Figure 7-20: Internetwork configuration for remotely upgrading a 2500 router in Software

Encoder EAN13 in Software Figure 7-20: Internetwork configuration for remotely upgrading a 2500 router

Figure 7-20: Internetwork configuration for remotely upgrading a 2500 router
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First, Telnet to the 2501 router and issue the following command: 2501>ping 193111 Unless you get success at the ping level, you are not going to get very far, so it's worth checking this before we go any further Next, all serial ports other than the one we will use for the upgrade must be shut down and the ipdefault-gateway command entered, as follows: 2501(config)#interface serial 1 2501(config-int)#shutdown 2501(config-int)#exit 2501(config)#ip default-gateway 2101815 2501(config)#<Ctrl-Z> 2501#write memory No change will be seen to the routing table of the 2501 router at this stage The ip defaultgateway command does not take effect until the routing process is disabled Loading the new version of IOS onto the TFTP server can be done many ways, from a software distribution disk, from Cisco's Internet site, or loading onto the TFTP server from a router already running the new IOS version Whichever method you choose, you need to know the filename used Let's look at saving the existing IOS to the TFTP server as a fallback consideration To save the IOS image file to the TFTP server, you must know the image filename, which can be determined by issuing the show flash all command A sample screen output shown in Fig 721 displays the router's IOS image filename, which in is 10_3_7ip in this case
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Figure 7-21: Screen output of the show flash all command
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The commands, subsequent router prompts, and responses to save this filename to the TFTP server are seen in Fig 7-22
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Figure 7-22: Screen output of the copy flash TFTP command to save a router's IOS to a TFTP server
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Now we start the real work The 2501 router must be booted from ROM to use the Rxboot program as its operating system To achieve this, the configuration register on the 2501 must be changed from 102 in hex, to 101 in hex, which is achieved as follows: 2501#conf t 2501(config)#config-reg 0x101 2501(config)#<Ctrl-Z> 2501#reload At this stage, the Telnet session you have established to the router will be terminated while it reloads its operating system from boot ROM For many, this is nerve-wracking the first time they attempt the process Don't worry Everybody has to do this for the first time once, and the process does work well
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After you give the router a few minutes to reload, you should be able to Telnet back in to it, and instead of the familiar login prompt, you will see the following prompt: 2501(boot)> To get into Enable mode, you will have to type the Enable password, and not the Enable secret The Rxboot program does not recognize the Enable secret Next we want to load the new IOS from the TFTP server Let's again play it safe by checking that the 2501 router can ping the TFTP server Assuming that all is okay, we can proceed If something has happened on the internetwork to prevent IP connectivity from the 2501 to the TFTP server, that must be resolved before we can continue The new IOS is downloaded with the copy tftp flash command as shown next 2501(boot)#copy tftp flash IP address or name of remote host [255255255255] 193111 Name of file to copy "New IOS filename" Copy "new IOS filename" from 193111 into flash address space [confirm] <Enter> Erase flash address space before writing [confirm] <Enter> loading from 193111 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The exclamation points indicate that a data transfer is in progress The next stage is to verify that the file was transmitted successfully without alteration from the source You can check this by verifying that the checksum shown at the end of the display from the copy tftp flash command matches that of the new IOS image as reported on the software distribution materials (either a disk, or as stated on the Cisco Internet site) If the checksum values don't match, again execute the copytftp flash command If after several attempts the checksums still don't match, try to reload the original file before executing yet again If noisy line is introducing errors into the new IOS image as it is downloaded (remember TFTP uses UDP and not TCP, so there is no error correction), you should not boot the router from flash until the noise problem has been fixed and a good IOS version has been loaded into flash Assuming that the new IOS image is loaded successfully, you can return the router to normal operation as follows: 2501(boot)#conf t 2501(config)#config-reg 0x102 2501(config)#no ip default-gateway 2101815 2501(config)#<Ctrl-Z> 2501#reload Once the reload has executed and you can Telnet back in to the router, you can remove the shutdown command from the Serial 1 port and the 2501 should be functioning with a new version of
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