Cisco SCE 1000 2xGBE Installation and Configuration Guide

This chapter describes the possible deployment topologies of the SCE 1000. The Cisco SCE solution offers several basic topology options that permit the user to tailor the SCE Platform to fit the needs of a particular installation. An understanding of the various issues and options is crucial to designing, deploying, and configuring the topology that best meets the requirements of the individual system.

The Cisco SCE solution offers several basic topology options that permit the user to tailor the SCE Platform to fit the needs of a particular installation. An understanding of the various issues and options is crucial to designing, deploying, and configuring the topology that best meets the requirements of the individual system.

• Information About Topology Considerations, page 3-1
• Functionality, page 3-3
• Information About Physical Installation, page 3-3
• Information About Redundancy, page 3-5
• Information About Failure and Recovery, page 3-6
• Information About Topology-Related Parameters, page 3-7

Information About Topology Considerations
There are several issues that must be considered 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?
• Physical installation configuration—Will the SCE Platform be installed as inline? Or will the SCE Platform use an optical splitter?
• Redundancy—Must the system be designed to guarantee uninterrupted service? If so, there must be a backup SCE Platform to assume operation in case of failure of the primary data link.
• Link failure and recovery—How should the SCE Platform respond to platform failure and subsequent recovery? Should traffic flow continue even though the unit is not operating, or be halted until the platform is repaired/replaced? Should the unit actually resume operation when it is again operational?

SCE Platform Configuration
There are four topology-related parameters:

• Connection mode—Can be Inline or Receive-only, depending on the physical installation of the SCE 1000:
  May be configured via either the setup command or the connection-mode command.
• Bypass mode when the SCE 1000 is not operational (on-failure)—This parameter determines whether the system cuts the traffic or bypasses it when the SCE 1000 has failed.
  May be configured via either the setup command or the connection-mode command.
• Status after reboot caused by fatal error or abnormal shutdown—This parameter determines whether the SCE 1000 returns to normal operational state after a failure.
  May be configured via either the setup command or the failure-recovery operation-mode command.
• Link failure reflection—This parameter determines the behavior of the system when there is a link problem. In some topologies it is required that link failure on one port be reflected to the other port, to allow the higher layer redundancy protocol in the network to function correctly.
  May be configured via the link failure-reflection command only.

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