Work With Us
Home » Store » Cisco 2921 Integrated Services Router

Cisco 2921 Integrated Services Router

Sourcing mission-critical hardware shouldn't mean gambling on auction sites or automated shopping carts. You get direct access to dedicated specialists who answer the phone, confirm exact compatibility, and deliver project-ready pricing built around your deployment timeline.

The Cisco 2921 is one of four Cisco 2900 Series Integrated Services Routers, alongside the 2901, 2911 and 2951. It is two rack units tall, ships with a 19-inch rack-mount kit and takes an optional 23-inch kit. It has three onboard 10/100/1000 ports, and one of them can run as an SFP port in place of its RJ-45 port. The base model, CISCO2921/K9, comes with 256 MB of compact flash, 512 MB of DRAM and the IP Base license. Cisco also sells security, voice, SRE and WAAS bundles, such as CISCO2921-SEC/K9 and CISCO2921-V/K9.

The router has four EHWIC slots, which can form two double-wide slots, one service module slot, one internal service module slot and three PVDM3 slots. The EHWIC slots take HWIC, WIC, VIC and VWIC cards, and EHWIC-1GE-SFP-CU needs Cisco IOS Software Release 15.1(4)M and fits up to four per router. The service module slot takes the SM-SRE-700-K9, SM-SRE-710-K9, SM-SRE-900-K9 or SM-SRE-910-K9, the internal slot takes the ISM-SRE-300-K9, and the router holds two SRE modules at most. The PVDM3 slots take PVDM3-16 up to PVDM3-256. The 512 MB of DRAM is soldered on, and the remaining memory slot takes 512 MB, 1 GB or 2 GB. Two compact flash slots hold up to 4 GB each, and the back panel adds two USB 2.0 ports, a USB console port, a serial console port and an auxiliary port.

Power comes as AC, PoE or DC, and the 2921 shares the PWR-2921-51-AC, PWR-2921-51-POE and PWR-2921-51-DC part numbers with the 2951. Ports on a switch module need the PoE supply, and DC input is 24 to 60 Vdc. An external Cisco RPS 2300 adds redundancy through the RPS-ADPTR-2921-51 adapter, or doubles PoE capacity in PoE boost mode. One universal Cisco IOS image carries every feature set, with IP Base active by default and the Data, Unified Communications, Security and Security No Payload Encryption licenses switching on more. The 2921 handles 100 SRST and 100 CME sessions, with concurrent services on WAN links up to 75 Mbps. Compact flash part numbers are common across the Cisco ISR G2 routers, including the Cisco 1921, Cisco 1941 and Cisco 2911. The wider range is under networking, and routers also sit in the Cisco router category.

Request a quote or send us your parts list.

Looking for a specific Cisco 2921 Integrated Services Router part?

Send us the part number and quantity. Quotes reflect real-time availability and part condition. A product specialist reviews each request and replies, typically within minutes during business hours.

    Prefer to call? (231) 287-5244

    No obligation. No spam. We never sell or share your information. Privacy statement

    Cisco 2921 parts we supply

    Routers and bundles (12)

    • CISCO2921/K9: Cisco 2921, 3 onboard GE, 4 EHWIC slots, 3 DSP slots, 1 ISM slot, 256 MB CF, 512 MB DRAM, IP Base
    • CISCO2921-SEC/K9: Cisco 2921 security bundle with the SEC license
    • CISCO2921-V/K9: Cisco 2921 voice bundle, PVDM3-32, UC license
    • C2921-CME-SRST/K9: Cisco 2921 voice bundle, PVDM3-32, FL-CME-SRST-25, UC license
    • C2921-VSEC/K9: Cisco 2921 voice and security bundle, PVDM3-32, UC and SEC licenses
    • C2921-VSEC-CUBE/K9: Cisco 2921 VSEC CUBE bundle, PVDM3-32, FL-CUBEE-25, UC and SEC licenses
    • C2921-VSEC-SRE/K9: Cisco 2921 SRE bundle, SRE 700 or SRE 710, PVDM3-32, UC and SEC licenses
    • C2921-VSEC-PSRE/K9: Cisco 2921 SRE bundle, SRE 910, PVDM3-32, UC and SEC licenses
    • C2921-UCSE/K9: Cisco 2921 UCSE bundle, SRE 900, SRE-V license, 2.5 GB ISR DRAM, 768 MB compact flash
    • C2921-WAAS-SEC/K9: Cisco 2921 WAAS SEC bundle, SRE 700, WAAS Enterprise Medium license, SEC license
    • C2921-WAASX-SEC/K9: Cisco 2921 with the WAAS Express feature license, Security license, 2.5 GB DRAM
    • C2921-WAASX/K9: Cisco 2921 with the WAAS Express feature license, 2.5 GB DRAM

    Voice DSP modules and adapter (7)

    • PVDM3-16: 16-channel high-density packet voice DSP module
    • PVDM3-32: 32-channel high-density packet voice DSP module
    • PVDM3-64: 64-channel high-density packet voice DSP module
    • PVDM3-128: 128-channel high-density packet voice DSP module
    • PVDM3-192: 192-channel high-density packet voice DSP module
    • PVDM3-256: 256-channel high-density packet voice DSP module
    • PVDM2-ADPTR: Adapter for PVDM2 modules in a PVDM3 slot

    Service modules and adapter (6)

    • SM-SRE-700-K9: Services Ready Engine 700 service module
    • SM-SRE-710-K9: Services Ready Engine 710 service module
    • SM-SRE-900-K9: Services Ready Engine 900 service module
    • SM-SRE-910-K9: Services Ready Engine 910 service module
    • ISM-SRE-300-K9: Services Ready Engine 300 internal service module
    • SM-NM-ADPTR: Network module adapter for the service module slot

    Interface cards (1)

    Memory and compact flash (11)

    • MEM-2900-512U1GB: 512 MB to 1 GB DRAM upgrade, Cisco 2901 to 2921
    • MEM-2900-512U1.5GB: 512 MB to 1.5 GB DRAM upgrade, Cisco 2901 to 2921
    • MEM-2900-512U2.5GB: 512 MB to 2.5 GB DRAM upgrade, Cisco 2901 to 2921
    • MEM-2900-512MB: 512 MB DRAM, Cisco 2901, 2911 and 2921 (spare)
    • MEM-2900-1GB: 1 GB DRAM, Cisco 2901, 2911 and 2921 (spare)
    • MEM-2900-2GB: 2 GB DRAM, Cisco 2901, 2911 and 2921 (spare)
    • MEM-CF-256MB: 256 MB compact flash, Cisco 1900, 2900 and 3900 ISR (default)
    • MEM-CF-256U512MB: 256 MB to 512 MB compact flash upgrade
    • MEM-CF-256U1GB: 256 MB to 1 GB compact flash upgrade
    • MEM-CF-256U2GB: 256 MB to 2 GB compact flash upgrade
    • MEM-CF-256U4GB: 256 MB to 4 GB compact flash upgrade

    Power and redundancy (6)

    • PWR-2921-51-AC: Cisco 2921 and 2951 AC power supply
    • PWR-2921-51-POE: Cisco 2921 and 2951 AC power supply with Power over Ethernet
    • PWR-2921-51-DC: Cisco 2921 and 2951 DC power supply
    • PWR-RPS2300: Cisco Redundant Power System 2300
    • RPS-ADPTR-2921-51: Cisco 2921 and 2951 RPS adapter for use with an external RPS
    • RPS-COVER-2921-51: Cover for the empty RPS adapter slot, Cisco 2921 and 2951 (spare)

    Cooling, mounting and blanks (6)

    • 2921-51-FANASSY: Cisco 2921 and 2951 fan assembly and bezel (spare)
    • ACS-2900-RM-19: 19-inch rack-mount kit, Cisco 2911, 2921 and 2951
    • ACS-2900-RM-23: 23-inch rack-mount kit, Cisco 2911, 2921 and 2951 (spare)
    • FIPS-SHIELD-2921: FIPS opacity shield for the Cisco 2921
    • SM-S-BLANK: Removable faceplate for the service module slot (spare)
    • HWIC-BLANK: Blank faceplate for an HWIC or EHWIC slot (spare)

    Software licenses (5)

    • SL-29-IPB-K9: IP Base license, common to the Cisco 2901, 2911, 2921 and 2951
    • SL-29-DATA-K9: Data license for the Cisco 2901 to 2951
    • SL-29-UC-K9: Unified Communications license for the Cisco 2901 to 2951
    • SL-29-SEC-K9: Security license for the Cisco 2901 to 2951
    • SL-29-SECNPE-K9: Security No Payload Encryption license for the Cisco 2901 to 2951
    Request a Quote