Backup and upgrade of the Routing Switching Operating System (1)

Based on security considerations, network administrators need to back up the configuration information of network devices and IOS devices. If you need to deploy new features on network devices, in many cases, you need to upgrade the IOS version.
Accidentally deleting IOS by mistake or failing to upgrade IOS, it is common to enter the ROMMONROMMON status after restart, Which is abbreviated as rom monitor. This article introduces two methods for IOS backup and recovery.

Problem: It is difficult to try the operating system of network devices.
Many people who want to test CISCO certification often suffer from drills without equipment. A training center in Beijing opens an experimental environment for some VIP students free of charge based on their business development. In addition, many complex functions are configured and implemented on the topology composed of these devices. However, students often plug in the Console line, which causes great damage to the Console port. Based on the above considerations, the training center has established a remote lab on the basis of the original training lab. Most of the lab environments are isolated. That is to say, students have little access to real equipment.
The lab has also made some provisions, such as some dangerous command erase flash. However, some students do not comply with these Rules, resulting in IOS damage to some devices. Some devices are no longer available and can only enter the ROMMON status. Normal routing and forwarding functions and software configuration are not allowed. In this mode, most of the commands in the original IOS cannot be used.
When the network administrator fixes these devices, the Administrator first checks the configuration of config-register. The configuration of config-register should be 0x2102, it can be confirmed that IOS has suffered a fatal injury. In addition, the IOS features of some network devices have been upgraded. You also need to update these devices after obtaining new IOS devices. The network maintenance requirements of the Training Center are as follows:

Upgrade the IOS version of some vswitches to support more features.
Repair the damaged router IOS.

Tip:

In the experiment environment, IOS upgrades are also common. For example, if a CISCO 2950 switch is frequently suspended, the switch that is suspended does not have any warning information. After the switch is restarted, it returns to normal. By upgrading the IOS version of The vswitch from 12.11EA1 to the version later than 12.12 (EA2), the fault will disappear.