Replacement for C1121-4P: Drop-In Alternatives We Stock
Looking for a replacement for the C1121-4P (C1121-4P - Cisco Systems ISR 1100 4P RJ-45 4 Ports Gigabit Ethernet Rack-mountable Dual Ge SFP Router)? Pro Disk Network ships Cisco drop-in replacements and equivalent modern parts from US inventory. Every alternate below is in-stock today with same-day shipping for orders placed before 2pm ET. If your unit is still under warranty, contact our engineering team — we offer cross-shipping for B2B customers on Net 30 terms.
About the C1121-4P
| SKU | C1121-4P |
|---|---|
| Product | C1121-4P - Cisco Systems ISR 1100 4P RJ-45 4 Ports Gigabit Ethernet Rack-mountable Dual Ge SFP Router |
| Stock status | In Stock |
| Detail page | View C1121-4P › |
Drop-in replacements for C1121-4P
Each part below is currently in our US warehouse, ships same-day for orders before 2pm ET, and includes our 90-day warranty. SKUs link to the full product page with photos, datasheets and B2B quote form.
WS-C3560CG-8PC-S - Cisco Catalyst PoE RJ-45 8 x Ports 10/100/1000Base-TX + 2 x combo Gigabit SFP Gigabit SFP managed desktop Gigabit Ethernet Switch
SKU: WS-C3560CG-8PC-S
Price: $3,642.95
MS210-24P-HW - Cisco Meraki MS210-24P POE RJ-45 24 x Ports 10/100/1000Base-T + 4 x SFP Ports + 2 x Stack Ports Layer 2 Gigabit Ethernet Access Switch
SKU: MS210-24P-HW
Price: $3,168.42
WS-C3850-32XS-S - Cisco Catalyst 32XS-S RJ-45 32 x Ports 10GBase-X + 24 x 1 Gigabit / 10 Gigabit SFP+ 6 x 10 Gigabit SFP+ (uplink) Layer 3 Managed Desktop Rack Mountable 1U Switch
SKU: WS-C3850-32XS-S
Price: $16,268.25
SG300-28P - Cisco Small Business 300 Series RJ-45 PoE+ 28 x Ports 10/100/1000Base-T + 2 x combo Gigabit SFP Layer 3 Managed Desktop Rack Mountable 1U Gigabit Ethernet Switch
SKU: SG300-28P
Price: $869.47
WS-C2960CG-8TC-L - Cisco Catalyst RJ-45 8 x Ports 10/100/1000Base-T + 2 x Uplink Ports Compact Gigabit Ethernet Switch
SKU: WS-C2960CG-8TC-L
Price: $90.79
MS225-24-HW - Cisco Meraki MS225-24 RJ-45 24 x Ports 10/100/1000Base-T + 4 x SFP+ 2 x Stacking Ports Layer 2 Managed Gigabit Ethernet Stackable Access Switch
SKU: MS225-24-HW
Price: $246.95
MS225-24P-HW - Cisco Meraki MS225-24P PoE RJ-45 24 x Ports 10/100/1000Base-T + 4 x SFP+ 2 x Stacking Ports Layer 2 Managed Gigabit Ethernet Stackable Access Switch
SKU: MS225-24P-HW
Price: $377.68
MS225-48LP-HW - Cisco MerakiMS225-48LP PoE+ RJ-45 48 x Ports 10/100/1000Base-T + 4 x SFP+ 2 x Stacking Ports Layer 3 Managed Stackable Gigabit Ethernet Access Switch
SKU: MS225-48LP-HW
Price: $3,125.00
WS-C2960L-16TS-LL - Cisco Catalyst 2960 RJ-45 16 x Ports 10/100/1000Base-T + 2 x SFP Ports Layer 3 Managed Gigabit Ethernet Switch
SKU: WS-C2960L-16TS-LL
Price: $3,316.33
IE-4000-8S4G-E - Cisco Industrial Ethernet 4000 RJ-45 8 x Ports 1000Base-X + 4 x SFP Layer 3 Managed Gigabit Ethernet Switch
SKU: IE-4000-8S4G-E
Price: $803.79
How we pick replacements
Every recommendation above was selected using these criteria:
- Drop-in compatibility — same form factor (2.5"/3.5", PCIe slot, SFP port, etc.), so it fits the original chassis without modification
- Equivalent or better performance — matched on RPM/IOPS/speed/throughput, never downgraded
- Same-brand-preferred — we list the OEM-equivalent first when available, then trusted aftermarket
- Warranty coverage — 90-day Pro Disk warranty on every part, with 1-year option for B2B
- In stock today — never recommend a part that is on backorder
Need help confirming compatibility?
Our engineers validate every replacement against your specific server, switch, or chassis model before shipment. Email sales@prodisknetwork.com with your platform model (e.g., Dell PowerEdge R740, HP DL380 Gen10, Cisco Catalyst 9300) and we will confirm the exact part number that drops into your hardware.