GRES alone only preserves the interface and kernel state. It does not preserve the control plane routing protocols (like OSPF or BGP). Neighbors will see the router drop briefly unless paired with Graceful Restart.
Are you configuring on a single core chassis or setting up a Chassis Cluster / Virtual Chassis across separate devices?
The term generally refers to the link redundancy and high‑availability features built around Juniper’s second‑generation Routing Engines (e.g., the RE‑2 and its successors). In Juniper routers, the Routing Engine (RE) is the brain of the system, handling all routing protocol processes, system management, and user access to the router. The RE‑2 (Routing Engine 2) – used in platforms such as the M5, M10, M20, M40 and M160 – features a 333 MHz processor, 768 MB of RAM, and storage options that include internal flash and a traditional hard disk. More modern variants (e.g., EX9200‑RE2) boast a quad‑core 1.73 GHz Intel processor with 16 GB of DRAM and dual front‑pluggable SSDs. juniper ren 2 link
If the line says Link to other RE: Down , you have a hardware or backplane issue.
If ge-0/0/9 (Link 1) experiences a hardware fault, Junos automatically shifts the broadcast domain over to ge-0/0/10 (Link 2) within milliseconds. 3. Juniper in Modern RAN (Radio Access Networks) GRES alone only preserves the interface and kernel state
When configuring a second Routing Engine link or sending commands between them, network administrators use specific Junos OS processes: 1. Linking REs for Redundancy
Thus, the .
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Juniper REN 2 Link is a next-generation, high-speed interconnect technology developed by Juniper Networks, a leading provider of networking solutions. It is designed to enable the creation of ultra-high-speed, low-latency networks that can support a wide range of applications, from high-performance computing and data analytics to cloud services and virtualization. Are you configuring on a single core chassis