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Cisco SCE 2000 4xGBE Installation and Configuration Guide
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Chapter 3 Information About Topology
Information About Topology Considerations
Information About Topology Considerations
There are several issues that must be considered in order to arrive at the optimum configuration of the
topology-related parameters:
•
Functionality — Will the system be used solely to monitor traffic flow, with report functionality
only, or will it be used for traffic flow control, with enforcement as well as report functionality?
•
Number of links — The SCE 2000 may be connected to one or two GBE links. This is relevant for
both Inline and Receive-Only topologies.
•
Redundancy — Must the system be designed to guarantee uninterrupted SCE 2000 functionality?
If so, there must be a backup SCE 2000 platform to assume operation in case of failure of the
primary device.
•
Link continuity — How should the SCE 2000 respond to platform failure with regard to link
continuity? Should traffic flow continue even though the unit is not operating, or be halted until the
platform is repaired/replaced?
These issues determine three important aspects of system deployment and configuration:
•
How many SCE 2000 platforms are needed and how will they be installed?
•
Physical topology of the system — The actual physical placement of the SCE 2000 in the system.
•
Topology-related configuration parameters — The correct values for each parameter must be
ascertained before configuring the system to make sure that the system will function in the desired
manner.
Functionality
The SCE 2000 can serve one of two general functions:
•
Monitoring and Control — The SCE 2000 monitors and controls traffic flow. Decisions are enforced
by the SCE 2000 depending on the results of the monitoring functions of the SCE 2000 and the
configuration of the Service Control Application for Broadband (SCA BB).
In order to perform control functions, the SCE 2000 must be physically installed as an inline
installation and the connection mode must be “inline”.
•
Monitoring only — The SCE 2000 monitors traffic flow, but cannot control it.
Either an inline installation or an optical splitter installation may be used for monitoring only. In the
latter case connection mode must be “receive-only”.
Number of links
The SCE 2000 can be deployed in a single GBE link or in two GBE links. The two-link topology may
implement load-sharing and the SCE 2000 in this case is able to process both directions of a
bi-directional flow even if they split to both links.
