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Steven Parker
5
Powerful router for larger branch deployments. Handles higher workloads without performance drops.
CISCO2851
Cisco 2851 router 2851 w/ AC PWR, 2GE, 4HWIC, 3PVDM, 1NME-XD...
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CISCO2851
- Description:
- Cisco 2851 router 2851 w/ AC PWR, 2GE, 4HWIC, 3PVDM, 1NME-XD, 2AIM, IP BASE, 128F/512D
- Rating:
Added to cart 28 times recently
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- Brand:
- Cisco
- GTIN:
- 662895827119
- Condition:
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CISCO2851 Overview
CISCO2851 is a modular, integrated services router engineered for enterprise branch environments. It features a robust architecture with configurable EHWIC expansion slots, multiple WAN and LAN interface options, and integrated services that deliver voice, video, and data capabilities while operating on an AC Power Supply with internal redundancy options to safeguard network uptime.
CISCO2851 also offers advanced VPN functionality with IPSec and DMVPN support to secure remote connectivity, alongside reliable throughput capacity and QoS features that ensure consistent performance. Its modular design paired with built‐in firewall protection and scalability makes it ideally suited for enterprise use cases demanding high availability, superior security, and versatile connectivity solutions.
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CISCO2851 Specifications
- Power Source
- AC Power Supply
- Form Factor
- Rack-mount
- Flash Memory
- 256 MB
- Memory
- 512 MB
- Width
- 17.3 inches
- Weight
- 23.1 lbs
- Ethernet Technology
- 10/100
- Depth
- 14.5 inches
- Product Type
- Enterprise Router
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Remote Management
- Telnet, SSH, SNMP
- Wireless Support
- No
- Firewall Features
- Yes
- Management
- Managed
- Safety
- N/A
- EMC
- N/A
- Telecom
- N/A
- QoS Features
- Supported
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Interface Ports
- RJ-45
- Device Type
- Router
- Network Protocols
- IPv4, IPv6
- High Availability Support
- Supported
- Expansion Slots
- EHWIC
- Power
- 65 Watt
- Broadband
- N/A
- Speed/Capacity
- N/A
- Use Case
- Enterprise
- Integrated Services
- Voice / Video / WAN Optimization
- Compliance Standards
- FCC / CE
- VPN Support
- IPSec / DMVPN / N/A
- Throughput Capacity
- 0.075 Gbps
- LAN Ports
- Modular LAN
- Architecture
- Modular
- Built-in Security Features
- Firewall
- Features
- VPN / VoIP / IPv6 Compatible / Firewall / MPLS
- Routing Protocols
- OSPF / BGP / EIGRP / MPLS / RIP / Static Routing
- Height
- 4.4 inches
- Product Name
- Cisco 2851 Integrated Services Router
CISCO2851 Use Case
Secure Multi-Site VPN Connectivity for Distributed Retail Chain
A retail organization with 50+ storefronts deploys the Cisco 2851 router (AC PWR, 2 GE, 4 HWIC, 3 PVDM, 1 NME-XD, 2 AIM, IP BASE, 128F/512D) at each location to terminate IPsec VPN tunnels back to headquarters. Leveraging the four HWIC slots and two AIM modules, the retailer integrates firewall, intrusion prevention and WAN optimization services in a single platform. The 3 PVDM modules handle voice traffic for PoS terminals, while the 2 x GE ports provide redundant uplinks. Outcome: End-to-end encryption with sub-2 ms latency, centralized policy enforcement, 30% faster transaction processing and a 40% reduction in security appliance footprint.
High-Definition VoIP and Video Conferencing for Corporate Headquarters
A multinational company consolidates voice, video and data on the Cisco 2851 router (AC PWR, 2 GE, 4 HWIC, 3 PVDM, 1 NME-XD, 2 AIM, IP BASE, 128F/512D) at its main office. Three PVDM modules deliver up to 96 concurrent HD VoIP calls and integrate directly with the company’s Cisco Unified Communications Manager. The NME-XD flash module stores video messages and custom IVR scripts, while the HWIC slots host analog and digital voice gateways. Outcome: 50% reduction in call setup times, crystal-clear video meetings, unified management for voice and data and a 25% decrease in telephony CAPEX.
Scalable WAN Services for Growth-Oriented SMB with Integrated Security
A rapidly growing SMB uses the Cisco 2851 router (AC PWR, 2 GE, 4 HWIC, 3 PVDM, 1 NME-XD, 2 AIM, IP BASE, 128F/512D) as its primary WAN edge device. The two Gigabit Ethernet ports connect to dual ISP links for active/standby failover. Four HWIC slots support DSL, T1/E1 or 3G/4G backup modules, while the two AIM modules enable unified threat management and content filtering. The onboard NME-XD flash holds application signatures for deep packet inspection. Outcome: Seamless failover with under 5 s downtime, 99.9% network availability, integrated security and a platform that scales to 200% more throughput as the company expands.
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table
 CISCO2851 |  C2821-VSEC-SRST/K9 |  C2811-15UC/K9 |  CISCO2821-SRST/K9 |  CISCO2821 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Modular | Fixed with Modular Expansion | Modular | Fixed | Modular |
| Broadband | N/A | N/A | N/A | N/A | N/A |
| Built-in Security Features | Firewall | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention / Malware Protection | Firewall / Intrusion Prevention | Firewall |
| Compliance Standards | FCC / CE | RoHS, FCC, CE | FCC / CE | FCC, CE, RoHS | IEEE 802.3 / IEEE 802.3u |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | 14.5 inches | N/A | 17.48 in | 15.5 inches | 11.3 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | N/A | N/A | FCC | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC | EHWIC | EHWIC | EHWIC | EHWIC |
| Features | VPN / VoIP / IPv6 Compatible / Firewall / MPLS | VPN / VoIP / IPv6 Compatible / Firewall | VPN / VoIP / IPv6 Compatible / Firewall / POE / MPLS | VPN / Voice / NAT / ACL / QoS | VPN / IPv6 Compatible / Firewall / Voice |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Desktop | Rack-mount |
| Height | 4.4 inches | N/A | 1.73 in | 1.8 inches | 1.8 inches |
| High Availability Support | Supported | Supported | Not Supported | Supported | Not Supported |
| Integrated Services | Voice / Video / WAN Optimization | Voice | Voice / Video / WAN Optimization | Voice / Security / Data | Voice |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | Modular LAN | 4 LAN Ports | 4 LAN Ports | 2 LAN Ports | N/A |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 512 MB | 256 MB | 256 MB | 512 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4, IPv6 | IPv4, IPv6, MPLS, PPP | IPv4/IPv6 | IP, IGRP, OSPF, EIGRP, RIP, BGP | IPv4 / IPv6 |
| Power | 65 Watt | 85 Watt | 250 Watts | 72W | 60W |
| Power Source | AC Power Supply | AC Power Supply / Redundant | AC Power Supply | AC Power Supply | AC Power Supply |
| Product Name | Cisco 2851 Integrated Services Router | Cisco 2821 Integrated Services Router VSEC SRST | Cisco 2811 Integrated Services Router - 15 UC | CISCO2821-SRST/K9 | Cisco 2821 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | Telnet, SSH, SNMP | CLI, SNMP, Telnet, SSH | Telnet/SSH/SNMP | Telnet, SSH, SNMP, HTTP, HTTPS | Telnet / SSH / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / MPLS / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / BGP / Static Routing | OSPF / EIGRP / BGP / RIP / Static Routing |
| Safety | N/A | N/A | UL/cUL | N/A | N/A |
| Speed/Capacity | N/A | Gigabit | Gigabit | N/A | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | N/A | N/A | N/A |
| Throughput Capacity | 0.075 Gbps | 0.075 Gbps | 15 Mbps | 0.025 Gbps | N/A |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise / Small Business | Enterprise |
| VPN Support | IPSec / DMVPN / N/A | IPSec / SSL VPN / DMVPN | IPSec | IPSec | IPSec |
| WAN Configuration | Dual WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | 23.1 lbs | N/A | 15.93 lbs | 10 lbs | 10.3 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.3 inches | N/A | 19.69 in | 17.7 inches | 17.3 inches |
| Wireless Support | No | No | No | No | No |
Reviews & Ratings
B
Brian Mitchell
4
Excellent stability and processing capacity. A reliable core device for enterprise branches.
T
Thomas Reynolds
5
Consistent uptime and strong routing performance. Meets demanding business requirements.
K
Kevin Marshall
3
Robust hardware with predictable results. Suitable for complex network environments.
D
Daniel Hughes
4
Cisco reliability you can trust. No issues in production use so far.
Questions & Answers
What is the Cisco 2851 Router (SKU: CISCO2851)?
The Cisco 2851 is a high-performance, modular branch router featuring AC power, two Gigabit Ethernet ports, four HWIC slots, three PVDM slots, one NME-XD slot, dual AIM slots and an IP BASE license for secure WAN connectivity.
Which network interfaces does the Cisco 2851 provide?
The Cisco 2851 offers two Gigabit Ethernet RJ-45 ports, four High-Speed WAN Interface Card (HWIC) slots, one Network Module Enhanced (NME-XD) slot and two Advanced Integration Module (AIM) bays for voice or security modules.
What expansion modules are supported by the Cisco 2851?
Supported expansions include four HWIC modules (for additional Ethernet, serial or DSL ports), one NME-XD module (for gigabit WAN, fiber or specialized I/O) and two AIM slots for security or voice enhancement.
How much memory and storage does the Cisco 2851 include?
The Cisco 2851 ships with 128 MB of Flash memory and 512 MB of DRAM, expandable up to 256 MB Flash and 2 GB DRAM for advanced applications and larger configurations.