Managing Cisco IOS Software Module 5 Managing Cisco IOS Software

Router startup- A review Powers up using a ____________ to find and check all hardware During boot sequence, following loaded into RAM: ___________________ loads initial base instructions The _______________________ A _______________________ If one is not available, the _________________ _______________ - which prompts the user for a basic router configuration.

Bootstrap program Loads initial base instructions Located in _____________

Search process involved in finding ________ image file Part of the router's boot sequence involves "deciding" from where to obtain the IOS version. The order is: ________________________ _________________ to see if a particular source for the IOS has been designated in the startup file. If no special configuration register settings have been used, then the router defaults to…

Search process cont… Look in______________________ If loading the IOS from Flash fails, then the router tries looking for a __________________ If this fails, loads a limited version of IOS from _________________________

Configuration register values The order in which the router looks for IOS information depends on the _________________________ in the configuration register

Configuration register values cont… ___________________________________ setting with the _______________________ command: ____________________ Ex: Router(config)# config-register 0x100F Configuration register is 16-bit (4 hex digits) __________________ of the config register form the _____________________ 0000 = 0 0001 = 1 0010 = 2 1111= F

Configuring the IOS locations and file names If the config register indicates to check in NVRAM (the config file) - default setting Use the __________________ command to indicate __________________________

Configuration File Commands executed line by line Starts routing processes, supply addresses for interfaces, set media characteristics etc. Found in one of following places- checked for in this order: 1st NVRAM 2nd TFTP Server 3rd Console (setup)

Troubleshooting IOS boot problems Causes of IOS boot-up problem Configuration file has _____________________ _____________________________________ __________________________________ Use the last line of the show version command for the configuration register value ____________________________ Hardware failure

Recall There are 2 types of software required for a router or switch to function. What are they? Where are each by default found? What is the startup configuration called when it is loaded into RAM?.

IOS Naming convention

Configuration File backup…

Another easier method of backup Capture the output of the show running-config command Practice this and see the class demo Don’t forget to take out the “extra stuff” from the text file version

How about copying the IOS to Flash?

If the IOS image gets erased or corrupt ________________________________________ ROMmon mode can be identified from the rommon 1 > prompt In our 2500 series router, it is simply the _____ prompt If an IOS image is located in flash try to boot from that image (run that image) with the following command: >____________________:c2600-is-mz.121-5

Labs Chapter 5 essential labs: Managing Configuration files with TFTP – 5.2.3 Password Recovery Procedures – 5.2.6a (see supplement for this lab)