WO2005060158A1 - Method used to report a malfunction in a communication network - Google Patents
Method used to report a malfunction in a communication network Download PDFInfo
- Publication number
- WO2005060158A1 WO2005060158A1 PCT/EP2004/013900 EP2004013900W WO2005060158A1 WO 2005060158 A1 WO2005060158 A1 WO 2005060158A1 EP 2004013900 W EP2004013900 W EP 2004013900W WO 2005060158 A1 WO2005060158 A1 WO 2005060158A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- network node
- network
- fault
- fault message
- network nodes
- Prior art date
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Classifications
-
- 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
- H04L41/06—Management of faults, events, alarms or notifications
Definitions
- the invention relates to a method for reporting a malfunction of a disturbed network node in a communication network comprising several network nodes, and a network node for carrying out the method according to the invention.
- network elements in particular network nodes, can be configured such that they automatically generate a corresponding fault message in the event of a malfunction and transmit them to a higher-level network management station, where the fault is registered and further measures are derived.
- routing tables can be adapted to the changed situation so that no data traffic is routed over disturbed network elements. The fault message is sent unsecured over the possibly disturbed communication network. Therefore, it cannot be guaranteed that the fault message will actually reach the intended network management stations.
- the second option for error or failure detection is the periodic polling of all network nodes by one or more network management stations. This method is also known as "polling".
- the disadvantage of this method is that the network management stations and the communication network itself are comparatively heavily burdened by these ongoing queries.
- Another disadvantage is that failure is identified by the lack of an answer to a question. The lack of a response can also be due to the fact that connection paths to a network node and not the network node itself are disturbed. As long as the routing tables in the communication network are not adapted accordingly, false failure messages can occur.
- the invention is therefore based on the object of specifying a method in which a fault message reliably reaches all network nodes of a communication network.
- each operational network node reports a malfunction report of the disturbed network node to all network nodes which are directly adjacent to the operational network node, unless an interference avoidance has been received which has already been reported.
- the method according to the invention is strongly based on the Dijkstra shortest path algorithm. This algorithm is used to find the shortest connection between a start node and a destination node, for example for route planners. The entire network formed by nodes is searched and the shortest route is guaranteed to be found.
- a faulty network node sends a fault message to all network nodes directly adjacent to it.
- a fault message which is generated on the basis of a fault which the network node itself has detected is not sent directly to a network management station, but rather to all network nodes which are adjacent to the faulty network node and which in turn forward it. In this way, the network management station is relieved, among other things.
- an operational network node continuously sends a message to be acknowledged to all network nodes directly adjacent to it, if this operational network node generates a malfunction report for a network node from which no acknowledgment has been received and if this operational network node sends this malfunction report to all network nodes directly adjacent to it.
- the error detection and error message is shifted to the network nodes adjacent to a faulty network node.
- Each network node is continuously queried by its neighboring network nodes with regard to its operational readiness. If this request is not acknowledged due to a fault, the querying network nodes assume a fault.
- This method is also known as "polling".
- polling is carried out by a higher-level network management station, each network node is responsible for its neighbors. Error detection and avoidance are decentralized.
- An operational malfunction can advantageously be classified in such a way that the malfunction report affects the disturbed network node itself if all neighboring network nodes detect a malfunction and - that the malfunction report relates to the connection to the disturbed network node if not all neighboring network nodes determine a malfunction.
- connection of a network node to all of its neighboring network nodes fails, it can be assumed with a high degree of probability that the network node itself is disturbed, or the difference to the possibility that the network node works correctly, however all connections are down, irrelevant for routing. Under no circumstances should attempts be made to route data traffic via this network node. However, if not all neighboring network nodes detect a fault, only one or more connections to the network node have failed, but the network node itself is ready for operation. For this reason, data traffic can still be conducted via this network node; only the failed connections have to be taken into account.
- a favorable variant of the invention is also provided with a method in which a network node that performs higher-level functions derives further steps from the receipt of a fault message.
- a fault message reaches all network nodes of a communication network and thus also network nodes that are intended for higher-level functions.
- the latter can derive further measures from receiving a fault report.
- global routing tables can be adapted to the changed situation so that no attempt is made to route data traffic over faulty network components.
- the object of the invention is also achieved with a network node, comprising means for receiving a fault message from a faulty network node, means for forwarding this fault message to all network nodes which are directly adjacent to it, - means for checking whether this fault message has already been reported and a transmission control which is carried out with the Means for testing is linked in such a way that the retransmission of a sto message is only generated if the test is negative.
- a network node according to the invention can therefore be constructed in a technically comparatively simple manner.
- the network node comprises means for detecting a fault and includes means for sending a fault message to all network nodes directly adjacent to it.
- a fault message is not sent directly to a network management station, but is instead forwarded to all the network nodes adjacent to the faulty network node. Due to the interaction of the network nodes, a fault message safely reaches every point in the communication network.
- the network node comprises means for continuously sending a message to be acknowledged to all network nodes directly adjacent to it, if the network node comprises means for generating a fault message for a network node from which no acknowledgment has been received and if the network node comprises means for sending this fault message to all network nodes directly adjacent to it.
- This type of network node is suitable for monitoring all of its neighbors. It is therefore not a specially designed network management station that carries out the polling, but decentralized each network node.
- a particularly advantageous variant of the network node according to the invention is also given if it comprises means for checking whether all network nodes adjacent to a faulty network node detect a fault and - if this comprises means for characterizing a fault message in such a way that the fault message relates to the faulty network node itself, if the result of the test is positive, and otherwise the fault message relates to the connection to the faulty network node.
- the network node comprises means for performing higher-level functions and if the network node comprises means for deriving further steps from the receipt of a fault message.
- Higher-level functions can also be integrated in a network node. For example, global routing tables can be changed accordingly if a fault message is received.
- Network nodes designed in this way are, for example, the network management stations already mentioned.
- Figure 1 shows a communication network with a first to ninth network node K1..K9;
- Figure 2 shows the communication network with a disturbed first network node Kl at a first time tl;
- Figure 3 like Figure 2 only at a second time t2;
- Figure 4 like Figure 2 only at a third time t3;
- FIG. 5 shows a communication network with "polling", wherein a connection between two network nodes is disturbed
- FIG. 6 as in FIG. 5 only with a disturbed first network node K1;
- Figure 1 shows communication network comprising a first to ninth network node K1..K9, the first network node Kl with the second to fifth network node K2..K5, the second network node additionally with the sixth and seventh network node K6 and Kl, the third network node additionally with the eighth and ninth network node K8 and K9 and finally the sixth network node with the fifth and seventh network node K5 and K7 is connected.
- Figure 2 shows the communication network at a first time tl. Assuming that a fault is detected in the first network node K1, a corresponding fault message is sent to the directly adjacent network nodes, that is to say to the second to fifth network nodes K2..K5. The
- the fault is indicated by a lightning symbol, and the transmission of the fault message is visualized by arrow symbols.
- the sixth to ninth network nodes K6 to K9 have not yet received the fault message and are therefore shown in broken lines.
- FIG. 3 shows the communication network at a second time t2.
- the fault message is forwarded from each network node to the network nodes directly adjacent to it.
- all network nodes K2 .. K9 have received the fault message and are therefore shown with solid lines.
- the first network node Kl receives this Process also fault reports from the neighboring network nodes K2..K5, which he considers his own fault report as acknowledgments.
- Figure 4 shows the communication network to a third
- the fault message is sent from the sixth network node K6 to the second, fifth and seventh network nodes K2, K5 and K7, from the seventh network node K7 to the second and sixth network nodes K2 and K6, from the eighth network node K8 to the third network node K3 and finally also sent from the ninth network node K9 to the third network node K3.
- the second, third and fifth network nodes K2, K3 and K5 in turn regard the feedback as acknowledgments of the own fault avoidance.
- the process of reporting the malfunction has been completed at this point, since each network node has forwarded the fault message to all neighboring network nodes, unless it has already received the fault message at an earlier point in time. Therefore, for example, the seventh network node K7 becomes the sixth
- Fault message received network node K ⁇ is no longer forwarded, since this was already received by the second network node K2 at time t2.
- FIG. 5 shows a communication network in which each network node K1..K9 continuously sends messages to all neighboring network nodes, which confirm these if they are ready for operation. In the event of a malfunction, of course, this feedback fails.
- the method which is also known under the term “polling”, is of advantage, for example, when a network node is no longer able, for example as a result of a total failure, to issue a fault message, as shown in FIG. This "pollen” is visualized by corresponding arrows. It is now assumed that the connection between the first and second network nodes K1 and K2 is disturbed. This is again illustrated with a lightning symbol. The second network node K2 therefore receives no feedback from the first
- Network node Kl By communication with other network nodes K3... K5 adjacent to the first network node Kl, it can subsequently be established that these have a perfect connection to the first network node Kl. From this it can now be deduced that not the first network node Kl itself, but only the connection between the first and second network nodes Kl and K2 is disturbed. The method steps mentioned can also be carried out in an analogous manner by the first network node with regard to the faulty connection.
- FIG. 6 also shows a communication network in which the operational readiness of the network nodes K1..K9 is monitored using "polling". In contrast to FIG. 5, however, none of the network nodes K2... K5 adjacent to the disturbed first network node K1 receives any feedback from it. From this it can now be deduced that this is a total failure of the first network node K1.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04816303A EP1695484A1 (en) | 2003-12-17 | 2004-12-07 | Method used to report a malfunction in a communication network |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10359290.3 | 2003-12-17 | ||
DE2003159290 DE10359290A1 (en) | 2003-12-17 | 2003-12-17 | Method for reporting a malfunction in a communications network |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005060158A1 true WO2005060158A1 (en) | 2005-06-30 |
Family
ID=34683472
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2004/013900 WO2005060158A1 (en) | 2003-12-17 | 2004-12-07 | Method used to report a malfunction in a communication network |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1695484A1 (en) |
DE (1) | DE10359290A1 (en) |
WO (1) | WO2005060158A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5949759A (en) * | 1995-12-20 | 1999-09-07 | International Business Machines Corporation | Fault correlation system and method in packet switching networks |
EP0959641A1 (en) * | 1998-05-19 | 1999-11-24 | Alcatel | Method for protection of ATM connections in a telecommunication network |
EP0993145A1 (en) * | 1998-10-08 | 2000-04-12 | International Business Machines Corporation | System for broadcasting alarm messages to selected users of an IP network |
-
2003
- 2003-12-17 DE DE2003159290 patent/DE10359290A1/en not_active Withdrawn
-
2004
- 2004-12-07 WO PCT/EP2004/013900 patent/WO2005060158A1/en not_active Application Discontinuation
- 2004-12-07 EP EP04816303A patent/EP1695484A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5949759A (en) * | 1995-12-20 | 1999-09-07 | International Business Machines Corporation | Fault correlation system and method in packet switching networks |
EP0959641A1 (en) * | 1998-05-19 | 1999-11-24 | Alcatel | Method for protection of ATM connections in a telecommunication network |
EP0993145A1 (en) * | 1998-10-08 | 2000-04-12 | International Business Machines Corporation | System for broadcasting alarm messages to selected users of an IP network |
Also Published As
Publication number | Publication date |
---|---|
DE10359290A1 (en) | 2005-07-21 |
EP1695484A1 (en) | 2006-08-30 |
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