Cisco Systems SCE 2000 4xGBE manual Single Link Inline Topology, Dual link Inline Installation

Chapter 3 Topology

Physical Topologies

Single Link: Inline Topology

Typically, the SCE 2000 is connected in a full duplex GBE link between two devices (Router, BRAS, etc.). When the SCE 2000 is installed as a bump-in-the-wire, it physically resides on the data link between the subscribers and the network.

Figure 3-2: Single SCE Platform Single Link: In-line Topology

When configuring the SCE 2000, a bump-in-the-wire installation is referred to as “inline” connection mode.

Dual link: Inline Installation

In this topology, one SCE 2000 is connected inline in two full duplex, GBE links.

In case the two links are load-shared, asymmetrical routing might occur, and some of the flows may be split, i.e. the upstream packets of the flow go on one link, and the downstream packets go on the other link.

When installed in this topology, the SCE 2000 completely overcomes this phenomenon, and provides its normal functionality as if asymmetrical routing were not occurring in the two links.

Figure 3-3: Single SCE Platform Dual Link Inline Topology

This topology supports both monitoring and control functionality, and is referred to as “inline” connection mode.

SCE 2000 4xGBE Installation and Configuration Guide

OL-7824-02 3-5