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Use or creation of aliases in Cisco equipment

Use or creation of aliases in Cisco equipment

Sometimes I found some commands that use a lot but are still long to write using the tab in these cases you can set an alias to reduce the command. However, it is necessary to know that this must be configured on each computer on the network. Here are the commands needed to complete the setup.

Router1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router1(config)#alias exec smc show mac-address-table
Router1(config)#alias exec sv show vlan
Router1(config)#end
Router1#

Make use of aliases is very common in Unix users, to reduce the time to write long or difficult commands to remember. You can create aliases for commands that contain lots of information as widely used for commands.

Switch1# smc
          Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    ----
  92    0008.020a.15c8    DYNAMIC     Fa0/13
  92    000d.56d5.c46e    DYNAMIC     Fa0/3
  92    000e.3880.5d7f    DYNAMIC     Gi0/2
  92    000e.d76f.1780    DYNAMIC     Gi0/2
  92    000e.d7a5.748c    DYNAMIC     Gi0/2
  92    0014.223c.310b    DYNAMIC     Fa0/33
 121    000e.d7a5.748c    DYNAMIC     Gi0/2
 121    0011.9591.b33d    DYNAMIC     Gi0/2
 121    0014.2226.31fa    DYNAMIC     Gi0/2
 121    0014.7cc3.32c0    DYNAMIC     Gi0/2
 911    000e.d7a5.748c    DYNAMIC     Gi0/2
 912    000e.d7a5.748c    DYNAMIC     Gi0/2
 913    000e.d7a5.748c    DYNAMIC     Gi0/2
Total Mac Addresses for this criterion: 13
Switch1#

The key to making a good alias is to select a password that is short and easy to remember, of course it is important to select an alias that do not conflict with any command that already exists. Aliases can be used as part of another command. For example the following command is used as shrinking the show vlan summary command.

Biblio-Users#sv su    
Biblio-Users#sv summary       
Number of existing VLANs           : 53
Number of existing VTP VLANs      : 53
Number of existing extended VLANs : 0

You can find lots of uses for the alias, for example when working with scripts you can use alias to standardize some computers.

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