In the last article we shared the main guide to order Cisco 3900 routers. The main tips you got when you need to buy a Cisco 3900 router. In this article we will continue to talk about the tips for ordering Cisco 2900 Series routers.
Like the Cisco 3900 series, Cisco 2900 Series also offers four platforms: the Cisco 2901, 2911, 2921, and Cisco 2951 routers.
The Cisco 2900 Series is designed to meet the application demands of today’s branch offices with design flexibility for future applications. The modular architecture is designed to support increasing bandwidth requirements, time-division multiplexing (TDM) interconnections, and fully integrated power distribution to modules supporting 802.3af Power over Ethernet (PoE) and Cisco Enhanced PoE (ePoE).
So what should you know about ordering Cisco 2900 Series Routers? Let’s take a look.
Cisco 2900 Series Integrated Services Routers
| Ordering SKU | Description | Technical Service SKU (SMARTnet 8x5XNBD) |
| CISCO2951/K9 | Cisco 2951 w/3 GE,4 EHWIC,3 DSP,2 SM,256MB CF,512MB DRAM,IPB | CON-SNT-2951 |
| CISCO2921/K9 | Cisco 2921 w/3 GE,4 EHWIC,3 DSP,1 SM,256MB CF,512MB DRAM,IPB | CON-SNT-2921 |
| CISCO2911/K9 | Cisco 2911 w/3 GE,4 EHWIC,2 DSP,1 SM,256MB CF,512MB DRAM,IPB | CON-SNT-2911 |
| CISCO2901/K9 | Cisco 2901 w/2 GE,4 EHWIC,2 DSP,256MB CF,512MB DRAM,IPB | CON-SNT-2901 |
You can order Cisco 2911, 2921, and 2951 with a power supply that is AC, PoE, or DC. During product configuration you must select the type of power supply and the power-supply cable you need for use in a particular country. These platforms also offer power redundancy with the use of an external RPS device (Cisco RPS 2300). A RPS adapter is needed in order to connect a Cisco 2911, 2921, or 2951 to the external RPS device. You can order the Cisco 2901 with an AC or PoE power supply. The Cisco 2901 does not offer a DC version of power supply and it does not support an external RPS.
You can order the power supply and RPS adapter part numbers in the following table with the router or as spares. In order to power ports on a switch module plugged into a router, it is important to order the router with PoE power supply.
Note that the Cisco 2921 and Cisco 2951 have the same part numbers.
Cisco 2900 Series Router Power Supply and RPS Adapter Options (Factory Options and Spares)
| Ordering SKU | Description |
| PWR-2921-51-AC | Cisco 2921/2951 AC Power Supply (Both system & spare) |
| PWR-2911-AC | Cisco 2911 AC Power Supply (Both system & spare) |
| PWR-2901-AC | Cisco 2901 AC Power Supply (Both system & spare) |
| PWR-2921-51-POE | Cisco 2921/2951 AC Power Supply with Power Over Ethernet (Both system & spare) |
| PWR-2911-POE | Cisco 2911 AC Power Supply with Power Over Ethernet (Both system & spare) |
| PWR-2901-POE | Cisco 2901 AC Power Supply with Power Over Ethernet (Both system & spare) |
| PWR-2921-51-DC** | Cisco 2921/2951 DC Power Supply (Both system & spare) |
| PWR-2911-DC* | Cisco 2911 DC Power Supply (Both system & spare) |
| RPS-ADPTR-2921-51 | Cisco 2921/2951 RPS Adapter for use with External RPS (Both system & spare) |
| RPS-ADPTR-2911 | Cisco 2911 RPS Adapter for use with External RPS (Both system & spare) |
- * The DC versions of power supply for the Cisco 2911 will be available in 1H’CY10
- ** The DC versions of power supply for the Cisco 2951 and 2921 will be available in CY10
All the Cisco 2900 Series base platforms ship with a default memory of 512-MB DRAM and 256-MB Compact Flash.
The default Cisco 2951 has a unique memory configuration, whereby a 512-MB DIMM is installed in one of the two memory slots on the router. Memory upgrades on the Cisco 2951 can involve an increase in the density of that single DIMM or a combination of DIMMs with both slots populated. The Cisco 2951 allows the use of asymmetric densities of DRAM in both slots.
On the Cisco 2921, 2911, and 2901, the default DRAM of 512 MB is soldered onto the motherboard. Hence, memory upgrades will populate the remaining memory slot in densities of 512 MB, 1 GB, and 2 GB. DRAM part numbers are shared across the Cisco 2921, 2911, and 2901, and you cannot use them on a Cisco 2951. Likewise, you cannot use the Cisco 2951 DRAM memory on other Cisco 2900 Series platforms.
DRAM Information about the Cisco 2900 Series Routers (Factory Upgrades and Spares)
| Ordering SKU | Description |
| MEM-3900-1GU4GB | 1GB to 4GB DRAM Upgrade (2GB+2GB) for Cisco 3925/3945 ISR |
| MEM-2951-512MB-DEF | 512MB DRAM (1 512MB DIMM) for Cisco 2951 ISR (Default) |
| MEM-2951-512U2GB | 512MB to 2GB DRAM Upgrade (1 2GB DIMM) for Cisco 2951 ISR |
| MEM-2951-512U1.5GB | 512MB to 1.5GB DRAM Upgrade (1GB+512MB) for Cisco 2951 ISR |
| MEM-2951-512U1GB | 512MB to 1GB DRAM Upgrade (1 1GB DIMM) for Cisco 2951 ISR |
| MEM-2951-2GB= | 2GB DRAM for Cisco 2951 ISR (only as spare) |
| MEM-2951-1GB= | 1GB DRAM for Cisco 2951 ISR (only as spare) |
| MEM-2951-512MB= | 512MB DRAM for Cisco 2951 ISR (only as spare) |
| MEM-2900-512MB-DEF | 512MB DRAM for Cisco 2901-2921 ISR (Default) |
| MEM-2900-512U2.5GB | 512MB to 2.5GB DRAM Upgrade (2GB+512MB) for Cisco 2901-2921 |
| MEM-2900-512U1.5GB | 512MB to 1.5GB DRAM Upgrade (1GB+512MB) for Cisco 2901-2921 |
| MEM-2900-512U1GB | 512MB to 1GB DRAM Upgrade (512MB+512MB) for Cisco 2901-2921 |
| MEM-2900-2GB= | 2GB DRAM for Cisco 2901, 2911, 2921 ISR (only as spare) |
| MEM-2900-1GB= | 1 GB DRAM for Cisco 2901, 2911, 2921 ISR (only as spare) |
| MEM-2900-512MB= | 512MB DRAM for Cisco 2901, 2911, 2921 ISR (only as spare) |
The Compact Flash part numbers are shared across all the platforms in the Cisco ISR G2 portfolio as follows. Compact Flash slot 0 is populated with a 256-MB Compact Flash by default from the factory. You can optionally configure and order an additional Compact Flash slot 1 with another Compact Flash of desired density.
Cisco 2900 Series Routers Compact Flash (Factory Upgrades and Spares)
| Ordering SKU | Description |
| MEM-CF-256U4GB | 256MB to 4GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256U2GB | 256MB to 2GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256U1GB | 256MB to 1GB Compact Flash Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256U512MB | 256MB to 512MB CF Upgrade for Cisco 1900, 2900, 3900 ISR |
| MEM-CF-256MB | 256MB Compact Flash for Cisco 1900, 2900, 3900 ISR (Default) |
| MEM-CF-4GB= | 4GB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-2GB= | 2GB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-1GB= | 1GB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-512MB= | 512MB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
| MEM-CF-256MB= | 256MB Compact Flash (Spare) for Cisco 1900, 2900, 3900 ISR (only as spare) |
You can order the fan assemblies on all the Cisco 2900 Series as spares if needed. An air filter is offered on the Cisco 2911 for dusty environments or NEBS deployments. You can order the filters along with the system or as spares for periodic maintenance and replacement. You can order the cover for the RPS slot on the Cisco 2951, 2921, and 2911 as spares. The same fan assembly is shared between the Cisco 2951 and 2921. Similarly, a fan blower assembly is shared between the Cisco 2901 and 1941 routers. The following table 10 lists the fan-related products for the Cisco 2900 Series routers.
Cisco 2900 Series Routers Fan-Related Products
| Ordering SKU | Description |
| 2921-51-FANASSY= | Cisco 2921/2951 Fan Assembly and Bezel (only as spare) |
| 2911-FANASSY= | Cisco 2911 Fan Assembly (no Bezel included) (only as spare) |
| 2911-FANFLTR-NEBS | Cisco 2911 Fan Filter for NEBS environment (Both system & spare) |
| 2911-AIRCVTR-NEBS= | Cisco 2911 Front-to-Back Air Flow Converter for NEBS use (only as spare) |
| 1941-2901-FANBLWR= | Cisco 1941/2901 Fan Blower Assembly (only as spare) |
| RPS-COVER-2921-51= | Cover for empty RPS Adapter slot on Cisco 2921/2951 (only as spare) |
| RPS-COVER-2911= | Cover for empty RPS Adapter slot on Cisco 2911 (only as spare) |
More Cisco 2900 Series Topics
Ordering Guide for Cisco 3900 ISR G2
Cisco 2951 vs. 2921 vs. 2911 vs. Cisco 2901
How to Recover Password on Cisco IOS Router?
A Simple Reason for Selecting Cisco ISR G2 Series for Your Network
