Module 02 Cisco IOS Chapter 08 Operating Cisco Routers Table of Content Router Memory, Processors, and Interfaces The Cisco IOS Software Command-Line Interface Configuring Cisco IOS Software The Cisco IOS Software Boot Process Router Memory, Processors, and Interfaces Router internal components Router physical characteristics Managing configuration files using TFTP Router# copy running-config tftp Address or name of remote host[]? 10.10.10.10 Destination filename [Router-config]? !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 624 bytes copied in 7.05 secs Router# Router# copy tftp running-config Address or name of remote host[]? 10.10.10.10 Source filename[] ?router-config Destination filename [running-config]? Accessing tftp://10.10.10.10/router-config Loading router-config from 10.10.10.10 (via ethernet 0/0) !!!!!!!!!!!!!!!!!!!!!!!!! [OK-642 bytes] The Cisco IOS Software Command-Line Interface Access to CLI: Connecting console interfaces Access to CLI: Connecting AUX interfaces HyperTerminal session properties Configuring an Ethernet interface Router#configure terminal Router(config)#interface ethernet 0/0 Router(config-if)#ip address Router(config-if)#no shutdown Configuring host tables Router(config)#ip host Auckland 172.16.32.1 Router#show host Default domain is not set Name/address lookup uses domain service Name server are Host Auckland Flags (perm, OK) Age ** Type IP Address(es) 172.16.32.1 Save configuration file Router#copy running-config startup-config Destination filename [startup-config]? Building configuration [OK] Cisco IOS Software Boot Process Operation of Cisco IOS Software Operating environment Prompt Usage ROM monitor > or rommon> Failure or password recovery Boot Rom Router(boot)> Flash image upgrade Cisco IOS Router> Normal operation Router Startup Sequence The boot process ROM monitor initializes Stays in ROM Boots the image What is Boot field? monitor in boot ROM or boot flash to F yes Boot no commands Executes boot commands in NVRAM ? Router’s Fallback sequence Executes boot commands in NVRAM Customize Fallback sources Default Fallback sequence Boot system commands (config)# boot system flash boot system tftp boot system rom # copy running-config startup-config Configuration register The configuration register is a 16-bit register in NVRAM 16-bit register 0x 0 0 0 0 0 0 Bit: 16 – 3: 6: 8: 11-12: 13: 15: Boot field Ignore NVRAM contents Break disabled Console line speed Boot ROM if network boot fails Diagnostic and ignore NVRAM 0 0 Configuration register: Boot field (1) 16-bit register 0x 0 0 0 0 0 0 0 0 Bit: 16 Boot field 0x - - - 0 0 0 0 F 1 1 Configuration Register Configuration Register Value Description 0xnnn0 Use Rom monitor mode 0xnnn1 Automatically boot from ROM 0xnnn2 – 0xnnnF Examine NVRAM for boot system commands Router# Show version Router(config)#configure-register register-value Useful Config-register 0x2100 : System bootstrap prompt 0x 0 0 0 0 0 0 0 0x2101 : Boot system from ROM 0x 0 0 0 0 0 0 0x2102 : Boot system from flash 0x 0 0 0 0 0 0 Troubleshooting IOS Boot Failure Configuration file has missing or incorrect boot system statement Incorrect configuration register value Corrupted flash image Hardware failure Summary The router internal components Configuring the Cisco IOS software The Cisco IOS boot process ... Router# ? Exec commands: access-enable Create a temporary Access-List entry access-profile Apply user-profile to interface access-template Create a temporary Access-List entry archive manage archive... running-config Address or name of remote host[]? 10.10.10.10 Source filename[] ?router-config Destination filename [running-config]? Accessing tftp://10.10.10.10/router-config Loading router-config... configuration file Router#copy running-config startup-config Destination filename [startup-config]? Building configuration [OK] Cisco IOS Software Boot Process Operation of Cisco IOS Software Operating