Juniper

The simplest way to repeatedly run a Junos CLI command is to pipe the command to ‘refresh’. This will automatically repeat the command you have entered at the specified interval. It also prints a handy timestamp so you know exactly when the command was run. This works well in situations where you need to watch […]

Free Training Juniper has long offered free training in various guises. The current incarnation of this is available via Juniper’s learning portal. Here you can get access to free JNCIA and JNCIS level training, and discount vouchers to sit the certification test. There is a slight catch in that the voucher(s) can only be used

In the post on logical systems, I provided three examples. In this post, we are going to walk through in detail how to configure the third example. It consists of two pairs of logical systems, one pair using OSPF and the other using BGP. This walkthrough is being done on a vMX that has a

I think that Juniper logical systems are fantastic. They are a great way to study for certifications. In this post, we’re going to look at what they are, how to connect them together, and how to configure and work with them. Table of Contents What Is A Logical System Logical systems are a way of

When working with a Junos device that has a factory default configuration, you will sometimes see the following error message when trying to commit changes: This means no root password has been set. You can set one with the command below: Note that the password will be encrypted in the configuration file. The plain-text-password specifies

The Junos ‘annotate’ command is a handy way of placing comments into the configuration file. I haven’t seen it widely used in production networks. In non-production environments, it’s a helpful way to identify what project or which engineer has put test config onto the lab equipment. For example, if I’m testing some new feature or

For quite some time, I struggled with the question of how to connect multiple logical systems together on the same broadcast domain or subnet. Typically logical systems are connected to each other using logical tunnel (lt-) interfaces. These are point-to-point connections with only two endpoints. I always ended up with something that looked like the

When authenticating CLI users, the authentication-order statement controls how Junos checks the user credentials that are supplied. This configuration statement is sometimes misunderstood and doesn’t always behave as you might expect. Junos can authenticate users using (local) accounts and passwords on the device, RADIUS, TACACS+, or LDAPS. The authentication-order statement tells the device in which