Cisco Device Interface Description – Command & Configuration


Router Interface descriptions are very useful for network administrators especially during the event of troubleshooting, configuration change of link migration is required.

Adding “Description” of Interface is useful for administrative purposes since this helps us to remember the port functionality and In fact the circuit details.


Related – CEF Cisco

The recommended uses for the Cisco Router/Switch interface description command are –

  • For Identifying the interface
  • Mentioning whom to reach out to during event of interface down
  • Documenting the circuit information (Ckt Detail)
  • Using description for notes on circuit etc

Historical modifications of “Description” Command are –

  • Release 4.0(0)N1(1a) – This command was introduced.
  • Release 5.0(3)N1(1) – Support for Layer 3 interfaces was added.
  • Release 5.1(3)N1(1) – Support for virtual Ethernet interface was added.

The command can be used in following Interface types –

  • Ethernet interface
  • Management interface
  • Subinterfaces
  • Virtual Ethernet interface

Below is the configuration example where Interface Description is used on Interface Fa0/0 of Router “R1” –

R1(config) interface Fa0/0

R1(config-if) description “ATnT WAN Link Connection to Arizona – Ckt ID 567894

Note – A description of an interface is locally significant and can be up to 240 characters long.


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