11-8
Software Configuration Guide—Release 12.2(25)SG
OL-7659-03
Chapter11 Configuring Layer 2 Ethernet Interfaces
Configuring Ethernet Interfaces for Layer 2 Switching
Port Vlans allowed and active in management domain
Fa5/8 1-6,10,20,50,100,152,200,300,303-305,349-351,400,500,521,524,570,801-8
02,850,917,999,1002-1005
Port Vlans in spanning tree forwarding state and not pruned
Fa5/8 1-6,10,20,50,100,152,200,300,303-305,349-351,400,500,521,524,570,801-8
02,850,917,999,1002-1005
Switch#
Configuring an Interface as a Layer 2 Access Port
Note If you assign an interface to a VLAN that does not exist, the interface is not operational until you create
the VLAN in the VLAN database (see the “Configuring VLANs in Global Configuration Mode” section
on page 10-5).
To configure an interface as a Layer 2 access port, perform this task:
This example shows how to configure the Fast Ethernet interface 5/6 as an access port in VLAN 200:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface fastethernet 5/6
Switch(config-if)# shutdown
Command Purpose
Step1 Switch(config)# interface {fastethernet |
gigabitethernet | tengigabitethernet}
slot
/
port
Specifies the interface to configure.
Step2 Switch(config-if)# shutdown (Optional) Shuts down the interface to prevent traffic flow until
configuration is complete.
Step3 Switch(config-if)# switchport Configures the interface for Layer 2 switching:
•You must enter the switchport command once without any
keywords to configure the interface as a Layer 2 port bef ore
you can enter additional switchport commands with
keywords.
•Required only if you previously entered the no switchport
command for the interface.
Step4 Switch(config-if)# switchport mode access Configures the interface as a Layer 2 access port.
Step5 Switch(config-if)# switchport access vlan
vlan_num
Place the interface in a VLAN.
Step6 Switch(config-if)# no shutdown Activates the interface. (Required only if you had shut down the
interface.)
Step7 Switch(config-if)# end Exits interface configuration mode.
Step8 Switch# show running-config interface
{fastethernet | gigabitethernet}
slot
/
port
Displays the running configuration of the interface.
Step9 Switch# show interfaces [{fastethernet |
gigabitethernet | tengigabitethernet}
slot
/
port
] switchport
Displays the switch port configuration of the interface.