Cisco Catalyst WS-C3550-24PWR-EMI Full English Product Description

1. Short Sales Title (For Quotation & E-commerce Listing)

2. Official Product Overview

• PWR: Integrated inline PoE power supply
• EMI (Enhanced Multilayer Image): Full IP services IOS firmware, adding complete unicast/multicast routing protocols, first-hop gateway redundancy, policy-based routing and WCCP absent from SMI lightweight multilayer IOS.
  The chassis uses a fixed internal 525W single AC power supply with a rear dedicated RPS connector compatible with Cisco RPS 675 external redundant power systems to eliminate single power failure risks for mission-critical voice/data converged edge networks.

Model Suffix Breakdown

• 3550: Catalyst 3550 intelligent multilayer stackable platform with native hardware CEF Layer 3 routing
• 24: Twenty-four fixed 10/100 Fast Ethernet RJ45 downlink ports, all PoE-enabled
• PWR: Built-in IEEE 802.3af inline PoE power circuit, total 370W PoE budget
• EMI: Enhanced Multilayer IOS Image, full enterprise Layer 3 routing, multicast and advanced security feature set (SMI only supports static + RIP basic routing)
• Dual GBIC Gigabit uplink slots, dual ISL proprietary + 802.1Q open-standard trunking support

3. Port & Hardware Specifications

• 24 × 10/100BASE-T RJ45 auto-sensing Fast Ethernet access ports, auto MDI-X, IEEE 802.3x full-duplex flow control, IEEE 802.3af PoE (max 15.4W per port)
• Total integrated PoE power budget: 370W built-in PoE supply (supports 24×15.4W PoE Class3 devices simultaneously; PoE priority scheduling prioritizes voice ports during overload)
• Uplink Interfaces: 2 × hot-swappable GBIC Gigabit slots (1000BASE-X), compatible with Cisco GBIC modules: 1000BASE-SX, LX/LH, ZX, 1000BASE-T copper, GigaStack stacking GBIC
• Local Out-of-Band Console: 1×RJ45 RS232 serial console port; no Mini-USB / front USB storage port
• Stacking: GigaStack GBIC stacking, maximum 9 Catalyst 3550 switches per cluster, single unified IP cluster management, Cross-Stack UplinkFast (CSUF) sub-second convergence
• Power architecture: Fixed internal 525W integrated AC power supply, input 100–240 VAC autoranging 50/60Hz; max total system power consumption 525W under full PoE load; rear RPS connector compatible with Cisco RPS 675 external redundant power supply
• Front panel LED indicators: Per-port link/activity, speed, duplex, PoE power delivery status; GBIC media status, stack health, RPS power status, global system fault alarm
• Mounting options: 19-inch 1RU rack-mount brackets included; desktop rubber anti-slip feet supplied
• Thermal design: Variable-speed active fan cooling
• Environmental operating range: 0°C to 45°C (32°F–113°F); storage -25°C to 70°C; relative humidity 10–85% non-condensing
• Safety & EMI certifications: CE, FCC Class A, UL listed, VCCI Class A, RoHS compliant
• Physical dimensions: 445 mm (W) × 44.5 mm (H, 1RU) × 332 mm (D)
• Unit weight: 5.4 kg (11.9 lbs)
• MAC address table capacity: Up to 8,000 unicast MAC entries
• Maximum active VLANs: 250 active IEEE 802.1Q tagged VLANs, full VLAN ID range 1–4094
• Multicast Routes: Up to 2,000 multicast routing entries
• Unicast Layer 3 CEF Routes: Up to 16,000 unicast IPv4 routing entries
• MTBF: 160,000 hours under standard office operating conditions
• Warranty: Original Cisco Limited Lifetime Hardware Warranty (EoS, only third-party refurbished hardware support available)

4. Layer 2 + Full EMI Multilayer IOS Full Feature Set

Core Layer 2 Switching & QoS Core Functions

• Up to 250 active IEEE 802.1Q tagged VLANs, VTPv2 dynamic VLAN synchronization, MSTP 802.1s multiple spanning tree
• Dual trunking standards: Cisco proprietary ISL trunking + IEEE 802.1Q open-standard trunking on both Gigabit uplink ports
• IEEE 802.1p CoS / DSCP multilayer QoS with 4 egress priority queues per port; strict priority scheduling optimized for VoIP voice traffic
• Gigabit EtherChannel link aggregation, up to 8-port bundled trunking for fault tolerance and aggregated backbone bandwidth
• IEEE 802.1D STP + Rapid STP (802.1w), UplinkFast, BackboneFast, BPDU guard, root guard to eliminate Layer 2 switching loops
• Cross-Stack UplinkFast (CSUF) for sub-second convergence across stacked switch topologies
• Port security: Static MAC binding, sticky dynamic MAC learning, port shutdown violation mode
• Per-port broadcast/multicast/unicast storm control to mitigate Layer 2 flooding DoS attacks
• Local SPAN port mirroring + cross-stack RSPAN remote span for multi-switch traffic capture and troubleshooting
• Cisco CGMP (Cisco Group Management Protocol) to suppress unnecessary multicast flooding to access ports
• Voice VLAN, Auto QoS for automatic Cisco IP Phone traffic priority marking
• IEEE 802.3af PoE intelligent management: PoE port priority classification, real-time 370W budget monitoring, automatic low-priority port power shutdown under overload protection
• GigaStack stacking management: Single IP cluster administration for up to 9 stacked switches
• Cisco EnergyWise power management to reduce idle PoE endpoint power draw and cut facility energy cost
• RMON Groups 1,2,3,9 real-time traffic statistics monitoring
• NTP time synchronization for consistent system log timestamps
• CDP Cisco Discovery Protocol for end-to-end network device visibility
• Web-based embedded Device Manager & Cisco CMS Cluster Management Suite for zero-touch initial deployment
• Full IPv6 dual-stack Layer 2 switching: IPv6 Snooping, IPv6 ACLs, IPv6 QoS marking, IPv6 neighbor discovery

Exclusive EMI Enhanced Multilayer Layer 3 Routing Features (Not Included in SMI)

• Hardware accelerated IPv4 / IPv6 inter-VLAN routing via SVI (Switched Virtual Interface)
• Static routing, default route support for campus/branch core uplink forwarding
• Complete interior gateway protocols: RIP v1/v2, OSPF, EIGRP, EIGRPv3 for IPv6
• Exterior gateway protocol: BGPv4 for IPv4 inter-domain routing
• Multicast routing suite: PIM sparse/dense mode, DVMRP tunneling
• First-hop redundancy protocols: HSRP, VRRP for IPv4 and IPv6
• Policy-Based Routing (PBR) for flexible traffic steering
• WCCP v2 web cache redirection support
• Layer 3 ingress / egress access control lists for routed traffic filtering
• Equal-cost multi-path (ECMP) routing for Layer 3 load balancing
• Layer 3 port security and traffic policing for routed edge traffic

Enterprise Advanced Security Features

• IEEE 802.1X port-based NAC authentication with RADIUS/TACACS+ AAA remote access control
• SSHv2 encrypted remote CLI management; SNMPv3 secure encrypted monitoring (unencrypted Telnet/SNMPv1/v2c available as fallback)
• Combined Layer 2 + Layer 3 ingress access control lists (ACLs) for granular inbound traffic filtering
• Time-based ACL traffic policies for scheduled network access restrictions
• Private VLAN edge for isolated host segmentation on shared access ports
• Ingress port bandwidth rate limiting, traffic policing and shaping for both switched and routed traffic
• DHCP Snooping + Dynamic ARP Inspection (DAI) + IP Source Guard to mitigate IP/MAC address spoofing attacks
• Encrypted local user passwords and encrypted startup-config file storage

5. Full Management Interfaces

1. Local Out-of-Band: RJ45 RS232 serial console port for direct CLI access without live network connectivity
2. Secure Remote CLI: SSHv2 encrypted command-line access; fallback password-authenticated Telnet
3. Embedded Web GUI: Lightweight browser-based Cisco Device Manager & CMS Cluster Manager for port, VLAN, QoS and PoE configuration panel
4. SNMP v1/v2c/v3: Encrypted/unencrypted enterprise monitoring compatible with Cisco Prime, DNA Center and third-party NMS platforms
5. Local Storage: 16 MB onboard flash memory to store IOS operating image, startup-config and running-config files (encrypted config storage; no external USB backup port)

6. Integrated Enhanced Security Suite

• Multi-level privilege CLI access with encrypted local user password storage
• IEEE 802.1X port authentication to validate end-user devices before granting LAN access
• Port security to restrict unauthorized end-device MAC addresses per access port
• STP BPDU guard and root guard to block rogue unmanaged switches from corrupting Layer 2 topology
• Broadcast storm control to suppress flooding-based denial-of-service threats
• Private VLAN edge to isolate connected endpoints from each other on shared access ports
• DHCP Snooping + DAI ARP inspection + IP Source Guard to eliminate address spoofing attacks
• SSHv2 and SNMPv3 encryption to secure remote switch management traffic over the LAN
• Manual permanent shutdown of unused ports to reduce unauthorized network attack vectors
• Dedicated management VLAN isolation to segregate switch control plane traffic from end-user data
• PoE overload protection logic to cut power to low-priority PoE+ ports when total power consumption exceeds 370W budget threshold

7. Typical Deployment Scenarios

1. Medium Enterprise Stacked Full-Feature Converged Voice/Data Edge Switch: 24 PoE Fast Ethernet ports power 15.4W Cisco IP phones and single-band Wi-Fi APs; dual GBIC Gigabit uplinks provide fiber trunk connections to building core aggregation switches. GigaStack stacking unifies multiple 3550 switches under one IP address for simplified IT administration, and full EMI Layer 3 routing (OSPF/EIGRP/BGP/HSRP) eliminates standalone router hardware for multi-subnet office segmentation. External RPS redundant power eliminates single power failure risks for mission-critical voice office floors.
2. K-12 Multi-Floor Campus Converged Network: Full 370W PoE budget powers classroom wireless APs, student IP phones and HD security cameras; dual combo Gigabit uplinks provide redundant trunk links to campus backbone for IPTV multimedia teaching traffic. Full PIM multicast routing optimizes video broadcast delivery, MSTP and storm control prevent broadcast loop outages across multi-building VLAN domains.
3. Medium Regional Branch Wiring Closet Main Switch: Universal PoE access ports eliminate separate power injectors for all branch voice, wireless and surveillance devices; dual-media GBIC uplinks support long-distance fiber trunking to corporate headquarters. EMI full routing suite enables multi-subnet branch design with HSRP gateway redundancy, meeting enterprise branch security and routing compliance requirements.
4. Multi-Location Retail Headquarters Aggregation: PoE capacity powers store wireless APs and multi-stream security cameras; dual combo uplink media provides trunk failover paths to retail central data center, PoE power sustains continuous POS and surveillance business operation. Full Layer 3 ACLs isolate payment and security subnets to meet PCI compliance standards.
5. Legacy Enterprise Flat Layer 2 Network Refresh Secondary Edge Hardware: Drop-in replacement for aging Catalyst 3500 XL pure Layer 2 switches, fully compatible with existing ISL trunking legacy core infrastructure, equipped with complete Layer 3 routing to support gradual migration to modern Catalyst 9000 series hardware without intermediate router upgrades.

8. Standard Package Contents

Short Commercial Version (For Quotation & Product Catalog)