Cisco ISR4221X/K9 Integrated Services Router (4000 ISR Series) Full Product Description

1. Short Overview

Naming & Variant Breakdown

• ISR4221X/K9: Base AC-powered enhanced router with universal IOS XE image, embedded K9 AES/3DES crypto hardware, default 35 Mbps multi-service throughput
• ISR4221X-SEC/K9: Pre-bundled Security license variant (Zone-Based Firewall, IOS IPS, full IPsec/SSL/DMVPN/GETVPN suite pre-activated)
• ISR4221X-AX/K9: Advanced Services bundle supporting SRE virtualization, WAAS wide-area deduplication, centralized DNA Center analytics
• ISR4221X-DC/K9: 24–60V negative DC autoranging telecom-grade power model for central office cabinet deployments
• -RF / -WS: Refurbished / Warranty Service SKU derivatives

Core Differentiators vs Standard ISR4221/K9

1. Enhanced multi-core x86 processor with larger crypto pipeline, higher CEF-only forwarding throughput up to 1.2 Gbps vs ~800 Mbps on base 4221
2. Optimized data-plane memory partitioning for concurrent security, SD-WAN, and virtualized workloads
3. Improved maximum concurrent IPsec tunnel capacity (up to 350 tunnels at full 75 Mbps performance license vs 300 on standard 4221)
4. Identical physical chassis, slot layout, port configuration, external AC power supply, 1RU rack form factor
5. Same fixed 4GB ECC DDR3 DRAM, 8GB max CompactFlash storage, 2 NIM slots, 1 ISC internal service slot, dual USB 2.0, triple out-of-band management ports
6. No native Unified Communications DSP support (CME/SRST voice features unsupported on all ISR4221 family)
7. No built-in PoE; PoE only available via external injectors or dedicated switch NIM modules

2. Hardware Interface & Physical Specifications

Modular Expansion Slots

1. 2 × NIM (Network Interface Module) universal rear slots
   Supports single-wide NIM modules for flexible WAN, access, and wireless upgrades; no double-wide NIM-D support on ISR4221X:

• Broadband: NIM-ADSL2+, NIM-VDSL2, NIM-G.SHDSL
• Serial/T1/E1: NIM-2T1, NIM-4E1, NIM-2B-S/T serial interface cards
• Wireless: NIM-4G-LTE global/NA/ST cellular backup WAN
• Switching: NIM-4GE EtherSwitch module for on-site LAN and IP phone access
• Auxiliary: NIM encryption, intrusion detection auxiliary modules

1. 1 × ISC (Integrated Services Card) internal slot
   Accommodates lightweight SSD storage drives for SRE virtualization logs, WAAS deduplication data, or auxiliary application offloading; no large SM service modules supported.

Built-in Rear Physical Ports

1. 2 × 10/100/1000BASE-T Gigabit RJ45 (GE0/0, GE0/1) + 1 shared SFP mini-GBIC fiber slot
   The SFP port shares hardware with GE0/0; activating an SFP fiber transceiver disables the corresponding RJ45 copper port. All Gigabit ports fully support IEEE 802.1Q VLAN trunking, inter-VLAN routing, LACP link aggregation for segmented corporate, guest, and payment subnets.
2. Primary RJ45 Serial Console port (115200 baud standard out-of-band CLI management)
3. Mini-USB Type-B secondary Console port for lightweight cable-free local configuration
4. RJ45 AUX port for remote dial-in emergency access via analog PSTN modem
5. 2 × USB 2.0 Type-A ports: High-speed offline config backup, logging storage, two-factor crypto authentication tokens
6. Removable 8GB CompactFlash storage slot (fixed max 8GB capacity, non-upgradeable)
7. External DC power jack (12V input via external AC power brick; no internal hot-swappable PSU, no native RPS support)
8. Chassis ground terminal + Kensington security lock slot for physical rack anti-theft protection

Memory & Performance Benchmarks

• Processor: Enhanced multi-core x86 architecture with dedicated embedded AES-256/3DES crypto hardware offload engine (upgraded pipeline vs base ISR4221)
• DRAM: Fixed 4GB ECC DDR3 (soldered single memory bank, non-upgradeable, shared control/data/services plane)
• Flash: Factory 8GB CompactFlash (maximum supported capacity, no dual CF redundancy)
• Aggregate multi-service throughput: Base 35 Mbps; upgradeable to 75 Mbps via permanent performance license
• CEF pure forwarding throughput: Up to 1.2 Gbps wire-speed for plain routing workloads
• Maximum concurrent IPsec/DMVPN tunnels: Up to 350 tunnels at full 75 Mbps licensed throughput
• Supported IOS XE releases: IOS XE 16.x, 17.x universal consolidated images; all feature access controlled via permanent chassis-bound licenses
• Voice capacity: No PVDM DSP slots; CME, SRST, and full Unified Communications voice services are unsupported on ISR4221X/K9

Physical & Power Parameters

• Rack form factor: 1RU standard 19-inch EIA rack mount, wall-mount capable
• Dimensions (H × W × D): 43.7 × 322.6 × 254 mm (1.72 × 12.7 × 10 inches)
• Empty chassis weight (no NIM/ISC modules): 3.22 kg (7.1 lbs)
• Power supply: External autoranging AC brick (100–240V 50/60Hz input, 90W maximum output)
• Typical power consumption: 24W idle, max 60W with full populated NIM module load
• PoE capability: No native chassis PoE; PoE power for IP phones only via separate EtherSwitch NIM modules or external injectors
• Operating environmental specifications
  • Operating temperature: 0°C to +40°C at altitude below 1800m; performance derated above 1800m
  • Relative humidity: 5%–85% non-condensing
• MTBF: 593,270 hours under standard factory operating conditions

3. IOS XE Universal Feature Suite

Core Routing & Multi-WAN Connectivity

• Full dual-stack IPv4 / IPv6 routing suite: Static routes, RIP v1/v2, OSPF, EIGRP, BGP, IS-IS, PIM multicast suite, BFD bidirectional fast failure detection
• WAN encapsulation protocols: PPP, HDLC, Frame Relay, ATM, ISDN, PPPoE/PPPoA for DSL, DDR backup failover, MPLS L2/L3 VPN, GETVPN
• Native Cisco SD-WAN Viptela support: Zero-touch provisioning, centralized policy orchestration, hybrid broadband/cellular/MPLS multi-link WAN architecture
• NAT services: Static NAT, dynamic PAT, multi-address NAT pools, NAT64 IPv6-to-IPv4 translation for cloud SaaS connectivity
• Layer 2 switching features: IEEE 802.1Q VLAN trunking, LACP link aggregation, storm control, port security, MAC address filtering

Integrated Security Suite (Activated via SL-4200-SEC-K9 License)

1. Zone-Based Stateful Firewall (ZBFW): Deep Layer 7 application inspection for HTTP, HTTPS, SIP, FTP, DNS, and mainstream enterprise business protocols
2. IOS IPS inline intrusion prevention: Signature-based threat detection, automated packet drop/reset, centralized threat logging
3. Hardware-accelerated VPN stack: AES-256/3DES IPsec site-to-site tunnels, DMVPN hub-spoke overlay networks, SSL VPN remote client access, GETVPN
4. AAA security framework: Local/RADIUS/TACACS+ authentication, authorization, accounting logging for audit compliance
5. Advanced threat mitigation: Anti-DDoS policing, control-plane protection, URL filtering, malware traffic inspection
6. FIPS 140-2 Level 2 compliant with optional physical security shield kit for government regulated deployments

QoS & WAN Optimization

• Base QoS functions: CBWFQ, weighted fair queuing, per-interface traffic shaping, strict priority queuing for real-time voice/video traffic
• Advanced QoS (SL-4200-DATA-K9 license): LLQ low-latency queuing, DSCP marking/classification, NBAR2 next-generation application-aware traffic prioritization
• WAN optimization (SL-4200-AX-K9 license): WAAS bandwidth deduplication, compression, traffic shaping for long-distance low-speed branch links
• Link efficiency tools: LFI link fragmentation, cRTP VoIP header compression to eliminate voice jitter on DSL/ISDN backup lines

Management & Automation

• Triple out-of-band management interfaces: RJ45 Serial Console, Mini-USB Console, AUX dial-in modem port for emergency offline IT maintenance
• Secure remote management: SSHv2, HTTPS, SNMP v1/v2c/v3, TR-069 zero-touch automated provisioning for multi-branch rollouts
• Graphical management tools: Cisco Configuration Professional (CCP), DNA Center SD-WAN orchestration, vManage Viptela SD-WAN controller
• File management: AutoInstall remote IOS/image deployment, CompactFlash dual boot redundancy, USB config backup/restore workflow
• Monitoring and logging: Persistent syslog logging, NTP time synchronization, real-time CPU/memory/throughput telemetry export
• Cisco EnergyWise: Intelligent power control for attached IP phones, access switches, and wireless access points

4. Typical Deployment Scenarios

1. Small enterprise SD-WAN branch gateway: Dual NIM slots deployed for VDSL2 primary broadband + 4G LTE cellular backup, shared SFP fiber uplink for metro Ethernet WAN, embedded DMVPN connecting remote branch to corporate data center, zone firewall for LAN security, centralized DNA Center policy orchestration.
2. Retail store multi-location remote router: ADSL2+ NIM primary WAN, NIM-4GE EtherSwitch module for in-store POS terminals, PCs, and Wi-Fi access points, SD-WAN zero-touch provisioning for chain-wide deployment, PCI DSS compliant IPS threat protection for payment card environments.
3. Small agency remote office edge router: SFP fiber uplink for high-speed metro Ethernet, 75 Mbps performance license upgrade for heavy cloud/SaaS traffic, SSL VPN for remote employee home access, WAAS bandwidth optimization via ISC SSD module for limited-capacity inter-office links.
4. Entry-level enterprise networking training lab router: Modular NIM expansion for DSL, T1/E1, and cellular WAN training labs, dual console ports for simultaneous student management access, full IOS XE routing/security/SD-WAN feature set aligned with enterprise certification curricula.

5. Standard Package Contents of ISR4221X/K9

Separately Sold Optional Accessories

• NIM modular WAN/switch/cellular interface cards (ADSL/VDSL/T1/E1/4G LTE/EtherSwitch)
• ISC internal SSD storage modules for WAAS deduplication and SRE virtualization workloads
• SFP fiber transceivers (GE-SX/LX/ZX for fiber uplink connectivity)
• External PoE power injectors for non-PoE IP phones and wireless APs
• External redundant power supply (RPS) unit for mission-critical high-availability branch deployments
• FIPS physical security shield kit for FIPS 140-2 Level 2 government compliance
• Permanent performance upgrade license (35 Mbps → 75 Mbps throughput boost)
• SL-4200-SEC-K9 security add-on license bundle
• SL-4200-AX-K9 advanced services WAAS/virtualization license bundle

Software Licensing Information

1. SL-4200-DATA-K9 (Base Data License)
   Core routing, dual-stack IPv6, MPLS, advanced QoS, NBAR2 application classification, native SD-WAN base functionality, EnergyWise power management, basic NAT/VLAN switching features.
2. SL-4200-SEC-K9 (Security Add-on License)
   Zone-based stateful firewall, IOS inline IPS, full AES/3DES IPsec/SSL/DMVPN encryption suite, advanced threat mitigation, anti-DDoS policing, FIPS crypto support.
3. SL-4200-AX-K9 (Advanced Services License)
   WAAS wide-area bandwidth deduplication optimization, SRE virtualized application hosting, centralized DNA Center advanced orchestration, high-volume logging and traffic analytics.
   Embedded onboard K9 crypto hardware complies with US ITAR export regulations for global shipment. Unified Communications (CME/SRST) voice licenses and PVDM DSP voice modules are fully unsupported on the ISR4221X platform.

Short Commercial Catalog Summary