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Name: |
C2821-25UC/K9 |
Description: | 2821 w/ PVDM2-32,AIM-CUE,25 CME/CUE/Ph lic,SP Serv,128F/512D |
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GTIN: | 818250598303 ![]() |
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C2821-25UC/K9 Overview
C2821-25UC/K9 is an integrated services router engineered for enterprise environments where robust performance and secure connectivity are critical. Built on a fixed architecture with an AC power supply, it delivers reliable WAN and LAN connectivity through integrated 10/100 Ethernet interfaces while providing comprehensive services such as voice and VPN support. Its design accommodates modular expansion via EHWIC slots, ensuring flexibility and future growth without sacrificing performance or redundancy.
Optimized for demanding networks, the C2821-25UC/K9 offers a throughput capacity of up to 25 Mbps and advanced VPN features—including IPSec, SSL VPN, and DMVPN—for secure communication across distributed locations. Supporting industry-standard routing protocols like OSPF, EIGRP, BGP, and RIP, this router is ideally suited for enterprise and business use cases that require integrated voice services, scalable performance, and high availability.
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C2821-25UC/K9 Specifications
Product Type | Enterprise Router |
VPN Support | IPSec / SSL VPN / DMVPN / N/A |
Power Source | AC Power Supply |
Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing |
Broadband | N/A |
Architecture | Fixed |
WAN Configuration | WAN |
WAN Ports | 2 WAN |
LAN Ports | 4 LAN Ports |
Ethernet Technology | 10/100 |
Wi-Fi Standard | N/A |
Connectivity Type | Wired |
Network Protocols | IPv4 / IPv6 / MPLS |
Remote Management | Telnet / SSH / SNMP |
Compliance Standards | FCC / CE |
Wireless Support | No |
Speed/Capacity | 10/100 |
Firewall Features | Yes |
Features | VPN / VoIP / IPv6 Compatible / Firewall |
Use Case | Enterprise |
Management | Managed |
Form Factor | Rack-mount |
Integrated Services | Voice |
High Availability Support | Supported |
Safety | N/A |
EMC | N/A |
Telecom | N/A |
Throughput Capacity | 25 Mbps |
QoS Features | Supported |
Built-in Security Features | Firewall / Intrusion Prevention |
Expansion Slots | EHWIC |
Modular Slots Available | 2 Slots |
Stacking Capability | No |
5G Support | No |
Memory | 256 MB |
Flash Memory | 128 MB |
Interface Ports | RJ-45 |
Power | 85 Watt |
Device Type | Router |
Product Name | Cisco C2821-25UC/K9 Integrated Services Router |
Height | N/A |
Width | N/A |
Depth | N/A |
Weight | N/A |
Quality Certifications
To get the detailed certification, please go to the Compliance Center.







Product Comparison Table
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Product Type | Integrated Services Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
Connectivity Type | Wired | Wired | Wired | Wired | Wired |
Broadband | N/A | N/A | N/A | N/A | N/A |
Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply / Redundant AC | AC Power Supply |
Architecture | Fixed | Fixed | Modular | Fixed | Fixed |
WAN Configuration | Dual WAN | WAN | Dual WAN | Dual WAN | WAN |
WAN Ports | 2 WAN | 2 WAN | 2 WAN | 4 WAN Ports | 1 WAN |
LAN Ports | 4 LAN Ports | 4 LAN Ports | Modular LAN | 4 LAN Ports | 8 LAN Ports |
Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100/1000 | 10/100/1000 |
Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
Wireless Support | No | No | No | No | No |
Speed/Capacity | N/A | 10/100 | N/A | Gigabit | Gigabit |
Routing Protocols Supported | - | - | - | - | - |
VPN Support | IPSec | IPSec / SSL VPN / DMVPN / N/A | IPSec / DMVPN / N/A | IPSec / SSL VPN / DMVPN | IPSec / SSL VPN / DMVPN |
Firewall Features | Yes | Yes | Yes | Yes | Yes |
Features | VPN / Firewall / IPv6 Compatible | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN, IPv6 Compatible, Firewall, QoS | VPN / IPv6 Compatible / Firewall / POE |
Use Case | Small Business / Branch Office | Enterprise | Enterprise | Business / Enterprise | Business |
Management | Managed | Managed | Managed | Managed | Managed |
Form Factor | Desktop | Rack-mount | Rack-mount | Desktop | Desktop |
Integrated Services | Voice | Voice | Voice / Video / WAN Optimization | Voice, Video, WAN Optimization | Voice / Video |
High Availability Support | Not Supported | Supported | Supported | Supported | Supported |
Throughput Capacity | 0.1 Gbps | 25 Mbps | 0.075 Gbps | 250 Mbps | 0.15 Gbps |
QoS Features | Supported | Supported | Supported | Supported | Supported |
Built-in Security Features | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention | Firewall | Firewall, Intrusion Prevention, Malware Protection | Firewall / Intrusion Prevention / Malware Protection |
Expansion Slots | EHWIC | EHWIC | EHWIC | EHWIC | N/A |
Modular Slots Available | N/A | 2 Slots | 2 Slots | 1 Slot | N/A |
Stacking Capability | No | No | No | No | No |
5G Support | No | No | No | No | No |
Memory | 256 MB | 256 MB | 512 MB | 2 GB | 1 GB |
Flash Memory | 256 MB | 128 MB | 256 MB | 512 MB | 512 MB |
Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 / SFP | RJ-45 |
Device Type | Router | Router | Router | Router | Router |
Product Name | Cisco 881G-A-K9 Integrated Services Router | Cisco C2821-25UC/K9 Integrated Services Router | Cisco 2851 Integrated Services Router | Cisco 1111-4PWZ Integrated Services Router | Cisco C1111-8P Integrated Services Router |
Height | N/A | N/A | 4.4 inches | 1.75 inches | N/A |
Width | N/A | N/A | 17.3 inches | 17 inches | N/A |
Depth | N/A | N/A | 14.5 inches | 15 inches | N/A |
Weight | N/A | N/A | 23.1 lbs | 13 lbs | N/A |
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