Chapter 1 3 System Recovery; Prerequisites; Console Access; Boot Image - Cisco ASR 5500 Administration Manual

System Recovery
This chapter describes how to recover a system after it has failed to complete a reboot following a power
off cycle or interruption of the normal boot sequence following a reload command.
This system recovery process interrupts subscriber service by dropping any existing flows and preventing
Caution
traffic from being processed during the boot interval. It should only be initiated as an emergency measure.
This chapter includes the following sections:
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Prerequisites

Successful recovery from a failed reboot requires that you have access to the system via a console port, and
have an uncorrupted copy of the StarOS boot image file stored in flash memory on the management card, or
accessible from an external memory device.

Console Access

The boot recovery sequence can only be executed via a terminal connected to the serial console port on the
active management card. This connection can be through a terminal server that is accessible via a LAN
interface.
The boot recovery sequence can only be viewed via the Console port.

Boot Image

The boot recovery command line interface allows you to specify from which boot image you would like to
boot the system. If the system failed to reload following a software update, you can initiate a boot from a
previously stored image.
Prerequisites, page 179
Accessing the boot CLI, page 180
Booting from a Selected Image, page 181
C H A P T E R
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