A networker's blogIt’s possible that for specific processes in Junos, the logs/traceoptions to be sent remotely. You can have there a syslog server where the logs will be stored for later analysis. The feature is activated for all processes that supports it and you can disable remote tracing specifically for each process. Keep in mind that once… Keep reading »
A default route is helping you to send packets to a device when you don’t have specific routing information about the destination of the packets hoping that the device will know how to route the packets to the destination. But it’s not always true. The device advertising the default route might not know how to… Keep reading »
It’s possible that after a failed installation, the QFX5100 might not work properly and be left in a state that makes it inaccessible from remote and needs a new software installation by copying the software from the USB to the QFX5100 or by using the installation from USB. There is another way to recover the… Keep reading »
By default, whenever there are multiple next-hops available to a destination, Junos installs only one next-hop in the forwarding-table, although the routing-table will show both next-hops. The user has the possibility to install multiple next-hops in the forwarding-table for the active route. This is called per-packet load balancing. Keep in mind that the load balancing… Keep reading »
In order to upgrade a device, traditionally a downtime is needed to upgrade the Routing Engine. You could avoid the downtime if you have redundant Routing Engines. This is possible in the chassis based platforms where features that enable high availability like Graceful Routing Engine Switchover (GRES), NonStop Routing (NSR) and NonStop Bridging (NSB) allows smoother… Keep reading »
Sometimes during a Junos upgrade, you might see messages like these: tar: +CONTENTS: time stamp Mar 15 06:28 2015 is 26228139 s in the future tar: +COMMENT: time stamp Mar 15 06:28 2015 is 26228139 s in the future This is because the current time on the Juniper device is in the past… Keep reading »
In this article we will see how you can use Windows OS to perform ZTP on Juniper devices. There was a previous article, Zero Touch Provisioning on Juniper devices using Linux, where we saw how ZTP works when Linux is used. The principle of ZTP is the same one: the network device with no configuration gets… Keep reading »
In this post we will see in action the Zero Touch Provisioning(ZTP) feature on Juniper devices using Linux. The Juniper device will be a QFX5100, but you can use any other Juniper EX or QFX devices. All you need from the Juniper device is the MAC address based on which the DHCP server will identify… Keep reading »
You can use sftp to transfer files to and from Juniper devices. You can initiate the transfer to and from the Juniper device from the Juniper device itself using the command “sftp” from shell: {master:1} lab@EX4200-VC> start shell % sftp usage: sftp [-1246Cpqrv] [-B buffer_size] [-b batchfile] [-c cipher] [-D sftp_server_path] [-F ssh_config]… Keep reading »
In Junos you have the possibility to see what has been changed between two commit actions using the command “show system rollback compare”. The output of the command will show you the configuration difference and the commit actions that are compared don’t need to be sequentially. Let’s see an example. I will add three family… Keep reading »