Cisco Catalyst 3550, Catalyst 3550-24, Catalyst 3550-48, Catalyst 3550 Series Datasheet

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Cisco Catalyst 3550 Series

Intelligent Ethernet Switches for Metro Access

Data Sheet

Product Overview

The Cisco Catalyst®3550 Series Intelligent Ethernet switches is a line of powerful, ﬁxed-conﬁgurationmultilayerswitchesthat extendintelligence to themetro accessedge, enabling service breadth, availability, security,andmanageability .Keycomponents of the Cisco Metro Ethernet Switching portfolio,theseswitches are idealforservice providers looking to deliver proﬁtable Ethernet services while minimizing total cost of ownership. With a range of Fast Ethernet, Gigabit Ethernet, DC power, and ﬁber conﬁgurations, the Cisco Catalyst 3550 Series is the ideal metro access switch for enterprise and small and medium-sized business markets. Featuring 802.1Q tunneling, high-performance IP routing, and subsecond Spanning-Tree Protocol (STP) convergence, this line of powerful, yet cost-effective, ﬁxed-conﬁguration switches enable a variety of metro services, such as transparent LAN services and business-class Internet access.

The Cisco Catalyst 3550 Series Intelligent Ethernet switches include the following conﬁgurations:

• Cisco Catalyst 3550-24 Switch— 24 10/100portsand 2 Gigabit Interface Converter (GBIC)-based Gigabit Ethernet ports; 1 rack unit (RU)

• Cisco Catalyst 3550-24-DC Switch— 24 10/100 ports and 2 gigabit interface converter (GBIC)-based Gigabit Ethernet ports; 1 RU DC-powered

• Cisco Catalyst 3550-24-FX Switch— 24 100FX multimode ﬁber ports and 2 GBIC-based Gigabit Ethernet ports; 1 RU

• Cisco Catalyst 3550-48 Switch— 48 10/100 ports and 2 GBIC-based Gigabit Ethernet ports; 1 RU

• Cisco Catalyst 3550-12G Switch— 10 GBIC-based Gigabit Ethernet ports and 2 10/100/1000BaseT ports; 1.5 RU

• Cisco Catalyst 3550-12T Switch— 10 10/100/1000BaseT ports and 2 GBIC-based Gigabit Ethernet ports; 1.5 RU

The built-in Gigabit Ethernet ports accommodatea rangeof GBICtransceivers, including the Cisco Course Wave Division Multiplexing (CWDM) GBIC Solution,

GigaStack 1000BaseSX, 1000BaseLX/LH, and 1000BaseZX GBICs. High levels of resiliency can also be implemented by deploying dual redundant Gigabit Ethernet uplinks, UplinkFast and Per-VLAN SpanningTree Plus(PVST+) for uplinkload balancing. This Gigabit Ethernet ﬂexibility makes the Cisco Catalyst 3550 Series switches an ideal metro access edge complement to the Cisco 7600 Series Internet Router and Cisco Catalyst 6500 Series of metro Ethernet switches.

GBIC, 1000BaseT,

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Included with the Cisco Catalyst 3550-24, 3550-24-DC, 3550-24-FX and 3550-48 are the Standard Multilayer Software Image (SMI) or the Enhanced Multilayer Software Image (EMI). The SMI feature set includes advanced QoS, rate-limiting, access control lists (ACLs), and basic state and RIP routing functionality. The EMI provides a richer set of features including advanced hardware-based IP unicast and multicast routing and the Web Cache Communication Protocol (WCCP). After initial deployment, the Enhanced Multilayer Software Image Upgrade Kit gives userstheﬂexibility to upgrade to the EMI.TheCisco Catalyst 3550-12T and 3550-12G areonlyavailable with the EMI.

Figure 1

Cisco Catalyst 3550-24 Intelligent Ethernet Switch

Figure 2

Cisco Catalyst 3550-24-DC Intelligent Ethernet Switch

Figure 3

Cisco Catalyst 3550-24-FX Intelligent Ethernet Switch

Figure 4

Cisco Catalyst 3550-48 Intelligent Ethernet Switch

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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 essentialinthe serviceprovider’s customerlocated equipment. Inaddition, with intelligentfeatures such assubsecond 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,theCiscoCatalyst 3550 Series is a key componentofthe 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. Withits extensive automated operations support, Cisco also helps serviceprovidersminimize 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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provider 802.1Q tag is removed when the packets exit their network, leaving the original packets untouched. Other Layer 2 protocols such as STP, VLAN Trunk Protocol (VTP), and Cisco Discovery Protocol will also be tunneled through theservice provider’snetwork. The 802.1Q tunnelingfeature enables service providerstouse a single VLAN (up to 4096 VLAN IDs) to support customers who have multiple VLANs. In addition, the feature preserves customers’ original VLAN IDs and segregates trafﬁc from different customers within the service provider infrastructure even when those customers use the same VLAN IDs. As a result, enterprise customers subscribing to TLS cantransparentlysend and receive trafﬁc from othermetrosites through the service provider networkasthough the sites were within the same corporate LAN.

In addition to Layer 2 VPN services, Multi-VRF CE (Virtual Routing Forwarding Customer Edge, also called VRF-lite) and Border Gateway Protocol (BGP) on the Cisco Catalyst 3550 will enable thecreationofaLayer3VPN service by keeping separate routing tables for each VPN customer. Multi-VRF CE is a feature that allows a service provider to support two or more VPNs on a single 3550 switch, where IP addresses can be overlapped among the VPNs. Multi-VRF CE uses input interfaces to distinguish routes for different VPNs and forms virtual packet-forwarding tables by associating one or more Layer 3 interfaces with each VRF. Interfaces in a VRF can be either physical, such as Ethernet ports, or logical, such as VLAN SVIs, but an interface cannot belong to more than one VRF at any time.

The Cisco Catalyst 3550 offers superior Layer 3 granular QoS features to enable service providers to provide highquality services with service-level agreements (SLAs). The QoS features ensure that network trafﬁc is classiﬁed, prioritized, and congestion is avoided in the most efﬁcient manner possible. The Cisco Catalyst 3550 can classify, reclassify, police, andmark the incoming packets beforethe packet is placed inthe shared buffer. Packet classiﬁcation allows the network elements to discriminate between various trafﬁc ﬂows and enforce policies based on Layer 2 and Layer 3 QoS ﬁelds.

To implement QoS, ﬁrst, the Cisco Catalyst 3550 switches identify trafﬁc ﬂows, or packet groups, and classify or reclassify these groups using either the Differentiated Services Code Point (DSCP) ﬁeld or the 802.1p class-of-service (CoS) ﬁeld, or both. Classiﬁcation and reclassiﬁcation can be based on criteria as speciﬁc as the source/destination IP address, source/destination Media Access Control (MAC) address, or the Layer 4 Transmission Control Protocol/ User Datagram Protocol (TCP/UDP) port. At the ingress, the Cisco Catalyst 3550 can also perform policing and marking of the packet. To ensure proper policing and marking on a per packet basis, control plane and data plane access control lists (ACLs) are supported on all ports.

After the packet goes through classiﬁcation, policing, and marking, it is assigned to the appropriate queue before exiting the switch. The Cisco Catalyst 3550 Series supports four egress queues per port, which allows the service provider to be more discriminating and speciﬁc in assigning priorities for the various applications. At egress, the switch performs scheduling and congestion control. Scheduling is an algorithm that determines the order in which the queues are processed. The switches support Weighted Round Robin (WRR) scheduling and strict priority queuing. The WRR queuing algorithmensuresthatthe lower-priority packets are not entirely starved forbandwidth and are serviced without compromising the priority settings administered by the service provider. Strict priority queuing ensuresthat the highest-priority packets will alwaysget serviced ﬁrst, ahead ofallother trafﬁc, which allows theotherthree queues to beserviced using WRR scheduling.Inconjunction with scheduling, theCisco Catalyst 3550 Series Gigabit Ethernet ports support congestion control via Weighted Random Early Detection (WRED). WRED avoids congestion by setting thresholds at which packets are dropped before congestion occurs.

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The Cisco Catalyst 3550 is capable of performing rate limiting via its support of the Cisco Committed Information Rate (CIR) functionality. Through CIR, bandwidth can be guaranteed in increments as low as 8 Kbps. Bandwidth can be allocated based on several criteria, including MAC source address, MAC destination address, IP source address, IP destination address, and TCP/UDP port number. Per-VLAN, per-port policing on the ingress is also supported. Each Cisco Catalyst 3550 Series 10/100 port supports eight aggregate or individual ingress policers and eight aggregate egress policers. Each Cisco Catalyst 3550 Series Gigabit Ethernet port supports 128 aggregate or individual ingress policers and 8 aggregate egress policers. This gives service providers the ﬂexibility to offer more granular services.

In addition,the Cisco Catalyst 3550Seriesalso supports hardware-based high-performanceIProuting, such as Open Shortest Path First (OSPF); Interior Gateway Routing Protocol (IGRP); Enhanced IGRP (EIRGP); Border Gateway Protocol (BGP); Routing Information Protocol (RIP) and RIP v2; Protocol-Independent Multicast (PIM); and hardware-based IGMP snooping for multicast applications. For voice over IP (VoIP),the Cisco Catalyst 3550 Series supports Auxiliary VLAN. Together with the superior QoS and rate-limiting features mentioned above, service providers can build a ﬂexible network with the Cisco Catalyst 3550 Series to provide voice, video, and high-speed data services from a single network architecture.

Service Availability through Resiliency Enhancements and Network Redundancy

The Cisco Catalyst 3550 Series provides a rich set of resiliency enhancement features to ensure quick fail-over recovery and create a high-availability network. The IEEE 802.1w Rapid Spanning Tree standard allows the service provider to achieve subsecond spanning tree convergence times to maximize network stability and reliability. The IEEE802.1sMultiple Spanning Treestandard can bedeployed in conjunction with802.1wto improve thescalability of the STP by grouping VLANs into spanning tree instances, as well as by providing backward compatibility to devices running the 802.1D STP.

In addition, service providers can enable Bridge Protocol Data Unit (BPDU) guard and Spanning Tree Root Guard (STRG) to enhance the reliability of their networks. BPDU guard allows the service provider to shut down STP PortFast-enabled interfaces to avoid receiving BPDUs from their customers’ networks. STRG prevents customer devices outside the service provider’s network from becoming STP root nodes.

The Cisco Catalyst 3550 Series enables the service provider to construct a highly redundant network. Per-VLAN Spanning Tree Plus (PVST+) allows the service provider to implement Layer 2 load-sharing on redundant links, efﬁciently utilizing the extra capacity inherent in a redundant design. For a Layer 3 network, Cisco Hot Standby Router Protocol (HSRP) creates redundant fail-safe routing topologies, and equal-cost routing provides Layer 3

load-balancing and redundancy. Service providers can also utilize EtherChannel

technology to aggregate up to 16 Gbps through Gigabit EtherChannel and up to 1.6 Gbps through Fast EtherChannel. The EtherChannel technology enhances fault tolerance and offers higher speed aggregated bandwidth between switches and to routers.

In addition to resiliency andnetworkredundancyadvantages, the Cisco Catalyst 3550 Series enables metro network scalability at the access edge through its support of the Cisco CWDM GBIC Solution. This solution allows service providers to scale their bandwidth without deploying additional ﬁber. The service provider can scale up to eight Gigabitsofbandwidth on apair of single-mode ﬁbersat distances upto120 km. Withthe support forCWDM GBICs on the Cisco Catalyst 3550 Series, service providers can aggregate multiple Cisco Catalyst 3550 switches to easily upgrade network bandwidth with existing ﬁber infrastructure.

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Metro network scalability isalsoenhancedby the Cisco Catalyst 3550 Series support of 4,096 VLAN IDs and 1,005 active VLANsperswitch. VLAN trunks can becreatedfrom any port using thestandards-based802.1Q or the Cisco Inter-Switch Link (ISL) VLAN trunking architecture.

Service Security through Access Control Lists and Enhanced Security Features

The Cisco Catalyst 3550 Series offers enhanced data security through the use of access control lists (ACLs). By denying packets based on source and destination MAC addresses, IP addresses, or TCP/UDP ports, users can be restricted from sensitive portions of the network. Also, because all ACL lookups are done in hardware, forwarding and routing performance is not compromised when implementing ACL-based security in the network. For superior security management, the Cisco Catalyst 3550 Series supports standard and extended ACLs on VLANs, Layer 3 interfaces, as well as Layer 2 interfaces.

Service providers can also implement higher levels of security by enabling private VLAN edge. This feature provides security and isolation between ports on a switch, ensuring that trafﬁc travels directly from its entry point to the aggregation devicethrougha virtual path and cannot be directed toadifferent port. Local Proxy Address Resolution Protocol (ARP) works in conjunction with private VLAN edge to minimize broadcasts and maximize available bandwidth.

Withthe Cisco Catalyst3550Series, service providerscan implement highlevelsof console security.Multilevelaccess security on the switch console and the Web-based management interface prevents unauthorized users from accessing or altering switch conﬁguration. Terminal Access Controller Access Control System (TACACS+) and Remote Authentication Dial-In User Service (RADIUS) authentication enable centralized access control of the switch and restricts unauthorized users from altering the conﬁguration.

Service providers are also able to enhance their network security by adding 802.1x port-based authentication for authenticating individual customers, DHCP Interface Tracker (Option 82) for relaying customer identiﬁcation (switch and port ID) to a DHCP server,andport security with MAC address aging for limiting the concurrent MAC addresses allowed per port.

Service Management through IE 2100 and SNMP

The Cisco Catalyst 3550 Series provides outstanding service management capabilities via Cisco IE 2100 Series Intelligence Engine support and SNMP. Service providers will be able to integrate the Cisco Catalyst 3550 Series seamlessly into their operations support systems (OSSs) and enable improved ﬂow-through provisioning.

The Cisco IE 2100 Series network device allows service providers to effectively manage a network of Cisco IOS

Software devices, including the Cisco Catalyst 3550 Series. It is a completely self-contained unit that includes a task-oriented Web graphic user interface (GUI), a programmable extensible markup language (XML) interface, conﬁguration template management, and an embedded repository. Network operators can use the Web GUI to quickly turn existing Cisco IOS CLI conﬁguration ﬁles into reusable templates. The Cisco IE 2100 Series integrates easily into existing customer OSSs or business support systems (BSSs) and provisioning systems via its external repository support and the event-based Cisco IOS XML interface that effectively “workﬂow-enables” Cisco device deployment.

Service providers also can manage the Cisco Catalyst 3550 Series using Simple Network Management Protocol (SNMP) version 2 and version 3, and the Telnet interface for comprehensive in-band management. A CLI-based management console provides detailed out-of-band management.

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A comprehensive set of Management Information Bases (MIBs) is provided for the service provider to collect trafﬁc information on the Cisco Catalyst 3550 Series for various billing methods.

Product Features and Benefits

Feature Benefit Service Breadth

Layer 2 and Layer 3 VPN services • 802.1Q tunneling expands VLAN space by using a VLAN-in-VLAN hierarchy,

and tagging the tagged packets. The 802.1Q tunneling feature enables service providers to use a single VLAN to support customers who have multiple VLANs, while preserving customer VLAN IDs and segregating trafﬁc from different customers within the service provider infrastructure even when they appear to be on the same VLAN.

• Multi-VRF CE (VRF-lite) forms virtual packet-forwarding tables by

associating one or more Layer 3 interfaces with each VRF, allowing the creation of multiple Layer 3 VPNs on a single Cisco Catalyst 3550 Series. Interfaces ina VRF could beeither physical, as in an Ethernet port,or logical, as in a VLAN switch virtual interface (SVI)—requires Enhanced Multilayer Software Image (EMI).

Voice and video services • Protocol-Independent Multicast (PIM) for IP multicast routing within a

network enables the network to receive the multicast feed requested and allows switches not participating in the multicast to be pruned—support for PIM sparse mode (PIM-SM), PIM dense mode (PIM-DM), and PIM sparse-dense mode—requires Enhanced Multilayer Software Image (EMI).

• Distance Vector Multicast Routing Protocol (DVMRP) tunneling for interconnecting two multicast-enabled networks across non-multicast networks—requires Enhanced Multilayer Software Image (EMI).

• IGMP ﬁlteringprovides control of theset of multicast groups towhich a user on a switch port can belong.

• Voice VLAN (auxiliary VLAN) support for VoIP application allows the creation of data and voice VLANs on the same physical port.

• Cisco Group Management Protocol (CGMP) server functionality enables a switch to serve as the CGMP router for CGMP client switches—requires Enhanced Multilayer Software Image (EMI).

• IGMP snooping allows fast client “joins” and “leaves” of multicast streams and limits bandwidth-intensive video trafﬁc to the requestors.

• Web Cache Communication Protocol (WCCP) enables integration of cache engines into the network infrastructure. The cache engines transparently store frequentlyaccessed content andthen locally fulﬁll successive requests for the same content, eliminating repetitive transmissions of identical content to web servers. Cache engines accelerate content delivery and ensure maximumscalability and availabilityof content. Ina service-provider network, WCCP and cache engine solution can be deployed at the points of presence (POPs)—requires Enhanced Multilayer Software Image (EMI).

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Feature Benefit

Advanced QoS • 802.1p CoS and DSCP ﬁeld classiﬁcation via marking and reclassiﬁcation on

a per-packet basis using source/destination IP address, source/destination MAC address, or Layer 4 TCP/UDP port number.

• Cisco control-plane and data-plane QoS ACLs on all ports to ensure proper marking on a per-packet basis.

• Four egress queues per port supported in hardware to enable differentiated management of up to four types of trafﬁc.

• WeightedRound Robin(WRR) schedulingto ensure differential prioritization of packet ﬂows by intelligently servicing the egress queues.

• Weighted Random Early Detection (WRED) on all Gigabit Ethernet ports for avoidance of congestion at the egress queues before a disruption occurs.

• Strict priority queuing to guarantee that the highest-priority packets will always get serviced ahead of all other trafﬁc.

• No performance penalty for highly granular QoS functionality.

Granular rate-limiting • Cisco Committed Information Rate (CIR) functionality allows bandwidth to

be guaranteed in increments as low as 8 Kbps.

• Rate-limiting based on source/destination IP address, source/destination MAC address, or Layer 4 TCP/UDP information—or any combination of these ﬁelds—using QoS ACLs (IP ACLs or MAC ACLs), class maps, policy maps and per VLAN per port.

High-performance IP routing

Except static routing, RIPv1, and RIPv2, all other IP routing features require the Enhanced Multilayer Software Image (EMI)

• Ability to easily manage data-ﬂows asynchronously both upstream and downstream from the end-station or on the uplink via ingress and egress policing.

• Eight aggregate or individual ingress policers and eight aggregate egress policers on each 10/100 port.

• 128 aggregate or individual ingress policers and eight aggregate egress policers on each Gigabit Ethernet port.

• Cisco Express Forwarding-based routing architecture performed in hardware to deliver extremely high-performance IP routing.

• Supportfor all commonly deployedand industry standard IPunicast routing protocols (RIPv1, RIPv2, OSPF, IGRP, EIGRP) for load balancing and constructing scalable LANs.

• Static IP routing for manually building a routing table of network path information.

• Exterior BGP (eBGP) support to exchange route information between routers from different autonomous systems. Interior BGP (iBGP) is supported to exchange routes between the routers within the same autonomous systems.

• Inter-VLAN IP routing for full Layer 3 routing between two or more VLANs.

• Equal-cost routing for load balancing and redundancy.

• Fallback bridging for forwarding of non-IP trafﬁc between two or more VLANs.

• Cisco HSRP to create redundant fail-safe routing topologies.

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Feature Benefit

Resiliency and reliability • IEEE 802.1w Rapid Spanning Tree (RSTP) takes advantage of point-to-point

wiring and provides rapid convergence of the spanning tree independent of spanning-tree timers. Reconﬁguration of the spanning tree can occur in less than one second, which is critical for metro networks carrying mission-critical and delay-sensitive trafﬁc such as enterprise data, voice, and video.

• IEEE 802.1s Multiple Spanning Tree (MSTP), which uses RSTP for rapid convergence, enables VLANs to be grouped into a spanning-tree instance, with each instance having a spanning-tree topology independent of other spanning-tree instances. This architecture provides for multiple forwarding paths for data trafﬁc, enables load balancing, and reduces the number of spanning-tree instances required to support a large number of VLANs.

• Cisco UplinkFast/BackboneFast technologies ensure quick failover recovery, enhancing overall network stability and reliability.

• Cisco CrossStack UplinkFast (CSUF) technology provides increased redundancy and network resiliency through fast spanning-tree convergence (fewer than two seconds) across a stack of switches using GigaStack GBICs in an independent stack backplane cascaded conﬁguration.

• Redundant stacking connections provide support for a redundant loopback connection for top and bottom switches in an independent stack backplane cascaded conﬁguration.

• Bridge protocol data unit (BPDU) guard shuts down Spanning-Tree Protocol PortFast-enabled interfaces when BPDUs are received to avoid accidental spanning-tree topology changes.

• Spanning-tree root guard prevents edge devices outside the network administrator’s control from becoming STP root nodes.

• Command switch redundancy enabled in the Cisco Cluster Management Suite (CMS) Software allows customers to designate a backup command switch that takes over cluster management functions if the primary command switch fails.

• Unidirectional link detection (UDLD) detects and disables unidirectional links on ﬁber-optic interfaces caused by incorrect ﬁber-optic wiring or port faults. Aggressive UDLD allows precautionary disabling of port on bidirectional links.

• Per-port broadcast, multicast, and unicast storm control prevents faulty end-stations from degrading overall systems performance.

• Support for (Redundant Power System) 300 (RPS 300) that provides superior internal power source redundancy for up to six Cisco networking devices resulting in improved fault tolerance and network uptime.

Redundancy • Bandwidth aggregation of up to 16 Gbps through Cisco Gigabit

EtherChannel technology and up to 1.6 Gbps through Cisco Fast EtherChannel technology enhances fault tolerance and offers higher-speed aggregated bandwidth between switches, to routers and individual servers.

• Supports Cisco HSRP to create redundant failsafe routing topologies.

• IEEE 802.1D Spanning Tree Protocol support for redundant backbone connections and loop-free networks simpliﬁes network conﬁguration and improves fault tolerance.

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Feature Benefit

• Per VLAN Spanning Tree Plus (PVST+) allows for Layer 2 load-sharing on redundant links to efﬁciently use the extra capacity inherent in a redundant design.

• Equal-cost routing for Layer 3 load-balancing and redundancy.

• Local Proxy ARP works in conjunction with private VLAN edge to minimize broadcasts and maximize available bandwidth.

• VLAN Trunking Protocol (VTP) pruning limits bandwidth consumption on VTP trunks by ﬂooding broadcast trafﬁconly on trunk links requiredto reach the destination devices.

• Internet Group Management Protocol (IGMP) snooping provides for fast client “joins” and “leaves” of multicast streams and limits bandwidth-intensive video trafﬁc to only the requestors.

• Multicast VLAN registration (MVR) continuously sends multicast streams in a multicast VLAN while isolating the streams from subscriber VLANs for bandwidth and security reasons.

Scalability • The Cisco CWDM GBIC solution support allows for the scaling of bandwidth

without deploying additional ﬁber. It provides scalability of up to eight Gigabits of bandwidth on a pair of single-mode ﬁbers to reach the distances up to 100–120 km.

• Support for up to 4,096 VLAN Ids with 1,005 active VLANs per switch; and up to 128 spanning tree instances per switch.

• VLAN trunks can be created from any port using either standards-based

802.1Q tagging or the Cisco ISL VLAN architecture.

Network-wide security features • IEEE 802.1x for dynamic port-based security.

• Cisco security VLAN ACLs (VACLs) on all VLANs to prevent unauthorized data ﬂows to be bridged within VLANs.

• Cisco standard and extended IP security Router ACLs (RACLs) for deﬁning security policies on routed interfaces for control plane and data plane trafﬁc.

• Port-based ACLs for Layer 2 interfaces allows security policy to be applied on per-Layer 2 port basis.

• Time-based ACLs allow the implementation of security settings during speciﬁc periods of the day.

• Private VLAN edge provides security and isolation between ports on a switch, ensuring that voice trafﬁc travels directly from its entry point to the aggregation device through a virtual path and cannot be directed to a different port.

• TACACS+ and RADIUS authentication to enable centralized control of the switch and restrict unauthorized users from altering the conﬁguration.

• Port security secures the access to a port based on the MAC address of a user’sdevice and prevents unauthorized stations fromaccessing the switch. The aging feature provides the capability to limit the number of concurrent devices per port.

• Multilevel security on console access prevents unauthorized users from altering the switch conﬁguration.

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Feature Benefit

• SSH and SNMPv3 provides network security by encrypting administrator trafﬁc during Telnet and SNMP sessions. SSH and the crypto version of SNMPv3 require a special crypto software image due to US export restrictions.

• The user-selectable address-learning mode simpliﬁes conﬁguration and enhances security.

• DHCP Interface Tracker (Option 82) enables the DHCP relay agent (Cisco Catalyst 3550 Series Switch) to include information about itself and the attached client when forwarding DHCP requests from a DHCP client to a DHCP server.

Superior manageability • Cisco IE 2100 Series support for ﬂow-through provisioning and integration

with OSS applications via programmable interfaces.

• Simple Network Management Protocol (SNMP) v1, v2c, and v3, and Telnet interface support delivers comprehensive in-band management, and a command-line interface (CLI)-basedmanagement console provides detailed out-of-band management.

• Manageable through CiscoWorks network management software on a per-port and per-switch basis providing a common management interface for Cisco routers, switches, and hubs.

• Cisco IOS CLI support provides common user interface and command set with all Cisco routers and Cisco desktop switches.

• Comprehensive MIBs provided for the service provider to collect trafﬁc information on Cisco Catalyst 3550 Series for various billing methods.

• Supported by the Cisco Quality Policy Manager (QPM) solution for end-to-end QoS policies

• Support for dynamic VLAN assignment through implementation of VLAN Membership Policy Server (VMPS) client functionality provides ﬂexibility in assigning ports to VLANs. Dynamic VLAN enables fast assignment of IP address.

• Supported by the CiscoWorks 2000 LAN Management Solution.

• Supported by the Cisco Service Assurance (SA) Agent to facilitate service level management throughout the LAN.

• Built-in Web-based Cisco Cluster Management Suite (CMS) Software provides an easy-to-use Web-based management interface through a standard Web browser.

• Switch Database Manager templates for access, routing, and VLAN deployment scenarios allow the network administrator to easily maximize memory allocation to the desired features based on deployment-speciﬁc requirements.

• Embedded Remote Monitoring (RMON) software agent supports four RMON groups (history, statistics, alarms, and events) for enhanced trafﬁc management, monitoring, and analysis.

• Support for all nine RMON groups through use of a Switch Port Analyzer (SPAN) port, which permits trafﬁc monitoring of a single port, a group of ports, or the entire switch from a single network analyzer or RMON probe.

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Feature Benefit

• RSPAN (Remote SPAN) allows network administrators to remotely monitor ports in a Layer 2 switch network from any other switch in the same network.

• Domain Name Services (DNS) provide IP address resolution with user-deﬁned device names.

• Trivial File Transfer Protocol (TFTP) reduces the cost of administering software upgrades by downloading from a centralized location.

• Network Timing Protocol (NTP) provides an accurate and consistent timestamp to all switches within the intranet.

• Multifunction LEDs per port for port status, half-duplex/full-duplex, 10BaseT/ 100BaseTX/1000BaseT indication, as well as switch-level status LEDs for system, redundant power supply, and bandwidth utilization provide a comprehensive and convenient visual management system.

Product Specifications

Feature Description

Performance • 24 Gbps switching fabric (Cisco Catalyst 3550-12G and Cisco Catalyst

3550-12T), 13.6 Gbps switching fabric (Cisco Catalyst 3550-48), 8.8 Gbps switching fabric (Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• 12 Gbps maximum forwarding bandwidth at Layer 2 and Layer 3 (Cisco Catalyst 3550-12G and Cisco Catalyst 3550-12T), 6.8 Gbps maximum forwarding bandwidth at Layer 2 and Layer 3 (Cisco Catalyst 3550-48), 4.4 Gbps maximum forwarding bandwidth at Layer 2 and Layer 3 (Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• 17.0 Mpps forwarding rate for 64-byte packets (Cisco Catalyst 3550-12G and 3550-12T), 10.1Mpps forwarding rate for 64-byte packets (Catalyst 3550-48),

6.6 Mpps forwarding rate for 64-byte packets (Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• 4 MB memory architecture shared by all ports (Cisco Catalyst 3550-12G, 3550-12T, and 3550-48), 2MB memory architectureshared by all ports(Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• 64 MB DRAM and 16 MB Flash memory for CPU subsystem

• Conﬁgurable up to 12,000 MAC addresses (Cisco Catalyst 3550-12G and 3550-12T), conﬁgurable up to 8,000 MAC addresses (Cisco Catalyst 3550-48, 3550-24, 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• Conﬁgurable up to 24,000 unicast routes (Cisco Catalyst 3550-12G and 3550-12T), Conﬁgurable up to 16,000 unicast routes (Cisco Catalyst 3550-48, Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• Conﬁgurable up to 8,000 multicast routes (Cisco Catalyst 3550-12G and 3550-12T), Conﬁgurable up to 2,000 multicast routes (Cisco Catalyst 3550-48, Catalyst 3550-24, Catalyst 3550-24-DC, and Catalyst 3550-24-FX)

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Feature Description

• Conﬁgurable Maximum Transmission Unit (MTU) of up to 2,000 Bytes for bridging of MPLS tagged frames (Cisco Catalyst 3550-12G and 3550-12T), Conﬁgurable Maximum Transmission Unit (MTU) of up to 1,546 Bytes for bridging of MPLS tagged frames (Cisco Catalyst 3550-48, Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

Management • BRIDGE-MIB (RFC 1493)

• CISCO-CDP-MIB

• CISCO-CLUSTER-MIB

• CISCO-CONFIG-MAN-MIB

• CISCO-FLASH-MIB

• CISCO-HSPR-EXT-MIB

• CISCO-HSRP-MIB

• CISCO-IGMP-FILTER-MIB

• CISCO-IMAGE-MIB

• CISCO-L2L3-INTERFACE-MIB

• CISCO-MAC-NOTIFICATION-MIB

• CISCO-MEMORY-POOL-MIB

• CISCO-PAGP-MIB

• CISCO-PORT-QOS-MIB

• CISCO-PROCESS-MIB

• CISCO-RTTMON-MIB (subsystems supported: sub_rtt_rmon and sub_rtt_rmonlib)

• CISCO-STACK-MIB (only a subset of the available MIB objects are implemented; not all objects are supported)

• CISCO-STP-EXTENSIONS-MIB

• CISCO-TCP-MIB

• CISCO-VLAN-IFTABLE-RELATIONSHIP-MIB

• CISCO-VLAN-IFINDEX-RELATIONSHIP-MIB

• CISCO-VLAN-MEMBERSHIP-MIB

• CISCO-VTP-MIB

• ENTITY-MIB

• IF-MIB

• IGMP-MIB

• IPMROUTE-MIB

• OLD-CISCO-CHASSIS-MIB

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Feature Description

• OLD-CISCO-SYSTEM-MIB

• OLD-CISCO-TS-MIB

• OSPF-MIB (RFC 1253)

• PIM MIB

• RFC1213-MIB

• RMON1-MIB (only RMON etherStats, etherHistory, alarms, and events are supported)

• RMON2-MIB

• SNMPv2-MIB

• TCP-MIB

• UDP-MIB

Standards • IEEE 802.1x

• IEEE 802.1w

• IEEE 802.1s

• IEEE 802.3x full duplex on 10BaseT, 100BaseTX, and 1000BaseT ports

• IEEE 802.1D Spanning-Tree Protocol

• IEEE 802.1p CoS Prioritization

• IEEE 802.1Q VLAN

• IEEE 802.3 10BaseT speciﬁcation

• IEEE 802.3u 100BaseTX speciﬁcation

• IEEE 802.3ab 1000BaseT speciﬁcation

• IEEE 802.3z 1000BaseX speciﬁcation

• 1000BaseX (GBIC)

• 1000BaseSX

• 1000BaseLX/LH

• 1000BaseZX

• 1000Base-CWDM GBIC 1470nm

• 1000Base-CWDM GBIC 1490nm

• 1000Base-CWDM GBIC 1510nm

• 1000Base-CWDM GBIC 1530nm

• 1000Base-CWDM GBIC 1550nm

• 1000Base-CWDM GBIC 1570nm

• 1000Base-CWDM GBIC 1590nm

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Feature Description

• 1000Base-CWDM GBIC 1610nm

• RMON I and II standards

• SNMPv1, SNMPv2c, AND SNMPv3

Year 2000 (Y2K) compliance • Y2K compliant Connectors and cabling • 10BaseT ports: RJ-45 connectors; two-pair Category 3, 4, or 5 unshielded

twisted-pair (UTP) cabling

• 100BaseTX ports: RJ-45 connectors; two-pair Category 5 UTP cabling

• 100BaseFX ports: MT-RJ connectors, 50/125 or 62.5/125 micron multimode ﬁber-optic cabling

Type of Cable Cisco Part Number

• 1-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-1M

• 3-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-3M

• 5-meter, MT-RJ-to-SC multimode cable CAB-MTRJ-SC-MM-5M

• 1-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-1M

• 3-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-3M

• 5-meter, MT-RJ-to-ST multimode cable CAB-MTRJ-ST-MM-5M

• 1000BaseT ports: RJ-45; two-pair Category 5 UTP cabling

• 1000BaseT GBIC-based ports: RJ-45 connectors; two-pair Category 5 UTP cabling

• 1000BaseSX, -LX/LH, -ZX, and CWDM GBIC-based ports: SC ﬁber connectors, single-mode or multimode ﬁber

• Cisco GigaStack GBIC ports: copper-based Cisco GigaStack cabling

• Management console port: 8-pin RJ-45 connector, RJ-45-to-RJ-45 rollover cable with RJ-45-to-DB9 adapter for PC connections; for terminal connections, use RJ-45-to-DB25 female data-terminal-equipment (DTE) adapter (can be ordered separately from Cisco, part number ACS-DSBUASYN=)

Power connectors Customers can provide power to a switch by using either the internal power

supply or the Cisco RPS 300 Redundant Power System. The connectors are located at the back of the switch.

Internal Power Supply Connector

• The internal power supply is an auto-ranging unit.

• The internal power supply supports input voltages between 100 and 240 VAC.

• Use the supplied AC power cord to connect the AC power connector to an AC power outlet.

Cisco RPS Connector

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Feature Description

• The connector offers connection for an optional Cisco RPS 300 that uses AC input and supplies DC output to the switch.

• The connector offers a 300-watt redundant power system that can support six external network devices and provides power to one failed device at a time.

• The connector automatically senses when the internal power supply of a connected device fails and provides power to the failed device, preventing loss of network trafﬁc.

• Attach only the Cisco RPS 300 (model PWR300-AC-RPS-N1) to the redundant-power-supply receptacle.

Indicators • Per-port status LEDs: link integrity, disabled, activity, speed, and

full-duplex indications

• System status LEDs: system, RPS, and bandwidth utilization indications

Dimensions and weight (HxWxD) • 2.63 x 17.5 x 15.9 in. (6.7 x 40.4 x 44.5 cm) (Cisco Catalyst 3550-12G and

3550-12T)

• 1.75 x 17.5 x 14.4 in. (4.45 x 36.6 x 44.5 cm) (Cisco Catalyst 3550-24 and Cisco Catalyst 3550-24-DC)

• 1.75 x 17.5 x 16.3 in. (4.45 x 41.3 x 44.5 cm) (Cisco Catalyst 3550-48 and Cisco Catalyst 3550-24-FX)

• 1.5 rack-unit (RU) high (Cisco Catalyst 3550-12G and 3550-12T)

• 1.0 RU high (Cisco Catalyst 3550-48, Cisco Catalyst 3550-24, Cisco Catalyst 3550-24-DC, and Cisco Catalyst 3550-24-FX)

• 16 lb (7.26 kg) (Cisco Catalyst 3550-12G and 3550-12T)

• 11 lb (5.0 kg) (Cisco Catalyst 3550-24 and Cisco Catalyst 3550-24-DC)

• 13 lb (5.9 kg) (Cisco Catalyst 3550-48)

• 12 lb (5.45 kg) (Cisco Catalyst 3550-24-FX)

Environmental ranges • Operating temperature: 32 to 113 F (0 to 45 C)

• Storage temperature: –13 to 158 F (–25 to 70 C)

• Operating relative humidity: 10 to 85% (noncondensing)

• Operating altitude: Up to 10,000 ft (3049 m)

• Storage altitude: Up to 15,000 ft (4573 m)

Power requirements • Power consumption: 190W (maximum), 650 BTUs per hour (Cisco Catalyst

3550-12G and 3550-12T); 65W (maximum), 222 BTUs per hour (Cisco Catalyst 3550-24);110W (maximum), 375 BTUs per hour (Cisco Catalyst 3550-48); 72W (maximum), 250 BTUs per hour (Cisco Catalyst 3550-24-DC); 85W (maximum), 290 BTUs per hour (Cisco Catalyst 3550-24-FX)

• AC input voltage/frequency: 100 to 127/200 to 240 VAC (auto-ranging), 50 to 60 Hz

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Feature Description

• DC input voltages – RPS input: +12V @ 13A (Catalyst 3550-12G, 3550-12T, and 3550-48); +12V

@ 8.3A (Catalyst 3550-24 and 3550-24-FX)

– DC input for 3550-24-DC: –36 to –72VDC @ 2A

Acoustic noise • ISO 7770, bystander position—operating to an ambient temperature of 30

degrees Celsius: – Catalyst 3550-12G and 3550-12T: 58 dBa – Catalyst 3550-24 and 3550-24-DC: 48 dBa – Catalyst 3550-48 and 3550-24-FX: 46 dBa

Mean time between failure (MTBF) • 110,332 hours (Cisco Catalyst 3550-12G)

• 113,658 hours (Cisco Catalyst 3550-12T)

• 193,000 hours (Cisco Catalyst 3550-24)

• 163,000 hours (Cisco Catalyst 3550-48)

• 183, 000 hours (Cisco Catalyst 3550-24-DC)

• 186,000 hours (Cisco Catalyst 3550-24-FX)

Regulatory Agency Approvals

Safety certiﬁcations • UL to UL 1950, Third Edition

• c-UL to CAN/CSA 22.2 No. 950-95, Third Edition

• TUV/GS to EN 60950 with Amendment A1-A4 and A11

• CB to IEC 60950 with all country deviations

• NOM to NOM-019-SCFI

• CE Marking

Electromagnetic emissions certiﬁcations

• FCC Part 15 Class A

• EN 55022 Class A (CISPR 22 Class A)

• VCCI Class A

• AS/NZS 3548 Class A

• BSMI

• CE Marking

Network Equipment Building Systems (NEBS) (for 3550-24-DC)

• Bellcore

• GR-1089-CORE

• GR-63-CORE

• SR-3580 Level 3

Warranty • Limited lifetime warranty

Cisco Systems, Inc.

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Service and Support

The servicesandsupport programs described in the Table below are available aspartof the Cisco Desktop Switching Service and Support solution, and are available directly from Cisco and through resellers.

Service and Support Features Benefits Cisco Advanced Services •

Cisco Total Implementation Solutions (TIS)—available direct from Cisco

Packaged Total Implementation Solutions (Packaged TIS)—available through resellers

Cisco Technical Support Services

Cisco SMARTnet™ and SMARTnet Onsite (OS)—available direct from Cisco

Packaged SMARTnet—available through resellers

• Project management

• Site survey, conﬁguration deployment

• Installation, text, and cutover

• Training

• Major moves, adds, changes (MAC)

• Design review and product staging

• 24x7 access to software updates

• Web access to technical repositories

• Telephone support through the Cisco Technical Assistance Center

• Advance replacement of hardware parts

Ordering Information

Model Numbers Configuration

WS-C3550-12G • 10 1000BaseX ports + 2 10/100/1000BaseT ports

• 1.5 rack unit (RU) stackable, multilayer Gigabit Ethernet switch

• Provides advanced IP routing

• Supplements existing staff

• Ensures functionality meets needs

• Mitigates risk

• Enables proactive or expedited issue resolution

• Lowers cost of ownership by utilizing Cisco expertise and knowledge

• Minimizes network downtime

WS-C3550-12T • 10 10/100/1000BaseT ports + 2 1000BaseX ports

• 1.5 rack unit (RU) stackable, multilayer Gigabit Ethernet switch

• Provides advanced IP routing

WS-C3550-24-SMI • 24 10/100 ports + 2 1000BaseX ports

• 1 RU stackable, multilayer switch

• Provides advanced IP routing

• Standard Multilayer Software Image (SMI) installed, upgradable to advanced IP routing

WS-C3550-24-DC-SMI • 24 10/100 ports + 2 1000BaseX ports

• 1 RU stackable, multilayer switch; DC-Powered

• Provides basic IP routing

• Standard Multilayer Software Image (SMI) installed, upgradable to advanced IP routing

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Model Numbers Configuration

WS-C3550-24-FX-SMI • 24 100FX ports + 2 1000BaseX ports

• 1 RU stackable, multilayer switch

• Provides basic IP routing

• Standard Multilayer Software Image (SMI) installed, upgradable to advanced IP routing

WS-C3550-24-EMI • 24 10/100 ports + 2 1000BaseX ports

• 1 RU stackable, multilayer switch

• Enhanced Multilayer Software Image (EMI) installed

• Provides advanced IP routing

WS-C3550-48-SMI • 48 10/100 ports + 2 1000BaseX ports

• 1 RU stackable, multilayer switch

• Standard Multilayer Software Image (SMI) installed, upgradable to advanced IP routing

WS-C3550-48-EMI • 48 10/100 ports + 2 1000BaseX ports

• 1 RU stackable, multilayer switch

• Enhanced Multilayer Software Image (EMI) installed

• Provides advanced IP routing

CD-3550-EMI= • Enhanced Multilayer Software Image (EMI) upgrade kit for standard versions of

the Cisco Catalyst 3550-24, 3550-24-DC, 3550-24-FX, and 3550-48 switches

• Provides advanced IP routing

RCKMNT-3550-1.5RU= • Spare rack mount kit for the Cisco Catalyst 3550-12G and 3550-12T switches RCKMNT-1RU= • Spare rack mount kit for the Cisco Catalyst 3550-24, 3550-24-DC, 3550-24-FX, and

3550-48 switches

For More Information on Cisco Products, Contact:

• United States and Canada: 800 553-NETS (6387)

• Europe: 32 2 778 4242

• Australia: 612 9935 4107

• Other: 408 526-7209

• World Wide Web URL: http://www.cisco.com

Cisco Systems, Inc.

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Corporate Headquarters

Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA www.cisco.com Tel: 408 526-4000

800 553-NETS (6387)

Fax: 408 526-4100

European Headquarters

Cisco Systems International BV Haarlerbergpark Haarlerbergweg 13-19 1101 CH Amsterdam The Netherlands www-europe.cisco.com Tel: 31 0 20 357 1000 Fax: 31 0 20 357 1100

Cisco Systems has more than 200 ofﬁces in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the

Cisco Web site at www.cisco.com/go/offices

Argentina • Australia • Austria • Belgium • Brazil • Bulgaria • Canada • Chile • China PRC • Colombia • Costa Rica • Croatia Czech Republic • Denmark • Dubai, UAE • Finland • France • Germany • Greece • Hong Kong SAR • Hungary • India • Indonesia • Ireland Israel • Italy • Japan • Korea • Luxembourg • Malaysia • Mexico • The Netherlands • New Zealand • Norway • Peru • Philippines • Poland Portugal • Puerto Rico • Romania • Russia • Saudi Arabia • Scotland • Singapore • Slovakia • Slovenia • South Africa • Spain • Sweden Switzerland • Taiwan • Thailand • Turkey • Ukraine • United Kingdom • United States • Venezuela • Vietnam • Zimbabwe

All contents are Copyright © 1992–2002, Cisco Systems, Inc. All rightsreserved.CCIP,the Cisco Arrow logo, the CiscoPowered Network mark, the Cisco SystemsVerifiedlogo, Cisco Unity, Follow Me Browsing,FormShare, iQ Breakthrough, iQ Expertise, iQ FastTrack, the iQ logo, iQ Net Readiness Scorecard, Networking Academy, ScriptShare, SMARTnet, TransPath, and Voice LAN are trademarks of Cisco Systems, Inc.; Changing the Way We Work, Live, Play, and Learn, Discover All That’s Possible, The Fastest Way to Increase Your Internet Quotient, and iQuick Study are service marks of Cisco Systems, Inc.; and Aironet, ASIST, BPX, Catalyst, CCDA, CCDP, CCIE, CCNA, CCNP, Cisco, the Cisco Certified Internetwork Expert logo, Cisco IOS, the Cisco IOS logo, Cisco Press, Cisco Systems, Cisco Systems Capital, the Cisco Systems logo, Empowering the Internet Generation, Enterprise/Solver, EtherChannel, EtherSwitch, Fast Step, GigaStack, Internet Quotient, IOS, IP/TV, LightStream, MGX, MICA, the Networkers logo, Network Registrar, Packet, PIX, Post-Routing, Pre-Routing, RateMUX, Registrar, SlideCast, StrataView Plus, Stratm, SwitchProbe, TeleRouter, and VCO are registered trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and certain other countries.

All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (0208R) LW3663 1002

Americas Headquarters

Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA www.cisco.com Tel: 408 526-7660 Fax: 408 527-0883

Asia Paciﬁc Headquarters

Cisco Systems, Inc. Capital Tower 168 Robinson Road #22-01 to #29-01 Singapore 068912 www.cisco.com Tel: +65 317 7777 Fax: +65 317 7799

Cisco Catalyst 3550, Catalyst 3550-24, Catalyst 3550-48, Catalyst 3550 Series Datasheet

Specifications and Main Features

Frequently Asked Questions

User Manual