March 2008
Intermediate to advanced
816 pages
25h 6m
English
Content preview from JUNOS Enterprise Routing
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CLI Review
The tool that will most often be used to configure and troubleshoot the router is the CLI. The JUNOS software CLI is one of the most user-friendly and feature-rich in the industry. Most users spend years attempting to master other router vendors’ CLIs, whereas JUNOS software can be mastered in just a few hours. Other configuration methods do exist, such as a web GUI called Jweb (see Figure 1-4), which is often used on the J-series routers. Note that the operation of Jweb is beyond the scope of this book, so all configuration examples will be shown via CLI commands instead.
Figure 1-4. Jweb
General CLI Features
The CLI has two modes: operational and configuration. Operational mode is where you can troubleshoot and monitor the software, router, and network. Configuration mode is where the actual statements for interfaces, routing protocols, and others are placed.
Tip
Every command that can be run in operational mode can also be used in configuration mode with the additional keyword run. For example, if the command show route is issued in operational mode, it can be issued as run show route in configuration mode.
When a user first enters the router via Telnet, Secure Shell (SSH), or direct console access, the user will see a login prompt. After entering the correct username and password, the user will be placed directly into operational mode. Operational mode will be designated ...
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