公开(公告)号：US20190020626A1

公开(公告)日：2019-01-17

申请号：US15650913

申请日：2017-07-16

Applicant: Cisco Technology, Inc.

Inventor： Kabiraj SETHI ,  Shivangi SHARMA ,  Peter G. JONES ,  Jimit MAHETA

IPC: H04L29/06 ,  H04L12/753

CPC classification number: H04L63/0236 ,  H04L12/4641 ,  H04L41/02 ,  H04L43/10 ,  H04L45/48 ,  H04L49/15 ,  H04L49/604 ,  H04L69/03

Abstract: In one embodiment, a system, apparatus, and method are described for providing limited data connectivity for devices connected to a switch when the switch enters bootloader mode. The switch has a central processing unit (CPU), the CPU comprising a reload handler and an application-specific integrated circuit (ASIC), the ASIC comprising ASIC forwarding logic. The ASIC is instructed, by the reload handler, to store an ASIC database, the ASIC database for storing the ASIC forwarding logic. The reload handler maintains a physical layer (PHY) state of the switch. Use of spanning tree protocol (STP) and Transmission Control Protocol (TCP) keepalive is disabled in the switch. A state of stack hardware is retained in switch memory. New ports of the switch are prevented from becoming active, and the ASIC forwarding logic is, in response to receiving the instruction, stored in the ASIC database. Related systems, apparatuses, and methods are also described.