(19)

(11)

EP 2 661 852 A1

(12)

(43) Date of publication: 13.11.2013 Bulletin 2013/46 (21) Application number: 11752691.3 (22) Date of filing: 18.08.2011

(51) International Patent Classification (IPC):  H04L 29/06(2006.01) H04L 12/58(2006.01) (86) International application number: PCT/US2011/048180 (87) International publication number: WO 2012/094040 (12.07.2012 Gazette 2012/28)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 04.01.2011 US 983932 (71) Applicant: Cisco Technology, Inc. San Jose, CA 95134-1706 (US)	(72) Inventor: QUINLAN, Daniel San Bruno CA 94066 (US) (74) Representative: Kazi, Ilya et al Mathys & Squire LLP 120 Holborn London EC1N 2SQ London EC1N 2SQ (GB)