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A QFX5100 allows for dot1q-tunneling, or Q-in-Q. If you ever configured dot1q-tunneling on an EX-switch, this configuration differs a lot from what you may be used to. This article offers an attempt to clarify and explain the configuration of a dot1q-tunnel on a standalone QFX5100 without an enhanced feature license.... [Read More]

This article explains how you can analyze the forwarding table on Junos. On this lab, I altered several metrics to make the traffic flow look like this: [Read More]

For a little while now, I have been wanting to do a Juniper IP VPN lab. I wanted to gather most of the basics into one post. In this post, I will elaborate on the different protocols and how they are configured. The complete configuration is posted at the bottom... [Read More]

Recently, I deployed a VCF consisting of some QFX5100's and some EX4300's. I found that the default configuration did not really protect the network well enough and I thought I’d share it in this post. On the QFX, you’ll find that storm-control is enabled by default. The first thing you'll... [Read More]

In Junos , OSPF authentication can come in one of three ways; none, simple or MD5. The default is to have no authentication. This means that the router will form a neighbor relationship with a neighboring router as long as the proper fields in the OSPF Hello’s are matching. Another... [Read More]

Juniper's Junos offers a lot of flexibility as well as nifty little tricks. I recently ran into the situation in which 'apply-path' really came in handy. For a particular service, a different subnet was provisioned under the same interface over and over again. I wanted to advertise all of the... [Read More]