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