ISR4451-X-VSEC/K9 Cisco ISR 4451-X Voice and Security Bundle Router

ISR 4451-X Voice and Security Bundle

ISR4451-X-VSEC/K9 is an exact Cisco order built on the ISR 4451-X with four onboard Gigabit Ethernet interfaces, three NIM slots, one ISC slot and two service-module slots. Bundle boundary: VSEC combines unified-communications and security ordering scope; application-experience licensing is not implied.

Platform performance boundary

1 Gbps default aggregate throughput, upgradeable to 2 Gbps with the documented performance license. This published aggregate value is a platform licensing boundary, not a guarantee for every mix of encryption, voice, application inspection or modular services.

Exact receiving evidence

Verify UC and SEC license state, PVDM inventory, voice interfaces, crypto eligibility, NIM/service modules and performance entitlement. Keep telephony capacity and encrypted WAN capacity as separate sizing records.

Workload-specific migration record

Design a two-domain cutover: first reproduce VPN, firewall and routing behavior, then validate trunks, dial plan and media services. Define an explicit backout trigger for tunnel instability, call-quality loss or DSP exhaustion.

Lifecycle decision

Cisco ended sale for this ISR 4000 generation and publishes 30 November 2028 as the last date of support for the affected platform family. Treat the recommended Catalyst 8300 family as a redesign starting point: interface modules, service-module functions, licenses, throughput, power and configuration are not automatically portable.

Acceptance checklist

Record the exact PID and serial, chassis inventory, memory, flash, power supplies, installed NIM/ISC/service modules, software release, performance license and every active entitlement. Preserve the final test evidence and configuration backup with the asset record.

Official sources: Cisco ISR 4000 Series data sheet and Cisco ISR 4000 lifecycle and migration notice.