Cisco • SKU ISR4431/K9
Cisco ISR4431/K9 — ISR 4431 Integrated Services Router (4000
Cisco ISR 4431 Integrated Services Router (4000 Series), 1RU branch/aggregation router with 4 onboard GE WAN/LAN ports (4x RJ45 + 4x SFP), 3 NIM slots, 8GB Flash, 4GB DRAM, shipping with IP Base (IPB) feature set; 500 Mbps–1 Gbps aggregate throughput (boostable via license).
- End-of-sale — refurbished only
- Stock image pending — request real-world photo
Download Cisco datasheet ↗ via Cisco 4000 Family Integrated Services Router Data Sheet (official); corroborated by router-switch.com and itprice.com datasheet mirrors.
What is the Cisco ISR4431/K9?
Cisco ISR 4431 Integrated Services Router (4000 Series), 1RU branch/aggregation router with 4 onboard GE WAN/LAN ports (4x RJ45 + 4x SFP), 3 NIM slots, 8GB Flash, 4GB DRAM, shipping with IP Base (IPB) feature set; 500 Mbps–1 Gbps aggregate throughput (boostable via license).
TFI supplies the ISR4431/K9 refurbished to South African businesses, each unit covered by warranty and optional SLA. As a B-BBEE Level 2 distributor we can quote stock, lead time and price — usually within the same business day.
Specifications
| ports | 4 onboard 10/100/1000 GE WAN/LAN ports (4x RJ45 + 4x SFP) |
|---|---|
| module slots | 3 Network Interface Module (NIM) slots |
| throughput | 500 Mbps to 1 Gbps aggregate system throughput (license-boostable) |
| flash | 8 GB default Flash storage |
| dram | 4 GB DRAM control plane + 2 GB DRAM data plane (default) |
| license | IP Base (IPB) feature set bundled; /K9 strong-crypto variant |
| form factor | 1 rack unit (1RU), rack-mountable; ~250W max (AC, no PoE) |
| eol status | End-of-Sale 7 Nov 2023; Last Day of Support / EoSL 30 Nov 2028; replaced by Catalyst 8300 series |
End-of-life status
The ISR4431/K9 is end-of-sale
Cisco has declared the ISR4431/K9 end-of-sale, so it is no longer manufactured new. TFI supplies it professionally refurbished and tested.
Why refurbished still makes sense: a refurbished ISR4431/K9 delivers the same proven performance at a fraction of the new-equipment cost, backed by a TFI warranty and SLA. It is the practical choice for spares, expansion of an existing deployment, or extending the life of a network you are not ready to replace. Talk to us about a successor model if you are planning a refresh.
Frequently asked questions
- What is the Cisco ISR4431/K9?
- Cisco ISR 4431 Integrated Services Router (4000 Series), 1RU branch/aggregation router with 4 onboard GE WAN/LAN ports (4x RJ45 + 4x SFP), 3 NIM slots, 8GB Flash, 4GB DRAM, shipping with IP Base (IPB) feature set; 500 Mbps–1 Gbps aggregate throughput (boostable via license).
- Is the ISR4431/K9 still supported?
- The Cisco ISR4431/K9 has reached end-of-sale, so it is supplied refurbished. TFI back every refurbished unit with a warranty and SLA options, which makes it a cost-effective choice where the platform still fits your network.
- How many ports does the ISR4431/K9 have?
- Port configuration: 4 onboard 10/100/1000 GE WAN/LAN ports (4x RJ45 + 4x SFP).
- Can TFI deliver the ISR4431/K9 in South Africa?
- Yes. TFI is a South African distributor (B-BBEE Level 2) and ships the Cisco ISR4431/K9 nationwide. Send us the SKU and we come back with stock, lead time and price — usually the same business day.
Also in the Cisco ISR4400 Series Routers
-
ACS-4350-BEZEL
Cisco ISR 4350 Series Front Bezel — cosmetic faceplate accessory/spare for Cisco ISR 4351, ISR 4351/K9 routers (1U rack-mount form factor)
-
ACS-4430-BEZEL
Cisco ISR 4430 Series Front Bezel — decorative/protective front panel accessory for ISR 4430 routers, 1U rack-mount form factor
-
ACS-4430-FanASSY
Cisco ACS-4430-FANASSY — field-replaceable, hot-swappable fan tray assembly (spare) for the Cisco ISR 4400-series 1RU chassis. Cisco product/manufacturing number 800-40759-01. Cools the router internals; a single-tray FRU containing all chassis fans.
-
ACS-4430-RM-19
Cisco 19-inch Rackmount Kit for ISR 4430/4431 routers — 2-post, 2-bracket steel mounting kit for standard 19-inch equipment racks
-
ACS-4430-RM-23
Cisco ISR 4430 23-Inch Rackmount Kit — physical rack-mount bracket accessory for installing the ISR 4430 router in a 23-inch wide telco-style rack
Verification sources (8)
- https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/data_sheet-c78-732542.html
- https://itprice.com/cisco/isr4431/k9.html
- https://www.router-switch.com/pdf2html/pdf/isr4431-k9-datasheet.pdf
- https://www.provantage.com/cisco-systems-isr4431-k9~4CSC634K.htm
- https://www.renewtech.com/cisco-isr4431-k9.html
- https://www.cisco.com/c/en/us/products/collateral/routers/4000-series-integrated-services-routers-isr/select-isr4k-series-platform-eol.html
- https://www.layer23-switch.com/eol-eosl-tool/isr4431-k9/
- https://networkdevicesinc.com/products/isr4431-k9
Need pricing on ISR4431/K9?
Send us the SKU. We come back with stock, lead time and price — typically within the same business day.