Cisco Catalyst 2960 Series, Configuration Manual

Page: 2218 / 2288

Purpose Command or Action
Displays the trunk configuration of the interface. show interfaces interface-id trunk
Example:
Switch#
show interfaces gigabitethernet1/0/2
Step 9
trunk
(Optional) Saves your entries in the configuration file.
copy running-config startup-config
Example:
Switch# copy running-config startup-config
Step 10
Related Topics
Trunking Modes, on page 2130
Layer 2 Interface Modes, on page 2131
Defining the Allowed VLANs on a Trunk
VLAN 1 is the default VLAN on all trunk ports in all Cisco switches, and it has previously been a requirement
that VLAN 1 always be enabled on every trunk link. You can use the VLAN 1 minimization feature to disable
VLAN 1 on any individual VLAN trunk link so that no user traffic (including spanning-tree advertisements)
is sent or received on VLAN 1.
SUMMARY STEPS
1. enable
2.
configure terminal
3. interface interface-id
4. switchport mode trunk
5.
switchport trunk allowed vlan
{
add
|
all
|
except
|
remove
} vlan-list
6. end
7.
show interfaces interface-id switchport
8.
copy running-config startup-config
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
2136
How to Configure VLAN Trunks