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Different routers in the Cisco product line have different capabilities regarding the loading of IOS from a remote location Some of the higher-end routers, such as the 7000- and 7500-series, have enough memory facilities to allow a new version of IOS to be loaded remotely, and the new IOS to take effect when the router is next booted or when a reload is issued These routers also allow you to keep more than one version of IOS held in memory, in case you need to fall back to a prior version because of a problem with the new version In all probability, the most common router implemented in a Cisco internetwork is the 2500-series, because it is the cheapest and provides the functionality needed to bring a small remote office online to the corporate internetwork One of the compromises in delivering a product like the 2500 is that it is limited in available memory A 2500 router runs its IOS from flash memory rather than ROM To upgrade the IOS in this type of router, the flash memory must first be erased, so that the new version of IOS can become the first file in flash memory and hence be the one from which the router is running To safely erase the contents of flash memory, you must be running at least a small operating system from somewhere other than flash; otherwise the router will stop running This is where the Cisco Rxboot image comes into play This boot image is a small operating system that runs from ROM chips on the router motherboard, and provides just enough functionality to boot the router with empty flash memory and load a new version of the IOS into flash Because the 2500-series is the most complex to upgrade remotely, and probably the most common device we need to upgrade remotely, we will examine its upgrade process in detail here The Rxboot ROM Program Rxboot supports Telnet and TFTP operations, but does not support routing, SNMP, routers with more than one interface enabled, TACACS, or IP unnumbered These limitations have implications when you want to remotely upgrade router configuration
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The first step is to shut down all interfaces except for the serial port on which the router is to receive the new version of IOS In addition, if the serial port normally uses IP unnumbered, it must
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command must be entered into the configuration of the router in global configuration mode, prior to the upgrade To execute an upgrade process, you must have a computer to use for Telnet access to the remote 2500, and a TFTP server somewhere on the internetwork that has loaded onto it a copy of the new version of the IOS We covered TFTP server configuration in Chap 3 when we discussed loading configuration files over a LAN The same TFTP server configuration can be used for this purpose Preview of the Upgrade Process We will discuss each step in detail, but it is useful here to check a summary view of what we are about to do 1Check that the TFTP server can ping the remote router to be upgraded, and configure the remote router to use a default gateway once its routing functionality has been disabled 2Load the new version of IOS on to the TFTP server, ready for loading onto the remote router 3Play it safe by completing a backup of the remote router's IOS and configuration file, should things go wrong 4Reboot the router to use the Rxboot image, by loading its operating system from the ROM chips 5Copy the new version of IOS to the remote router's flash memory and check that the checksum is the same as the file on the TFTP server, to ensure that nothing happened to the new version of IOS in transit 6Boot the router from flash memory and check to make sure everything is functional before moving on to the next router Executing a Remote Upgrade Let's consider a situation in which a remote 2501 needs to have its IOS upgraded, as shown in Fig 7-20
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