1-2 T-Series Traffic Director Installation, Configuration and Administration Guide
Chapter 1 Introduction
• “Product Capabilities” on page 1-4
• “Hardware Overview” on page 1-8
• “Common Hardware Features” on page 1-11
Traffic Director Architecture
The primary purpose of the Bytemobile T1000 Traffic Director is to provide L4 load
balancing across multiple, parallel traffic-processing blades, such as OSNs in a Bytemobile
Unison deployment. See Figure 1-2.
Figure 1-2 Architecture of Typical Unison Deployment with T1000
The Unison platform is typically placed inline within a carrier's network, with subscriber
traffic being processed only by the OSNs (CSMs are responsible for management and
control plane traffic). Each OSN has two interfaces on the data plane for redundancy.
Subscriber-side and Internet-side traffic will be handled on separate VLANs.
The T1000 performs firewall load balancing (FWLB)
1
, to transparently load balance data
plane traffic across OSNs in the direction of the Internet. Traffic passes through the OSNs
and transparently maintains its Layer 3 information. The T1000 exposes a single IP address
1. The T1000 also supports server load balancing for deployments where the Unison platform is not
operating in a transparent mode (for example, as a WAP Gateway or with a NonInline architecture
that employs optimization clients).
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