JP2006014151A - Network management apparatus and network management program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the use efficiency of a link using link aggregation.
A network management apparatus 101 accesses routers 211 to 214 via a network interface unit 111, collects IF information, IP address, subnet mask, routing protocol IF cost information of each router 211 to 214, The link and the link information are stored in the database 115, and the special link corresponding unit 112 applies the link aggregation based on the association between the logical interface and the physical interface determined from the If Stack Status value. And the information of the interface constituting the special link and the special link information are stored in the database 115.
[Selection] Figure 1

Description

  The present invention relates to a network management apparatus and a network management program, and is particularly suitable for being applied to a configuration management method for a lower layer of a logical connection link by IP (Internet Protocol).

In the conventional IP network management method, as disclosed in Non-Patent Document 1, the network topology is grasped by acquiring the IP address and subnet mask value assigned to the interface of the node (router) from the node. There is a way.
Further, as disclosed in Non-Patent Documents 1 and 2, by grasping the network topology and acquiring routing cost information such as OSPF (Open Shortest Path First) attached to the IP address of the interface There is a method for specifying a route between any two points on the network.

Furthermore, as disclosed in Non-Patent Document 3, by collecting speed information of an interface, a method for specifying the maximum usable bandwidth of a path between two points, or two points compared to an actual traffic flow rate. There is a method of estimating the free bandwidth of the route between.
On the other hand, as a technique for configuring an IP network, link aggregation capable of handling a plurality of physical links as a single virtual link has been standardized as IEEE 802.3ad. In this link aggregation, the bandwidth can be increased without using a high-speed interface. For example, Non-Patent Document 4 discloses a method of bundling three links having a bandwidth of 1 Gbps and treating them as a logical link having a bandwidth of 3 Gbps.

Non-Patent Document 5 discloses a method of automatically or manually detecting link-aggregated links, treating physical links as logical links on the system, and managing them in the same manner as other links.
By Philips Mirror, directed by Yukio Hamada, “Mastering TCP / IP Application”, 1st edition, pp. 235-237, issued May 30, 2000 “Solution Introduction: Route Explorer”, Toyo Technica, [online], search on April 15, 2004, Internet, <http: // www. toyo. co. jp / packetdesign / r_solution. available from html> Yuguchi Yaguchi and three others, "A proposal and specific example of a resource management method using a management server in a large-scale IP network", IEICE, 2002 General Conference Proceedings, B-6-31, [CD- ROM], issued March 7, 2002 Published by Nikkei BP, "Communications Network Encyclopedia 03-04 edition", pp. 230, 1st edition, 1st edition, issued March 31, 2003 “3.5 Operation of Network Manager”, Hewlett-Packard Company, [online], April 15, 2004 search, Internet, <http: // docs. hp. com / ia / B3936-90066 / ch03s05. available from html>

However, in the conventional IP network management method, bandwidth information of all links is extracted and managed in a path connecting any two points including links using link aggregation, or resource management is performed. That was not done.
Also, when one physical link that constitutes a link using link aggregation fails or recovers from a failure, the failure and recovery of that one physical link is detected and the bandwidth of the logical link is updated. It wasn't.

For this reason, if some of the physical links that make up a link-aggregated link fail, the entire link that uses link aggregation becomes unusable, or the maximum available bandwidth of the link that uses link aggregation is well understood. There is a problem that the use efficiency of the link using link aggregation deteriorates.
Accordingly, an object of the present invention is to provide a network management apparatus and a network management program capable of improving link utilization efficiency using link aggregation.

In order to solve the above-described problem, according to the network management device of claim 1, a link aggregation detection unit that detects a link to which link aggregation is applied, and a link to which the link aggregation is applied are configured. Interface information management means for individually managing interface information is provided.
This makes it possible to understand the status of each link-aggregated link while maintaining link aggregation, and manages logical link information following the failure and recovery of the physical links that make up the link aggregation. Is possible. For this reason, it is possible to correctly specify the route between any two points, and it is possible to accurately grasp the maximum available bandwidth at the present time of the link using link aggregation, and link aggregation is used. Link utilization efficiency can be improved. Also, even if a failure occurs somewhere in the physical link that constitutes the link aggregation, if another link can be used, the operation as a whole logical link can be continued, and the fault tolerance can be improved.

  In the network management device according to claim 2, the interface information management means is configured such that an element table for registering attributes of elements accommodating each interface, and the type, speed, and link aggregation of each interface are mutually applied. And an IF table for registering pointers to other interfaces, and a link information table for registering pointers to the types and bandwidths of the respective links and the corresponding interfaces.

  As a result, even in a network including a link in which the correspondence between the connection link in the IP layer and the connection link in the lower layer is 1: N (N is an integer equal to or greater than 2), information regarding the link is set to 1: N. It is possible to manage on the database with the association. For this reason, logical links using link aggregation that provides multiple virtual links as a virtual high-speed interface are managed, and the physical links that make up the link aggregation follow the failure and recovery of the logical links. Bandwidth information can be managed.

  In addition, according to the network management device according to claim 3, whether or not the interface in which the failure is detected constitutes a link aggregation based on a failure detection unit that detects an interface failure and a reference result of the IF table. And a first updating unit for updating a total bandwidth of logical links constituting the link aggregation based on a determination result by the first determining unit.

  Thereby, even when one or more of the physical links constituting the link aggregation fail, the IF speed corresponding to the failure can be correctly subtracted from the total bandwidth of the logical links. For this reason, even if a failure occurs somewhere in the physical link constituting the link aggregation, it is possible to grasp the current total bandwidth, and it is possible to continue to correctly manage the logical link bandwidth.

  According to the network management device of claim 4, whether or not the recovery detection unit that detects recovery of the interface and the interface from which the recovery is detected constitutes a link aggregation based on the reference result of the IF table. And a second updating unit for updating the total bandwidth of the logical links constituting the link aggregation based on a determination result by the second determining unit.

  Thereby, even when one or more of the physical links constituting the link aggregation are recovered, the IF speed for recovery can be correctly added from the total bandwidth of the logical links. For this reason, even when any of the physical links constituting the link aggregation is restored, the current total bandwidth can be grasped, and the bandwidth of the logical link can be managed correctly.

  Further, according to the network management device of claim 5, based on link aggregation detection means for detecting a link to which link aggregation is applied, and a failure occurrence state of each physical link to which the link aggregation is applied. And bandwidth information calculating means for calculating bandwidth information of the entire logical link to which the link aggregation is applied.

  As a result, it is possible to manage the bandwidth information of the logical link while following the failure and recovery of the physical link constituting the link aggregation. For this reason, it becomes possible to grasp | ascertain accurately the maximum bandwidth currently available of the link using link aggregation, and the utilization efficiency of the link using link aggregation can be improved.

According to a sixth aspect of the network management apparatus of the present invention, the link aggregation detection means detects a logical link to which link aggregation is applied based on the relationship between the logical IF of each interface constituting the link and the corresponding physical IF. It is characterized by specifying.
As a result, by confirming the parent-child relationship between the interfaces, the logical link to which link aggregation is applied can be identified, and the logical link using link aggregation that provides a plurality of physical links as a virtual high-speed interface. Links can also be managed.

Further, according to the network management device of claim 7, the link aggregation detection unit applies the link aggregation based on the association between the logical interface and the physical interface determined from the If Stack Status value. It is characterized by specifying.
Thereby, it is possible to easily determine whether there is an interface associated with a plurality of interfaces, and it is possible to easily identify a link to which link aggregation is applied.

According to the network management program of claim 8, a step of detecting a link to which link aggregation is applied, and a step of individually managing information on an interface constituting the link to which the link aggregation is applied; Is executed by a computer.
This allows a computer to execute a network management program, so that it is possible to manage logical link information following the failure and recovery of the physical links that make up the link aggregation, and link utilization efficiency using link aggregation. Can be improved.

According to the network management program of claim 9, the step of detecting a link to which link aggregation is applied, and the occurrence status of a failure of each physical link to which the link aggregation is applied, And calculating the bandwidth information of the entire logical link to which the link aggregation is applied.
As a result, the network management program can be executed by the computer, so that it is possible to accurately grasp the currently available maximum bandwidth of the link using link aggregation, and the link utilization efficiency using link aggregation is improved. be able to.

  As described above, according to the present invention, it is possible to manage logical link information following the failure and recovery of the physical link that constitutes the link aggregation, and correctly specify the path between any two points. In addition, it is possible to improve the link utilization efficiency using link aggregation.

Hereinafter, a network management apparatus according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing a schematic configuration of a network management apparatus according to an embodiment of the present invention.
In FIG. 1, a network management apparatus 101 includes a network interface unit 111 for connecting to a network, a special link handling unit 112 that handles special link processing including link aggregation, and a path between any two points for a logical link. A route calculation unit 113 for calculating, a resource management unit 114 for managing network resources (maximum transfer capacity of a route), a database 115 for individually managing information of an interface constituting a link to which link aggregation is applied, and an external An external interface 116 is provided for connection.

  The network management apparatus 101 is connected to the human interface 102 and the external system 103 via the external interface 116. The network interface unit 111 is connected to routers 211 to 214, and the routers 211 to 214 can constitute nodes in the IP network. Here, each of the routers 211 to 214 can accommodate an interface constituting a link connection relationship.

  The network management apparatus 101 is connected to the IP network to be managed, and can collect the IP address, subnet mask value, and interface cost information of the interface accommodated in each of the routers 211 to 214. And by detecting the connection relation (link) of the interface based on these information, the network topology can be grasped and the shortest distance SP (Shortest Path) between any two points can be specified. Note that when collecting the interface IP address, subnet mask value, and interface cost information, means such as SNMP (Simple Network Management Protocol) or Telnet can be used. Further, when specifying the shortest distance SP between any two points, for example, the Dijkstra method can be used.

Further, the network management apparatus 101 can acquire bandwidth information of the interface from the If Speed information of the Interface Group of MIB (Management Information Base) -II or the configuration information of the routers 211 to 214.
In the following description, the case where the connection is limited to the connection using the IP address is limited to the connection using the L3 link, Ethernet (registered trademark), POS (Packet Over SONET), or the like, and the connection using the MAC (Media Access Control) address is L2. Called a link.

  The database 115 also includes an element table 121 that registers the attributes of elements that accommodate each interface, an IF table 122 that registers pointers to other interfaces to which the type, speed, and link aggregation of each interface are mutually applied, and A link information table 123 for registering each link type, bandwidth, and pointer to the corresponding interface is stored.

  Here, in the IF table 122, one table can be provided for each interface, and information on all interfaces can be stored regardless of physical interfaces or logical interfaces. At this time, each interface may have a unique ID, a flag indicating whether it is a physical interface or a logical interface, a pointer to a corresponding physical interface if it is a logical interface, and a pointer to a corresponding logical interface if it is a physical interface as attributes. it can. In the case of a logical interface, a plurality of logical interfaces may be further aggregated to form one logical interface. Therefore, a parent attribute indicating a configured interface and a child attribute indicating a configuration interface are prepared as attributes of the IF table 122. can do.

  In the link information table 123, the pointers of the interface and the counter interface are registered as attributes. Here, the interface pointed to is not a physical interface but an L3 link interface or an L3 link logical interface aggregated by link aggregation. Furthermore, the link information table 123 can have flag information attributes for identifying special links including link aggregation.

Then, the network management apparatus 101 can access all the routers 211 to 214 constituting the network and detect the interface that is link-aggregated. For example, by collecting the MIB If Stack Status values by SNMP connection, it is possible to detect the link-aggregated interface.
When a link-aggregated interface is detected, information about all the interfaces can be stored in the database 115 regardless of physical interfaces or logical interfaces.

  This makes it possible to understand the status of each link-aggregated link while maintaining link aggregation, and manages logical link information following the failure and recovery of the physical links that make up the link aggregation. Is possible. For this reason, it is possible to correctly identify the route between any two points, and to accurately grasp the current network resource (maximum transfer capacity of the route) of the link using link aggregation, It is possible to improve link utilization efficiency using link aggregation. Further, even if a failure occurs somewhere in the physical link constituting the link aggregation, if another link can be used, the operation as the entire logical link can be continued, and the fault tolerance can be improved.

In network services that use bandwidth information on an IP network, such as performing traffic control by subtracting the traffic flow and calculating the remaining bandwidth by grasping the maximum transfer capacity of the current route, link Even when a link to which aggregation is applied is used, the same service as a normal link can be provided.
In addition, the network management apparatus 101 can receive a Trap issued from the management target apparatus when an interface failure occurs, and can determine whether the failed interface is an interface constituting a link aggregation based on the Trap information. When the failed interface constitutes link aggregation, the bandwidth of the logical interface that is link-aggregated can be updated.

  That is, the IF failure Trap includes an ID (IfIndex value) that uniquely indicates the interface. Then, the network management apparatus 101 searches the L2 link IF table 122 using the ID as a key, and checks whether the failed interface is a link-aggregated interface from the output flag information attribute of the L2 link interface. can do. If the failed interface is a link-aggregated interface, the If Speed attribute of the interface is confirmed. Further, a logical link can be searched using a parent attribute indicating the configured interface as a key, and the If Speed value of the failed interface can be subtracted from the bandwidth attribute value of the logical link.

  As a result, the bandwidth of the logical interface can be updated after determining that the failed interface constitutes the link aggregation, and the trap is determined to be a link failure even though the remaining links are not failed. Can be prevented. Also, even when polling is performed on the transmission source of the trap, it is possible to prevent erroneous recognition that the remaining link returns a response, not a failure but an instantaneous interruption, and that the link is currently recovered. It is possible to correctly detect that the bandwidth of the link-aggregated logical link is reduced.

For this reason, even if a failure occurs somewhere in the physical link constituting the link aggregation, it is possible to correctly grasp the current total bandwidth, and to continue to correctly manage the logical link bandwidth.
Furthermore, the network management apparatus 101 can receive the Trap issued from the management target apparatus at the time of interface recovery, and can determine whether the recovered interface is an interface constituting a link aggregation based on the Trap information. When the recovered interface constitutes link aggregation, the bandwidth of the logical interface that is link-aggregated can be updated.

  That is, the IF failure recovery trap includes an ID (IfIndex value) that uniquely indicates the interface. Then, the network management apparatus 101 searches the L2 link IF table 122 using the ID as a key, and from the output flag information attribute of the interface of the L2 link, determines whether the interface that has recovered from failure is an interface that has been link-aggregated. Can be confirmed. If the interface that has recovered from the failure is an interface that has been link-aggregated, the If Speed attribute of the interface is confirmed. Further, the logical link is searched using the parent attribute indicating the configured interface as a key, and the If Speed value of the recovered interface can be added to the bandwidth attribute value of the logical link.

As a result, it is possible to update the bandwidth of the logical interface after determining that the recovered interface constitutes a link aggregation, and even when another L2 link interface is operating when receiving a trap, It is possible to prevent the trap from being ignored due to failure recovery for a link that does not exist.
For this reason, even when any of the physical links constituting the link aggregation is restored, it is possible to correctly grasp the current total bandwidth, and to continue to correctly manage the bandwidth of the logical link.

FIG. 2 is a sequence diagram showing the operation of the network management apparatus 101 of FIG.
In FIG. 2, the network management apparatus 101 accesses the routers 211 to 214 via the network interface unit 111 (K1). Note that when accessing the routers 211 to 214, a protocol such as SNMP can be used. Then, when accessing the routers 211 to 214, the network interface unit 111 collects IF information, IP addresses, subnet masks, and routing protocol IF cost information of the routers 211 to 214 (K2). When SNMP is used, various information on MIB-II can be collected.

When the network interface unit 111 collects interface information of each of the routers 211 to 214, the network interface unit 111 sends the interface information to the special link corresponding unit 112 (K3), and stores the interface information and link information in the database 115. (K4).
Here, in order to detect link aggregation, the network interface unit 111 can acquire the MIB value of the If Stack Status in the MIB-II if MIB from each of the routers 211 to 214.
When the special link corresponding unit 112 receives the interface information of each of the routers 211 to 214, the link to which the link aggregation is applied based on the association between the logical interface and the physical interface determined from the If Stack Status value. Can be specified.

FIG. 3 is a diagram illustrating an example of a link aggregation determination method according to an embodiment of the present invention.
In FIG. 3, it is assumed that five interfaces having IfIndex values of 26, 27, 28, 29, and 32 are detected. Then, the special link corresponding unit 112 searches the If Stack Status value using the IfIndex as a key, and confirms the parent-child relationship of each interface. In the example of FIG. 3, the parent-child relationship is confirmed between the interfaces 26 and 28, 27 and 29, 26 and 32, and 27 and 32.

  When the parent-child relationship between the interfaces is confirmed, a link to which link aggregation is applied is specified by determining whether there is an interface associated with a plurality of interfaces in these parent-child relationships. In the example of FIG. 3, it is determined that link aggregation is not applied because the pair of 26 and 28 and 27 and 29 has a one-to-one parent-child relationship and the IfSpeed value is 100000000. Can do. Further, since a pair of If Stack Status 28 and 0 is detected, it can be determined that 28 indicates an L2 link interface.

On the other hand, for the pair of 26 and 32 and 27 and 32, a plurality of interfaces 26 and 27 are associated with 32, and the IfSpeed value of 32 is the sum of the IfSpeed values of 26 and 27 = 200000000. Therefore, it can be determined that link aggregation is applied, and 32 can be determined as a logical link.
Then, when the special link corresponding unit 112 detects the special link including the link aggregation, the special link corresponding unit 112 stores the information of the interface constituting the special link and the special link information in the database 115 (K5).

  Here, the element table 121, IF table 122, and link information table 123 can be stored in the database 115. A unique ID is assigned to all the interfaces of the routers 211 to 214 detected by SNMP or Telnet, and data for one interface is stored in one table. Also, the IfIndex value obtained by SNMP, the IDs of the routers 211 to 214 that accommodate the interface, the IP address and subnet mask value of the interface, the interface type (L2 link, K3 link, or special link such as link aggregation), correspondence relationship The unique ID of the other parent or child interface can be stored in the database 115 as an attribute.

4A is a diagram showing a configuration example of the element table 121 in FIG. 1, FIG. 4B is a diagram showing a configuration example of the IF table 122 in FIG. 1, and FIG. 4C is a diagram in FIG. It is a figure which shows the structural example of the link information table.
In FIG. 4A, the element table 121 includes an Element_ID for identifying elements such as routers 211 to 214, a Status indicating the state of the element, a Type indicating the type of the element, an Equipment Type indicating the model type, and an L2 link. L2IF_ID for identifying the interface of L3, L3IF_ID for identifying the interface of the L3 link, Supported Element_ID for identifying the parent element, and Supporting Element_ID for identifying the child element are registered.

  In FIG. 4B, the IF table 12 includes an IF_ID for identifying an interface, a status indicating an interface state, a type indicating Ethernet (registered trademark), a MAC address indicating a MAC address, a maximum Max Bandwidth indicating the bandwidth, Element_ID for identifying the accommodation element, IP Address indicating the IP address and subnet mask value, If Index indicating the IfIndex value of the interface obtained by element connection, and identifying the parent interface Parent IF_ID, Child IF_ID for identifying a child interface, Virtual Type, and IfSpeed are registered.

  In FIG. 4C, the link information table 123 includes a Link_ID for identifying the link, a Source IF_ID for identifying the source interface, a Destination IF_ID for identifying the destination interface, and a failure status. A registered failure flag, a bandwidth indicating a link band, a parent link ID for identifying a parent link, a child link_ID for identifying a child link, and a virtual type indicating a type of a logical link are registered.

  Further, the network interface unit 111 receives Trap from the routers 211 to 214 in which the failure has occurred (K6), and acquires the IfIndex value of the router 211 to 214 in which the failure has occurred from the Trap information. Note that the network interface unit 111 may periodically ping the IP address of each interface to recognize an interface that does not react as a failure.

  Then, the network interface unit 111 searches the database 115 using the IfIndex value or the IP address as a key, and identifies the interface where the failure has occurred. When the interface in which the failure has occurred is specified, the virtual type attribute of the interface is confirmed, and it is confirmed whether or not a link to which link aggregation is applied is configured.

  When configuring a link to which link aggregation is applied, the special link corresponding unit 112 subtracts the band of the link. That is, the network interface unit 111 pings the IP address of the interface. If there is a response, it is determined that some of the interfaces constituting the link aggregation have gone down, and requests the IfSpeed value from the routers 211 to 214. Further, based on the determination result based on the IfIndex value, the logical link performing link aggregation is specified, and the If Speed value of the logical link is acquired. Then, the If Speed value of the failed interface is subtracted from the bandwidth attribute value of the logical link, and the Bandwidth value of the logical link stored in the database 115 is updated.

On the other hand, when there is no response from the interface to Ping, it is determined that all the interfaces constituting the link aggregation are down, the link bandwidth value is updated, and a failure flag is set.
Further, the network interface unit 111 receives a trap indicating recovery from the routers 211 to 214 in which the failure has occurred (K6), and acquires the IfIndex value of the routers 211 to 214 that have recovered from the trap information. Note that the network interface unit 111 may periodically ping the IP address of each interface, and recognize that the failure recovery is performed when an unresponsive interface continuously reacts a plurality of times.

  Then, the network interface unit 111 searches the database 115 using the IfIndex value or the IP address as a key, and identifies the interface that has recovered from the failure. When the interface that has recovered from the failure is specified, the virtual type attribute of the interface is confirmed, and it is confirmed whether or not a link to which link aggregation is applied is configured.

  When configuring a link to which link aggregation is applied, the special link corresponding unit 112 updates the bandwidth of the link. That is, the network interface unit 111 pings the IP address of the interface. If there is a response, the router 211-214 is requested for an IfSpeed value. In addition, based on the determination result based on the IfIndex value, the logical link performing link aggregation is specified, and the If Speed value of the logical link is acquired. Then, the If Speed value of the interface that has recovered from the failure is added to the bandwidth attribute value of the logical link, and the Bandwidth value of the logical link stored in the database 115 is updated.

When the network interface unit 111 collects interface information at the time of failure occurrence or failure recovery, it sends the interface information to the special link handling unit 112 (K7), and stores the interface information and link information in the database 115. (K8).
When the special link corresponding unit 112 detects the special link including the link aggregation, the special link corresponding unit 112 stores the information on the interface constituting the special link and the special link information in the database 115 (K9).
Then, when a route information or bandwidth information acquisition request is made from the human interface 102 or the external system 103 (K10), the route calculation unit 113 acquires link information, interface information, and cost information from the database 115 (K11, K12). ).

  Then, the route calculation unit 113 calculates a route between any two points based on the cost value given to the interface only for the L3 logical link. As the cost value assigned to the interface, for example, when the routing protocol is OSPF, OSPF Metric can be used. Further, for example, a Dijkstra method can be used to calculate a route between any two points. Further, the link information constituting the route can be given to the route information as its bandwidth information (Bandwidth attribute of the link information table 123).

Then, when calculating the route between any two points, the route calculation unit 113 returns the route information to the human interface 102 or the external system 103 (K13) and sends the route information to the resource management unit 114 (K14).
When the resource management unit 114 receives the route information from the route calculation unit 113, the resource management unit 114 calculates the available bandwidth of the route at the present time, and returns the bandwidth information to the human interface 102 or the external system 103 (K15).

FIG. 5 is a diagram illustrating an example of a method for calculating the available bandwidth on the network.
In FIG. 5A, assuming that the L3 link resource between the routers 211 and 212 is 100 Mbps, and the L3 link resource between the routers 212 and 214 is 1 Gbps, it is normally used in the route from the router 211 to the router 214. 100 Mbps can be secured as a possible bandwidth.

  Further, in FIG. 5B, since link aggregation is applied between the routers 211 and 212, the L3 link resource between the routers 211 and 212 is 200 Mbps, and the L3 link resource between the routers 212 and 214 is 1 Gbps. As a result, 200 Mbps can be secured as an available bandwidth in the route from the router 211 to the router 214.

In the IP network having a connection link using link aggregation in which the connection link in the IP layer and the connection link in the lower layer correspond to 1: N, the link aggregated link is transferred to another IP. It can be centrally managed as a link similar to a layer link, and the IP network route and bandwidth information of the route can be used for service management.
Note that the network interface unit 111, the special link correspondence unit 112, the route calculation unit 113, and the resource management unit 114 can be realized by causing a computer to execute a program in which instructions corresponding to these functions are described.

It is a block diagram which shows schematic structure of the network management apparatus which concerns on one Embodiment of this invention. It is a sequence diagram which shows operation | movement of the network management apparatus 101 of FIG. It is a figure which shows an example of the determination method of the link aggregation which concerns on one Embodiment of this invention. 4A is a diagram showing a configuration example of the element table 121 in FIG. 1, FIG. 4B is a diagram showing a configuration example of the IF table 122 in FIG. 1, and FIG. 4C is a diagram in FIG. It is a figure which shows the structural example of the link information table. It is a figure which shows an example of the calculation method of the usable bandwidth on a network.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Network management apparatus 102 Human interface 103 External system 111 Network interface part 112 Special link corresponding part 113 Path | route calculation part 114 Resource management part 115 Database 116 External interface 121 Element table 122 IF table 123 Link information table 211-214 Router

Claims (9)

Link aggregation detection means for detecting a link to which link aggregation is applied;
A network management apparatus comprising: interface information management means for individually managing information of an interface constituting a link to which the link aggregation is applied. The interface information management means includes
An element table that registers the attributes of the elements that house each interface;
An IF table that registers pointers to other interfaces to which the type, speed, and link aggregation of each interface are applied;
2. The network management apparatus according to claim 1, further comprising: a link information table that registers a type of each link, a bandwidth, and a pointer to a corresponding interface. Failure detection means for detecting interface failure;
First determination means for determining whether the interface in which the failure is detected constitutes link aggregation based on a reference result of the IF table;
The network management apparatus according to claim 2, further comprising: a first update unit that updates a total bandwidth of logical links that constitute a link aggregation based on a determination result by the first determination unit. Recovery detection means for detecting interface recovery;
Second determination means for determining whether the interface from which the recovery is detected constitutes link aggregation based on a reference result of the IF table;
4. The network management device according to claim 2, further comprising: a second update unit configured to update a total bandwidth of logical links constituting the link aggregation based on a determination result by the second determination unit. Link aggregation detection means for detecting a link to which link aggregation is applied;
Band information calculation means for calculating band information of the entire logical link to which the link aggregation is applied based on a failure occurrence state of each physical link to which the link aggregation is applied. Network management device.   6. The link aggregation detection unit identifies a logical link to which link aggregation is applied based on a relationship between a logical IF of each interface constituting the link and a corresponding physical IF. The network management device according to any one of claims.   The network according to claim 6, wherein the link aggregation detection unit identifies a link to which the link aggregation is applied based on an association between a logical interface and a physical interface determined from an If Stack Status value. Management device. Detecting a link to which link aggregation is applied;
A network management program for causing a computer to execute the step of individually managing information of interfaces constituting a link to which the link aggregation is applied. Detecting a link to which link aggregation is applied;
Causing the computer to execute a step of calculating bandwidth information of the entire logical link to which the link aggregation is applied based on a failure occurrence state of each physical link to which the link aggregation is applied. Network management program.

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