| Purpose | Command |
| To See running config file | Show running-config or sh run |
| Displays configuration saved in NVRAM | Show startup-config |
| To see IP info of interfaces | Show ip interface brief |
| To see statistics of all interfaces | Show interfaces |
| To see specific item from running configuration | Show interface f0/0 [Only see the info of the specific interface f0/0 ] sh run | section line [Only see the info of all line sections]
[If you want to see from that line where ‘ip’ word is present to last line] show run | exclude ip [If you want to see all lines but not to expect ip word related lines] show run | include ip [If you want to see all lines only included ip word related lines, not others]
|
| Displays the system clock | Show clock |
| Displays all users connected to the router | Show users |
| To Disconnect specific remote users or
To Disconnect specific remote users | Clear line 2 [2 means line number]
Clear line vty 0 |
| To set idle time of remote session | Exec-timeout 1 |
| Displays history of Cisco IOS | Show history |
| Displays info about Flash memory | Show flash |
| Displays info about loaded Cisco IOS software | Show version |
| Displays the ARP table of the router | Show arp |
| Displays the IPv4 routing table of the router | Show ip route |
| Displays the configured hostnames and their corresponding IP addresses of the router | Show host |
| Displays status of configured Layer 3 protocols | Show protocols |
| Display the CPU utilization for a Cisco device at five minute intervals. | Show process cpu |
| Display the total, used and available memory on a Cisco device. | Show memory |
| Verify the operational status of fans, temperature and power supplies. In addition list the percentage of power supply utilization and what amount is available | show environment all |
| Verify that CDP is enabled, update timer, hold timer and CDP version. | Show cdp |
| To show remote users | Show users |
| To show ssh information | Show ssh |
| To change hostname(itbd) of a router | Hostname itbd |
| How to assign a Local Name(remote) to an IP address(10.1.1.1) [we can use the configured hostname for telnet or ping.like→ telnet remote] | Ip host remote 10.1.1.1
|
| Configure a MOTD Banner for Router | banner motd #Welcome to IT-Bangladesh# |
| To enable DNS lookup | ip name-server 192.168.100.10 |
| To turn off the automatic name resolution | no ip domain-lookup |
| To get IP info automatically | Ip add dhcp |
| To resolve domain name | Ip domain-lookup |
| To set DNS Server IP | Ip name-server 8.8.8.8 |
| To set enable password(cisco) | Enable password cisco |
| To set secret password | Enable secret cisco |
| To encrypt all password | Service password-encryption |
| To get IP info automatically into VPCS | Ip dhcp |
| To set IP address(10.1.1.2/8) & Gateway(10.1.1.1) into VPCS | Ip 10.1.1.2/8 10.1.1.1 |
| Delete all routes | Router#clear ip route * |
| To see all IP information of VPCS | Show ip |
| To remove all the configuration commands you entered and initialize your Cisco device’s configuration | Router#erase startup-config Router#reload |
| To view the logs of the Cisco devices to which you have logged in via Telnet/SSH (Execute this command from remote machine) | # terminal monitor |
| To set Message of the day (MOTD) Banner | Banner motd ~ MOTD Banner ~ |
| To set Login Banner | Banner login ~ Login Banner ~ |
| To set exec Banner | Banner exec ~You are authorized person ~ |
| To set timeout session for remote clients | Ip ssh time-out 5 |
| To set authentication retries | Ip ssh authentication-retries 3 |
