Basic Cisco Commands

Information about Basic Cisco Admin Tasks 

This document describes many of the common and very basic Cisco tasks an admin will perform.  

  

Some Basic Tasks 

• Configuring interface/port 
• Enable port/int 
• Configure Wireless LAN Controller AP speed and duplex  

Very Basic Cisco Commands  

• To show status of interface and other info  
  • show int status mod X (where X=module or blade number)  
• show int status module 4 | inc 41  (to show port 41) 
  • show int gX/XX (where X=module, XX=port number)  
• int g7/2 
  • show run int int 

• Check interface status with "sh int g#/#" where the letter is the interface type (g=gigabit, f=fastethernet) and the #'s are the module/port  
• Change port/interface configuration  
• To change description:  
  • switch#configure terminal switch(config)#interface fa0/1 switch(config-if)#description “This is 1st Port of My Switch” switch(config-if)#end switch#  
  • To remove: no description  
• select range of ports to configure  
  • switch# config t  
  • switch(config)#int range gi1/1 - 24 
• To change speed,etc..  
  • switch# config t switch(config) int gx/x switch(config) speed 100 switch(config) duplex full switch(config) end 
• to enable port  
  • switch# config t switch(config) interface gX/XX switch(config) no shutdown switch(config) end 
• to disable port  
  • switch# config t switch(config) interface gX/XX switch(config-if) no description switch(config-if) switchport access vlan 1 switch(config-if) shutdown switch(config-if) end 
• to set vlan on interface  
  • Enter configuration commands, one per line.  End with CNTL/Z. site1_CORE_6509_2(config)#int g4/40 site1_CORE_6509_2(config-if)#switchport access vlan 850 site1_CORE_6509_2(config-if)#end site1_CORE_6509_2#show int status mod 4 | inc 40 Gi4/40       "site1_ilbl_e45 connected    850        a-full  a-100 10/100/1000BaseT 
• To save backup and write current  
  • [optional] Backup your old configuration switch#copy startup-config startup-config.241207 
  • Save your running configuration (so that it will start at boot) switch#copy running-config startup-config 
• To resest module or 'blade'  
  • type hw-module module 12 reset 
• To see other cisco devices attached to specific equipment use "sh cdp neigh"  
  • for additional details on a specific device you see use "sh cdp neigh g#/# detail" where the g#/# is the interface of the device you are logged onto for the deive you want to look at. 
• Check your root bridge for vlans with "sh spanning-tree root"  
• Check the HSRP state of your sup engines with "sh redundancy"  
• Check how your traffic is routing with "sh ip route", use the "| inc 10.xx." to check for specific routes  
• Check the active HSRP route for specific vlans with "sh standby brief"  
• Find the port a specific mac address is on, use "sh mac-add | inc xxxx" where xxxx is the last 4 of the mac address.  
• Find what mac addresses are on a specific port, use "sh mac-add int Gx/xx" where gx/x if the interface you want to look at (g1/14 would be a gig port on module 1, interface 14)  
• To restart a module and bring it back online use "hw-module module # reset".  
• Tell the switch to restart at a later time  
  • switch# reload at mmm or hhh:mmm or switch# reload in mmm 
• To Configure a Wireless LAN Controller Access Point speed and duplex.  
  • Login to the WLC through Putty and issue the command "config ap ethernet duplex full speed 100 site1-WAP_Name_1"