Juniper Routing Engine – RE-MX104

Juniper Routing Engine for MX104 Universal Edge Router

The Juniper RE-MX104 is the Routing Engine module for the Juniper MX104 Universal Edge Router, providing the control plane processing, Junos OS execution, and management functions that direct all forwarding, routing protocol operations, and system management for MX104 deployments in service provider and enterprise WAN edge environments.

Key Features

• Dedicated Routing Engine for Juniper MX104 — provides full control plane and management functions
• Runs Junos OS for consistent routing protocol support across the Juniper MX platform
• Supports full BGP, OSPF, IS-IS, MPLS, and advanced routing protocol tables
• Redundant RE support for hitless failover and non-stop routing (NSR) on MX104
• Juniper-genuine replacement or spare RE for MX104 service provider edge deployments

Product Specifications

• Part Number: RE-MX104
• Manufacturer: Juniper Networks
• Component Type: Routing Engine
• Compatible System: Juniper MX104 Universal Edge Router
• OS: Junos OS
• Role: Control plane, routing protocol processing, system management
• Redundancy: Supports dual-RE for NSR and GRES

Component Specifications

• Routing Table: Supports full Internet routing table (1M+ routes)
• Protocols: BGP, OSPF v2/v3, IS-IS, RSVP, LDP, MPLS, BFD
• Management: Console, out-of-band Ethernet management port
• Storage: Compact flash for Junos OS and configuration
• High Availability: NSR (Non-Stop Routing), GRES (Graceful Routing Engine Switchover)

Use Cases

• Replacement or spare Routing Engine for Juniper MX104 in service provider edge deployments
• Dual-RE configuration for MX104 high availability with non-stop routing
• Upgrading MX104 control plane for improved routing table scale or management capability
• Spare RE stocking for MX104 deployments with stringent uptime and SLA requirements

Compatibility

• Juniper MX104 Universal Edge Router only
• Not compatible with MX80, MX240, MX480, or MX960 (each MX model uses platform-specific REs)
• Managed via Junos OS CLI, NETCONF, and Juniper Paragon Automation
• Verify MX104 Junos OS version compatibility with RE-MX104 hardware revision before installation

Frequently Asked Questions

What is the difference between a Routing Engine and a line card in Juniper MX routers?

The Routing Engine handles control plane functions — running Junos OS, executing routing protocols, and managing the system — while line cards handle data plane forwarding of actual traffic. The RE-MX104 is the control plane component; MX104 line cards handle packet forwarding independently.

Does the MX104 support dual Routing Engines for redundancy?

Yes — the MX104 supports dual Routing Engines for high availability. With two RE-MX104 modules installed, GRES (Graceful Routing Engine Switchover) and NSR (Non-Stop Routing) enable sub-second failover without disrupting established routing protocol sessions or forwarding state.

Can the RE-MX104 hold a full Internet BGP routing table?

Yes — the RE-MX104 is designed for service provider edge deployments and supports a full Internet routing table exceeding 1 million routes, making it suitable for full-table BGP peering with upstream transit providers.

The Juniper RE-MX104 is the essential control plane component for MX104 Universal Edge Router deployments — delivering Junos OS routing protocol depth, full Internet table scale, and dual-RE high availability capability that service provider and enterprise WAN edge environments depend on for continuous, resilient edge routing operations.