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.

公开(公告)号：US20160062432A1

公开(公告)日：2016-03-03

申请号：US14474356

申请日：2014-09-02

Applicant: CISCO TECHNOLOGY, INC.

Inventor： Ahmed FARAZ ,  Krishna Kumar VAVILALA ,  Kabiraj SETHI

IPC: G06F1/26 ,  H04L12/10

CPC classification number: G06F1/266 ,  H04L12/10 ,  H04L12/40045 ,  H04L12/413

Abstract: Embodiments described herein improve availability of a power plane in a network device by using a PoE manager that is separate from an operating system in the network device. For example, when the operating system (or a PoE application executing in the operating system) becomes unavailable, either because of failure or system upgrade, the PoE manager continues managing a power plane in the network device such that connected PDs continue to receive DC power. Stated differently, by using a PoE manager that is separate from the operating system, there is no fate sharing between the PoE manager and the operating system. If the operating system is unavailable, the PoE manager continues to provide the same power allotment to the PDs. As such, updates and failures which previously made the power plane unavailable no longer affect the power supplied to the PDs.

Abstract translation: 本文描述的实施例通过使用与网络设备中的操作系统分离的PoE管理器来提高网络设备中的电力平面的可用性。 例如，当操作系统（或操作系统中执行的PoE应用程序）变得不可用时，由于故障或系统升级，PoE管理器继续管理网络设备中的电源平面，以使连接的PD继续接收直流电源 。 换句话说，通过使用与操作系统不同的PoE管理器，PoE管理器和操作系统之间没有命运共享。 如果操作系统不可用，PoE管理器将继续向PD提供相同的功率分配。 因此，以前使电源平面不可用的更新和故障不再影响提供给PD的电源。

公开(公告)号：US20210325950A1

公开(公告)日：2021-10-21

申请号：US17302641

申请日：2021-05-07

Applicant: Cisco Technology, Inc.

Inventor： Ahmed FARAZ ,  Krishna Kumar VAVILALA ,  Kabiraj SETHI

IPC: G06F1/26 ,  H04L12/10 ,  H04L12/40 ,  H04L12/413

Abstract: Embodiments described herein improve availability of a power plane in a network device by using a PoE manager that is separate from an operating system in the network device. For example, when the operating system (or a PoE application executing in the operating system) becomes unavailable, either because of failure or system upgrade, the PoE manager continues managing a power plane in the network device such that connected PDs continue to receive DC power. Stated differently, by using a PoE manager that is separate from the operating system, there is no fate sharing between the PoE manager and the operating system. If the operating system is unavailable, the PoE manager continues to provide the same power allotment to the PDs. As such, updates and failures which previously made the power plane unavailable no longer affect the power supplied to the PDs.

公开(公告)号：US20180181178A1

公开(公告)日：2018-06-28

申请号：US15891908

申请日：2018-02-08

Applicant: Cisco Technology, Inc.

Inventor： Ahmed FARAZ ,  Krishna Kumar VAVILALA ,  Kabiraj SETHI

IPC: G06F1/26 ,  H04L12/413 ,  H04L12/10 ,  H04L12/40

CPC classification number: G06F1/266 ,  H04L12/10 ,  H04L12/40045 ,  H04L12/413

Abstract: Embodiments described herein improve availability of a power plane in a network device by using a PoE manager that is separate from an operating system in the network device. For example, when the operating system (or a PoE application executing in the operating system) becomes unavailable, either because of failure or system upgrade, the PoE manager continues managing a power plane in the network device such that connected PDs continue to receive DC power. Stated differently, by using a PoE manager that is separate from the operating system, there is no fate sharing between the PoE manager and the operating system. If the operating system is unavailable, the PoE manager continues to provide the same power allotment to the PDs. As such, updates and failures which previously made the power plane unavailable no longer affect the power supplied to the PDs.