Excluding interfaces from IRB State Calculations

As you know, in order you have an IRB up, you need to have at least one interface up on the VLAN for which the IRB is created. This condition is sometimes forgot by engineers troubleshooting why an IRB or RVI or SVI(in Cisco terms) is down. By default all interfaces part of the VLAN… Keep reading »

Short Reach Mode on QFX5100-48T

In this post I will discuss about short reach mode feature that is present on QFX5100-48T platform. QFX5100-48T-6Q platform has 48 10BASE-T ports and 6 QSFP+ ports. The short reach mode feature allows to save up to 5W of power usage in case it is activated on the 10BASE-T ports that use cables that are… Keep reading »

Virtual Chassis Fabric – Part II – Control and Forwarding Plane

In the Virtual Chassis Fabric – Part I – Overview we saw the high level details of VCF technology proposed by Juniper for small to mid-size datacenter. In this post we are going to discuss about the control and forwarding planes of VCF. The strong ties between forwarding plane and its discovery mechanism and the… Keep reading »

Virtual Chassis Fabric – Part I – Overview

In this post I will cover the basics of Virtual Chassis Fabric technology that Juniper recommends to deploy small and medium-sized datacenters. Virtual Chassis Fabric(VCF) allows to build a plug-and-play Ethernet fabric that scales up to 32 members and provides deterministic latency and over-subscription with an internal 3-stage Clos topology. A VCF is constructed using… Keep reading »

Junos-defaults group

Have you ever tried to to configure a user’s password that is shorter than 6 characters during the initial configuration and found out that you cannot do this? If you did, you should have seen this:   {master:0}[edit] root@qfx5100# set system login user test authentication plain-text-password New password: error: minimum password length is 6 {master:0}[edit]… Keep reading »

Junos Recovery on QFX5100/EX4600

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 »

In-Service Software Upgrade(ISSU) on QFX5100

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 »

Zero Touch Provisioning on Juniper devices using Windows

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 »

Zero Touch Provisioning on Juniper devices using Linux

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 »