Cisco Cisco Packet Data Gateway (PDG) Guía Para Resolver Problemas
Software Management Operations
▀ Configuring the Boot Stack
▄ Cisco ASR 5000 Series System Administration Guide
OL-22970-01
Configuring the Boot Stack
The boot stack consists of a prioritized listing of operating system software image-to-CLI configuration file
associations. These associations determine the software image and configuration file that gets loaded during system
startup or upon a reload/reboot. Though multiple associations can be configured, the system uses the association with
the highest priority. In the event that there is an error processing this association (e.g. one of the files cannot be located),
the system attempts to use the association with the next highest priority. Priorities range from 1 to 100, with 1 being the
highest priority. The maximum number of boot stack entries that may be configured in the boot.sys file is 10.
associations. These associations determine the software image and configuration file that gets loaded during system
startup or upon a reload/reboot. Though multiple associations can be configured, the system uses the association with
the highest priority. In the event that there is an error processing this association (e.g. one of the files cannot be located),
the system attempts to use the association with the next highest priority. Priorities range from 1 to 100, with 1 being the
highest priority. The maximum number of boot stack entries that may be configured in the boot.sys file is 10.
Boot stack information is contained in the boot.sys file, explained earlier in the Understanding the boot.sys File section
of this chapter. In addition to boot stack entries, the boot.sys file contains any configuration commands required to
define the system boot method as explained in the section that follows.
of this chapter. In addition to boot stack entries, the boot.sys file contains any configuration commands required to
define the system boot method as explained in the section that follows.
System Boot Methods
The following methods are supported for loading and executing system software and configuration files on startup:
Local-Booting Method: The default boot method that uses software image and configuration files stored locally
on the system. Upon system startup or reboot, the system looks on one of its local devices (
,
,
(SPC only), or /hd-raid (SMC only)) located on the primary SPC/SMC for the
specific software image and accompanying configuration text file.
When using the local-booting method, you only need to configure boot stack parameters.
Network-Booting Method: The system can be configured to obtain its software image from a specific external
network server while it is paired with a configuration text file that resides on the system. When using network
booting, you need to configure the following:
booting, you need to configure the following:
Boot stack parameters, which define the files to use and in what priority to use them
Boot interface and network parameters defining the SPIO management LAN interface and the methods
to use to reach the external network server
Network booting delay time and optional name server parameters defining the delay period (in seconds)
to allow for network communications to be established, and the IP address of any Domain Name
Service (DNS) name server that may be used
Service (DNS) name server that may be used
More detailed information on how to configure the system to use the network-booting method will be provided later in
this chapter.
this chapter.
Viewing the Current Boot Stack
To view the boot stack entries contained in the boot.sys file enter the following: