Cisco C1-CISCO4431/K9 Cisco ONE ISR 4431 Branch Router
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C1-CISCO4431/K9 Overview
C1-CISCO4431/K9 Exact Cisco ONE Identity
C1-CISCO4431/K9 is Cisco's former Cisco ONE hardware PID for the ISR 4431. Cisco's affected-product table identifies four onboard GE ports, three NIM slots, 8 GB flash, 4 GB DRAM and IP Base. The C1 prefix describes the retired Cisco ONE order line; it must not be silently replaced with a current subscription claim.
4431 capacity and expansion case
The ISR 4431 platform has more onboard GE and NIM capacity than the C1-CISCO4331/K9 order line. Cisco's family data sheet lists 500 Mbps default aggregate throughput and 1 Gbps with the performance license for ISR 4431, with higher CEF-only boost behavior documented separately. Verify the installed license and measured service mix before using any licensed throughput figure in a design.
Module and software inventory
Record every NIM, interface, power supply, memory item, IOS XE image and active entitlement. Confirm that each module is supported by the target software release and that required encryption, routing, voice or SD-WAN functions are licensed. The base Cisco ONE PID alone does not establish which later software rights remain transferable.
Lifecycle boundary
Cisco ended sale of this exact Select Cisco ONE hardware order line on October 28, 2022 and lists October 31, 2027 as its last support date. Cisco named ISR4431/K9 as the replacement order line. The underlying ISR 4431 platform has a separate support record, so procurement must evaluate both the exact PID lifecycle and the installed chassis/service status.
Migration acceptance
For continued operation, retain configuration backups, serial and entitlement evidence, WAN media, module compatibility and performance measurements. A migration plan should map interfaces, routing, security, application hosting and failover to a currently supported Cisco edge platform rather than assuming a configuration can be copied unchanged.
Official sources: Cisco Select Cisco ONE hardware lifecycle and exact PID table, Cisco ISR 4000 family data sheet and Cisco ISR 4431 support record.
C1-CISCO4431/K9 Specification
| Exact model / SKU | C1-CISCO4431/K9 |
| Exact Cisco ONE PID | C1-CISCO4431/K9 |
| Router platform | Cisco ISR 4431 |
| Cisco ONE order description | 4 GE, 3 NIM, 8 GB flash, 4 GB DRAM, IP Base |
| Published platform throughput | 500 Mbps default; 1 Gbps with Performance license; verify installed entitlement and service load |
| Exact PID lifecycle | End of sale October 28, 2022; last support October 31, 2027 |
| Cisco-listed replacement PID | ISR4431/K9 |
| Transfer gate | Verify serial, modules, IOS XE, license ownership, service contract and configuration backup |
| Migration scope | Interfaces, routing, security, hosting, WAN media, throughput and failover |
| Source match | C1-CISCO4431/K9 exact Cisco ONE hardware description, replacement PID, lifecycle and ISR 4431 platform distinctions verified using Cisco official records |
| Official manufacturer reference | Cisco Select Cisco ONE Hardware end-of-life announcement |
C1-CISCO4431/K9 Warranty
 | Product Quotation |  | Condition and Packaging |
 | Technical Support Enquiry |  | Returns and Replacement |
 | Shipping Arrangements |  | Warranty Terms |
C1-CISCO4431/K9 FAQ
What is C1-CISCO4431/K9?
Cisco C1-CISCO4431/K9 Cisco ONE ISR 4431 Branch Router is a CISCO Router ISR 4000 product supplied by YYST Global for enterprise IT procurement and infrastructure projects.
What published platform throughput is listed for C1-CISCO4431/K9?
For C1-CISCO4431/K9, the manufacturer specification lists published platform throughput as 500 Mbps default; 1 Gbps with Performance license; verify installed entitlement and service load.
Is C1-CISCO4431/K9 available from YYST Global?
Contact YYST Global to confirm availability for C1-CISCO4431/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 C1-CISCO4431/K9?
The current reference price for C1-CISCO4431/K9 is US$ 9,800.00. Final pricing can change based on stock, quantity, configuration and delivery destination.
Related products
Related C1-CISCO4431/K9
C1-CISCO4451/K9 - Cisco One 4000 Family Integrated Services Router
C1-CISCO4451/K9 is the Cisco ONE ISR 4451 order with four Gigabit interfaces, three NIM slots and two service-module slots. Its exact C1 hardware support milestone is October 31, 2027.
Cisco C1-CISCO4331/K9 Cisco ONE ISR 4331 Branch Router
C1-CISCO4331/K9 is the retired Cisco ONE ISR 4331 order line with three onboard Gigabit Ethernet ports, two NIM slots, one service-module slot, 4 GB flash, 4 GB DRAM and IP Base.
ISR4461/K9 - Cisco 4000 Family Integrated Services Router
ISR4461/K9 is Cisco's base ISR 4461 router with two 10-Gigabit and four Gigabit onboard interfaces, three NIM slots and three service-module slots. Its 1.5 Gbps default aggregate forwarding tier is distinct from the separately licensed 3 Gbps tier. Cisco ended sale January 20, 2025; final support is January 31, 2030 under applicable entitlement terms.
ISR4431/K9 - Cisco 4000 Family Integrated Services Router
ISR4431/K9 is the Cisco ISR 4431 base router order with four onboard Gigabit Ethernet interfaces, three NIM slots and one ISC slot. Cisco ended sale on November 7, 2023; general software maintenance ended August 31, 2025. Support eligibility and installed performance licenses require verification before procurement. The manufacturer family image is representative, not a photograph of a supplied unit.
ISR4431-DNA - Cisco 4000 Family Integrated Services Router
ISR4431-DNA is the Cisco ISR 4431 router order with a DNA subscription, four Gigabit interfaces and three NIM slots. Verify the quoted software tier and term; hardware support ends November 30, 2028.
ISR4221/K9 USED Cisco ISR 4221 Router
ISR4221/K9 is the base Cisco ISR 4221 order described with two Gigabit Ethernet interfaces, two NIM slots, 8 GB flash, 4 GB DRAM and IP Base. See the verified interface, replacement and lifecycle boundaries before requesting a quote.
Cisco ISR4351-SEC/K9 3GE,3NIM,2SM,4G FLASH,4G DRAM,Security Bundle
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.
ISR4451-X-SEC/K9 Cisco ISR 4451-X Security Bundle Router
ISR4451-X-SEC/K9 is a Cisco security-bundle router with four Gigabit Ethernet interfaces and 1 Gbps default aggregate throughput. The 2 Gbps performance license is separate; review final IOS XE train and support limits before retaining this legacy platform.