Apparatus and method for detecting network failure location

• US 7,607,049 B2
• Filed: 04/28/2006
• Issued: 10/20/2009
• Est. Priority Date: 12/21/2005
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Nomura, Yuji, Yasuie, Takeshi
• Primary Examiner(s): LE, DIEU MINH T
• Application Number:
  US11/413,154
• Publication Number:
  US 20070174724A1
• Time in Patent Office: 1,271 Days
• Field of Search: 714/41, 714/43, 714/44, 714/54, 370/242, 370/218, 370/252
• US Class Current: 714/43
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways

Abstract

A L2 loop failure location generated in any one of a plurality of search target apparatuses disposed in network is detected in a short time. A network failure location detecting apparatus executes the steps of broadcasting packets with a plurality of different source MAC addresses; acquiring statistical information that is information of a learning port of the plurality of different source MAC addresses learned by each of the plurality of search target apparatuses; finding whether the number of the learning ports of the plurality of different source MAC addresses is one or two from the acquired statistical information; and determining that the L2 loop failure location is the search target apparatus including two learning ports of the plurality of different source MAC addresses.

Claims

1. A method of searching for a L2 loop failure location generated in any one of a plurality of search target apparatuses disposed in a network with a network failure location detecting apparatus, the method comprising:

broadcasting, from the detecting apparatus, a plurality of packets respectively having different source MAC addresses;

acquiring statistical information of learning ports, which have learned the plurality of different source MAC addresses in each of the plurality of search target apparatuses;

finding whether there are, in any of the plurality of search target apparatuses, two learning ports which have respectively learned different source MAC addresses from the acquired statistical information; and

determining that the L2 loop failure location is at the search target apparatus of which two learning ports are found as respectively having learned the different source MAC addresses.

2. The network failure location detecting method according to claim 1, further comprising:

sending, from the detecting apparatus, an acquisition request command in the Simple Network Management Protocol that is a MIB (Management Information Base) acquisition request to the plurality of search target apparatuses disposed in the network preliminarily before broadcasting the packets respectively having different source MAC addresses;

receiving response packets from the search target apparatuses capable of responding; and

acquiring addresses of the search target apparatuses from the received response packets.

3. The network failure location detecting method according to claim 1, wherein

if the finding finds a search target apparatus that includes only one learning port which has learned the plurality of source MAC addresses, the determining determines that a network failure location exists in the direction of the one learning port.

4. The network failure location detecting method according to claim 1, further comprising:

sending from the detecting apparatus to the search target apparatus including the two learning ports which have respectively learned different source MAC addresses, a message for blocking an interface of either one of the two learning ports to bypass the L2loop failure.

5. A network failure location detecting apparatus that detects a L2 loop failure location generated in any one of a plurality of switches disposed in a network, the network failure location detecting apparatus comprising:

a statistical information acquiring unit to broadcast a plurality of packets respectively having different source MAC addresses, and to acquire statistical information of learning ports, which have learned the plurality of different source MAC addresses in each of the plurality of search target apparatuses; and

a data analyzing unit to find whether there are, in any of the plurality of search target apparatuses, two learning ports which have respectively learned different source MAC addresses from the acquired statistical information and to determine that the L2 loop failure location is at the search target apparatus of which two learning ports are found as respectively having learned different source MAC addresses.

6. The network failure location detecting apparatus according to claim 5,

wherein the statistical information acquiring unit sends an acquisition request command in the Simple Network Management Protocol that is a MIB (Management Information Base) acquisition request to the plurality of search target apparatuses disposed in the network preliminarily before broadcasting the packets respectively having different source MAC addresses, and

wherein the data analyzing unit receives response packets from the search target apparatuses capable of responding and acquires addresses of the search target apparatuses from the received response packets.

7. The network failure location detecting apparatus according to claim 5,

wherein when the data analyzing unit finds a search target apparatus includes only one learning port which has learned the plurality of source MAC addresses, the data analyzing unit determines that a network failure location exists in the direction of the one learning port.

8. The network failure location detecting apparatus according to claim 5,

wherein the statistical information acquiring unit sends to the search target apparatus including the two learning ports which have respectively learned different source MAC addresses, a message for blocking an interface of either one of the two learning ports to bypass the L2 loop failure.

9. The network failure location detecting apparatus according to claim 5, wherein the network failure location detecting apparatus is constituted by a terminal connected to any one of a plurality of switches disposed in the network.