基本信息:
- 专利标题： 控制隧道传送循环检测的装置
- 专利标题（英）：Apparatus for controlling tunneling loop detection
- 申请号：CN200780025846.9 申请日：2007-07-06
- 公开(公告)号：CN101491019A 公开(公告)日：2009-07-22
- 发明人： 平野纯 , 吴振华 , 陈必耀 , 添明·B·高 , 林俊强
- 申请人： 松下电器产业株式会社
- 申请人地址： 日本大阪府
- 专利权人： 松下电器产业株式会社
- 当前专利权人： 松下电器产业株式会社
- 当前专利权人地址： 日本大阪府
- 代理机构： 北京市柳沈律师事务所
- 代理人： 胡琪
- 优先权： 188681/2006 2006.07.07 JP
- 国际申请： PCT/JP2007/063936 2007.07.06
- 国际公布： WO2008/004713 EN 2008.01.10
- 进入国家日期： 2009-01-07
- 主分类号： H04L12/46
- IPC分类号： H04L12/46 ; H04L12/56
Disclosed is a technique whereby a packet transferring apparatus (particularly, a tunnel entry point made to carry out packet encapsulation) becomes capable of detecting a tunneling loop signifying that a packet loops along the same route while undergoing encapsulation. With this technique, at packet transfer, a loop detection module of a router according to the present invention stores a TEL value (value of tunnel encapsulation limit for limiting the number of times of duplication of tunnel) set in an encapsulation header of this packet or stores a TEL value set in an encapsulation header of a packet sent back as an ICMP error. In addition, the loop detection module analyzes an increase/decrease variation pattern of the stored TEL value relative to time and, in a case in which the pattern agrees with a unique pattern (sawtooth-like pattern) appearing at the occurrence of a tunneling loop, estimates that a tunneling loop has occurred.