Cisco Catalyst 3750 Metro Switch DC Power Supply (spare) PWR-ME3750-DC= Fiche De Données
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Data Sheet
© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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cannot see traffic outside of that VPN. Traffic separation occurs without tunneling or encryption
because it is built directly into the network.
Utmost SLA Support Using Traffic Shaping and Bidirectional Hierarchical Quality of Service
(Through Enhanced Services Ports)
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-