| A | B |
|---|
| The default source for Cisco IOS software startup depends on | the hardware platform |
| Locating IOS image sequence | NVRAM, Flash, TFTP server |
| 0x---0 | Use ROM monitor mode |
| Use ROM monitor mode means | manually boot using the b command |
| 0x---1 | Automatically boot from ROM |
| boot from ROM | default if router has no Flash |
| 0x---2 to 0x---F | Examine NVRAM for boot system command |
| The order in which the router looks for system bootstrap information depends on the | boot field setting in the configuration register. |
| You can change the default configuration register setting with the | global configuration-mode command config-register |
| The configuration register is a | 16-bit register in NVRAM |
| The lowest 4 bits of the configuration register (bits 3, 2, 1, and 0) form | the boot field |
| Set the configuration register value to 0x100 if you need to | enter the ROM monitor |
| To check the boot field setting, use the | show version command |
| The advantage of loading a system image from Flash is that information stored in Flash memory is | not vulnerable to network failures that can occur when loading system images from TFTP servers |
| The system image in ROM will likely be a | subset of Cisco IOS software, that lacks the protocols, features, and configurations of full Cisco IOS software |
| The TFTP server can be | another router, or it can be a host system |
| The TFTP host can be any system that has TFTP software loaded and | operating and able to receive files from the TCP/IP network |
| 1st step preparing to copy software between the TFTP host and Flash memory in the router | check to make sure that you can access the TFTP server over the TCP/IP network. ( ping ) |
| 2nd step preparing to copy software between the TFTP host and Flash memory in the router | On the router, check to make sure that you can see and write into Flash memory |
| 3rd step preparing to copy software between the TFTP host and Flash memory in the router | Verify that the router has sufficient room in Flash memory to accommodate the Cisco IOS software image. |
| 4th step preparing to copy software between the TFTP host and Flash memory in the router | On the UNIX TFTP server, check to make sure you know the file or file space for the Cisco IOS software image. |
| commands used to check the IOS image name on the tftp server | dir or ls |
| show flash | verify that you have sufficient memory on your system for the Cisco IOS software that you want to load |
| if insufficient free memory for tftp file transfer | obtain a smaller Cisco IOS software image or increase the available memory on the router. |
| always backup your current IOS before | upgrading to a newer version |
| Cisco IOS name cpa25-cg-1; the cpa25 means | the platform on which the image runs |
| Cisco IOS name cpa25-cg-1; the cg means | identifies the special capabilities and feature sets supported in the image |
| Cisco IOS name cpa25-cg-1; the 1 means | where the image runs and whether it has been zipped or compressed |
| Cisco IOS name gs7-k-mz; the mzmeans | run location = RAM & compression = zipped |
| copy flash tftp | copy the system image to a TFTP server |
| IOS image files can be renamed during transfer from | flash to tftp server |
| One reason for this upload IOS image to tftp server | provide a fallback copy of the current image prior to updating the image with a new version |
| copy tftp flash begins by requesting | the IP address of the remote host that will act as the TFTP server |
| during copy tftp flash you will be asked if you | are willing to erase Flash memory |
| During the copy tftp flash routine each exclamation point (!) means that | one User Datagram Protocol (UDP) segment has successfully transferred. |
| During the copy tftp flash routine, the series of Vs indicates | successful checksum verification of a segment. |
| reload | reboots the router |
| copy tftp flash | allow you to download the image that you previously uploaded to the TFTP server |
| After you enter the copy tftp flash command, the system prompts you for the | IP address (or name) of the TFTP server. |
| If you attempt to copy into Flash memory a file that is already there | This file will be deleted when you copy the new file into Flash memory |
| If you attempt to copy into Flash memory a file that is already there & there is room for both copies in flash | , the first copy of the file still resides within Flash memory, but is rendered unusable in favor of the newest version, |
| the oldest IOS image in Flash will be | listed with the [deleted] tag when you use the show flash command. |
| If you abort the copy tftp flash process | the newer file will be marked [deleted] because the entire file was not copied and is therefore not valid. |
| Stop router boot process | CNTRL + Break within 60 seconds |
| o/r 0x2142 | changed configuration register during password recover on 2500 routers |
