The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 13, 2010
Filed:
Apr. 05, 2005
Srinivas Subramanian, San Jose, CA (US);
Anand Jayaraman, Chennai, IN;
Balaji Venkat Venkataswami, Chennai, IN;
Srinivas Subramanian, San Jose, CA (US);
Anand Jayaraman, Chennai, IN;
Balaji Venkat Venkataswami, Chennai, IN;
Cisco Technology, Inc., San Jose, CA (US);
Abstract
A method and system for determining path maximum transfer unit (PMTU) in an Internet Protocol (IP) multicast is described. If a packet of a size greater than the MTU of any link of a path, with its Don't Fragment (DF) bit set, is sent by the source, the packet is dropped and an ICMP message, stating 'Destination unreachable, DF bit set', is sent to the source. The rate of messages to the source is controlled to avoid implosion of traffic. In response to the messages, the source sends multicast probe packets of multiple sizes to multicast distribution tree to determine its PMTU.