I’ve written before about the default ARP policer on Juniper MX. It can create some odd failure conditions when you’re connected to noisy networks such as large Internet Exchanges. Junos...
Juniper Routing Engines with VM Host need an i40e NVM firmware upgrade. The procedure is a pain in the ass, and documentation is not great. But you can’t avoid the...
Juniper routers consider a directly configured IP as a “direct” route, except when you use a /32 mask (for IPv4). Then it is a “local” route. This caused me some...
Juniper devices have a default ARP policer that drops ARP requests and responses over 150kbps. By default, this is an aggregate policer that applies to all interfaces. This can lead...
Juniper SRX 300 Series firewalls may stop forwarding traffic in some situations. The firewall says it is forwarding the traffic, but it doesn’t work. Monitoring traffic looks OK, ARP entries...
IPFIX is problematic on the Juniper QFX10K switches. Documentation is sparse, and doesn’t have a complete configuration. Behavior changes between versions in undocumented ways. Here’s a couple of things I...
Juniper changed the way they do temperature management on MX240 and MX480 chassis devices, somewhere between 15.1 and 17.3. The net result is that your chassis might run hotter after...
I came across a situation where a software upgrade failed for some members in a Juniper QFX Virtual Chassis. There is a known issue with upgrades with a certain configuration...
Juniper routing instances are very useful when you need separate routing tables on the one device, for example to separate customers. Junos lets you configure SNMP polling of routing instances,...
I have started a new role as a Network Engineer with Valve Corporation. My period of unemployment was short-lived, and I am gainfully employed once more.
I’ve given in to the Sunk Cost Fallacy once more: I’ve renewed my CCIE. There was a lot of foot dragging this time around, and I only had four months...
