Cisco IOS Flash Memory fault recovery method

Cisco IOS Flash Memory fault recovery method is currently a popular solution for Flash Memory faults. The FLASH upgrade method is transmitted using TFTP. This article is based on the readers of the CISCO 2600 series IT168. Step 1: After the Flash Memory deletion command is executed, the device enters the rommon status. Step 2: we need to set the rommon status to conform to our TFTP transmission environment. The specific command is as follows: rommon 3> set www.2cto.com PS1 = rommon!> IP_ADDRESS = 172.18.16.76 (set the IP address of the router. In reality, we can only use port 1 to restore the flash operation.) IP_SUBNET_MASK = 255.255.255.0 (set the subnet mask of Port 1 on the router) DEFAULT_GATEWAY = 172.18.16.65 (set the default gateway address of the router) TFTP_SERVER = 172.18.16.2 (set the address of the TFTP server used to transmit FLASH files) TFTP_FILE = quake/rel22_Jan_16/c2600-i-mz (set the file name of the FLASH file on the TFTP server for easy download) Step 3: Then run the tftpdnld command to start downloading. Tip: the TFTP server must be created. Therefore, we should find a PC and configure the IP address of the TFTP server set above, then download the professional TFTP server creation tool from the CISCO website or find a third-party software. The creation method is very simple. Just select the directory to be released. After using the sh flash command for a long time, a large number of CRASHINFO files are found, which occupy a large amount of FLASH space. If these files are too many and the FLASH storage space is full, the FLASH upgrade will be affected. So what is CRASHINFO? How can we clear them? The Crashinfo file is the file left when the vro is restarted. It is the record file for restarting. we can delete them. Use the Delete command. Sometimes we execute sh flash and find two partitions. The FLASH capacity may be divided into two partitions mainly due to the following two reasons. One is that someone runs the partition command to divide a FLASH into two zones; the other is that there are two FLASH files inserted on the router, so that each FLASH will be displayed in an independent partition. For example, I use show version on my device to display two partitions: www.2cto.com Router # show version Processor board ID JAD06100CD1 (1588947843) M860 processor: part number 0, mask 49 Bridging software. x.25 software, Version 3.0.0. 2 Ethernet/IEEE 802.3 interface (s) 32 K bytes of non-volatile configuration memory. 8084 K bytes of processor board System flash (Read/Write) 8084 K bytes of processor board System flash (Read/Write) generally for easy upgrade To better utilize space resources, we need to merge FLASH partitions. Step 1: display the FLASH on the vro: Router # dir flash? Www.2cto.com Flash: 1: Flash: 2: Step 2: delete the flash: 2: delete the Router # erase flash: 2: Step 3: merge two flashRouter (config) # partition flash 1 (merge two FLASH files into one FLASH1) Router # After the write memory is modified, the following information is displayed: Router # show version Processor board ID JAD06100CD1 (1588947843) M860 processor: part number 0, mask 49 Bridging software. x.25 software, Version 3.0.0. 2 Ethernet/IEEE 802.3 interface (s) 32 K bytes of non-volatile configuration me Mory. www.2cto.com 16384 K bytes of processor board System flash (Read/Write) Configuration register is 0x2102 [/U] tip: You can also use show FLASH to check whether flash is partitioned, if multiple partitions exist, System flash directory, partition 1, System flash directory, and partition 2 are displayed in the displayed information. Conclusion: The probability of IOS and FLASH problems is not very high. In case of a fault, make sure that you do not have to worry about it, because the IOS and FLASH faults are regarded as software faults, we can all solve this problem by downloading and uploading the corresponding software program, instead of having to spend money to change the device as if there were a hardware problem.