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The primary responsibility of ONIE is to locate a network operating system(NOS) installer and execute it.

Platform Name and Identification¶

For identifying the running platform. ONIE uses the following definitions:

arch – The CPU architecture. The currently supported architectures are:
- arm
- powerpc
- x86_64
machine – A string of the form <VENDOR>_<MODEL>.
machine-revision – A string of the form r<NUMBER>, used to trackdifferent hardware revision of a machine
platform – A string of the form <ARCH>-<MACHINE>-<MACHINE-REVISION>
switch-silicon-vendor – A string of one of the following, used totrack ASIC silicon vendor:

Silicon Vendor	String
Broadcom	bcm
Cavium	cavium
Centec	centec
Marvell	mvl
Mellanox	mlnx
Nephos	nephos
Qemu	qemu

Note

The above definitions place some restrictions on the validcharacters allowed for the <ARCH>, <VENDOR> and <MODEL>strings.

The allowable characters in the above strings are:

VENDOR - cannot contain _ (underscore) or - (hyphen) characters
MODEL - cannot contain - (hyphen) character. _(underscore) is OK
ARCH - cannot contain _ (underscore) or - (hyphen) characters

At runtime, ONIE provides the onie-sysinfo command, which can beused to dump this information and more. See theSystem Information section for more about the onie-sysinfocommand.

The platform name must remain consistent across all ONIE modes asdescribed in Network Operating System Interface.

Installer Discovery Methods¶

ONIE attempts to locate the installer through a number of discoverymethods. The first successful method found is used to download andrun an installer.

Note

Even though an installer is successfully found, theinstaller can fail, in which case ONIE moves on to the next discoverymethod.

The following methods are tried in this order:

Statically configured (passed from boot loader)
Local file systems (USB for example)
Exact URLs from DHCPv4
Inexact URLs based on DHCP responses
IPv6 neighbors
TFTP waterfall

Note

The discovery methods are tried repeatedly, forever, until asuccessful image install occurs.

The general image discovery procedure is illustrated by thispseudo-code:

The subsequent sections describe these methods in detail.

Default File Name Search Order¶

In a number of the following methods, ONIE searches for default filenames in a specific order. All the methods use the same default filenames and search order, which are described in this section.

The default installer file names are searched for in the following order:

onie-installer-<arch>-<vendor>_<machine>-r<machine_revision>
onie-installer-<arch>-<vendor>_<machine>-r<machine_revision>.bin *
onie-installer-<arch>-<vendor>_<machine>
onie-installer-<arch>-<vendor>_<machine>.bin *
onie-installer-<vendor>_<machine>
onie-installer-<vendor>_<machine>.bin *
onie-installer-<cpu_arch>-<switch_silicon_vendor>
onie-installer-<cpu_arch>-<switch_silicon_vendor>.bin *
onie-installer-<arch>
onie-installer-<arch>.bin *
onie-installer
onie-installer.bin *

Note

ONIE 2017.08 added the .bin extension to all the default filenames. Previous ONIE versions do not look for file names with the.bin extension.

For a hypothetical x86_64 machine, the default installer file nameswould be:

Note

ONIE 2016.05 introducedonie-installer-<cpu_arch>-<switch_silicon_vendor>. All previousONIE versions do not include this naming item.

Note

In the case of ONIE self-update mode, the file name prefix isonie-updater instead of onie-installer.

Note

For the exact file names used for your specific hardwareplatform please contact your NOS vendor or your hardwarevendor.

Static Configuration Method¶

This method is intended for engineering use only; for example, duringthe porting of ONIE to a new platform. In the boot loader, the usercan statically configure an installer URL that ONIE will use bysetting the install_url kernel command line argument.

Local File System Method¶

In this method, ONIE searches the partitions of locally attachedstorage devices looking for one of the ONIE default installer filenames.

See Default File Name Search Order for more information on the default file names.

This method is intended for the case where the NOS installer isavailable on a USB memory stick plugged into the front panel.

Two file system types are supported, the popular vFAT partition type(common on commercially availabe USB sticks) and Linux’s ext2.

Note

OSX’s Disk Utility by default will write out an unsupported partition type.Please use the diskutil command line tool for formatting:

The general algorithm for locating the installer on local storageproceeds as follows:

Ethernet Management Port Configuration¶

In order to perform network based image discovery the Ethernetmanagement console must first be configured. The followingconfiguration methods are tried in order:

Static configuration – Set via the ip kernel command line argument
DHCPv6 – Planned, but not yet implemented
DHCPv4
Link Local IPv4 address (see RFC-3927)

The static configuration uses the ipLinux kernel command lineargument.

DHCP Requests and Responses¶

DHCP provides a powerful and flexible mechanism for specifying theinstaller URL exactly. During the DHCP request, ONIE sets a number ofoptions to help the DHCP server determine an appropriate response.

The following options are set during the request:

DHCP Request Options¶
Option	Name	ISC option-name	RFC

Slither Io Network Discovery Serial Key