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

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If you wanna buy a Cisco router to set up your network, maybe you are confused with the detailed functions of these models, such as Cisco 1921, Cisco 1941 and Cisco 2901. Which one would be better for your network setup? For example, if you need one that support over 10 routing protocol such as OSPF, BGP, EIGRP, PIM-SM, IGMPv3, static IPv4 routing, static IPv6 routing; an evolutionary platform with multicore CPUs, etc. the CISCO1941W-E/K9 may be not a bad choice.

Cisco 1921 vs. Cisco 1941 vs. Cisco 2901

So what are the main differences between the following routers: Cisco 2901, Cisco 1941 and Cisco 1921? Here we list the main differences and features of Cisco 1921, CISCO 1941 and Cisco 2901 in the following table:

Cisco 1921, Cisco 1941 and Cisco 2901 Comparison

CISCO 1921 Cisco 1941/Cisco 1941W Cisco 2901
Form Factor 1 RU 2 RU 1 RU

Integrated WAN Ports

2 Gigabit Ethernet

2 Gigabit Ethernet

2 Gigabit Ethernet

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




Interface Slots, Network Interface Modules

Service-module slots 0 0 0

Integrated services module (ISM) slots

0 1 1
Packet-voice data-module (PVDM) slots 0 0


USB Ports (v2.0)

1 2 2

Default/maximum flash memory

256 MB/256 MB

256 MB/ 8 GB

256 MB/ 8 GB

Default/maximum synchronous dynamic RAM (SDRAM)

512 MB/512 MB

512 MB/ 2.5 GB

512 MB/ 2.5 GB

Modular LAN switchports (with optional Power over Ethernet)

9 11 16

Stateful Firewall


Voice and Video DSP support


Survivable Remote Site Telephony (SRST)

Up to 35

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

10 ports; 100 mailboxes

Digital Voice Support

Up to 100

If you want to know the more detailed Cisco 1900 router models you can visit the page:

More Cisco 1900 Series Comparison:

Cisco 1921 vs. Cisco 1941 vs. Cisco 1941W

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