Channelizing interfaces on QFX5200

The 32 ports on Juniper QFX5200 can operate as 100G or 40G, based on the optic inserted in the port. The 100G ports can work as 100G or they can be channelized to 50G or 25G. The 40G ports can work as 40G or they can be channelized to 10G. The 100G/40G appeat as et-fpc/pic/port… Keep reading »

Statistics for logical child links in aggregated interface on QFX10K

On QFX10k, by default you cannot see the statistics for the logical child links of an aggregated interface. Based on the family configured(ethernet-switching, inet and so on), you might see some of them(on only some of the child links, on only one direction or some other times, duplicated stats). To solve the problem, you need… Keep reading »

DHCP Relay on EX9200

In this post we will see how DHCP Relay is configured on EX9200. Actually, the same type of configuration can be applied on any Juniper platform that supports ELS. DHCP Relay allows clients to get an IP address even when they are not in the same broadcast domain with the DHCP server. The DHCP Relay… Keep reading »

OpenNMS to monitor Juniper, Cisco and Linux devices

This post will be about OpenNMS and what it can do to monitor the network. OpenNMS is similar to LibreNMS covered here. The installation is pretty straighforward and installation steps for various OSs are provided. The official documentation containing installation steps, tutorials, links to community is on OpenNMS wiki. But let’s see how this looks… Keep reading »

LibreNMS to monitor Juniper, Cisco and Linux devices

This post will be about LibreNMS and what it can do for you. LibreNMS is an open-source network monitoring tool and it is a fork of Observium. LibreNMS provides graphs, notifications to allow you to monitor the network and be informed of any changes taking place. The documentation is pretty exhaustive and you can get… Keep reading »

GRE tunnel between Juniper and Linux

This is a short howto about how you can bring up a GRE tunnel between Juniper devices and Linux, Ubuntu in this case. Just to provide some basics about GRE tunnels: Each endpoint has to have reachability to the other endpoint One endpoint must use the GRE tunnel to reach the destination of the tunnel(recursive… Keep reading »

Proxy ARP on Junos

In this post I will discuss about Proxy ARP feature on Junos, more exactly on EX4200 platform. When a host sends an ARP Request to a switch configured with Proxy ARP, the switch send its own MAC address to resolve the ARP for the destination host and the source host starts to used the switch… 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 »

Link aggregation between Juniper and Linux

I had recently to configure link aggregation between a Linux host and a Juniper device. On Linux this is called bonding and the logical interface is usually called bondX. On Juniper this is called link aggregation and the logical interface is called aggregated ethernet, aeX. For this example I used Ubuntu and based on the… Keep reading »