Cisco ME-C3750-24TE-M Bedienungsanleitung PDF herunterladen (Seite 4)

The ability to apply QoS criteria to network traffic is essential for service provider networks. As enterprises and

service providers continue the shift to a single, converged network carrying mission-critical applications over a

unified multiservice (data, voice, and video) architecture, the ability to manage traffic flows and delivery terms

becomes increasingly critical. As enterprises outsource their network services to service providers, they will turn to

providers who have the ability to supply QoS features to help ensure that on-demand, bandwidth-intensive

applications and time-sensitive, information-delivery applications receive the bandwidth necessary to maintain

performance. The ability to apply QoS to customer traffic will become vital to meeting SLAs and maintaining

network performance. Support for advanced QoS features will also allow service providers to create premium

products and service bundles. In addition, efficient application of QoS techniques reduces overall Metro Ethernet

service costs through more efficient use of network links.

Cisco Catalyst 3750 Metro Series QoS technology facilitates the management of network performance with

respect to bandwidth, delay, jitter, and packet loss, which are critical to optimizing application performance and

meeting SLAs. The switch supports the Cisco Hierarchical Queuing Framework (HQF), which includes traffic

classification, two-rate three-color policing, Class-Based Weighted Fair Queuing (CBWFQ), Low-Latency Queuing

(LLQ), and traffic shaping on the output of the enhanced services ports. The hierarchical implementation of this

framework enables service providers to manage their QoS at three different levels: at the physical interface level

(enhanced services ports), the VLAN level (VLANs within each port), and marked class level (classes with each

VLAN), providing the most granularity and flexibility to deliver their SLAs. In addition, congestion avoidance

techniques such as Weighted Random Early Detection (WRED) and tail drop are supported to better regulate

network traffic and prevent congestion.

Adding Differentiated Services over Time

Many service providers start their Metro Ethernet service portfolios by offering basic Layer 2 or Layer 3 services.

As the services grow in popularity among enterprise and commercial customers and the competitive service

offerings become more commonplace, it is essential that service providers broaden their service portfolios by

adding more differentiated services. By providing several optional software licenses with enhanced features, Cisco

Catalyst 3750 Metro Series Switches enable service providers to build an intelligent network without having to

incur a high initial capital expenditure (CapEx). Service providers can begin selling their Metro Ethernet services

with basic features and SLAs. As their services become more profitable, they can gradually increase the service

offerings by purchasing the software licenses with additional features, without the need to do costly complete

equipment upgrades.

With the flexibility and scalable architecture of the Cisco Catalyst 3750 Metro Series, service providers can build a

more future-proof Metro Ethernet network, and, as their Metro Ethernet services evolve, the network can be

upgraded without replacing the metro access equipment.

Multiple Software Feature Images to Provide Flexible Deployment Options

The Cisco Catalyst 3750 Metro Series Switches offer three different Cisco IOS

Software feature images,

METROBASE, METROACCESS, and METROIPACCESS, providing cost-effective, pay-as-you-grow service

upgrade options for service providers deploying multiple services. The service providers do not have to pay for the

features they do not need today and still have the option in the future to receive those features with a simple

software upgrade.

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Cisco ME-C3750-24TE-M Bedienungsanleitung Seite 4