ISR4331-AX/K9 - Cisco 4000 Family Integrated Services Router
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ISR4331-AX/K9 Overview
ISR4331-AX/K9 Application Experience Scope
ISR4331-AX/K9 is the Cisco ISR 4331 Application Experience Bundle with APP and SEC licenses. Cisco's AX definition combines IP Base, Security, advanced networking and application-experience functions; it is not merely another name for ISR4331-SEC/K9.
What AX adds to the security baseline
Cisco lists L2TPv3, BFD, MPLS, VRF and VXLAN, plus PfRv3, WAAS with AppNav, NBAR2, AVC and IP SLA. Hybrid-cloud functions include LISP, OTV, VPLS and EoMPLS, with bandwidth qualifications documented for some features. Validate the exact IOS XE release and feature license rather than assuming every historical AX capability is active.
WAAS and application deployment check
Record whether the project actually uses WAAS/AppNav, application visibility or path control. Check storage, memory, service-module needs and remote-side design before reuse; an APP license in inventory does not guarantee a complete application-acceleration deployment.
ISR4331 physical foundation
The platform provides three onboard GE interfaces, two NIM slots, one ISC slot, one SM slot, 4 GB Flash and 4 GB DRAM by default. The AX PID does not itself include every possible NIM, service module, optic, memory upgrade or voice resource.
Throughput and licensing gate
The published ISR4331 base level is 100 Mbps, with separate performance and boost licensing options. Confirm current entitlement, encrypted/application traffic and target headroom before accepting the router.
End-of-sale migration
Cisco ended sale on November 7, 2023 and names C8200-1N-4T as replacement. Security support and last hardware support are listed through November 30, 2028, while routine software-maintenance releases ended August 31, 2025.
Compare the narrower bundle
ISR4331-SEC/K9 is the SEC-only alternative when advanced application and data features are not required.
Evidence: Cisco exact AX PID and lifecycle table; Cisco AX feature and ISR4331 hardware tables.
ISR4331-AX/K9 Specification
| Exact model / SKU | ISR4331-AX/K9 |
| Exact order identity | Cisco ISR 4331 Application Experience Bundle with APP and SEC licenses |
| Platform interfaces | 3 onboard GE; 2 NIM; 1 ISC; 1 service-module slot |
| Default memory | 4 GB Flash and 4 GB DRAM |
| Bundle feature boundary | IP Base, Security, advanced networking, WAAS/AppNav and application-experience features |
| Performance licensing | 100 Mbps base; separate performance-on-demand path to 300 Mbps; boost entitlement is not implied |
| Lifecycle | End of sale November 7, 2023; software maintenance August 31, 2025; last support November 30, 2028 |
| Cisco migration product | Catalyst C8200-1N-4T |
| Receiving gate | Match PID/serial, IOS XE, license inventory, memory, installed modules, throughput entitlement and migration plan |
| Source match | ISR4331-AX/K9: exact Cisco bundle identity, ISR4331 hardware, feature boundary, performance licensing and lifecycle verified |
| Official manufacturer reference | Cisco ISR 4000 official data sheet |
ISR4331-AX/K9 Warranty
 | Product Quotation |  | Condition and Packaging |
 | Technical Support Enquiry |  | Returns and Replacement |
 | Shipping Arrangements |  | Warranty Terms |
ISR4331-AX/K9 FAQ
What is ISR4331-AX/K9?
ISR4331-AX/K9 - Cisco 4000 Family Integrated Services Router is a CISCO Router ISR 4000 product supplied by YYST Global for enterprise IT procurement and infrastructure projects.
What interfaces and ports does ISR4331-AX/K9 provide?
For ISR4331-AX/K9, the manufacturer specification lists platform interfaces as 3 onboard GE; 2 NIM; 1 ISC; 1 service-module slot.
What memory or storage is listed for ISR4331-AX/K9?
For ISR4331-AX/K9, the manufacturer specification lists default memory as 4 GB Flash and 4 GB DRAM.
Is ISR4331-AX/K9 available from YYST Global?
Contact YYST Global to confirm availability for ISR4331-AX/K9, the required quantity, exact configuration, delivery destination and current lead time before ordering. A product listing does not confirm current inventory.
What is the price of ISR4331-AX/K9?
The current reference price for ISR4331-AX/K9 is US$ 1,571.00. Final pricing can change based on stock, quantity, configuration and delivery destination.
Related products
Related ISR4331-AX/K9
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ISR4331-AXV/K9 is the Cisco ISR 4331 Application Experience and Voice bundle with APP, SEC and UC licenses plus a PVDM4-32 voice DSP module. Cisco ended sale in November 2023.
ISR4331/K9 Cisco ISR 4331 Base Hardware Order Router
ISR4331/K9 is the Cisco ISR 4331 Base Hardware Order with three onboard Gigabit Ethernet interfaces, two NIM slots, one ISC slot and one service-module slot. Verify exact modules, licenses and lifecycle eligibility before purchase.
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ISR4331-VSEC/K9 - Cisco 4000 Family Integrated Services Router
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ISR4351-SEC/K9 is the Cisco ISR 4351 security bundle identified in the official ordering row as including the SEC license. See the verified interface, replacement and lifecycle boundaries before requesting a quote.
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ISR4321-AX/K9 Cisco ISR 4321 Application Experience Bundle Router
ISR4321-AX/K9 is the Cisco ISR 4321 Application Experience Bundle order. Confirm the exact bundle entitlements, installed modules and lifecycle support before purchase.