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Gaining access to the router to upgrade software or modify the configuration can be done in several ways Table 5-1 summarizes these methods Table 5-1: Methods of Administrative Access
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Console port Auxiliary port Telnet HTTP TFTP SNMP
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"Dumb" terminal (VT100) using a serial line connection "Dumb" terminal (VT100) using a modem connection Virtual terminal (VT100) or scripted access using a TCP/IP-based network connection Web browser using a TCP/IP-based network connection Direct connection via Ethernet or Token Ring cable, or using a TCP/IPbased network connection Simple Network Management Protocol connection over a TCP/IP-based network connection
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The most common access method when setting up one or a small number of new routers is via a console port connection This direct connection allows configuration of the basic parameters necessary to connect to the network Usually this first set of parameters is completed, then the router is connected to the network, and then administrative access is gained via a network connection
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The console port is on the rear of the router On the Cisco 4700 (Figure 5-1), the console port is a male DB-25 serial connector to which an RJ-45 to DB-25 female terminal adapter can be connected An RJ-45 to RJ-45 rollover cable is then used to connect to a DB-9 serial or other type of terminal adapter that is compatible with the terminal, host, or PC used to connect to the router console
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Figure 5-1: Cisco 4700 router, rear view When using a Windows system to connect to the router console, you connect the serial connector
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to one of the PC serial ports Make sure you know which serial port (COM 1, COM 2, etc) is going to be used, and configure the terminal software serial port with the following parameters: Baud rate Data bits Stop bits Parity Flow control Terminal type 9600 8 1 None None VT100
Once connected, the router should be accessible with a few presses of the Enter key If it isn't, make sure you have configured your terminal software to use the correct serial port (usually one of COM ports 1 4) Then, if the router is still not responding, verify that you are using the serial adapters and rollover cable provided with the router and that the connectors are securely attached (Also, having missed this obvious detail a time or two ourselves, make sure the router is powered on)
The minimum configuration that allows administrative access on a TCP/IP network includes assigning a password, an "up" network interface (using the no shutdown command), an IP address, a subnet mask, and the routing protocol used in your network Note that you also need to have a password set on the vty ports to allow administrative access via the LAN On a lab router, our initial configuration included the following: interface Ethernet0 ip address 101102 2552552550 media-type 10BaseT ! router ospf 1 network 10000 000255 area 0 ! The routing protocol specification in this example, OSPF allows the router to acquire the information necessary for dispatching network traffic through the router from local subnets to those on other routers From this basic configuration, the router can be connected to the network, and a Telnet or HTTP session can be established for further configuration This also allows for configuration via Cisco's ConfigMaker, scripts, or other tools, as well as provides a path for online upgrades to the IOS via TFTP
Once a router is connected to the network, access via a Telnet client is straightforward You can use the Telnet application included with Windows, or any of a large number of third-party and shareware Telnet applications NoteOne very helpful application that offers several enhanced features is CRT from Van Dyke Technologies, Inc It supports Telnet, VT100 terminal emulation, Telnet proxy firewall support, automated login capabilities, and modem-dialing support using Windows TAPI You can download an evaluation of CRT from http://wwwvandykecom/products/crt/indexhtml To connect to a router on the network using Telnet, configure the application to use VT100 terminal emulation and enter the router's host name or IP address If the router is on the network and configured properly, you will be prompted for a password just as you would in a console connection