Cisco AIR-WLC2125-K9 Full English Product Description
1. Short Official Part Label
AIR-WLC2125-K9: Cisco 2100 Series Wireless LAN Controller, 1U Rackmount Unified WLC, Permanent Built-In License to Manage Up to 25 Cisco Lightweight Aironet APs, 8×10/100 Fast Ethernet Ports (2 Ports Support IEEE 802.3af PoE), High-Capacity SMB & Enterprise Branch Wireless Controller, Core Component of Cisco Unified Wireless Network (CUWN) Architecture, Discontinued End-of-Sale Legacy Hardware Platform
2. Full Product Overview
The Cisco AIR-WLC2125-K9 is the highest-capacity model within the legacy Cisco 2100 WLC family, engineered for large remote enterprise branches, multi-location retail chains, mid-sized school campuses, medium hospitality venues and dense SMB offices that require centralized lightweight AP management with greater scale than AIR-WLC2106 (6 AP) and AIR-WLC2112 (12 AP) variants. As a foundational CUWN hardware device, it establishes CAPWAP/LWAPP data tunnels to all joined lightweight APs to deliver centralized RF orchestration, unified enterprise wireless security, seamless Layer 2/3 client mobility, integrated guest access and enterprise-grade VoWLAN voice over Wi-Fi functionality.
This controller ships with a permanent hard license supporting up to 25 lightweight APs without additional upgrade entitlements. It integrates an embedded 8-port Fast Ethernet switch, with ports 7 and 8 providing native 802.3af PoE output to directly power connected APs, eliminating the need for external PoE injectors for on-site deployments. Its architecture is PCI DSS validated, making it ideal for retail environments deploying wireless POS payment terminals.
This hardware platform reached Cisco End-of-Sale (EoS) on October 7, 2020 and End-of-Support (EoL) status; all available stock consists of surplus, used or certified refurbished units. It is only compatible with legacy Aironet lightweight AP generations including 1100, 1200, 1300, 1400, 1500 and early 802.11n access points. Standalone administration is available via local HTTPS web GUI, SSH/Telnet CLI or RS-232 serial console; centralized multi-controller fleet management is supported through the legacy Cisco Wireless Control System (WCS) platform.
3. Complete Hardware Physical & Interface Specifications
Form Factor & Mechanical
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Rack Form Factor: 1U standard 19-inch rack-mount chassis
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Dimensions: 4.45 cm (H) × 20.04 cm (W) × 17.45 cm (D) / 1.75 × 7.89 × 6.87 inches
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Unit Weight: 4.0 lbs (1.81 kg) with integrated internal AC power supply
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Thermal Design: Built-in internal cooling fan for continuous stable operation under rated temperature range
Rear Panel Interfaces
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8× 10/100 Mbps RJ45 Fast Ethernet switch ports (Ports 1–6 standard data; Ports 7 & 8 deliver IEEE 802.3af PoE power output for lightweight APs)
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DB-9 RS-232 serial console port (rollover RJ45 cable included for out-of-band initial configuration and recovery)
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Physical security lock slot for anti-theft cable attachment
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Integrated universal AC power input jack (no separate external power brick required)
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Reserved USB and SSC security card slots (non-functional on the 2125 platform)
Front Panel LED Status Indicators
Global status LEDs: Power, System Health, Critical Alarm, Total Joined AP Count
Per-port Link/Activity status LEDs for all 8 Fast Ethernet interfaces
Power & Environmental Specifications
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Input Power: Universal AC 100–240 VAC, 50/60 Hz
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PoE Power Budget: Limited power capacity to support up to two PoE-powered lightweight APs via ports 7 and 8
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Heat Dissipation: 72 BTU/hour
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Operating Temperature: 0°C to 40°C (32°F to 104°F)
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Storage Temperature: -25°C to 70°C (-13°F to 158°F)
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Humidity: 10%–95% non-condensing for operation and storage
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Regulatory Certifications: UL 60950-1 safety, CE, FCC Class B EMC, ICES-003, VCCI, basic NEBS compliance
4. Official Capacity & Performance Benchmarks
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Maximum Supported Lightweight APs: 25 (hard permanent license limit, non-upgradable)
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Maximum Concurrent Wireless Client Stations: Up to 2000 total across all managed APs
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Switching Capacity: Wire-rate 100 Mbps Fast Ethernet switching
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Roaming Capability: Seamless Layer 2 intra-controller roaming; Layer 3 inter-VLAN client mobility
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Supported Unique SSIDs: Up to 16 broadcast/hidden SSIDs per controller
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RRM Radio Management: Automatic channel selection and dynamic transmit power adjustment for 2.4 GHz and 5 GHz 802.11a/b/g/n radios
5. Core Wireless & Security Feature Suite
1. Centralized Lightweight AP Lifecycle Management
CAPWAP/LWAPP tunnel termination for all connected APs; single-pane bulk firmware upgrades, unified RF configuration and global policy deployment across all 25 managed access points; zero-touch AP auto-discovery via DHCP Option 43. Supports up to 50 AP groups for segmented policy controlCisco.
2. Enterprise-Grade Wireless Security Stack
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Authentication: IEEE 802.1X, EAP-TLS, PEAP, EAP-FAST, local internal user database, external RADIUS AAA server integration
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Encryption Protocols: WEP, WPA, WPA2-PSK/Enterprise (802.11i RSN), TKIP, AES-CCMP
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Threat Mitigation: Rogue AP detection, classification and containment, wireless client isolation, MAC address filtering, dynamic VLAN assignment per SSID, 802.1Q trunk tagging
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Compliance: PCI DSS validated architecture for retail wireless payment deployments
3. Mobility & Voice Over Wi-Fi (VoWLAN)
Fast secure roaming with 802.11r pre-authentication, zero-drop intra-controller client roaming, Wi-Fi Multimedia (WMM) QoS prioritization for VoIP handsets, configurable per-client bandwidth policing.
4. Radio Resource Management (RRM)
Continuous RF interference monitoring, dynamic transmit power control, auto-channel assignment, wireless coverage hole detection and spectrum analysis for 2.4 GHz and 5 GHz bands.
5. Multi-Method Device Management
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Local HTTPS web GUI for standalone monitoring and configuration
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Command-line access via SSH v2, Telnet or serial console
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SNMP v1/v2c/v3 & RMON for third-party NMS monitoring integration
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Persistent secure syslog export for security audit and event tracking
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Centralized multi-controller orchestration via legacy Cisco Wireless Control System (WCS)
6. Isolated Guest Wireless Services
Dedicated guest SSID segmentation, customizable web splash-page authentication, time-limited guest user access credentials, isolated guest VLANs to separate visitor traffic from internal corporate assets.
6. Typical Deployment Scenarios
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Large enterprise remote branch offices deploying up to 25 wireless access points
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Chain retail locations, multi-room medical clinics and full K-12 satellite classrooms
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Mid-sized hospitality venues, hotels and resorts with medium-density wireless coverage
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SMB office wireless consolidation with integrated PoE ports to eliminate external power injectors
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IT lab training environments, legacy CUWN network upgrade staging and temporary large-scale event wireless networks
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Medium-density warehouse campuses requiring centralized RF control and seamless cross-floor client roaming
7. Short Sales Listing Tagline
Cisco AIR-WLC2125-K9 Legacy 1U Rackmount Top-Tier 2100 Series Wireless LAN Controller, Licensed for Max 25 Lightweight Aironet APs, 8×10/100 Fast Ethernet Ports with Dual 802.3af PoE Ports, Unified CUWN Wireless Architecture, WPA2/802.1X Enterprise Security, RRM Intelligent RF Management, Seamless Layer 2/3 Client Roaming, Web GUI/SSH/SNMP Managed, EoS High-Capacity WLC for Large Enterprise Branches & Multi-Location Retail Deployments
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