About this Document

This document focusses on 5G xHaul network reference design with seamless segment routing using ACX710 and ACX5448 Universal Metro Routers in the role of cell site Access Node (AN); ACX5448 as Pre-Aggregation (AG1); MX204 Universal Router as Aggregation (AG2); MX10003 and MX480 Universal Routers as Aggregation (AG3); PTX1000 Router and MX10003 Universal Router as Core Routers (CR) and MX10003 Universal Router as a Services Aggregation Gateway (SAG) router.

The seamless segment routing solution is designed to provide resilient fast failover and low latency to meet 5G network requirements and deliver cohesive end-to-end solutions across domains boundaries. This solution leverages the xHaul architecture and implementation guidance described in the Open radio access network (O-RAN) Alliance technical specification [ORAN-WG9.XPSAAS.0-v00.01] for transport network domain. The advent of 5G technologies requires transport networks to support resilient multidimensional and border agnostic architectures. This JVD incorporates use cases and requirements in Metro mobile Backhaul and 5G initiatives.

The foundational technologies of the 5G xHaul JVD incorporate current and legacy VPN services over segment routing. Interdomain decoupling of transport and service layers is accomplished by leveraging seamless segment routing with BGP Labeled Unicast (BGP-LU) and Prefix-SID. Network pre-slicing concepts using Flexible Algorithm and BGP Classful Transport (BGP-CT) create new layers of network abstraction and provide capabilities to support end-to-end service level agreements (SLA) requirements. A key focus of this solution is the ability to color-map individual overlay services, enabling granular support of 4G and 5G applications over xHaul infrastructure.

Summary of the platforms for 5G xHaul seamless segment routing solution is as follows:

Solution	AN	AG1	AG2	AG3	CR	SAG
5G xHaul Seamless Segment Routing	ACX710 ACX5448	ACX5448	MX204	MX480/MX10003	PTX1000 and MX10003	MX10003