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Cisco Systems, Inc.

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Figure 5

Cisco Catalyst 3550-12G and 3550-12T Intelligent Ethernet Switches

Intelligence at the Metro Access Edge: Enabling Profitable Ethernet Services

Service providers are facing signiﬁcant challenges in meeting the service needs of their enterprise and small and

medium-sized business (SMB) market customers. As they continue to put more and more mission-critical

applications on their networks, these customers are demanding high bandwidth at speeds greater than T1/E1 and at

competitive prices. Enterprise and SMB customers have experienced the speed and cost beneﬁts of Ethernet in their

LANs and want to extend these beneﬁts into the wide-area and metro-area networks (WAN and MAN). However,

in today’s economic environment, service providers face several challenges as they look to meet the service needs of

their customers. Such challenges include:

• Providing proﬁtable new services while reducing operational and capital costs

• Meeting variable bandwidth demand at speeds greater than T1/E1

• Effectively integrating existing WAN services such as Frame Relay and Asynchronous Transfer Mode (ATM)

• Building cost-effective, highly available, scalable metro Ethernet networks

These challenges are especially evident at the metro access edge. As service providers look to provide proﬁtable

Ethernet services such as Layer 2 virtual private networks (Layer 2 VPNs) or business Internet access, Cisco

intelligent functionality such as 802.1Q tunneling, advanced quality of service (QoS), and granular rate-limiting, is

essentialin the serviceprovider’scustomerlocatedequipment. In addition,with intelligent features suchas subsecond

STP convergence and CWDM GBIC support, Cisco Catalyst 3550 Series switches provide the necessary network

availability and scalability at the access edge. With Cisco Catalyst 3550 Series Intelligent Ethernet switches, Cisco

delivers the optimal balance of performance, cost-effectiveness, and intelligence, enabling proﬁtable Ethernet service

breadth, availability, security, and manageability.

Most important, the Cisco Catalyst 3550 Series is a key component of the Cisco Metro Ethernet Switching portfolio.

For regional metro, metro aggregation and metro access, Cisco Metro Ethernet Switching enables service providers

to deliver proﬁtable, comprehensive Ethernet services. With the effective integration of existing WAN services, such

as Frame Relay and ATM, Cisco Metro Ethernet Switching offers an unmatched breadth of service delivery

mechanisms. With its extensive automated operations support, Cisco also helps service providers minimize total cost

of ownership for new services. Through technology leadership, ﬁnancial stability, and a commitment to customer

support, Cisco ensures service success from “start-to-scale.”

Service Breadth through 802.1Q Tunneling, Advanced Quality of Service, and Rate-limiting

The Cisco Catalyst 3550, with its 802.1Q tunneling capability, enables service providers to create Layer 2

transparent LAN services (TLS) with a clear separation of their network from enterprise and SMB customer

networks. Using a 802.1Q tunneling implementation, service provider VLAN information (802.1Q tag) is added to

the customer’s original 802.1Q-tagged packets as the packets come into the service provider network. The service

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