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WS-C3550-24-SMI
Cisco WS-C3550-24-SMI Catalyst 3550 24-Port Fast Ethernet Sw...
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WS-C3550-24-SMI is a managed, non-PoE enterprise access switch with 24 copper 10/100 Mbps ports and two fixed 1G GBIC uplink sockets. The standard multilayer software image, also called IP Base, provides Layer 2+ operation in a rack-mount 1U chassis. The Cisco Catalyst 3550 serves retained Fast Ethernet access configurations where the existing copper connections determine the hardware requirement. Its uplink architecture accepts GBIC-format interfaces rather than removable network cards. WS-C3550-24PWR-SMI is the discontinued powered sibling, distinguishing an endpoint-power requirement from the configuration offered here. A Catalyst 3550-24 purchase should match the existing access configuration rather than assume that Gigabit uplinks change the native speed of the copper interfaces.
WS-C3550-24-SMI price for new stock is is available on request. Get immediate quote. WS-C3550-24-SMI refurb price is $55.59.
Request bulk order quote for WS-C3550-24-SMI for additional pricing. Browse the full Cisco 3550 Catalyst Switches series or explore all Cisco products.
8.8 Gbps switching capacity defines the aggregate switching envelope. 6.6 Mpps forwarding with 64-byte packets supplies the packet-rate reference for traffic sizing. Static routing and RIP are available with the standard image; OSPF and EIGRP require the enhanced image. WS-C3550-24-SMI carries 64 MB DRAM and 16 MB flash for working memory and image storage. An 8000-entry MAC table bounds address learning, while the 16000-route hardware total remains distinct from the installed image's protocol capabilities. A shared 2 MB packet buffer and four egress queues per port support traffic classification and scheduling. STP and PVST+ provide Layer 2 loop control, and PAgP forms EtherChannel groups. Management addressing can use a loopback, a routed physical interface, or an SVI. 65W maximum input draw sets the ceiling for provisioning chassis power within the rack. These limits should be checked against the retained configuration before commissioning.
WS-C3550-24-SMI is offered new sealed or certified refurbished, with ORM warranties of up to 3-year extended coverage for new units and up to 1 year for certified refurbished units; returns are available for 30 days on every condition, terms apply. Certified refurbished units are inspected and bench-tested for power-on and POST, every port linking at rated speed, and clean boot; firmware is verified and configurations are wiped to factory default. Specify condition, installed image, included accessories, and quantity on the purchase order; Cisco hardware warranty and service ended May 2, 2011. For enterprise and volume orders, PO accepted, Net-30 for government, and RMA with advance replacement apply across UK, EU, US, and MEA regional stock and RMA operations.
| Key Specs | Key Spec Values |
|---|---|
Operating System | Cisco IOS |
License Tier | SMI / IP Base |
Port Configuration | 24 x 10/100 / 2 x 1G GBIC |
Stacking | GigaStack via WS-X3500-XL / 9 members |
Max Power Draw | 65W |
Lifecycle Status | Sale ended May 2, 2006 / Support ended May 2, 2011 |
When a test rack needs repeatable switching configurations rather than production manufacturer support, the hardware supports 1005 VLANs and 128 spanning-tree instances. Separate switching exercises from features requiring an enhanced image, and keep the selected software consistent across the test units. Specify the required image and staging quantity before the purchase order.
When extending an existing WS-X3500-XL GigaStack GBIC interconnect, the daisy-chain bus carries 1 Gbps, while a point-to-point connection reaches 2 Gbps. Interconnect topology changes the available bandwidth, so match the installed arrangement rather than treating each connection identically. Confirm the WS-X3500-XL adapters and compatible cabling required before issuing the purchase order.
When several wiring closets need shared administration, Cisco Cluster Management Suite can manage 16 interconnected switches through one IP address, including units outside the same closet. Management grouping does not eliminate individual switch configuration requirements. Confirm the management addressing, browser environment, and number of participating units before specifying the order quantity.
Native Gigabit connections for desktop endpoints
WS-C3550-24-SMI limits its copper access interfaces to 10/100 Mbps. Gigabit operation belongs to the uplink sockets, so endpoints requiring native 1G access exceed this model's downlink capability.
Power delivery to connected endpoints
WS-C3550-24-SMI does not supply endpoint power through its access ports. Phones, access points, or other powered devices need a separate power source rather than a PoE allocation from this model.
OSPF or EIGRP without software changes
WS-C3550-24-SMI provides static routing and RIP with SMI. OSPF and EIGRP require EMI, so the standard image does not satisfy those routing requirements unchanged.
Active Cisco hardware support coverage
Cisco hardware support for WS-C3550-24-SMI ended May 2, 2011. A purchase requiring an active manufacturer service lifecycle cannot be fulfilled by this retired switch.
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| WS-C3550-24-SMI |  WS-C3550-24PWR-EMI |  WS-C3550-24PWR-SMI |  WS-C3550-12G |  WS-C3550-12T | |
|---|---|---|---|---|---|
| Ethernet Technology | Fast Ethernet | Fast Ethernet | Fast Ethernet | Gigabit Ethernet | Gigabit Ethernet |
| Flash Memory | 16 MB | 16 MB | 16 MB | 16 MB | 16 MB |
| Form Factor | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1.5U | Rack-Mount 1.5U |
| Height | 44.5 mm | 44.5 mm | 44.5 mm | 67 mm | 67 mm |
| Manufacturer Part Number | WS-C3550-24-SMI | WS-C3550-24PWR-EMI | WS-C3550-24PWR-SMI | WS-C3550-12G | WS-C3550-12T |
| Memory | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB |
| Power Consumption | 65W | 525W | 525W | 190W | 190W |
| Switching Capacity | 8.8 Gbps | 8.8 Gbps | 8.8 Gbps | 24 Gbps | 24 Gbps |
| Weight | 5 kg | 6.35 kg | 6.35 kg | 7.26 kg | 7.26 kg |
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WS-C3550-24-SMI identifies a Catalyst 3550 switch with 24 10/100 access ports and the Standard Multilayer Software Image. WS-C3550 is the switch-family identifier, 24 is the access-port count, and SMI is the software-image suffix. The configuration also includes two GBIC-based Gigabit uplink sockets.
The Catalyst 3550 is managed through the browser-based Cisco Cluster Management Suite, console CLI, Telnet, SNMP, and CiscoWorks; SSH requires a cryptographic image. These paths provide local or network-based administration. Confirm the installed image and the required management method before applying an existing configuration to a replacement unit.
WS-C3550-24-SMI is discontinued, with end of sale on May 2, 2006, and hardware support ending May 2, 2011. Cisco service has ended. Procurement for retained installations should distinguish the condition and included components of legacy stock from the availability of manufacturer support.
WS-C3550-24-SMI is offered new sealed or certified refurbished, with ORM warranties of up to 3-year extended coverage for new units and up to 1 year for certified refurbished units. Returns are available for 30 days on every condition; terms apply. Cisco's original limited lifetime hardware warranty and service ended May 2, 2011.
WS-C3550-24-SMI starts with SMI, also called IP Base; the enhanced-image upgrade path is EMI, also called IP Services. Those names distinguish the standard and full-routing feature sets. Specify the installed image and required software entitlement separately from hardware condition, rather than assuming that refurbishment changes the feature set.
WS-C3550-24-SMI uses GBIC-format transceivers in its two 1G uplink sockets, not SFP modules. WS-G5484 provides 1000BASE-SX, WS-G5486 provides 1000BASE-LX/LH, and WS-G5487 provides 1000BASE-ZX. Select the transceiver to match the installed fiber and remote interface, and identify the required accessory PIDs on the purchase order.
Catalyst 3550 GigaStack connects nine switches in a daisy chain through WS-X3500-XL GigaStack GBIC adapters. This hardware interconnect is separate from browser-based cluster management. Choose the interconnect topology first because it changes available bandwidth, and confirm the WS-X3500-XL adapters and compatible cabling included with each order.
Yes, WS-C3550-24-SMI supports IPv4 routing with static routes and RIP under SMI. IP routing is disabled by default and must be enabled before routed operation. OSPF, IGRP, and EIGRP require the enhanced image, so the standard configuration must not be quoted as full dynamic routing.
WS-C3550-24-SMI supports external backup through PWR300-AC-RPS-N1, the Cisco RPS 300, alongside its internal AC supply. The external system backs up one connected device at a time. This is not a second internal redundant supply; specify the PWR300-AC-RPS-N1 equipment and its connection requirements separately.
WS-C3550-24PWR-SMI provides inline endpoint power, while WS-C3550-24-SMI does not; both are discontinued. The powered variant suits retained installations requiring compatible endpoint powering. The non-PoE variant suits existing installations where endpoint power is supplied separately. Verify powered-device compatibility rather than treating the older inline-power implementation as unrestricted PoE support.
WS-C3550-24-EMI ships with the enhanced multilayer software image, while WS-C3550-24-SMI ships with the standard image; both are discontinued. The difference concerns the installed routing feature set. SMI fits retained switching and basic-routing configurations, whereas EMI fits legacy configurations requiring the full dynamic IP routing feature set.
WS-C3550-48-SMI supplies 48 copper access ports, while WS-C3550-24-SMI supplies 24; both are discontinued. The larger variant addresses retained installations with more copper connections in one unit. The smaller variant addresses existing lower-density configurations. Match the installed image and uplink accessories separately from the port-density decision.
The Catalyst 3550-24 requires 1U of rack space and measures 44.5 mm high, 445 mm wide, and 366 mm deep, with a weight of 5 kg. Use these dimensions for cabinet clearance, and confirm whether RCKMNT-1RU= rack-mount hardware is included with the order.
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