Configuring a Range of Switch Interfaces - dummies

Configuring a Range of Switch Interfaces

By Edward Tetz

Configuring a range of interfaces or ports on your switch prevents you from having to configure each of these interfaces individually. Putting your switch into Interface Range Configuration mode allows you to configure multiple ports at the same time, reducing your work when making major configuration changes on your switch.

You denote a range for interfaces by specifying the starting interface and the last interface in the range. The following code example uses this technique to configure interfaces 8 through 12. Once the proper Configuration mode is specified, you use the switchport access command to place these ports in vlan 5.

Trunk ports are ports used for inter-switch connections, while access ports are used to connect devices to your switch. The switchport command is used to change between Trunk mode and Access mode. The following example lists the other directives available to the switchport command:

Switch1#configure terminal
Switch1(config)#interface range fastEthernet 0/8 , fastEthernet 0/12
Switch1(config-if-range)#switchport ?
  access         Set access mode characteristics of the interface
  host           Set port host
  mode           Set trunking mode of the interface
  nonegotiate    Device will not engage in negotiation protocol on this
  port-security  Security related command
  priority       Set appliance 802.1p priority
  protected      Configure an interface to be a protected port
  trunk          Set trunking characteristics of the interface
  voice          Voice appliance attributes
Switch1(config-if-range)#switchport access vlan 5

With ports 8 through 12 now associated with VLAN 5, you can verify this configuration using the trusty show command.

In this case, the most appropriate command is show vlan brief, whose output appears in the next command example. Be sure to notice the difference in the VLAN names that appear in this listing. VLAN 2 is assigned a descriptive name; VLAN 15 is assigned a name that is not very descriptive; VLAN 10 is not assigned a name at all, making it even less descriptive.

If you want to ensure the proper devices and ports are assigned to the proper VLANs, use descriptive names on your VLANs.

Switch1#show vlan brief
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/1, Fa0/2, Fa0/3, Fa0/4
                                                Fa0/5, Fa0/6, Fa0/7
2    Executives                       active
5    VLAN0005                         active    Fa0/8, Fa0/9, Fa0/10, Fa0/11
10   VLAN0010                         active
15   VLAN_15                          active
20   Test_VLAN                        active
1002 fddi-default                     act/unsup
1003 trcrf-default                    act/unsup
1004 fddinet-default                  act/unsup
1005 trbrf-default                    act/unsup