• Cisco Config Templates
• cisco_sg300
• Cisco Switches
• SNMP Monitoring on Cisco Switches

• Wildcard mask calculator to convert a subnet mask into a wildcard mask required for ACLs

• delete_sdm_from_cisco_flash
• cisco_password_recovery
• setting_password_on_cisco_routers
• upgrading_ios_on_cisco
• clearing_configs_on_cisco_routers_and_switches
• how_to_save_a_cisco_config_file
• Reload Cisco Router

• dual internet links NATing with PBR and IP SLA
• how_to_disable_stp
• VLANs in Cisco Routers

• Router log timestamp entries are different from the system clock when the NTP is configured
• date_and_time_on_cisco
• cisco_logging_debugging_and_adsl_troubleshooting
• netflow_in_cisco
• stop_logging_messages_from_interrupting_your_configuration
• Troubleshooting Cisco CPU Utilisation

• Cisco Router as a DHCP Server
• use_a_cisco_router_as_a_dns_server
• running_an_ftp_server_behind_a_cisco_router_with_nat
• dhcp_relay_in_cisco_router
• cisco_router_as_a_dhcp_client

• regenerate_ssh_keys_on_cisco
• lock_down_ssh_on_cisco_routers
• Configure SSH

• cisco_scripts

Resources for scripting in cisco:

• Execute multiple commands at once
• IOS Tclsh resources
• Example: Tcl script with command-line parameters

• Cisco Router Users

• Cisco VPN

When typing any command, you can press ? to show help information. This can show available commands, and also syntax for specific commands. You can also use TAB to complete commands.

• Clear the NAT translation tables: clear ip nat translation *
• Go to beginning of line: CTRL+A, to end of line: CTRL+E
• Delete the startup config (will show setup mode after reload): erase startup-config
• Show host table: show hosts (temp = cached lookup, perm = host added with “ip host”)
• Disable console logging: no logging console
• Turn off all debugging: “undebug all” or “un all”

Show the Running Config

• Turn off the annoying MORE behaviour:terminal length 0(term len 0)
• Show the configuration:show running-config(show run)
• Show the startup config:show startup-config(show start)
• Revert changes from startup config:copy startup-config running-config(copy start run) - or just reboot the router
• Commit changes to startup config:copy running-config startup-config(copy run start)
• Another method (does the same thing):wr
• Start displaying config at specific line containing word: show run | begin word
• Display all lines with given word: show run | include word
• show run | section word

Routing

• Show routes: show ip route

Interfaces

• List interfaces: show ip int brief
• Show particular interface: show run interface Dialer0
• Show trunk ports: show interface trunk

Insert ACLs using Line Numbers

• To show ACL rules with line numbers: show ip access-list
• To remove a line (eg. 50): no 50
• To add a rule at a line number (eg. 50): 50 permit udp any any eq domain