Huawei is the leader, but Cisco is the master

1. Cisco Router Fabric
   1) CPU
   2) Flash Flash (Cisco OS)
   3) NVRAM Non-Volatile Random Access Memory (user-configured save commands)
   4) ROM Read Only Storage
   5) RAM Random Access Storage (device running commands )
2. Basic configuration:
   Router> User mode enable
   Router# Privileged mode configure terminal
   Router(config)# Global configuration mode interfacegigabitEthernet 0/0
   Router(config-if)# Interface mode
   Router#show running-config Query current configuration (RAM)
   Router (config )#line console 0
   Router (config-line)#exec-timeout 0 0 Configure console session time to never timeout
   Router (config)#line console 0 Enter console
   Router(config-line)#password 123 Configure console port password
   Router (config-line)#logging synchronous Configure output log synchronization
   Router (config)#no ip domain-lookup Disable DNS lookup

Router(config)#enable password 321 Set the privileged mode plaintext password
Router(config)#enable secret abc Set the privileged mode ciphertext password

3. Cisco router and switch password settings
   Router(config)#line console 0
   Router(config-line)#password 123
   Router(config-line)#login Configure console port password
   Router(config)#enable password 123 Configure privileged mode plaintext password
   Router( config)#enable secret 123 Configure privileged mode ciphertext password

5. Cisco router password recovery
   principle: To bypass the startup-config configuration when the router starts, the value of the configuration register (NVRAM) needs to be modified.
   Under normal circumstances, the value of the register: 0x2102 - the configuration of startup-confg to start and run normally, the value of the modified register: 0x2142 - indicates that the new machine is started without loading the configuration file
   Steps:
   Press and hold Ctrl+Break (pause) during the restart process, Interrupt the loading configuration, modify the value and restart
   Rommom1>confrg 0x2142
   Rommon2>reset
   to enter the privileged mode, read the user configuration into the
   Router> enable
   Router#copy startup-config running-config
   Change the password, and modify the configuration
   Router(config)#enable secret 123
   Router (config)#config-register 0x2102

6. Cisco switch password recovery (understanding)
   steps:
   re-plug the switch power, and press and hold the MODE button, the switch prompts to release the button, initialize the Flash
   Switch: flash_init Change
   the config.text file to config.old, and start the switch after completion
   : renamefalsh:config.textflash:config.old
   Switch:boot
   and then change the name of the configuration file back
   Switch#renameflash:config.old flash:config.text
   Load the configuration file manually, then enter the configuration mode to change the password
   Switch#copy flash:config.text system:running-config

7. Cisco device remote management
   router:
   Router(config)#line vty 0 2 enable remote virtual port
   Router(config-line)#login load configuration
   Router(config-line)#password 123 set user password
   Router(config)#enable secret abc set Privileged mode ciphertext password

   Switch: First configure the ip for the switch vlan 1, then enable the remote, and set the password.
   If the remote switch is not in the same network, you need to configure the switch with a gateway
   Switch(config)#ip default-gateway 192.168.1.254 to achieve network connectivity.

8. Attachment: Huawei Cisco simple command comparison
   router command:
   
   

switch: