Chapter 3

Topology

Issues to Be Considered

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-modecommand.

•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-modecommand.

•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-recoveryoperation-modecommand.

•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-reflectioncommand only.

Failure Detection Mechanism

The SCE 1000 contains various mechanisms to monitor the status and to detect failures. The main mechanisms are:

•Boot time diagnostics failure. When there is a failure in diagnostics testing at boot time the system will remain in failure status.

•Watchdog mechanism. There are two types of watchdogs:

•HW watchdog. A hardware mechanism that detects control entity failure.

•SW watchdog. A software mechanism that periodically checks for software failures in the SCE 1000. If a failure is detected, an error massage is sent and the SCE 1000 reboots.

•Run time hardware tests. The system periodically tests the hardware components for error. If a hardware component is malfunctioning, it will be discovered by the system within seconds.

Bypass Mechanism

The SCE 1000 includes a Network Interface Card with a bypass mechanism that is enabled upon SCE 1000 failure. In addition, when connected in-line it can also be enabled in normal operation to simultaneously bypass traffic flow to the other side and direct it internally for analysis. In this case it maintains "receive-only"-like monitoring functions, when control functionality is not required.

The bypass card supports the following four modes:

•Bypass — The bypass mechanism preserves the network link, but traffic is not processed for monitoring or for control.

Cisco SCE 1000 2xGBE Installation and Configuration Guide

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Cisco Systems OL-7821-04, SCE 1000 2xGBE manual SCE Platform Configuration, Failure Detection Mechanism, Bypass Mechanism
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SCE 1000 2xGBE, OL-7821-04 specifications

Cisco Systems OL-7821-04, SCE 1000 2xGBE is an advanced network service appliance designed to deliver superior performance and reliability for service providers seeking to optimize their networks. This compact yet powerful device is integral in addressing the growing demands of data traffic in telecommunications and data centers.

One of the standout features of the SCE 1000 is its ability to support both IPv4 and IPv6 networks, ensuring compatibility with current and future networking protocols. This dual-stack capability empowers service providers to seamlessly transition and integrate next-generation applications without jeopardizing service quality.

The SCE 1000 is equipped with two Gigabit Ethernet (GbE) ports that enhance its connectivity options and allow for increased bandwidth. This dual-port configuration supports high-speed data transfers and streamlined operations, making it ideal for enterprises with substantial networking demands. Its flexible interface options facilitate easy integration into existing network architectures without requiring extensive reconfiguration.

An essential characteristic of the SCE 1000 is its advanced service creation technology, which allows for dynamic traffic management. This feature intelligently prioritizes and optimizes applications, ensuring that critical services receive the bandwidth they need while maintaining overall network efficiency. Service providers can leverage this capability to implement Quality of Service (QoS) policies, delivering a consistent user experience even during peak usage times.

Furthermore, the SCE 1000 supports various traffic engineering methods, including deep packet inspection and application recognition, enabling operators to monitor and control network traffic effectively. This capability is particularly crucial in identifying and mitigating potential network threats, resulting in enhanced security measures.

With its robust architecture, the device also offers scalability, accommodating the growing network requirements of service providers. As businesses grow and data use expands, the SCE 1000 can adapt without compromising performance.

In summary, the Cisco Systems OL-7821-04, SCE 1000 2xGBE is a versatile network service appliance that combines high performance, advanced service creation technology, and strong security features. It stands out as an essential tool for service providers aiming to enhance their network capabilities and deliver superior services to customers. Its dual GbE ports, IPv4/IPv6 support, and dynamic traffic management make it a reliable choice for organizations anticipating significant data growth.
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