Cisco 2951 vs. 2921 vs. 2911 vs. Cisco 2901

By offering four platforms: the Cisco 2901, 2911, 2921, and 2951 routers, Cisco 2900 series router builds on the previous Cisco 2800 Series Integrated Services Routers(It was already end of life and end of sale.)

Designed for today’s medium-sized branches and with the purpose of evolving to cloud-based services, all the Cisco 2900 models offer embedded hardware encryption acceleration, voice-and video-capable digital signal processor (DSP) slots, optional firewall, intrusion prevention, call processing, voicemail, and application services.

Cisco 2900 router models have main common features, such as Firewall protection, VPN support, MPLS support, Syslog support, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED), Web Services Management Agent (WSMA), NetFlow, but in details, they are different. How to choose the most suitable one among the four Cisco 2900 platforms? Here, we do a general comparison of Cisco 2901, 2911, 2921 and 2951 router to help you pick out the very right Cisco 2900 model.

Cisco 2900 Series Integrated Services Routers-Model Comparison

Cisco 2900 MODEL Comparison: Cisco 2951 vs. 2921 router vs. Cisco 2911 vs. Cisco 2901

 

Cisco 2951

Cisco 2921

 

CISCO 2911

Cisco 2901

Form Factor

2 RU

2 RU

2 RU

1 RU

Integrated WAN Ports

3 Gigabit Ethernet
(1 SFP)

3 Gigabit Ethernet
(1 SFP)

3 Gigabit Ethernet

2 Gigabit Ethernet

Interface slots (enhanced high-speed WAN interface card [EHWIC])

4

4

4

4

Interface Slots, Network Interface Modules

N/A

N/A

N/A

N/A

Service-module slots

2

1

1

0

Integrated services module (ISM) slots

1

1

1

1

Packet-voice data-module (PVDM) slots

3

3

2

2

USB Ports (v2.0)

2

2

2

2

Default/maximum flash memory

256 MB/ 8 GB

256 MB/ 8 GB

256 MB/ 8 GB

256 MB/ 8 GB

Default/maximum synchronous dynamic RAM (SDRAM)

512 MB/ 4 GB*

512 MB/ 2.5 GB

512 MB/ 2.5 GB

512 MB/ 2.5 GB

Modular LAN switchports (with optional Power over Ethernet)

50**

50**

24**

16

Advanced Security

Enabled via security license for the Universal IOS image. IPS and content filtering need additional subscription licenses.

Stateful Firewall

Yes

Yes

Yes

Yes

Intrusion Prevention

Yes

Yes

Yes

Yes

Content Filtering

Yes

Yes

Yes

Yes

Voice and Video DSP support

PVDM3 and PVDM2

PVDM3 and PVDM2

PVDM3 and PVDM2

PVDM3 and PVDM2

Survivable Remote Site Telephony (SRST)

Up to 250

Up to 100

Up to 50

Up to 35

Cisco Unified Communications Manager Express

Up to 150

Up to 100

Up to 50

Up to 35

Cisco Unity Express (network module [NM], service module [SM], or ISM)

32 ports; 300 mailboxes

32 ports; 300 mailboxes

32 ports; 300 mailboxes

10 ports; 100 mailboxes

Session Initiation Protocol (SIP) sessions

600

400

200

100

Digital Voice Support

Up to 400

Up to 240

Up to 150

Up to 100

Maximum voice support for analog and Basic Rate Interface (BRI)

FXS 64, FXO 40, BRI 24

FXS 40, FXO 28, BRI 16

FXS 40, FXO 28, BRI 16

FXS 16, FXO 16, BRI 8

More than Cisco 2900 Model Comparison

About the Software Requirements of Cisco 2900 Series

The four Cisco 2900 Series platforms of Cisco 2951, 2921, 2911 and 2901 model run on the IOS Software IP Base.

The Modularity Features and Benefits of Cisco 2900 Series

In fact, most of the modules available on previous generations of Cisco routers, such as the Cisco 2800 Series, are supported on the Cisco 2900 Series. Let’s check the benefits of main Cisco ISR modules as follows.

The Modularity Features and Benefits of Cisco 2900 Series

More Related Cisco ISR G2 Comparison

Cisco 2901 vs. Cisco 1921 vs. Cisco 1941/1941W

Cisco 2901 Router Review

Cisco 1921 vs. Cisco 1941 vs. Cisco 1941W

Cisco 4451-X vs. Cisco 3945E vs. 3925E vs. Cisco 3945 vs. 3925 Router

 

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