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To see a comparison of the products, review Table 1 below.
Table 1
Cisco 1721 and 1720 Product Comparison
Feature
Routing Performance
(based on 64-byte packet)
DRAM (default/maximum)
Flash (default/maximum)
IEEE 802.1Q VLAN Routing
Encryption Module LED Indicator
The Cisco 1700 Series supports the value of end-to-end Cisco network solutions with the following benefits:
• Flexibility—The modular Cisco 1721 and 1720 adapt easily to fit the needs of growing businesses.
Interchangeable WAN interface cards enable easy additions or changes in WAN technologies without requiring
a forklift upgrade of the entire platform. Modular data slots enable users to tailor data services as needed.
• Security—The Cisco 1721 and 1720 support hardware-assisted wire-speed Triple Digital Encryption Standard IP
Security (3DES IPSec) VPN encryption (using optional VPN module), a Cisco IOS Software-based stateful
inspection firewall, and an intrusion detection system (IDS) that allows customers to keep their data safe.
• Business-class DSL—Business-class DSL is delivered through the optional asymmetric DSL (ADSL) or
symmetrical high-bit rate DSL (G.shdsl) WICs. The Cisco 1700 Series business-class DSL solution combines the
cost benefits of DSL service with the advanced routing capability required for business use of the Internet.
Through enhanced DSL quality-of-service (QoS) features, performance levels for mission-critical applications and
toll-quality voice/data integration are guaranteed.
• Traffic management—The Cisco 1721 and 1720 are based on Cisco IOS Software, the accepted standard for
Internet operations. Cisco IOS Software allows traffic prioritization by user or application, ensuring that the most
strategic e-business applications and time-sensitive applications perform as expected.
E-Business Applications
VPN and Security
The Cisco 1721 and 1720 routers are part of the end-to-end Cisco VPN solution. VPNs create secure connections
via the Internet to connect geographically dispersed offices, business partners, and remote users while providing
security, traffic prioritization, management, and reliability equal to that of private networks.
By supporting industry standards, IPSec, Layer 2 Tunneling Protocol (L2TP), and DES and 3DES, the Cisco 1721
and 1720 routers deliver robust VPN solutions to ensure data privacy, integrity, and authenticity.
The optional VPN hardware encryption module for Cisco 1721 and 1720 routers further optimizes VPN encryption
performance. By offloading encryption tasks to the VPN module, the router processor is freed to handle other
operations. The VPN module accelerates the rate at which encryption occurs, speeding the process of transmitting
secure data, a critical factor when using 3DES encryption.
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Cisco 1721
12,000 packets per second
32 MB/96 MB
16 MB/16 MB (Nonupgradable)
Yes
Yes
Cisco Systems, Inc.
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Cisco 1720
8,400 packets per second
32 MB/48 MB
8 MB/16 MB
No
No