IPFIX configuration example

Turning on IPFIX (IP Flow Information Export) on Juniper MX is a good idea if you want to know what’s going on. Not only can it provide you with a tremendous insight into the traffic traversing your network, you can also use the information provided by IPFIX to automatically divert... [Read More]
Tags: juniper

Juniper Virtual Chassis Fabric AE interface

Connecting other parts of the network to the VCF in a redundant way using Link Aggregation Groups (LAG) is very easy. A LAG can combine several Ethernet interfaces into a single logical link called an Aggregate Ethernet (AE) interface. When you are running a VCF, you’d best spread a LAG... [Read More]
Tags: juniper qfx vcf

Juniper Virtual Chassis Fabric

Having to deal with a network edge that organically grew as time passed, evolving into an ever more complicated constellation of switches, is frustrating. Looming in the back of my mind were choices made in a past I had no part of. Those choices strained growth and frustrated my attempt... [Read More]
Tags: juniper qfx vcf

Juniper MX routing engine redundancy

Juniper MX routers, except for the MX80, are capable of having two routing-engines (RE). In this article, I’ll configure an MX480 with some of the high-availability features offered by Junos. By using these features, you can decrease the downtime normally associated with a RE failure to an absolute minimum. Hardware... [Read More]
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MX RSVP firewall filter

Of course, you need to allow RSVP in the firewall filter you are using to protect the routing-engine. The book 'Juniper MX series' covers this very in-depth in chapter 4. It offers a very extensive guide or example on how you could go about building a proper firewall filter to... [Read More]
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Installing a bypass LSP into the forwarding table

After covering link-protection and node-link-protection here, I realized that I forgot one aspect. You can make Junos install the pre-signaled bypass LSP into the forwarding table. This is done by configuring a policy and by applying that policy under the [routing-options forwarding-table export ] stanza. A short example; [Read More]
Tags: juniper mpls rsvp

Fast reroute

Traffic sent across RSVP-signaled LSPs without any additional configuration is susceptible to quite some down-time when a node or a link in the network fails. In a previous article here, I made an LSP more robust by configuring a primary and a secondary LSP. Let’s further enhance the LSP by... [Read More]
Tags: juniper mpls rsvp

Primary and secondary LSPs for RSVP signaled LSPs

A failure somewhere in the network can cause for traffic traversing an RSVP-signaled LSP to drop. Several possibilities exist to reduce the impact a failure can have on RSVP-signaled LSPs. This article is about the creation of a secondary standby path in order to reduce downtime that is incurred upon... [Read More]
Tags: juniper mpls rsvp

Juniper QFX vlan-swapping

This is a quick and short article on how to perform vlan-swapping on a Juniper QFX5100. I was used to tunneling vlans in a QFX5100 by using the push-operation available through a vlan-map. With this in mind I was struggling to get vlan translation on the QFX5100 working. I was... [Read More]
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Basic RSVP signaled LSP on MX

This article is about the basic configuration on how to get an RSVP signaled MPLS LSP (label-switched path) working on a Juniper MX router. The focus will be on the minimum amount of configuration needed to create LSPs between the Tiberius and the Commodus router: [Read More]
Tags: juniper mpls rsvp

Juniper cos notes

These notes cover CoS on Juniper devices. The list of topics covered here correspond to the JNCIP-SP exam objectives. One objective is missing. I will cover the 'Given a scenario, demonstrate knowledge of how to configure and monitor CoS' somewhere else. [Read More]

Single-rate two-color policer on an EX.

Policing, also known as rate-limiting, can be used as an instrument to control how much traffic is allowed to flow in a certain direction. In Juniper, you can do this by using a policer as an action in a firewall filter. This article is about the configuration of two simple... [Read More]
Tags: juniper cos

Juniper multihomed IP VPN location.

This article offers some insight into how you could decide to build a multihomed Layer 3 IP VPN or Layer 3 MPLS VPN. First I’ll go over the topology. After this, you will find the PE and CPE configuration. I’ll end with some verification and show commands. The topology: [Read More]
Tags: juniper