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WS-C3550-24PWR-SMI
Cisco WS-C3550-24PWR-SMI Catalyst 3550 24-Port Fast Ethernet...
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WS-C3550-24PWR-SMI is a managed Layer 2+ access switch with 24 10/100 Ethernet ports supplying Cisco inline power and two fixed GBIC-based Gigabit Ethernet uplink positions. Its powered connections serve compatible legacy IP phones and wireless access points, rather than establishing universal compatibility with standards-based powered devices. The Catalyst 3550 occupies one rack unit and belongs to an enterprise access family with hardware traffic classification and basic IP routing. The supplied Standard Multilayer Software Image, subsequently named IP Base, defines the routing capabilities included with this configuration. The discontinued WS-C3550-24-SMI provides the corresponding non-powered access configuration. This Fast Ethernet inline-power switch retains the older GBIC interface format, so its uplink architecture should not be confused with switches using SFP cages or removable uplink cards.
WS-C3550-24PWR-SMI price for new stock is is available on request. Get immediate quote. WS-C3550-24PWR-SMI refurb price is $47.25.
Request bulk order quote for WS-C3550-24PWR-SMI for additional pricing. Browse the full Cisco 3550 Catalyst Switches series or explore all Cisco products.
8.8 Gbps switching capacity provides the switching fabric for the access and uplink interfaces, while 6.6 Mpps forwarding handles minimum-size packets. Static routing, RIPv1 and RIPv2 provide the included routing functions; OSPF, EIGRP and BGPv4 require the higher software feature set. A 525W maximum power consumption figure governs electrical provisioning rather than representing the power available to endpoints. WS-C3550-24PWR-SMI carries 64 MB DRAM and 16 MB flash for software operation and image storage. Its 2 MB shared packet memory serves traffic across the ports. Configurable limits reach 8000 MAC addresses and 16000 unicast routes, with resource allocation controlled through switching database templates. Management combines Cisco IOS CLI access with browser-based Cisco Cluster Management Suite and SNMP monitoring. SSH requires a cryptographic software image. STP, RSTP and MSTP support loop-control configurations, while LACP supports negotiated link aggregation. The chassis has no second internal power-supply bay.
Specify WS-C3550-24PWR-SMI as new sealed or certified refurbished, with ORM warranty of up to 3-year extended coverage for new units or up to 1 year for certified refurbished units; 30-day returns cover every condition, terms apply. Refurbished units are inspected and bench-tested, with every powered port tested under load, firmware verified and configurations wiped to factory default. Cisco's original limited lifetime warranty ended with service on May 2, 2011; state condition, quantity and delivery region on the purchase order. POs are accepted, government Net-30 and RMA with advance replacement are available, with regional stock/RMA across the UK, EU, US and MEA.
| Key Specs | Key Spec Values |
|---|---|
Operating System | Cisco IOS |
License Tier | IP Base / SMI |
Port Configuration | 24 x 10/100 inline power / 2 x 1G GBIC |
Stacking | GigaStack / 9 members |
Max Power Draw | 525W |
Lifecycle Status | Cisco support ended May 2, 2011 |
Existing phone and wireless installations using Cisco inline power need endpoint compatibility checks before a spare is ordered. The port power ceiling is 15.4W, but matching the wattage alone does not establish compatibility with the prestandard detection method. Specify the endpoint power requirements and verify the detection method before the PO.
Training and staging benches reproducing an older switching environment can use four hardware egress queues per port to exercise traffic classification and scheduling. Define the traffic classes and queue assignments before assembling the bench, then include the required console connectivity and intended test configuration on the purchase request.
A spare pool supporting existing VLAN configurations needs the same feature scope, not just a matching front panel. The switch supports 128 spanning-tree instances, which is distinct from its VLAN count. Check the saved configuration against that instance limit and record the required software image before ordering.
Gigabit speeds on access ports
The fixed copper access ports operate at 10/100 Mbps. Gigabit connectivity is confined to the GBIC uplink positions, so Gigabit desktop connections exceed the access-port capability.
Standards-only powered endpoint compatibility
Cisco prestandard inline power requires compatible endpoint detection. An endpoint supporting only IEEE 802.3af cannot be qualified by matching its wattage to the port power ceiling.
OSPF with the supplied image
The supplied SMI feature set provides static routing and RIP, not OSPF. Advanced dynamic routing requires the higher EMI feature set and its associated software entitlement.
Active Cisco hardware support coverage
Cisco support for the Catalyst 3550 ended May 2, 2011. A new sealed unit does not restore manufacturer support or extend the retired hardware lifecycle.
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| WS-C3550-24PWR-SMI |  WS-C3550-24PWR-EMI |  WS-C3550-48-EMI |  WS-C3550-24-EMI |  WS-C3550-12T | |
|---|---|---|---|---|---|
| Depth | 440 mm | 440 mm | 413 mm | 366 mm | 403.86 mm |
| Ethernet Technology | Fast Ethernet | Fast Ethernet | Fast Ethernet | Fast 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 1U | Rack-Mount 1.5U |
| Height | 44.5 mm | 44.5 mm | 44.5 mm | 44.5 mm | 67 mm |
| Manufacturer Part Number | WS-C3550-24PWR-SMI | WS-C3550-24PWR-EMI | WS-C3550-48-EMI | WS-C3550-24-EMI | WS-C3550-12T |
| Memory | 64 MB | 64 MB | 64 MB | 64 MB | 64 MB |
| Power Consumption | 525W | 525W | 110W | 65W | 190W |
| Switching Capacity | 8.8 Gbps | 8.8 Gbps | 13.6 Gbps | 8.8 Gbps | 24 Gbps |
| Weight | 6.35 kg | 6.35 kg | 5.9 kg | 5 kg | 7.26 kg |
| Width | 445 mm | 445 mm | 445 mm | 445 mm | 444.5 mm |
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WS-C3550-24PWR-SMI identifies a Catalyst 3550 switch with 24 Fast Ethernet access ports, Cisco inline power and the Standard Multilayer Software Image. WS-C3550 identifies the switch family, 24 identifies access-port quantity, PWR identifies integrated inline power, and SMI identifies the supplied software feature set. Two GBIC uplink positions accompany this configuration.
WS-C3550-24PWR-SMI supports Cisco IOS CLI management through the console or remote sessions, browser-based Cisco Cluster Management Suite, and SNMP-based management. Remote CLI access includes Telnet and SSH, with SSH requiring a cryptographic image. CiscoWorks management tools are also supported, while the installed software image determines the available management and security features.
WS-C3550-24PWR-SMI is retired, and Cisco support for the Catalyst 3550 ended May 2, 2011. Manufacturer service is no longer available for this hardware. A sealed condition does not change that status, so procurement should treat the unit as unsupported legacy equipment rather than a current supported switch.
ORM offers WS-C3550-24PWR-SMI new sealed or certified refurbished, with up to 3-year extended warranty for new units and up to 1 year for certified refurbished units. Returns are available for 30 days on every condition; terms apply. Cisco originally supplied a limited lifetime warranty, but Cisco coverage ended May 2, 2011.
WS-C3550-24PWR-SMI includes SMI, subsequently named IP Base, and supports an authorized upgrade to EMI, subsequently named IP Services. CD-3550-EMI= is the enhanced-image upgrade for Fast Ethernet models. The chassis model label remains the original factory identifier after an upgrade, so the label alone does not establish the running image or entitlement.
The Catalyst 3550 inline-power model supports compatible Cisco prestandard powered devices, with a port power ceiling of 15.4W. Legacy IP phones and wireless access points must support its detection method. An endpoint's stated wattage alone does not establish compatibility, and Cisco inline power must not be treated as universal standards-based PoE.
WS-C3550-24PWR-SMI provides two fixed GBIC-based Gigabit Ethernet uplink positions, not SFP cages or a removable uplink-card bay. Fiber options include WS-G5484= for 1000BASE-SX and WS-G5486= for 1000BASE-LX/LH. Match the transceiver to the fiber connection and remote interface; these positions do not provide 10G connectivity.
Catalyst 3550 GigaStack connects nine switches in a daisy chain, with 1 Gbps forwarding bandwidth; point-to-point operation supports 2 Gbps. Connections use WS-X3500-XL with suitable cabling such as CAB-GS-50CM or CAB-GS-1M. GigaStack occupies GBIC positions, so stacking connections and external uplinks must be planned together.
WS-C3550-24PWR-SMI includes static routing, RIPv1 and RIPv2, making its supplied feature set Layer 2+ under a routing-based classification. OSPF, IGRP, EIGRP and BGPv4 belong to the enhanced image. Hardware route scale does not grant those protocols; the installed feature set and authorized software entitlement determine their availability.
No, WS-C3550-24PWR-SMI does not provide a second internal power-supply bay. Its internal AC supply is fixed, and backup power uses an external redundant-power connection rather than another internal module. The distinction matters when specifying redundancy: an external backup arrangement is not equivalent to dual internal hot-swappable supplies.
WS-C3550-24PWR-SMI supplies Cisco inline power, whereas WS-C3550-24-SMI has non-powered access ports. Both configurations provide 24 Fast Ethernet access connections and two GBIC uplink positions. Both models are discontinued. The powered configuration matches compatible legacy phones or access points; the non-powered configuration matches endpoints using separate power.
WS-C3550-24PWR-SMI includes basic static and RIP routing, whereas WS-C3550-24PWR-EMI includes the enhanced feature set with advanced IP routing. The powered access-port configuration is shared. Both models are discontinued. SMI matches basic routed legacy access requirements; EMI matches existing configurations requiring protocols such as OSPF, EIGRP or BGPv4.
WS-C3550-24PWR-SMI has 24 Fast Ethernet access ports, while WS-C3550-48-SMI has 48. The higher-density model is non-powered, so additional ports do not preserve the inline-power capability. Both models are discontinued. The powered model matches compatible legacy powered endpoints; the 48-port model matches higher-density connections with separately powered devices.
WS-C3550-24PWR-SMI provides 6.6 Mpps forwarding for 64-byte packets and an 8.8 Gbps switching fabric. These figures describe packet forwarding and switching capacity, respectively, rather than endpoint power or uplink speed. Its two Gigabit uplink positions remain distinct from the Fast Ethernet access connections when assessing the intended traffic pattern.
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