automation, networking, worklife
Juniper ARP Policer on PTX
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...
17 Aug 2021
Juniper i40e NVM Firmware Upgrade
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...
20 May 2021
Juniper Direct vs Local Routes
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...
31 May 2020
Juniper Default ARP Policer
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...
11 May 2020
Juniper Branch SRX LACP Weirdness
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...
25 Apr 2020
Juniper QFX10K IPFIX Gotchas
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...
08 Apr 2020
Juniper MX Upgrades Causing Overheating
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...
21 Mar 2020
QFX Upgrades - Check Host Version
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...
19 Jan 2020
Junos SNMP via Routing Instance
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,...
12 Jan 2020
New Role with Valve
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.
19 Sep 2019
This blog is now hosted via Netlify, rather than GitHub Pages. It is still built using Jekyll, but I updated the theme to Mediumish.
18 Aug 2019
CCIE Renewed Once More - Exam 400-101 v5.1
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...
01 Jun 2019
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