Chapter 3

Topology

Topology Considerations

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.

Note that when the SCE 2000 is connected to the network through an optical splitter, a failure of the SCE 2000 does not affect the traffic flow, as the traffic continues to flow through the optical splitter.

Bypass Mechanism

The SCE 2000 includes a Network Interface Card with a bypass mechanism that is enabled upon SCE 2000 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.

Forwarding: This is the normal operational mode, in which the SCE 2000 processes the traffic for monitoring and control purposes.

Sniffing: The bypass mechanism preserves the network link, while in parallel allowing the SCE 2000 to process the traffic for monitoring only.

Cutoff: There is no forwarding of traffic, and the physical link is forced down (cutoff functionality at layer 1).

Maintaining the Network Links vs Maintaining SCE 2000 Platform Functionality

When a single SCE 2000 is deployed, the user may decide that in case of a failure, maintaining the network link is more important than providing the SCE 2000 functionality. In this scenario, when the SCE 2000 detects a failure that requires a reboot process for recovering, it immediately switches to Bypass mode, allowing all traffic to bypass the SCE 2000. The SCE 2000 stays in Bypass mode maintaining the network link, albeit without SCE 2000 processing, until the SCE 2000 fully recovers from the failure and is ready to resume normal functioning.

Alternatively, the user may decide that the SCE 2000 functionality is sufficiently crucial to require severing the link if the SCE 2000 platform fails. In this case, when the SCE 2000 detects a failure that requires a reboot process for recovering, it immediately switches to Cutoff mode, stopping all traffic flow. The SCE 2000 stays in Cutoff mode, halting all traffic, until it fully recovers from the failure and is ready to resume normal functioning. In Cutoff the physical interface is blocked, enabling the network device connected to the SCE 2000 to sense that the link is down.

SCE 2000 4xGBE Installation and Configuration Guide

 

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Cisco Systems SCE 2000 4xGBE manual Link Continuity, Bypass Mechanism

SCE 2000 4xGBE specifications

The Cisco Systems SCE 2000 4xGBE is a robust solution designed to optimize IP networks and enhance service delivery. As a member of Cisco's Service Control Engine (SCE) product line, this device is particularly suited for service providers looking to manage network traffic, improve service quality, and provide a suite of advanced management features.

One of the standout features of the SCE 2000 is its ability to process and analyze network traffic in real-time. This capability allows operators to gain insights into user behavior, application usage, and overall network performance. By utilizing deep packet inspection technology, the SCE 2000 can identify different types of traffic, enabling network managers to enforce policies and prioritize critical applications effectively.

In terms of interface capabilities, the SCE 2000 offers four 1 Gigabit Ethernet (GbE) ports. This versatility allows for easy integration into existing network infrastructure while ensuring ample bandwidth for data transfer. The device supports both IPv4 and IPv6 protocols, making it future-proof and suitable for evolving network demands.

One of the significant technologies employed by the SCE 2000 is Service Level Agreement (SLA) management. This feature ensures that service providers can meet their commitments to customers by monitoring performance metrics such as latency, jitter, and packet loss. The ability to generate reports based on SLA compliance allows for better customer engagement and transparency.

Additionally, the SCE 2000 facilitates dynamic resource allocation, enabling service providers to adapt network resources based on current demand. This elasticity is crucial in managing peak loads and ensuring a seamless user experience. Furthermore, the device’s support for Quality of Service (QoS) policies ensures that critical applications receive the necessary bandwidth and resources dedicated to maintaining operational efficiency.

The SCE 2000 also emphasizes security with features such as intrusion detection and prevention capabilities, helping protect the integrity of the network. This combination of performance monitoring, traffic management, and security makes the SCE 2000 an invaluable tool for service providers.

In conclusion, the Cisco Systems SCE 2000 4xGBE is a powerful network management solution that excels in providing real-time traffic management, SLA compliance, and security features. Its capabilities make it an essential component for service providers aiming to optimize their networks while delivering high-quality services to their customers.