S) to host node.
Be in the transmission node 3 of single-channel fault state,, then forward interim blocked state to, stop the transmission of loop detection message if receive loop detection message from the single-pass port.
Be in the transmission node 3 of single-channel fault state,, then forward malfunction to, remove obstruction the single-pass port if normal port physical signalling is lost.
Claims (3)
1.EAPS looped network single-channel fault location and guard method may further comprise the steps:
A, host node are set to loop detection message and submit control plane, submit control plane and forwarding and transmission node is set to loop detection message;
B, host node send loop detection message from two EAPS ports respectively with period T;
An EAPS port of C1, and if only if certain transmission node does not receive loop detection message at the appointed time, forwards the loop detection message wait state to;
C2, described transmission node send the identical period T of loop detection message with host node and send loop detection message from another port, if can receive loop detection message from the port that can not receive loop detection message just now again at the appointed time, then forward normal condition to, stop the transmission of this port loop detection message;
C3, if never receive loop detection message at the appointed time, think that then the port that does not receive loop detection message is the single-pass port, described transmission node is changed to the single-pass state, blocks the single-pass port.
2. EAPS looped network single-channel fault according to claim 1 location and guard method is characterized in that, also comprise step:
D, be in the transmission node of single-pass state,, then forward interim blocked state to, finish the transmission of loop detection message if receive loop detection message from the single-pass port; Be in the transmission node of single-channel fault state,, then forward malfunction to, remove obstruction the single-pass port if normal port physical signalling is lost.
3. EAPS looped network single-channel fault according to claim 1 and 2 location and guard method is characterized in that the described stipulated time is at least 3T.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009103023593A CN101547131B (en) | 2009-05-15 | 2009-05-15 | EAPS looped network single-channel fault location and protection method |
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| CN2009103023593A CN101547131B (en) | 2009-05-15 | 2009-05-15 | EAPS looped network single-channel fault location and protection method |
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| CN101547131B true CN101547131B (en) | 2011-04-13 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101989934B (en) * | 2009-08-06 | 2017-04-05 | 中兴通讯股份有限公司 | A kind of data ring network fault detect and the method and system of positioning |
| CN102291290A (en) * | 2011-08-08 | 2011-12-21 | 浙江中控技术股份有限公司 | Method and system for failure detection and connection of Ethernet ring network |
| CN103200172B (en) | 2013-02-19 | 2018-06-26 | 中兴通讯股份有限公司 | A kind of method and system of 802.1X accesses session keepalive |
| CN105577484A (en) * | 2016-03-01 | 2016-05-11 | 上海斐讯数据通信技术有限公司 | EAPS failure detection method and system, and EAPS network |
| CN113542056A (en) * | 2021-06-18 | 2021-10-22 | 新华三技术有限公司 | Fault detection method, forwarding device and storage medium |
| CN114500161A (en) * | 2022-02-27 | 2022-05-13 | 重庆长安汽车股份有限公司 | Redundant link switching method based on vehicle-mounted Ethernet ring network and readable storage medium |
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