Understanding Pseudowire Redundancy Mobile Backhaul Scenarios; Sample Topology - Juniper ACX1000 Configuration Manual

Understanding Pseudowire Redundancy Mobile Backhaul Scenarios

Sample Topology

Copyright © 2017, Juniper Networks, Inc.
With the rising demand for mobile broadband services, telecommunication providers are
seeing a sharp increase in bandwidth requirements. To keep pace with demand, operators
are deploying packet-based backhaul networks that offer increased capacity at a lower
cost, while providing the necessary service reliability and quality of experience that users
expect.
Most of the legacy backhaul infrastructure has been traditionally built over PDH
microwave, TDM T1/E1, or ATM-over-DSL links. Service providers have traditionally added
subsequent TDM links to their base stations when needed to deal with bandwidth
constraint scenarios. This expansion model has proven to be inefficient for the
unprecedented traffic demands required by 3G and Long Term Evolution (LTE) services.
As a direct consequence, operators are gradually migrating to an Ethernet-based higher
capacity infrastructure in the backhaul portion of 3G and LTE topologies. Modern base
stations now provide Ethernet backhaul connectivity, allowing pseudowire technologies
to transport end-user content to the desired destination. As part of this Ethernet transition,
service providers are increasingly demanding better resiliency mechanisms to cover the
existence gap with those features provided by previous legacy technologies. With that
goal in mind, Junos OS provides efficient pseudowire redundancy capabilities to those
topologies where Layer 2 and Layer 3 segments are interconnected.
Sample Topology on page 623
Benefits of Pseudowire Redundancy Mobile Backhaul on page 624
Layer 2 Virtual Circuit Status TLV Extension on page 624
How It Works on page 625
Figure 31 on page 623 shows a sample topology.
Figure 31: Pseudowire Redundancy Mobile Backhaul Sample Topology
An
A1
Metro MPLS
ring
A2
A3
Layer 2 domain
Chapter 20: Configuring MPLS and Pseudowires
A5
PE1
Core MPLS
cloud
PE2
A4
CE2
PE3
PE4
CE3
Layer 3 domain
623