Functionality; Number Of Links; Redundancy; Information About Link Continuity - Cisco SFE2000P Installation And Configuration Manual

Information About Topology Considerations
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These issues determine three important aspects of system deployment and configuration:
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Functionality

The SCE 2000 can serve one of two general functions:
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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.

Redundancy

When a high degree of reliability is desired, a second SCE 2000 Platform should be installed to provide
backup operation capabilities. The combination of two SCE 2000 s guarantees uninterrupted
functioning in case of a failure of one of the platforms. The two SCE 2000 s are cascaded, so that,
although all processing is performed only in the active SCE 2000 , the standby SCE 2000 is constantly
updated with all the necessary information so that it can instantly take over processing the traffic on the
data links should the active SCE 2000 fail.
If only preservation of the network links is required, and uninterrupted functionality of the SCE 2000
is not required, a single SCE 2000 is sufficient.

Information About Link Continuity

The bypass mechanism of the SCE 2000 allows traffic to continue to flow, if desired, even if the device
itself is not functioning.
Cisco SCE 2000 4xGBE Installation and Configuration Guide
3-2
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?
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.
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 or Mobile solution.
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".
Chapter 3 Information About Topology
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