C2821-4SHDSL/K9

The Cisco C2821-4SHDSL/K9 is an enterprise-class router designed for service providers and business networks that rely on high-performance DSL aggregation. With up to 179 Mbps routing and switching capacity, it delivers stable throughput for multi-site VPNs and managed WAN services. Its integrated 4-pair G.SHDSL.bis interfaces support up to 22.784 Mbps over copper, ideal for regions where fiber is limited. Featuring 512 MB DRAM, 128 MB flash, and integrated security services, this rack-mountable platform suits Asian, European, African, and North American deployments.

Product Features Comparison

Model	C2821-4SHDSL/K9, Cisco 2821 Router, 4-pair G.SHDSL/128F Flash/512D RAM	C3945-VSEC-SRE/K9, Cisco 3945 Integrated Services Router, SRE 700/PVDM3-64/UC, SEC Lic	ASR1001-2.5G-SECK9, Cisco ASR1000 Router, 2.5G bandwidth/IPsec/Firewall	CISCO1921-SEC/K9, Cisco 1921 Router, Security Bundle/SEC license/PAK
Brand	Cisco	Cisco	Cisco	Cisco
Routing Throughput	Up to 179 Mbps	n/a	Max Performance: 2.5 Gbps	n/a
Interface Configuration	4 G.SHDSL interfaces; 4-pair G.SHDSL HWIC slot	Router Interfaces: WAN: 3 x 10Base-T/100Base-TX/1000Base-T - RJ-45; Management: 1 x console - RJ-45; Management: 1 x console - mini-USB Type B; Serial: 1 x auxiliary - RJ-45; USB: 3 x 4-pin USB Type A; 1 x 10Base-T/100Base-TX/1000Base-T - RJ-45; 2 x SFP (mini-GBIC)	Ports: 4 x Gigabit Ethernet	RJ-45 onboard LAN/WAN 10/100/1000 ports: 2; EHWIC slots: 2
Supported Protocol	System Services: SP Services	Network / Transport Protocol: TCP/IP, UDP/IP, RSVP, IPSec, PPPoE, L2TPv3; Routing Protocol: OSPF, IS-IS, BGP, EIGRP, DVMRP, PIM-SM, IGMPv3, GRE, PIM-SSM, static IPv4 routing, static IPv6 routing, policy-based routing (PBR)	n/a	n/a
VPN Capability	Security: Integrated Security Services	Features: Firewall protection, NAT support, hardware encryption, VPN support, MPLS support, Syslog support, content filtering, IPv6 support, Class-Based Weighted Fair Queuing (CBWFQ), Weighted Random Early Detection (WRED), Access Control List (ACL) support, Quality of Service (QoS), Dynamic Multipoint VPN (DMVPN)	Encryption Support: Yes (SECK9 License)	Embedded hardware-based cryptography acceleration (IPsec + SSL): Yes
Integrated Features	Management: Web, CLI, SNMP; Redundancy: Optional redundant power supply; Compliance: RoHS, FCC, CE	Features: Firewall protection, NAT support, hardware encryption, VPN support, MPLS support, Syslog support, content filtering, IPv6 support, CBWFQ, WRED, ACL support, QoS, DMVPN	Encryption Support: Yes (SECK9 License); Regulatory Compliance: CE, UL, FCC	Bundle: Security Bundle with SEC license PAK; Integrated power supply: AC and DC power-supply models