The Cisco 1721 Modular Access Router is designed to help organizations embrace
the productivity benefits of e-business applications. The Cisco 1721 router enables
e-business by delivering secure Internet, intranet, and extranet access with virtual
private networks (VPNs) and firewall technology. The Cisco 1721 router offers:
Data Sheet
• Wide array of WAN access options,
including high-speed business-class
digital subscriber line (DSL)
• High-performance routing with
bandwidth management
• Inter-virtual LAN (VLAN) routing
• VPN access with firewall option
The Cisco 1721 supports standards-based
IEEE802.1QVLAN routing, whichenables
enterprises to set up multiple VLANs and
route between them for added security
within the internal corporate network.
Powered by Cisco IOS
Cisco 1721 router provides a cost-effective
solution for small and medium businesses
and enterprise small branch offices to
support e-business applications through a
comprehensive feature set in a compact
design.
®
Software, the
The Cisco 1721 router offers the following
key features:
• A RISC processor to support
high-performance routing, encryption,
and broadband services
• One autosensing 10/100 Fast Ethernet
port
• Two WAN interface card (WIC) slots
that support the same data WAN
interface cards as the Cisco 1600, 2600,
and 3700 routers
• One auxiliary (AUX) port (up to
115.2-kbps asynchronous serial)
• One console port
• One internal expansion slot for the
hardware-assistedVPN encryptioncard
(MOD1700-VPN)
Figure 1:
The Cisco 1721 Router
delivers a versatile
e-businessWANaccess
solution.
The Cisco 1700 Series supports the value of end-to-end Cisco network solutions with the following benefits:
• Flexibility—The modular Cisco 1721 adapts easily tofit the needs of growingbusinesses. Interchangeable WAN
interface cardsenable easy additionsor changes in WANtechnologies withoutrequiring a forkliftupgrade of the
entire platform. Modular data slots enable users to tailor data services as needed.
• Security—The Cisco1721 supports hardware-assisted wire-speed TripleDigital 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.
Throughenhanced DSLquality-of-service(QoS) features,performancelevels formission-criticalapplications and
toll-quality voice/data integration are guaranteed.
• Traffic management—The Cisco 1721 is 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 Cisco1721 routeris part ofthe end-to-endCisco VPN solution.VPNs createsecure connections viathe 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
router delivers robust VPN solutions to ensure data privacy, integrity, and authenticity.
The optional VPN hardware encryption module for the Cisco 1721 router 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.
The Cisco1721 router offers integrated security features, including statefulinspection firewall functionalityand IDS
as anoptional Cisco IOSSoftware feature. By deploying Cisco IOS Software firewallfunctionality,customers do not
need to purchase or manage multiple devices, thus simplifying network management and reducing capital costs.
Additionally, remote management applications, such as Cisco Security Device Manager (SDM), make it easier than
ever to deploy and monitor Cisco IOS Firewall and VPN on your Cisco 1721 router.
Cisco IOS Software firewallsecurity features include access controllists (ACLs),user Authentication, Authorization,
and Accounting (such as Password Authentication Protocol/Challenge Handshake Authentication Protocol [PAP/
CHAP], TACACS+,and Remote AccessDial-In User Service[RADIUS]). These security features providethe optimal
level of firewall protection to customers.
The Cisco 1700 Series routers support the Cisco Easy VPN Remote feature that allows the routers to act as remote
VPN clients. As such, these devices can receive predefined security policies from the headquarters’ VPN head-end,
thus minimizing configuration of VPN parameters at the remote locations. This solution makes deploying VPN
simpler for remote offices with little IT support or for large deployments where it is impractical to individually
configure multiple remote devices. While customers wishing to deploy and manage site-to-site VPN would benefit
from Cisco Easy VPN Remote because of its simplification of VPN deployment and management, managed VPN
service providers and enterprises who must deploy and manage numerous remote sites and branch offices with
Cisco IOS routers for VPN will realize the greatest benefit.
The Cisco1700 Series routersalso support theCisco Easy VPNServer feature thatallows a Cisco 1700 router to act
as a VPN head-end device. In site-to-site VPN environments, the Cisco 1700 router can terminate VPN tunnels
initiated bythe remote officerouters using the Cisco Easy VPN Remote. Security policies canbe pushed downto the
remote office routers from the Cisco 1700 router. In addition to terminating site-to-site VPNs, a Cisco 1700 router
running the Unified VPN Access Server can terminate remote access VPNs initiated by mobile and remote workers
running CiscoVPN client softwareon PCs. This flexibility makes it possiblefor mobile andremote workers, such as
sales people on the road, to access company intranet where critical data and applications exist.
Business-Class DSL
The Cisco 1721 router supports business-class DSL through the optional ADSL or G.shdsl WICs.
The Cisco 1721 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 QoS features, performance levels for
mission-critical applications are guaranteed. (See Figure 2.)
Figure 2
The Cisco 1700 Series Deployed with an ADSL WIC
Small Branch
Office
Cisco 6X00
Headquarters
(DSLAM)
ADSLWAN
Cisco 1700 Series
Cisco 7X00
Router with ADSL WIC
When equipped with optional Ethernet WICs,the Cisco1700 Seriessupports atwo- orthree-Ethernet configuration,
enabling deployment with an external broadband modem (such as DSL, cable modem, or wireless modem)—often
supplied bya service provideras a demarcation point and deployment of ademilitarized zone (DMZ).(See Figure 3.)
The Cisco 1700 Series Deployed with an Ethernet WIC and an External DSL or Cable Modem
Internet
DSL/Cable
Modem
Ethernet
Cisco 1700 Series Router
with Cisco IOS Firewall
and an Ethernet WIC
WIC
LAN
Comprehensive Feature Set and Benefits
The Cisco 1721 offers a broad set of features designed to allow businesses to attain maximum benefits on their
investment and to easily deploy e-business solutions. See Table 2 for key features and benefits.
Table 1 Cisco 1721 Key Features and Benefits
FeaturesBenefits
Flexibility and Investment Protection
Modular Architecture
• Wide array of WAN options provide flexibility and
investment protection by accommodating future
technologies while providing a solution to meet
today’s needs
WAN Interface Cards Shared with Cisco 1600, 2600, and
3700 Routers
Full Cisco IOS Support, including Multiprotocol Routing,
QoS
• Offers lower training costs for support personnel
• Protects investments through reuse on various
platforms
• Provides industry’s most robust, scalable, and
feature-rich internetworking software support using
the accepted standardnetworking software for Internet
and private WANs
• Constitutes part of the Cisco end-to-end network
solution
Table 1 Cisco 1721 Key Features and Benefits (Continued)
FeaturesBenefits
Quality of Service (QoS)
Expansion Slot on Motherboard
Complete Security and VPN Capability
Stateful Inspection Firewall
includes context-based access control for dynamic
firewall filtering, denial-of-service detection and
prevention, Java blocking, and real-time alerts)
High-Performance VPN Encryption
VPN module for high-speed, hardware-based encryption)
Device Authentication and Key Management
Key Exchange [IKE], X.509v3 digitalcertification, support
for Certificate Enrollment Protocol (CEP) with certificate
authorities (CAs) such as Verisign and Entrust)
(the Cisco IOS Firewall
(IPSec DES and 3DES
(Internet
• Offers support for advanced QoS features such as the
Resource Reservation Protocol (RSVP), Weighted Fair
Queuing (WFQ), and IP Precedence to reduce recurring
WAN costs
• QoS features (such as committed access rate [CAR],
policy routing, low-latency queuing [LLQ], generic
traffic shaping [GTS], Frame Relay traffic shaping
[FRTS], and RSVP) allocate WAN bandwidth to priority
applications for improved performance
• Allows expandability to support services such as
hardware-assisted encryption
• Allows internal users to access the Internet with
secure, per-application-based, dynamic access control
while preventing unauthorized Internet users from
accessing the internal LAN
• Provides high-speed hardware-assisted encryption up
to T1/E1 performance
• Enables creation of wire-speed VPNs by providing
industry-standard data privacy, integrity, and
authenticity as data traverses public networks
• Ensures proper identity and authenticity of devices
and data
• Enables scalability to very large IPSec networks
through automated key management
VPN Tunneling
Encapsulation (GRE), L2TP, L2F
Cisco Easy VPN Remote• Allows the router to act as remote VPN clientand have
Cisco Easy VPN Server• Allows the router to terminate remote access VPNs
Cisco SDM• Simplifies router and security configuration through
• Allows any standards-based IPSec or L2TP client to
interoperate with Cisco IOS tunneling technologies
VPN polices pushed down from the VPN concentrator
initiated by mobile and remote workers running Cisco
VPN client software on PCs; and allows the router to
terminate site-site VPNs initiated by Cisco IOS routers
using the Cisco Easy VPN Remote feature
smart wizards to enable customers to quickly and
easily deploy, configure and monitor a Cisco access
router without requiring knowledge of Cisco IOS
Command Line Interface (CLI)
Table 1 Cisco 1721 Key Features and Benefits (Continued)
FeaturesBenefits
SupportsADSL and G.shdsl
(Multilink PPP [MLP] with link fragmentation and
interleaving [LFI], LLQ, Weighted Random Early
Detection [WRED], CAR, differentiated services)
Simplified Management and Ease of Deployment
DeviceIntegration
VPN, tunnel server, data/channel serviceunit [DSU/CSU],
and Network Termination 1 [NT1] in a single device)
(integratedrouter,firewall, encryption,
with advanced QoS features
Manageable via Simple Network Management Protocol
(SNMP)
• Provide at-a-glance indications for power, VPN
module, network activity, and interface status
• Allows automatic backup of WAN connection in case
of a primary link failure
• Backup copy of the Cisco IOS Software can be stored
in Flash memory
• Provides high network availability
Hardware/Software Options
Comprehensive WAN Support
The Cisco 1721 supports up to two of the WICs listed in Table 3. These WICs support a wide variety of WAN
technologies: Integrated Services DigitalNetwork (ISDN),asynchronous serialand synchronous serial such asleased
lines, Frame Relay, ADSL, G.shdsl, Switched 56, X.25, and Switched Multimegabit Data Service (SMDS), and
single-port Ethernet.Also available are WICs thatintegrate a DSU/CSUinto the Cisco 1721, eliminatingthe support
costs and complexity of deploying and managing external devices.
Table 2 WAN Support for the Cisco 1721
WICDescription
WIC-1TOne-port serial, asynchronous and synchronous (T1/E1)
WIC-2TTwo-port serial, asynchronous and synchronous (T1/E1)
WIC-2A/STwo-port low-speed serial (up to 128 kbps), asynchronous and synchronous
WIC-1B-S/TOne-port ISDN Basic Rate Interface (BRI) S/T
WIC-1B-UOne-port ISDN BRI U interface with integrated NT1
WIC-1DSU-56K4One-port integrated 56/64-kbps, four-wire DSU/CSU
WIC-1DSU- T1One-port integrated T1/fractional T1 DSU/CSU
WIC-1ADSLOne-port ADSL interface
WIC-1ENETOne-port 10BASE-T Ethernet interface
WIC-1SHDSLOne-port G.shdsl interface
VWIC-1MFT-T1One-port RJ-48 multiflex trunk - T1
VWIC-2MFT-T1Two-port RJ-48 multiflex trunk - T1
VWIC-2MFT-T1-DITwo-port RJ-48 multiflex trunk - T1 with drop and insert
VWIC-1MFT-E1One-port RJ-48 multiflex trunk - E1
VWIC-2MFT-E1Two-port RJ-48 multiflex trunk - E1
VWIC-2MFT-E1-DITwo-port RJ-48 multiflex trunk - E1 with drop and insert
VWIC-1MFT-G703One-port RJ-48 multiflex trunk - E1 G.703
VWIC-2MFT-G703Two-port RJ-48 multiflex trunk - E1 G.703
All Cisco 1700 models are equipped withan internalexpansion slotto supportan optionalfield-installable hardware
VPN encryption module. The VPN encryption module offloads encryption processing from the Cisco 1700 Series
RISC processor, providing performance up to T1/E1 speeds. The VPN encryption module (MOD1700-VPN)
supports a maximum of 100 remote access tunnels.
Cisco IOS Software Feature Sets
Cisco 1721 routers support a full range of Cisco IOS features, including multiprotocol routing, QoS, VPN, firewall/
IDS, and legacy IBM protocol and applications in use today.
The Cisco 1721 router is shipped with the base Cisco IOS feature sets supporting IP routing and standards such as
Network Address Translation (NAT), Open Shortest Path First (OSPF), RADIUS, Remote Monitoring (RMON),
VLAN routing, basic QoS feature (Weighted Fair Queing), and Next Hop Resolution Protocol [NHRP]).
Cisco IOS IP Plus feature sets contain L2TP, L2F, Border Gateway Protocol (BGP), IP multicast, Frame Relay
switched virtual circuit (SVC), RSVP, PPP overEthernet client,NetFlow,theNetware Link Services Protocol (NLSP),
Simple Multicast Routing Protocol (SMRP), the Web Cache Control Protocol (WCCP), and the Network Timing
Protocol (NTP). In addition, enhanced QoS features are also supported (LLQ, FRTS, RSVP, CEF, WRED, DiffServ,
MLPP with LFI).
IPSecencryption isoffered inspecial encryption featuresets (PlusIPSec 56and Plus IPSec3DES). To buildan IPVPN,
the recommended feature sets are IP/Firewall Plus IPSec 56 or IP/Firewall Plus IPSec 3DES.
For a detailed list of features and memory requirements for a given feature set, see Cisco IOS 1700 Release Notes.
Network Management and Installation Tools
The Cisco 1721 router supports a range of network-management and ease-of-installation tools.
Cisco Security Device Manager (SDM) is an intuitive, easy to use, web-based device management tool embedded
within the Cisco IOSaccess routers.SDM enables resellers and customersto quicklyand easily deploy,configure and
monitor a Cisco access router without requiring knowledge of Cisco IOS Command Line Interface (CLI). Through
smart wizards, SDM can automate best practices for NAT, ACLs, VPN and firewall deployment. Other common
LAN, WAN, and routing protocol configurations can alsobe easily performed through SDM. Network resellersand
customers can further fine-tunerouter configurationsfor changing businessneeds andpreview the Cisco IOS CLIfor
each configuration through SDM.
CiscoWorks2000, the industry-leading Web-based network management suite, provides the ability to remotely
configure, administer, monitor, and troubleshoot the Cisco 1721 router; and increased visibility into network
behavior to quickly identify performance bottlenecks and long-term performance trends. It also provides
sophisticated configuration tools to optimize bandwidth and utilization across expensive and critical WAN links in
the network.
CiscoView, partof CiscoWorks2000, is a Web-based tool that graphically provides real-time status of the Cisco 1721
router. It can drill down to display monitoring information on interfaces and provide dynamic status, statistics, and
comprehensive configuration information.
CiscoWorks Small Network Management Solution (SNMS) is a comprehensive, Web-based network management
solution that provides a powerful set of monitoring, configuration, and management tools to simplify the
administration of smallto medium business networks andworkgroups that contain up to 20 Cisco internetworking
products(switches, routers,hubs, and accessservers). CiscoWorks SNMSis anidealsolution forcompanies that need
server monitoring and network management from a single application to optimize performance and maximize
network productivity. With CiscoWorks SNMS, Cisco providesa cost-effective and user-friendlysolution that helps
Cisco customers make the optimal use of their resources. The solution provides the following:
• Web interface for all applications—CiscoWorks SNMS can be used from any browser in the network with the
appropriate user authentication.
• Simpleintegrated installation,autodiscovery,and automatedimport of devices using SNMPreduces complexities
and overall setup time associated with managing the network.
• CiscoWorks SNMS provides standards-based multivendor management. The WhatsUp Gold application in
CiscoWorks SNMS allows administrators to view live network information, including the status of all hosts,
servers, workstations, routers, other devices, and services.
• CiscoWorks SNMS grows and adapts to the changing devices in a dynamic network. Regular device updates are
provided viadownloadable files from Cisco.com. Thisscenario ensures thatusers can managethe most currently
available Cisco devices without waiting for new versions of CiscoWorks SNMS to be released.
Cisco ConfigMaker is a Microsoft Windows wizard-based tool designed to configure a small network of Cisco
routers, switches, hubs, and other network devices from a single PC. This tool makes it easy to configure value-add
security features suchas theCisco IOSFirewall FeatureSet, IPSecencryption, NAT,the DynamicHost Configuration
Protocol (DHCP) server, and to establish VPN policies (including QoS and security).
Cisco 1700 Series
The Cisco 1700 Series enables deployment of a cost-effective, seamless network infrastructure for small and
medium-sized businesses andsmall enterprise branch offices. TheCisco 1700 Series access routersinclude the Cisco
1710, 1721,1751, 1760 (offeredas a base model), Cisco 1751-V and Cisco 1760-V (offered as a multiservice-ready
model.)
The Cisco 1751 and Cisco 1760 Modular Access Routers are optimized for multiservice data and voice solutions.
The Cisco 1721 router is a modular device optimized for data-access applications. The Cisco 1710 Security Access
Router features comprehensive security with VPNs, Cisco IOS Firewall, and advanced routing functionality in an
all-in-one device.
Service and Support
Technical Support Services
Technical Support Services for the Cisco 1721 are available through Cisco SMARTnet™ and SMARTnet Onsite
service programs.Cisco SMARTnetsupport augments the resources ofyour operations staff;it provides them access
to a wealth of expertise, both on line and via telephone, the ability to refresh their system software at will, and a
range of hardware Advance Replacement options.
Cisco SMARTnet Onsite provides all SMARTnet services and complements the hardware Advance-Replacement
featureby addingthe services ofa fieldengineer,offering supportthatcan becritical for thoselocations wherestaffing
is insufficient or unavailable to perform parts-replacement activities. Table 4 gives features and benefits of Cisco
SMARTnet support.
Table 3 Cisco SMARTnet Features and Benefits Technical Support Services
FeaturesBenefits
Cisco SMARTnet
Support
Cisco SMARTnet
Onsite Support
• Access 24 x 7 to software updates
• Web access to technical repositories
• Telephone support through the Technical
Assistance Center (TAC)
• Advance Replacement of hardware parts
• Enables proactive or expedited issue
resolution
• Lowers total cost of ownership by
utilizing Cisco expertise and
knowledge
• Minimizes network downtime
Technical Support Services Delivery
Cisco SMARTnet support is available to customers from both Cisco directly and through Cisco channel partners.
Partners purchasing direct from Cisco may offer Cisco Branded Resale of Cisco SMARTnet Software. Partners
purchasing through distribution may offer Packaged Cisco SMARTnet Software.
For partners supportingthe Cisco1721 withtheir ownservice andsupport infrastructure,System IntegratorSupport
98 (SIS98) is available.
• New Zealand - PTC107, PTC200, PTC211, PTC270, CTR3
• European Union + Switzerland: Directive 1999/5/EC
• Russia - CTR2, CTR3, CTR21, ITU-G.992.1, ITU-G991.2
• Belarus - CTR3, CTR21
• Czechia - CTR2, CTR3, CTR21
• Poland - CTR3, PB-TE ITU-G.992.1
• Hungary - CTR2, CTR3, CTR21, ITU-G.992.1
• Singapore - IDA: TS-PSTN1, TS-ISDN1, TS-ADSL
• Taiwan - PSTN01, IS6100, ID002
• Brazil - CTR3, CS-03
• Mexico - CTR3, CS-03, FCC part 68
• South Africa- CTR3
The Cisco 1700 series, including the Cisco 1721, is in compliance
with the requirements of the countries for distribution. The Cisco
1700 Series conforms to Safety, EMI, Immunity, and Network
homologation standards. Details can be obtained through your
Cisco reseller or account manager.
Corporate Headquarters
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
www.cisco.com
Tel: 408 526-4000
800 553-NETS (6387)
Fax: 408 526-4100
Cisco Systems has more than 200 offices in the following countries and regions. Addresses, phone numbers, and fax numbers are listed on the
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Czech Republic • Denmark • Dubai, UAE • Finland • France • Germany • Greece • Hong Kong SAR • Hungary • India • Indonesia • Ireland
Israel • Italy • Japan • Korea • Luxembourg • Malaysia • Mexico • The Netherlands • New Zealand • Norway • Peru • Philippines • Poland
Portugal • Puerto Rico • Romania • Russia • Saudi Arabia • Scotland • Singapore • Slovakia • Slovenia • South Africa • Spain • Sweden
Switzerland • Taiwan • Thailand • Turkey • Ukraine • United Kingdom • United States • Venezuela • Vietnam • Zimbabwe
All other trademarks mentioned in this document or Web site are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company.
(0203R) 07/02 LDI-4080 gm/ms5/03
European Headquarters
Cisco Systems Europe
11 Rue Camille Desmoulins
92782 Issy-les-Moulineaux
Cedex 9
France
www-europe.cisco.com
Tel: 33 1 58 04 60 00
Fax: 33 1 58 04 61 00
Cisco Web site at www.cisco.com/go/offices
Americas Headquarters
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134-1706
USA
www.cisco.com
Tel: 408 526-7660
Fax: 408 527-0883
Asia Pacific Headquarters
Cisco Systems, Inc.
Capital Tower
168 Robinson Road
#22-01 to #29-01
Singapore 068912
www.cisco.com
Tel: +65 317 7777
Fax: +65 317 7799
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