1	Interconnecting Cisco Networking Devices Module 7 Managing Cisco Devices
2	Overview Internal Components of a Cisco Router Router Boot Sequence Managing the Configuration Register Resetting Passwords Backing up and Restoring the Cisco IOS Backing up and Restoring Cisco Router Configurations Using Cisco Discovery Protocol (CDP) Building a Host Table Using DNS to Resolve Names Checking Network Connectivity
3	Internal Components
4	Router Boot Sequence Router performs a POST Bootstrap locates the IOS software IOS looks for valid configuration in NVRAM If located, it will load and run this file, otherwise it starts the setup program
5	Configuration Register 0x2102 indicates a normal boot 0x2142 indicates a boot ignoring the NVRAM (startup-config) show version to check the current value Router(config)# config-register 0x2142
6	Resetting Passwords Boot router and interrupt boot sequence w/ a break Change the config register to 0x2142 > o/r 0x2142 Reload the router > I Enter Privileged Mode Router> en copy start run (merge start w/ run) Change password Router(config)# enable secret newpassword Reset the config register to 0x2102 Router(config)# config-register 0x2102 copy run start (save the config) Reload the router Router# reload
7	Backing up and Restoring the IOS Verify Flash Memory Router# sh flash Back up Cisco IOS Router# ping 192.168.0.120 Router# copy flash tftp Restore Cisco IOS Router# ping 192.168.0.120 Router# copy tftp flash
8	Backing up and Restoring Configurations Verify Configurations Router# sh run Router# sh start Back up Cisco IOS Router# ping 192.168.0.120 Router# copy run tftp Restore Cisco IOS Router# ping 192.168.0.120 Router# copy tftp run
9	Using Cisco Discovery Protocol (CDP) Proprietary protocol designed to help administrators collect information about locally attached and remote devices Independent of TCP/IP and routing Router# sh cdp Shows send timer and hold time Router# sh cdp neighbors Shows directly connected neighbors Router# sh cdp neighbors detail Router# sh cdp traffic # of CDP packets sent and received and errors Router# sh cdp interface CDP status by interface
10	Disabling CDP Disabling by interface Router(config)# int s0 Router(config-if)# no cdp enable Disabling for the whole router Router(config)# no cdp run
11	Building a Host Table Provides name resolution only on the router it was built upon. Default port is 23 for telnet Router(config)# ip host 1900switch 192.168.2.125 Router# sh hosts Router# 1900switch (Opens telnet connection) Router# sh sessions Router# no ip host 1900switch
12	Using DNS to Resolve Names Provides name resolution only for administrators logged into the router Router(config)# ip domain-lookup Router(config)# ip name-server 192.168.1.70 Router(config)# ip domain-name nhdc.com Router# sh hosts
13	Checking Network Connectivity Router# ping 192.168.1.5 Router# traceroute 192.168.1.5
14	Summary Internal Components of a Cisco Router Router Boot Sequence Managing the Configuration Register Resetting Passwords Backing up and Restoring the Cisco IOS Backing up and Restoring Cisco Router Configurations Using Cisco Discovery Protocol (CDP) Building a Host Table Using DNS to Resolve Names Checking Network Connectivity