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Answer first: the Cisco ISR4331 is an ISR 4000 branch platform whose current suitability depends on lifecycle, required capacity, interfaces, modules, software, licenses, security, support, spares, and migration risk. See the official ISR 4000 data sheet, ISR 4000 lifecycle hub, model comparison, and Catalyst 8200 migration family.
Performance boundary: Cisco publishes aggregate-throughput tiers for the exact platform and license. Encrypted and application throughput depends on IOS XE, packet size, traffic mix, enabled services, interfaces, configuration, and test method.
Product Overview
Specification
| Specification | ISR4331/K9 (Base) | ISR4331-V/K9 (Voice UC Bundle) |
| Aggregate Throughput | 100 Mbps (default) up to 300 Mbps (performance license) | 100 Mbps (default) up to 300 Mbps (performance license) |
| CPU & DRAM | Multicore x86, 4 GB DRAM (up to 16 GB) | Multicore x86, 4 GB DRAM (up to 16 GB) |
| Flash Memory | 4 GB (up to 16 GB) | 4 GB (up to 16 GB) |
| Onboard Ports | 2× 1 GbE RJ-45, 2× 1 GbE SFP | 3× 10/100/1000 Mb/s RJ-45; 2× 1 GbE SFP |
| Module Slots | 2× NIM, 1× Enhanced SM-X, 1× Onboard ISC | 2× NIM, 1× Enhanced SM-X, 1× Onboard ISC |
| Voice DSP | — | PVDM4-32 digital signal processor for voice/video services |
| Security & SD-WAN | Cisco SD-WAN, IPsec, optional NGFW/IPS/AMP via bundles | Cisco SD-WAN, IPsec, NGFW/IPS/AMP included |
| Power Supply | 1× PWR-4330-AC internal, optional PoE converter | 1× PWR-4330-AC internal, optional PoE converter |
| Form Factor | 1 RU rack mount | 1 RU rack mount |
Core Features
- High-Performance Multicore Architecture: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- Flexible Modularity: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- Integrated SD-WAN & Security: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- Pay-As-You-Grow Licensing: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- Trustworthy Solutions: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- Zero-Touch Provisioning: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- IPsec VPN Acceleration: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
- Comprehensive Management: verify the exact PID, IOS XE release, licenses, subscriptions, modules, resources, traffic conditions, current data sheet, lifecycle, and test results before using this capability.
Competitor Comparison
| Feature | Cisco ISR4331 | FortiGate 60F | Juniper SRX300 |
| IPsec VPN Throughput | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. |
| Multicore Architecture | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. |
| Modularity | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. |
| Embedded Security | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. |
| SD-WAN Support | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. |
| Form Factor | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. | Verify the exact current vendor PID, software, license, traffic profile, test method, lifecycle, support, and quote. |
Installation and Setup
Technical Guides
Site Survey & Placement
Assess WAN link types, rack space, and power. Plan NIM/SM-X module types (e.g., LTE, PoE, DSP) and ensure proper airflow clearance.
Core Allocation Modes
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
SD-WAN Configuration
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Security Bundle Activation
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Module Installation (OIR)
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Software Upgrades
Use Cisco DNA Center or:
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Performance Monitoring
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
Command boundary: the original fragment was not validated as a complete workflow. Use the exact PID, IOS XE release, controller mode, licenses, modules, official guide, backup, maintenance window, rollback, and acceptance tests.
CLI Configuration Examples
Enable SD-WAN and Routing Features
Command boundary: the original command fragment was not validated against a complete Cisco configuration guide. Use the exact platform, IOS XE release, controller mode, license, interface map, security policy, change plan, and official documentation for “Enable SD-WAN and Routing Features”.
Create Overlay and VPN Profile
Command boundary: the original command fragment was not validated against a complete Cisco configuration guide. Use the exact platform, IOS XE release, controller mode, license, interface map, security policy, change plan, and official documentation for “Create Overlay and VPN Profile”.
Configure WAN Interfaces
Command boundary: the original command fragment was not validated against a complete Cisco configuration guide. Use the exact platform, IOS XE release, controller mode, license, interface map, security policy, change plan, and official documentation for “Configure WAN Interfaces”.
Apply IPsec Profile to Tunnel
Command boundary: the original command fragment was not validated against a complete Cisco configuration guide. Use the exact platform, IOS XE release, controller mode, license, interface map, security policy, change plan, and official documentation for “Apply IPsec Profile to Tunnel”.
Enable NGFW and Security Policies
Command boundary: the original command fragment was not validated against a complete Cisco configuration guide. Use the exact platform, IOS XE release, controller mode, license, interface map, security policy, change plan, and official documentation for “Enable NGFW and Security Policies”.
Real Case Studies and Scenarios
- Scenario 1 evidence boundary: no customer identity, approval, topology, software, licenses, test method, raw measurements, or audit record was attached. Treat this as a hypothetical design prompt, not a case study, compliance claim, or measured result.
- Scenario 2 evidence boundary: no customer identity, approval, topology, software, licenses, test method, raw measurements, or audit record was attached. Treat this as a hypothetical design prompt, not a case study, compliance claim, or measured result.
- Scenario 3 evidence boundary: no customer identity, approval, topology, software, licenses, test method, raw measurements, or audit record was attached. Treat this as a hypothetical design prompt, not a case study, compliance claim, or measured result.
Frequently Asked Questions (FAQs)
-
What throughput does the Cisco ISR4331 support?
A: Cisco publishes aggregate throughput tiers, but application and encrypted throughput depend on exact PID, performance license, IOS XE release, packet size, traffic mix, enabled services, interfaces, and test method. -
Which ports does the Cisco ISR4331 provide?
A: Verify the exact PID in the current Cisco data sheet. Port count, connector or combo behavior, supported speeds, modules, and LAN or WAN role must match both endpoints. -
Which expansion modules work with the Cisco ISR4331?
A: Confirm the exact NIM, SM-X, ISC, memory, storage, voice, cellular, power, and software compatibility in Cisco documentation; module support is not family-wide. -
Which security services can run on the Cisco ISR4331?
A: Availability and performance depend on IOS XE release, licenses, subscriptions, resources, operating mode, integrations, policy, and current support. Validate with all required services enabled. -
Does the Cisco ISR4331 support SD-WAN?
A: Support depends on exact PID, IOS XE release, licenses, controller mode, certificates, templates, interfaces, topology, and current Cisco documentation. Plan backup and rollback before conversion. -
How should the Cisco ISR4331 be managed and upgraded?
A: Use supported Cisco management and upgrade workflows for the exact release and mode. Record AAA, backups, compatibility, maintenance window, rollback, monitoring, and acceptance tests; no zero-impact result is assumed. -
Is the Cisco ISR4331 still supported?
A: Cisco lists ISR4331 in an end-of-sale product family; exact milestones and entitlement depend on the PID. Check the official lifecycle page before retaining, purchasing, or migrating it. Compare the Catalyst 8200 family only after documenting interfaces, modules, throughput, services, licenses, rack, power, and migration requirements.
Conclusion
The Cisco ISR4331 can remain appropriate only when the exact PID still meets documented lifecycle, capacity, interface, module, software, license, security, operations, support, spares, and business-risk requirements. Compare this model page with current router options.
Selection boundary: validate licensed capacity, active services, modules, software support, lifecycle, and measured requirements before retaining or sourcing this platform.
Operations boundary: controller integration and provisioning depend on supported software, licenses, certificates, templates, connectivity, and an approved rollout and rollback plan; no cost or policy outcome is assumed.
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