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Answer first: compare ISR4321, ISR4331, ISR4431, and ISR4461 by exact PID, lifecycle, licensed aggregate throughput, interfaces, modules, software, enabled services, support, spares, and migration risk. Cisco lists these models in an end-of-sale family. Use the official data sheet, ISR lifecycle hub, this comparison, and Catalyst 8200 migration family.
Method boundary: the original article did not attach raw performance tests, configurations, licenses, packet sizes, traffic mixes, timestamps, or reviewer records. The preserved sections therefore provide a verification framework, not an independent benchmark or universal recommendation.
Introduction: Comparing Cisco ISR Models
Lifecycle boundary: Cisco lists ISR 4000 as end of sale, with last-support dates that vary by model. Suitability depends on active entitlement, supported software, vulnerabilities, capacity, hardware health, spares, and a documented migration plan.
In this comparison, we’ll break down the following features:
- Processing power and bandwidth
- Scalability and expansion options
- Security features
- Management and monitoring tools
- Best use cases for each model
By the end of this article, you will have a clearer understanding of which Cisco ISR router best fits your organization’s needs.
Processing Power and Bandwidth
Cisco ISR4321
Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4331
Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4431
Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4461
Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Scalability and Expansion
Cisco ISR4321
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4331
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4431
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4461
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Security Features
ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4321
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4331
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4431
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4461
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Management and Monitoring Tools
Cisco ISR4321
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4321: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4331
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4331: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4431
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4431: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Cisco ISR4461
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- Cisco ISR4461: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Best Use Cases
ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Which Cisco ISR Router is Right for You?
ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
- ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
ISR 4000: verify the exact PID, lifecycle, IOS XE release, licenses, interfaces, modules, published test conditions, enabled services, support, spares, and measured requirements for this comparison criterion.
Frequently Asked Questions
Q1: Which Cisco ISR 4000 model is fastest?
A: Cisco publishes different licensed aggregate-throughput tiers, but application and encrypted performance depend on PID, IOS XE, packet size, traffic mix, enabled services, interfaces, and test method. “Fastest” alone is not a selection rule.
Q2: Are ISR4321, ISR4331, ISR4431, and ISR4461 end of sale?
A: Cisco lists the ISR 4000 family as end of sale. Model-specific last-support dates differ, so check the exact PID and official lifecycle notice.
Q3: Can ISR 4000 modules be reused in Catalyst 8000 routers?
A: Do not assume compatibility. Cisco explicitly distinguishes ISR 4000 modules from newer C-NIM and C-SM modules. Verify every interface, service module, memory, storage, power, transceiver, license, and configuration.
Q4: What should replace an ISR 4000 router?
A: Cisco points to Catalyst 8200 and 8300 families, but replacement is not one-for-one. Match WAN circuits, interfaces, modules, throughput with services, scale, security, software, subscriptions, rack, power, and operations.
Q5: Should I keep or replace an ISR 4000 router?
A: Keep it only while lifecycle, software, vulnerabilities, capacity, interfaces, hardware health, support, spares, and business risk meet written criteria. Otherwise plan a tested migration and compare current router options.
