Segment Routing
Segment routing (SR) is a source-based routing technique that simplifies traffic engineering and management across network domains. It removes network state information from transit routers and nodes in the network and places the path state information into packet headers at an ingress node.
Segment Routing Overview
To understand segment routing, you must first understand its fundamental components.
SR Domain: A collection of nodes that participate in SR protocols. Within an SR domain, a node can execute ingress, transit, or egress procedures.
SR Path: An ordered list of segments that connects an SR ingress node to an SR egress node. Typically, it follows the least-cost path from ingress to egress.
SR Segment: A forwarding instruction that causes a packet to traverse a section of the network topology. SR defines many SR segment types, and the two used most often are adjacency and prefix segments. An adjacency segment is a strict forwarded single-hop tunnel. It causes a packet to traverse a specified link associated with an interior gateway protocol (IGP) adjacency between two nodes, irrespective of the link cost. A prefix segment is a multihop tunnel that uses equal cost multihop-aware shortest path links to reach a prefix.
What is segment routing?
Segment routing simplifies operations and reduces resource requirements in the network by removing network state information from intermediate routers and placing path information into packet headers at the ingress node.
When you use Juniper segment routing, you won’t have to swap out your network hardware as you transition. That’s because we design our equipment using high-performance programmable ASICs. The high performance of Juniper ASICs enables you to build out your segment-routing environment on your existing Juniper hardware with industry-leading scalability while continuing to use the same, consistent Junos operating system you already rely on.
Juniper uniquely allows you to design, manage, and concurrently support multiple network types as you introduce segment routing into your environment. With our Paragon Pathfinder, you can run multiple control planes at the same time: segment routing over MPLS (SR-MPLS), Label Distribution Protocol (LDP), Resource Reservation Protocol (RSVP) and native IP.
Products
Juniper Paragon Pathfinder
MX Series Universal Routing Platforms
Juniper Paragon Pathfinder
Powerful and flexible traffic engineering software simplifies and automates provisioning, management, and monitoring of Segment Routing and IP/MPLS flows across large networks.
Juniper Paragon Planner
MX Series Universal Routing Platforms
Juniper Paragon Pathfinder
Network planning and simulation software lets you optimize network usage without impacting network performance.
MX Series Universal Routing Platforms
MX Series Universal Routing Platforms
MX Series Universal Routing Platforms
With a robust portfolio of SDN-enabled routers, the MX Series provides industry-leading system capacity, density, security, and performance with unparalleled longevity.
PTX Series Routers
PTX Series Routers
MX Series Universal Routing Platforms
Forming the foundation of core routing architectures, PTX Packet Transport Routers provide ultra-high power efficiency, scale, and performance for 100G and 400G architectures. Designed for the unexpected and optimized for WAN core and data center use cases, the PTX Series routers offer forward-looking architectures built to last.
ACX Series Routers
PTX Series Routers
ACX Series Routers
High-performance ACX Series Routers serve metro access, aggregation, and data center use cases. They are energy-efficient, CE 3.0 compliant, and support 5G high-precision timing and synchronization.
Network Automation
PTX Series Routers
ACX Series Routers
Juniper’s automation-led approach to networking simplifies and accelerates WAN and data center planning, design, and operations for more reliable and sustainable network services.
HEADNET - Copyright © 2025
