Blogs

Industry First 1.6T Liquid Cooled Switch: QFX5250-64OE-L

By Riti Sharma posted 24 days ago
Extending HPE Juniper’s innovation leadership from 800G to 1.6TbE AI data center fabrics. HPE Juniper Networking has started shipping the industry's first 102.4 Tbps data center switch, featuring 64 x 1.6 Tbps OSFP-RHS ports, compliance with the Open Compute ORV3 standard, and 100% liquid-cooling efficiency, by using cold plates directly attached to the ASIC, the CPU, the DC-DC Converter, and the 64 x OSFP-RHS transceivers. This paper provides highlights of this switch. Introduction AI Data Center infrastructure puts unique demands on the network. Traffic between servers is high volume, latency must remain consistent, and power consumption ...

250 Articles on TechPost

By Nicolas Fevrier posted 05-29-2026
Almost 250 technical articles published on the TechPost platform, let's try to summarize it in a single page with links to all these posts with a short abstract. Introduction Juniper Networks, now HPE Juniper Networking, is, at its very foundation, a technological company. When we opened the TechPost platform with the motto " Byte-Sized Articles on Juniper Solutions by Network Engineers, for Network Engineers", we wanted to create a place where Juniper engineers could share their knowledge and experience on technologies, products and protocols with no marketing fluff. To date, we published close to 250 articles and it's now becoming challenging ...

Juniper Routers and Switches Power Observability

By Nicolas Fevrier posted 05-29-2026
Your routers and switches display power usage counters, but what are they representing and can you trust them? Let’s try to answer these questions today. Introduction Different initiatives around power are ongoing, from characterization (power calculators) to network-level power optimization, but today we will focus on the observability part: what can we monitor and can we trust these numbers. Figure 1: HPE Juniper Networking Initiatives around Energy TL;DR “ It's an awfully long article, I’m a busy engineer and don’t have time for all the details, just gimme the results please... ” Ok, ok… I admit it's a very long article, ...

SRX MNHA: VRRP

By Karel Hendrych posted 05-28-2026
This TechPost describes an alternative solution to the native SRX Multi Node High Availability (MNHA) Switching/Hybrid Layer 2 (L2) Virtual IP address (VIP) mechanisms using Virtual Router Redundancy Protocol (VRRP). MNHA combined with VRRP can offer more flexibility and speed up convergence in some failure scenarios. The solution addresses current limitations of the native MNHA L2 VIP mechanism compared with the traditional SRX chassis-cluster technology. The additional configuration should be seen as a worthwhile investment for the flexibility and better convergence times, albeit making the configuration slightly more complex. Introduction Firewall ...

Hybrid LLM+Python Architecture

By christian graf posted 05-27-2026
Sixth and last part of the Series on the Context-Files and JMCP, covering hybrid LLM and Python Architecture. Series Navigation: Part 1: Introduction & Basics Part 2: Tokens & Memory Part 3: Optimization & Alerting Part 4: File Management Part 5: Redis & Performance Part 6: Hybrid Architecture ← You are here Introduction In Parts 1-5, we built up context file techniques for managing LLM sessions, optimizing token usage, and storing data in Redis. In this final part, we bring it all together: a hybrid architecture where the LLM orchestrates purpose-built Python scripts ...

SRv6 Static LSPs

By Ricardo Dominguez posted 05-26-2026
There are several approaches to deploying SRv6 Traffic Engineering (TE) tunnels (LSPs), depending on the operational and automation requirements of the network. These approaches include explicitly defined (static) LSPs, dynamically computed LSPs using Constraint-Based Shortest Path First (CSPF), and centrally orchestrated paths provisioned through a WAN Controller. In this two-part technical blog series, we will take a deep dive into SRv6 TE LSP architectures and operational models, focusing on both static and dynamic path computation techniques. The series will explore how SRv6 enables flexible and scalable traffic engineering, while also highlighting the ...

PTX12008 Power Distribution and Optimization

By Gurmeet Singh posted 05-17-2026
Learn how the PTX12008 optimizes power consumption through automatic and operator-controlled mechanisms such as adaptive fan management, unused port shutdown, selective PFE offlining, MACsec clock gating, and dynamic fabric or line card power control to improve energy efficiency in high-capacity networks. Introduction The PTX12008 is a 8-slot modular chassis running Junos-EVO. It inherits the of power optimization/efficiency features introduced and validated on the Junos-EVO. Power efficiency is increasingly important as network capacity is growing. The EVO platform integrates granular power control at every level of the forwarding pipeline from ...

Context-File Redis and High-Performance Storage

By christian graf posted 05-14-2026
Fifth part of the Series on the Context-Files and JMCP, covering Redis and high-performance Storage. Series Navigation: Part 1: Introduction & Basics Part 2: Tokens & Memory Part 3: Optimization & Alerting Part 4: File Management Part 5: Redis & Performance ← You are here Part 6: Hybrid Architecture Introduction In Parts 1–4, we covered context file fundamentals, token management, optimization & alerting, and file-based data collection. In this one, we'll explore Redis as a high-performance caching layer that enables massive scale and sub-second data access. ...

Navigating the PTX12008 LCD Module

By Nagaraj Suresh posted 05-13-2026
Let's explore the LCD module of the PTX12000 chassis. In this article, we will explain how it provides front-panel, touch-based, read-only monitoring of system health, FRU status, alarms, ports, and FPC information for simplified operational visibility and troubleshooting. Introduction The PTX12000 product line is engineered to meet the escalating demands of next generation core, DCI, and AI data center networks. Built on Juniper’s fifth generation Express silicon, the platform delivers massive scale, exceptional power efficiency, and long term architectural longevity, supporting high density 800GbE now and 1.6TbE class infrastructure in the future. ...

Securing IPVPN Connectivity on Juniper MX Using Inline IPsec

By Victor Ganjian posted 05-11-2026
This article provides an example of using the inline IPsec function available on Trio-6 based MX routers to secure IPVPN traffic over an MPLS core. After stepping through the configuration details of IPsec, verification is performed to validate proper operation and to reinforce the reader’s understanding of the implementation. Introduction As part of a recent customer POC test, an MX10004 (25.2R1-S1.4) with line card model LC9600 was positioned as a data center gateway router. In the topology diagram below, the MX10004 router, Edge-1, provides interconnectivity between the local EVPN/VXLAN-based multi-tenant data center (DC1) and a remote data center ...

Self Healing and Recovery Mechanisms For PTX12008

By Abhishek A Jain posted 04-24-2026
Modern core networks are expected to operate nonstop, even when components fail. In high-capacity chassis, fabric resiliency is fundamental requirement. This blog will describe in details the self-healing and recovery mechanisms built into the PTX12008 switching fabric. We’ll explore how the system detects faults, correlates failures, and automatically recovers from them... Ideally, before traffic is impacted. This article is the third of a series on PTX12000 fabric, we invite the readers to check the two previous posts: Rethinking Fabric Redundancy by Dmitry Shokarev PTX12008 Fabric Topology by Rahul Kulkarni Introduction: Why Fabric ...

DHCP on MNHA: Back to Basics

By James Rathbun posted 04-22-2026
Multi-Node High Availability (MNHA) is increasingly common as an alternative to chassis cluster. One operational question that surfaces quickly in MNHA deployments is Dynamic Host Configuration Protocol (DHCP). As of Junos 25.4R1, each node runs an independent DHCP process with no lease database synchronization between them. Unlike chassis cluster, DHCP state is not replicated across nodes. Left unaddressed, both nodes will respond to client Discovers, may offer addresses from overlapping ranges, and will produce a split lease database. This post covers the observed behavior and provides practical configurations. Introduction We're not going to take ...

SRX MPLS in Flow - Part 2

By Karel Hendrych posted 04-22-2026
The Junos 25.4R1 release expanded the list of SRX platforms supporting MPLS L3 VPN to include the SRX4600 and SRX4700. This brief tech post extends the previous 'SRX MPLS in Flow' article by presenting performance test of the SRX4600 using the 25.4R1 VRF-to-zone-mapping–based security policies. Introduction Prerequisite: read the SRX MPLS in Flow post for a thorough introduction. In 25.4R1, in addition to new platform support , Junos adds the ability to bind VRFs to zones , simplifying policy constructs by setting VRF context by zone instead of by rule match criteria. For NAT use cases the VRF-groups approach still applies as of 25.4R1. ...

Testing BGP Roles (RFC 9234) with the JMCP Server

By Julian Lucek posted 04-22-2026
LLMs have improved significantly over the last few months with the advent of reasoning models. We are now at the point where a general-purpose LLM, in conjunction with the Junos MCP server, is capable of doing sizable chunks of work on a network triggered by a single prompt, saving the user significant amounts of time. A valuable application of this is to help with the testing of new router features. While experimenting with new features is good fun, configuring all the pre-requisites (e.g. an IGP, the BGP sessions, AS numbers and so on) can be tedious and takes a long time, which is a barrier to getting round to testing these features for potential deployment ...

Context Files: File Management and Data Collection Strategies

By christian graf posted 04-21-2026
Fourth part of the Series on the Context-Files and JMCP, covering tokens, data formats, and memory management. Series Navigation: Part 1: Introduction & Basics Part 2: Tokens & Memory Part 3: Optimization & Alerting Part 4: File Management ← You are here Part 5: Redis & Performance Part 6: Hybrid Architecture Introduction Parts 1–3 covered context file fundamentals, token management, and optimization. Part 1 also introduced the enhanced JMCP server, which persists collected data directly to Redis or files — tool output never reaches the LLM context window. Instead of ...

Why Wi-Fi Design Day Matters

By Cherie Martin posted 04-09-2026
Contribution by Dobias van Ingen Community, curiosity, and doing Wi-Fi properly (with a bit of fun along the way ☕️📡 ) If you’ve ever tried explaining co-channel contention or roaming behavior at a dinner party, you know how quickly the room empties. 😅 But put a few hundred Wi-Fi professionals in a theatre, add real deployment stories, a shared passion for getting things right , and suddenly those conversations are not just welcome, they’re the main event. That, in a nutshell, is Wi-Fi Design Day . Ahead of this year’s Wi-Fi Design Day London (April 16, 2026), I sat down with Matt Starling (Ookla/Ekahau) to ...

Get Ready, Airheads: HPE + Juniper Networks Unite to Unleash the Future of AI-Native Networking

By Cherie Martin posted 04-01-2026
Punch your free ticket to one of the hottest events in tech, HPE Networking Days. A new era begins as HPE and Juniper Networks come together to deliver a next-generation event series designed for the innovators, builders, and hands-on pros who keep our world connected. Hey Elevate Members! I’m excited to share what’s coming with HPE Networking Days 2026. If you’ve attended before, you know these events are where breakthrough technology meets real-world expertise. This year, we’re taking things to a new level. For the first time, we’re bringing together the very best of HPE and Juniper Networks in one unified series, packed ...

MNHA, IPSec and Multiple Routing Instances

By James Rathbun posted 03-30-2026
INET.0 – What? MNHA, IPSec and Multiple Routing Instances Introduction There is a lot of good documentation available on designing and implementing MultiNode High Availability (MNHA) and Virtual Private Networks (VPNs) on SRXs - even AI generated configuration snippets that might lead a novice or experience professional astray. AI is a wonderful tool, but who hasn’t been a little frustrated by some AI output that includes commands or configuration recommendations that aren’t available on the platform. This post is not intended to be a 100% exhaustive guide on designing or configuring MNHA or VPNs with SRX deployments. The goal is to provide working ...

PTX12008 Fabric Topology

By Rahul Kulkarni posted 03-28-2026
Let's describes the PTX12008 chassis fabric topology and the bandwidth plumbing between Line Cards (LCs) and Switch Interface Boards (SIBs). Each LC integrates three BXF Packet Forwarding Engines (PFE), each made of a BX+BF pair, to deliver 54x 800G WAN ports, total 43.2Tbps per LC. Given 9 SIBs in the chassis, the fabric scaling ensures full LC bandwidth. Introduction PTX12008 is an eight‑slot Line Card (LC) chassis paired with 9 SIB slots to realize a non‑blocking, high‑capacity switching fabric. Each LC leverages the Juniper BX and BF chipsets, combined as BXF, to perform packet processing and cross‑fabric switching. The LC uses ...