C H A P T E R 1 Cisco 1721 Router Overview This chapter introduces the Cisco 1721 router, also referred to in this guide as the router, and covers the following topics: • Key Features • Back Panel Ports and LEDs • Front Panel LEDs • Router Memory • Unpacking the Router • Additional Required Equipment Cisco 1721 Router Hardware Installation Guide 78-13834-02 1-1
Chapter 1 Cisco 1721 Router Overview Key Features Key Features The Cisco 1721 router (see Figure 1-1) is a small, modular desktop router that links small- to medium-size remote Ethernet and Fast Ethernet LANs over one to four WAN connections to regional and central offices. Table 1-1 lists the key features of the router.
Chapter 1 Cisco 1721 Router Overview Key Features Table 1-1 Key Features Feature One Fast Ethernet (10/100BASE-TX) port Two Cisco WAN interface card (WIC) slots Description • Operates in full- or half-duplex mode (with manual override available). • Supports autosensing for 10- or 100-Mbps operation. • Supports IEEE 802.1Q VLAN encapsulation. • Supports a combination of any two of the following WICs: ISDN BRI, 56-kbps DSU/CSU, FT1/T1 DSU/CSU, high-speed serial, dual-serial, ADSL, G.
Chapter 1 Cisco 1721 Router Overview Back Panel Ports and LEDs Back Panel Ports and LEDs This section describes the router back panel ports and LEDs, which are shown in Figure 1-2 and described in Table 1-2 and Table 1-3.
Chapter 1 Cisco 1721 Router Overview Front Panel LEDs Table 1-2 Back Panel Connectors (continued) Connector/Slot Label/Color Description WIC slot 0 (WIC0) No label Supports one Cisco WIC. For detailed information, refer to the Cisco WAN Interface Cards Hardware Installation Guide, which comes with every card. WIC slot 1 (WIC1) No label Supports one Cisco WIC. For detailed information, refer to the Cisco WAN Interface Cards Hardware Installation Guide, which comes with every card.
Chapter 1 Cisco 1721 Router Overview Front Panel LEDs Front Panel LEDs WIC0 Table 1-4 WIC1 ETH PWR ACT/CH0 ACT/CH0 ACT OK ACT/CH1 ACT/CH1 COL 65537 Figure 1-3 Front Panel LEDs LED Label Color Description PWR Green On means that DC power is being supplied to the router. OK Green On means that the router has successfully booted up and the software is functional. This LED blinks during the power-on self-test (POST).
Chapter 1 Cisco 1721 Router Overview Router Memory Table 1-4 LED Label Front Panel LEDs (continued) Color Description Green Serial and DSU/CSU cards—Blinks when data is being sent to or received from the port on the card in the WIC1 slot. WIC1 ACT/CH0 ISDN cards—On solid when the first ISDN B channel is up for the card in the WIC1 slot. 2-port serial cards—Blinks when data is being sent to or received from the first port on the 2-port card in the WIC1 slot.
Chapter 1 Cisco 1721 Router Overview Router Memory Types of Memory The Cisco 1721 router has the following types of memory: • Dynamic random-access memory (DRAM)—This is the main storage memory for the router. DRAM is also called working storage. It contains the dynamic configuration information. The Cisco 1721 router stores a working copy of the Cisco IOS software, dynamic configuration information, and routing table information in DRAM.
Chapter 1 Cisco 1721 Router Overview Unpacking the Router cisco 1721 (MPC860P) processor (revision 0x101) with 36864K/12288K bytes of memory. Processor board ID VEN0539000D (3033334544), with hardware revision 0000 MPC860P processor: part number 5, mask 2 Bridging software. X.25 software, Version 3.0.0. 1 Ethernet/IEEE 802.3 interface(s) 1 FastEthernet/IEEE 802.3 interface(s) 2 Serial network interface(s) 1 Virtual Private Network (VPN) Modules(s) 32K bytes of non-volatile configuration memory.
Chapter 1 Cisco 1721 Router Overview Additional Required Equipment Table 1-6 Additional Required Equipment Equipment When You Use It Ethernet hub A hub connects pieces of network equipment (including the Cisco 1721 router) to create a network. You can use a 10-, 100-, or 10/100-Mbps hub with the Cisco 1721 router. Ethernet switch A switch connects pieces of network equipment (including the Cisco 1721 router) to create a network.
