Replacement for CISCO2821: Drop-In Alternatives We Stock
Looking for a replacement for the CISCO2821 (CISCO2821 - Cisco 2821 10/100/1000Base-T Ethernet Modular 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 CISCO2821
| SKU | CISCO2821 |
|---|---|
| Product | CISCO2821 - Cisco 2821 10/100/1000Base-T Ethernet Modular Router |
| Current price | $344.33 |
| Stock status | In Stock |
| Detail page | View CISCO2821 › |
Drop-in replacements for CISCO2821
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.
Cisco ISR4331/K9 ISR 3 x 10/100/1000 Ports Gigabit Ethernet Modular Router
SKU: ISR4331-K9
Price: $270.51
Cisco A9K-MPA-2X10GE 2-port 10-Gigabit Ethernet Modular Port Adapter - expansion module - 2 ports
SKU: A9K-MPA-2X10GE
Price: $283.55
C1000FE-48P-4G-L - Cisco Catalyst Ethernet Switch - 48 Ports - Manageable - 2 Layer Supported - Modular - 4 SFP Slots - 48.09 W Power Consumption - 370 W PoE Budget - Optical Fiber, Twisted Pair - PoE
SKU: C1000FE-48P-4G-L
Price: $1,052.62
RVS4000 - Cisco 230V 4-Port 10/100/1000Base-T Gigabit Ethernet Security Bundle Router
SKU: RVS4000
Price: $189.47
Cisco CISCO1941W-A/K9 230V 10/100/1000Base-T Gigabit Ethernet Integrated Router
SKU: CISCO1941W-A-K9
Price: $259.50
Cisco C1861-SRST-F/K9 1861 8-Port 8 x 10/100/ PoE Fast Ethernet Integrated Services Router
SKU: C1861-SRST-F-K9
Price: $326.14
Cisco ISR4321-SEC/K9 ISR 2-Port 4-Slot 10/100/1000Base-T Gigabit Ethernet Integrated Service Router
SKU: ISR4321-SEC-K9
Price: $404.22
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.