Juniper® JNCIA Exam Cram Notes : junos Software Architecture

2. Junos OS Fundamentals

2.2 Software Architecture

The jdocs package contains the complete JUNOS software documentation set. Jbundle is a single file which contains all the packages.

The removable media is the first boot location examined. Solid-State Drive is the second boot examined after removable media.

It takes about 5 minutes to completely boot the junos device. Enough time must be given to boot the Juniper devices in compared to other devices.

The solid-state flash drive is the primary boot media used to boot the juniper devices. Besides this, the secondary boot media is the Hard Drive.

Junos software updates are contained in four packages. Among the above, jroute and jdocs are two update packages. Along with this, the other two are jpfe and jkernel.

We can actually backup a software and configuration to rotating disk on junos devices. This backup functionality is best used when system is stable and before any major upgrade to ensure system recovery when necessary.

We use 'request system snapshot' command in our operational mode to backup a system software and configuration so that it might come handy during the time of recovery.

In case, if we want two juniper devices working as a single stack with primary and backup routing engine then the software version of both juniper devices must be same. Otherwise our redundancy process may not work properly.

In JUNOS software, every interface requires at least one logical interface. That logical interface is known as unit. This is where all addressing and protocol information is configured

Action modifiers are log, count and sample. Along with this there is also another action modifier and it is syslog. We can include any combination of action modifiers in a single filter term.

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