Cisco ISR4351/K9 4000 Series Integrated Services Router
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ISR4351/K9 Overview
ISR4351/K9 Platform and Throughput Tier
ISR4351/K9 is the ISR 4351 base hardware PID. Cisco specifies 200 Mbps default aggregate throughput and 400 Mbps with the FL-4350-PERF-K9 performance license. Buyers should distinguish licensed throughput from physical interface speed and verify the actual license state rather than assuming every chassis operates at the upgraded tier.
Integrated Ports and Module Capacity
The router provides three onboard Gigabit Ethernet interfaces, three Network Interface Module slots, two Enhanced Service Module slots and one Internal Services Card slot. Cisco's ordering table lists 4 GB default flash and 4 GB default DRAM. The 2RU chassis supports hardware expansion for WAN, voice and service functions, but those modules are separate inventory items.
Purchase Checks
- Verify the FL-4350-PERF-K9 license before quoting 400 Mbps throughput.
- Inventory NIM, SM-X, ISC and voice DSP modules by exact PID.
- Confirm AC, DC or PoE power configuration and redundancy requirements.
- Check IOS XE release, security licensing, rack hardware and lifecycle support.
ISR4351/K9 Specification
| Exact model / SKU | ISR4351/K9 |
| Product type | Cisco 4000 Series Integrated Services Router |
| Default aggregate throughput | 200 Mbps |
| Performance-license throughput | 400 Mbps with FL-4350-PERF-K9 |
| Onboard Gigabit Ethernet | 3 |
| NIM slots | 3 |
| SM-X slots | 2 |
| ISC slots | 1 |
| Default flash | 4 GB |
| Default DRAM | 4 GB |
| Dimensions | 3.5 x 17.25 x 18.5 in (H x W x D) |
| Form factor | 2RU |
| Source match | Exact ISR4351/K9 ordering configuration, throughput license tier and physical specifications in Cisco's official ISR 4000 data sheet |
| Official manufacturer reference | Cisco 4000 Series ISR official data sheet |
ISR4351/K9 Warranty
 | Low Price Guarantee |  | Quality Assurance |
 | Free CCIE Expert Technical Support |  | Commodity Refund Guarantee |
 | Diversified and Flexible Transportation Services |  | Standard Policy |
ISR4351/K9 FAQ
What is ISR4351/K9?
Cisco ISR4351/K9 4000 Series Integrated Services Router is a CISCO Router ISR 4000 product supplied by YYST Global for enterprise IT procurement and infrastructure projects.
What default aggregate throughput is listed for ISR4351/K9?
For ISR4351/K9, the manufacturer specification lists default aggregate throughput as 200 Mbps.
What performance-license throughput is listed for ISR4351/K9?
For ISR4351/K9, the manufacturer specification lists performance-license throughput as 400 Mbps with FL-4350-PERF-K9.
What interfaces and ports does ISR4351/K9 provide?
For ISR4351/K9, the manufacturer specification lists onboard gigabit ethernet as 3.
Is ISR4351/K9 available from YYST Global?
ISR4351/K9 is in stock at YYST Global. Contact the sales team to confirm the required quantity, exact configuration, delivery destination and current lead time before ordering.
Related products
Related ISR4351/K9
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ISO 9001 · ISO 14001 · ISO 45001
ISO 20000 · ISO 27001 · D&B