Overview
These routers were common as branch routers during the late 1990s, and into the early 2000’s. The 1760 model does have a 19” (easily rack mountable) form factor, but the rest of the models do not easily rack mount and would need to sit on a shelf. Several models support later IOS versions. To allow use as a branch router that uses the Internet for connectivity back into the Enterprise, several models support advanced security features for CCNA Security preparation. The routers support WICs as well.
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Popularly sold as new in years:
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199? - 2003
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End-of-Sale (EOS) years:
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2003-2006
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Most Recent mainline IOS supported
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12.4
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Most recent T-train IOS supported
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12.4T
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Max Flash (1721)
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32
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Max RAM (1721)
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128
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Max Flash (1760) (32 base + 1 SIMM socket)
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64
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Max RAM (64 base, + 1 DIMM socket)
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128
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Supported Feature Sets Referenced by Other Pages on this Site
- IP
- IP Plus
- IP/FW/IDS/ Plus IPSEC 3DES
- Advanced IP Services
- Advanced Security
Hardware
The 1720 and 1721 models have particular appeal for certifcation in that they support 2 WIC-2T slots, for up to 4 serial interfaces, plus a 10/100 interface that supports 802.1Q. The 1760 has the advantage of support for 2 Voice Interface Cards (VICs) that can be useful when working towards CCNA Voice or CCVP.
Popular models for certification labs:
| Device |
WIC slots |
Built in LAN |
Other built-in |
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1720
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2
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10/100 (RJ-45)
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None
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1721
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2
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10/100 (RJ-45)
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1 VPN module slot
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1760
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2
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10/100 (RJ-45)
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2 Voice Interface Card (VIC) slots
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Cables and other Notes
- The 10/100 ports on all the above models support 802.1Q trunking.
- The 1720/1721 use an external power supply (power brick). When purchasing used, make sure the router comes with the power cord and transformer.
- The 1710 was not considered when creating this page. It has several differences, including a latest IOS of 12.4 mainline (not 12.4T).
Links
Known items that need research or verification
Change History
March 1, 2010: Version 1.0
May 18, 2010: V1.1
Added note regarding 1710 not being included on this page.