Cisco 4000 Series Integrated Services Routers
| Overview | Product Overview |
|---|---|
| Product Type | Branch Routers |
| Status |
End of Sale
EOL Details
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| Series Release Date | 16-SEP-2014 |
| End-of-Sale Date | 20-JAN-2025 |
| End-of-Support Date | 31-JAN-2030 |
| Diagram | Visio Stencil (5 MB .zip file) |
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This product is supported by Cisco, but is no longer being sold.
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- US/Canada 800-553-2447
- Worldwide Support Phone Numbers
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- 4221 Integrated Services Router
Status: End of Sale | End-of-Support Date: 30-Nov-2028
- 4321 Integrated Services Router
Status: End of Sale | End-of-Support Date: 30-Nov-2028
- 4331 Integrated Services Router
Status: End of Sale | End-of-Support Date: 30-Nov-2028
- 4351 Integrated Services Router
Status: End of Sale | End-of-Support Date: 30-Nov-2028
- 4431 Integrated Services Router
Status: End of Sale | End-of-Support Date: 30-Nov-2028
- 4451-X Integrated Services Router
Status: End of Sale | End-of-Support Date: 30-Nov-2028
- 4461 Integrated Services Router
Status: End of Sale | End-of-Support Date: 31-Jan-2030
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Recent Security Notices
- 15-Oct-2025
- 07-May-2025
- 20-Dec-2024
- 25-Sep-2024
- 22-May-2024
Document Categories
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Data Sheets and Product Information
- Cisco 4000 Family Integrated Services Router Data Sheet
- Cisco SM-X Based Layer 2 Switching Module Data Sheet
- Cisco Packet Voice Digital Signal Processor Modules (PVDMs) for Cisco Unified Communications Solutions
- Cisco 4000 Series Integrated Services Router Gigabit Ethernet WAN Modules Data Sheet
- Cisco Multimode G.SHDSL Network Interface Module Data Sheet
- Asynchronous Terminal Server Interface Modules for Cisco 4000 Series Integrated Services Routers Data Sheet
- High-Density Analog Voice and Fax Service Modules for Cisco 4000 Series ISRs Data Sheet
- Cisco 4-Port, 8-Port, and 8-Port with PoE/PoE+ Gigabit Ethernet LAN Switch Network Interface Modules Data Sheet
- Cisco 2- and 4-Port ISDN BRI S/T Network Interface Modules Data Sheet
- Analog Voice Network Interface Modules for Cisco 4000 Series ISRs Data Sheet
- Cisco 4G LTE 2.5 Network Interface Modules Wireless WAN Interface Cards for Asia, Australia, and Selected Latin America Regions
- Cisco LTE Advanced 3.0 Network Interface Modules Wireless WAN Interface Cards
- Cisco 4G LTE 2.0 Network Interface Modules
- Cisco Snort IPS for 4000 Series Integrated Services Routers Data Sheet
- Cisco Multimode VDSL2 and ADSL2/2+ Network Interface Module Data Sheet
Data Sheets
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.17.x
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.15.x
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.9.x
- End-of-Sale and End-of-Life Announcement for the Cisco ISR4461 Series Platform
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.16.x
- End-of-Sale and End-of-Life Announcement for the Cisco ISR4200, ISR4300 and select ISR4400 Series Platform
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.12.x
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.14.x
- End-of-Sale and End-of-Life Announcement for the Cisco CAT 6 Network Interface Modules (NIMs)
- End-of-Sale and End-of-Life Announcement for the Cisco 4G DRAM (1 x 4G) for Cisco ISR 4300 Series Routers
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.13.x
- End-of-Sale and End-of-Life Announcement for the Cisco ISR4200, ISR4300 and select ISR4400 Series Platform Spares
- End-of-Sale and End-of-Life Announcement for the Cisco ISR4200 and ISR4300 Series Platform for Brazil
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.11.x
- End-of-Sale and End-of-Life Announcement for the Cisco IOS XE 17.10.x
End-of-Life and End-of-Sale Notices
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Security Notices
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Applicable to Multiple Models
- Field Notice: FN64253 - ISR4331, ISR4321, ISR4351 and UCS-E120 Might Fail After 18 Months or Longer Due to Clock Signal Component Failure - Replace on Failure
- Field Notice: FN74146 - Limited Number of Cisco Catalyst Routers Can Experience Memory Failures - Hardware Upgrade Available
- Field Notice: FN72510 - Cisco IOS XE Software: Weak Cryptographic Algorithms Are Not Allowed by Default for IPsec Configuration in Certain Cisco IOS XE Software Releases - Configuration Change Recommended
- Field Notice: FN72323 - Cisco IOS XE Software: QuoVadis Root CA 2 Decommission Might Affect Smart Licensing, Smart Call Home, and Other Functionality - Software Upgrade Recommended
- Field Notice: FN72578 - Cisco IOS XE - Smart Licensing Using Policy Might Cause High CPU/Memory Usage - Software Upgrade Recommended
- Field Notice: FN - 72265 - Expired PKI Certificate on vEdge, ISR, and ASR Routers Causes SD-WAN Umbrella DNS Connections to Fail - Software Upgrade Recommended
- Field Notice: FN - 64153 - ASR1000 - Inaccurate Power Supply Unit Status - Software Upgrade Recommended
- Field Notice: FN - 63938 - ISR4451X/K9 & ISR4431/K9 - Silent "PowerON" Reload - CPLD Update Required - Software Upgrade Recommended
- Field Notice: FN - 64190 - Cisco IOS XE - Show commands on Cisco IOS XE based platforms might not report true platform memory usage - Software Upgrade Recommended
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Cisco 4431 Integrated Services Router
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Cisco 4331 Integrated Services Router
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Cisco 4321 Integrated Services Router
- Field Notice: FN - 70335 - ISR-WAAS-200 Deployed on an ISR-4321 Router with Cisco IOS XE Release 16.7 or Earlier Might Experience High Memory Utilization - Software Upgrade Recommended
- Field Notice: FN - 70288 - ISR-WAAS Does Not Deploy Successfully on an ISR-4321 Router Installed with Cisco IOS XE Software Release 16.9.x - Software Upgrade Recommended
- Field Notice: FN - 64321 - Network Interface Module Functionality Issue with Cisco IOS Releases Earlier than IOS-XE 16.5 - Software Upgrade Recommended
Field Notices
- Multiple Cisco Products Snort 3 MIME Denial of Service Vulnerabilities
- Cisco Unified Threat Defense Snort Intrusion Prevention System Engine for Cisco IOS XE Software Security Policy Bypass and Denial of Service Vulnerability
- Multiple Cisco Products Snort 3 HTTP Intrusion Prevention System Rule Bypass Vulnerability
- Multiple Cisco Products Snort FTP Inspection Bypass Vulnerability
- Multiple Cisco Products Snort Application Detection Engine Policy Bypass Vulnerability
- Multiple Cisco Products Snort Modbus Denial of Service Vulnerability
- Multiple Cisco Products Snort Memory Leak Denial of Service Vulnerability
- Multiple Cisco Products Server Name Identification Data Exfiltration Vulnerability
- Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerabilities
- Multiple Cisco Products Snort TCP Fast Open File Policy Bypass Vulnerability
- Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability
- Multiple Cisco Products Snort Ethernet Frame Decoder Denial of Service Vulnerability
- Multiple Cisco Products SNORT HTTP Detection Engine File Policy Bypass Vulnerability
- Multiple Cisco Products Snort HTTP Detection Engine File Policy Bypass Vulnerability
- Cisco Secure Boot Hardware Tampering Vulnerability
Security Advisories, Responses and Notices
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Release and Compatibility
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Dublin 17.12.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Cupertino 17.9.x
- Release Notes for Cisco 4000 Series ISRs, Release 17.18.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE 17.15.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE 17.16.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Bengaluru 17.6.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE 17.14.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE 17.13.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Amsterdam 17.3.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Dublin 17.11.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Dublin 17.10.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Cupertino 17.8.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Cupertino 17.7.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Bengaluru 17.5.x
- Release Notes for Cisco 4000 Series ISRs, Cisco IOS XE Bengaluru 17.4.x
Release Notes
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Reference
- Cisco SD-Routing Command Reference
- Programmability Command Reference, Cisco IOS XE 17.16.x
- Programmability Command Reference, Cisco IOS XE 17.15.x
- Programmability Command Reference, Cisco IOS XE 17.13.x
- Cisco IOS Interface and Hardware Component Command Reference
- Programmability Command Reference, Cisco IOS XE Dublin 17.12.x
- Programmability Command Reference, Cisco IOS XE Dublin 17.11.x
- Programmability Command Reference, Cisco IOS XE Dublin 17.10.x
- Programmability Command Reference, Cisco IOS XE Cupertino 17.9.x
- Programmability Command Reference, Cisco IOS XE Cupertino 17.8.x
- Programmability Command Reference, Cisco IOS XE Cupertino 17.7.x
- Programmability Command Reference, Cisco IOS XE Bengaluru 17.6.x
- Programmability Command Reference, Cisco IOS XE Bengaluru 17.5.x
- Programmability Command Reference, Cisco IOS XE Bengaluru 17.4.x
- Cisco IOS Dynamic Application Policy Routing Command Reference
Command References
- Documentation Roadmap for the Cisco 4000 Series ISRs, Cisco IOS XE 3S
- Documentation Roadmap for Cisco 4000 Series ISRs, Cisco IOS XE Denali 16.x
- Documentation Roadmap for Cisco 4000 Series ISRs, Cisco IOS XE Denali 16.x
- Documentation Roadmap for the Cisco 4000 Series ISRs, Cisco IOS XE 3S
Documentation Roadmaps
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Cisco 4451-X Integrated Services Router
- Open Source Used in Cisco ISR 4451-X (PDF - 844 KB)
- Implement Performance License for Integrated Service Router 4000
- Open Source Used in Web UI Cisco IOS XE 6.7.1 (PDF - 750 KB)
- Open Source Used in Cisco 4221 ISR (PDF - 3 MB)
- Cisco_IOS_XE_Denali_16_3_v1 (PDF - 785 KB)
- Open Source Used in Cisco IOS XE Denali Release 16.x (PDF - 780 KB)
Licensing Information
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Cisco 4451-X Integrated Services Router
Technical References
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Design
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Install and Upgrade
- Upgrading Field-Programmable Hardware Devices for Cisco 4000 Series ISRs
- IP Addressing: NAT Configuration Guide, Cisco IOS XE Gibraltar 16.10.x
- Regulatory Compliance and Safety Information—Cisco Voice Gateway 400 and Voice Gateway 450 (PDF - 3 MB)
- Cisco VG450 Voice Gateway Hardware Installation Guide
- Regulatory Compliance and Safety Information—Safety Warnings for Cisco 4000 Series ISRsInformation sur la réglementation de la conformité et de sécurité—Safety Warnings for Cisco 4000 Series ISRs (PDF - 5 MB)
- Cisco VG400 Voice Gateway Hardware Installation Guide
- Installing the Cisco G.SHDSL Network Interface Module
- Regulatory Compliance and Safety Information for Cisco 4000 Series Integrated Services Routers
- Installing the Cisco VDSL2 and ADSL2/2+ Network Interface Modules
- Upgrading Flash Memory for Cisco 4000 Series ISRs
- Cisco Fourth-Generation LTE Network Interface Module Installation Guide
- Hardware Installation Guide for Cisco 4000 Series Integrated Services Routers
Install and Upgrade Guides
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Configuration
- Configure Integrated Services Routers 4000 Series Digital Voice
Configuration Examples and TechNotes
- Cisco Unified Border Element Configuration Guide - Cisco IOS XE 17.6 Onwards
- Programmability Configuration Guide, Cisco IOS XE 17.16.x
- Segment Routing Configuration Guide, Cisco IOS XE 17 | Access and Edge Routers
- Cisco 4000 Series ISRs Software Configuration Guide, Cisco IOS XE 17
- Programmability Configuration Guide, Cisco IOS XE 17.15.x
- Security Configuration Guide for SD-Routing Devices
- Cloud Infrastructure on SD-Routing Devices
- Network Services Configuration Guide, Cisco IOS XE 17.x
- Programmability Configuration Guide, Cisco IOS XE 17.13.x
- IP Switching Cisco Express Forwarding Configuration Guide, Cisco IOS XE Gibraltar 16.10.x
- Cisco ASR 1000 Series Modular Ethernet Line Card Software Configuration Guide, Cisco IOS XE Gibraltar 17.x
- System Management Configuration Guide, Cisco IOS XE 17.x
- Programmability Configuration Guide, Cisco IOS XE Dublin 17.12.x
- Programmability Configuration Guide, Cisco IOS XE Dublin 17.11.x
- Programmability Configuration Guide, Cisco IOS XE Dublin 17.10.x
Configuration Guides
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Maintain and Operate
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Troubleshooting
- System Message Guide for Cisco IOS XE 17.18.x
- System Message Guide for Cisco IOS XE 17.17.x
- System Message Guide for Cisco IOS XE 17.16.x
- System Message Guide for Cisco IOS XE 17.15.x
- System Message Guide for Cisco IOS XE 17.14.x
- System Message Guide for Cisco IOS XE 17.13.x
- System Message Guide for Cisco IOS XE Dublin 17.12.x
- System Message Guide for Cisco IOS XE Dublin 17.11.x
- System Message Guide for Cisco IOS XE Dublin 17.10.x
- System Message Guide for Cisco IOS XE Cupertino 17.9.x
- System Message Guide for Cisco IOS XE Cupertino 17.8.x
- System Message Guide for Cisco IOS XE Cupertino 17.7.x
- System Message Guide for Cisco IOS XE Bengaluru 17.6.x
- System Message Guide for Access and Edge Routers, Cisco IOS XE Bengaluru 17.5.x
Error and System Messages
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Cisco 4451-X Integrated Services Router
Troubleshooting Guides
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Cisco 4461 Integrated Services Router
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Cisco 4431 Integrated Services Router
- Troubleshoot 4000 Series ISR for Issues with ROMMON
- Critical Temperature Condition is Observed
- Monitor CPU Usage on ISR4300 Series
- ISR-WAAS Installation Guide on ISR 4000 Series Router
- Deploy Diagnostic Signatures on ISR, ASR, and Catalyst Network Devices
Troubleshooting TechNotes
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Literature
- Miercom Performance Analysis: Cisco 4000 Series ISRs (PDF - 878 KB)
- Cisco 4000 Series Integrated Services Routers: Architecture for Branch-Office Agility (PDF - 971 KB)
White Papers
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