Cisco Catalyst 3750-X User Manual

15-14
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 15 Configuring VLANs
Displaying VLANs
Displaying VLANs
Use the show vlan privileged EXEC command to display a list of all VLANs on the switch, including
extended-range VLANs. The display includes VLAN status, ports, and configuration information.
Table 15-3 li
sts the commands for monitoring VLANs.
For more details about the show command options and
explanations of output fields, see the command
reference for this release.
Configuring VLAN Trunks
These sections contain this conceptual information:
• Trunking Overview, page 15-14
• Encapsulation Types, page 15-16
• Default Layer 2 Ethernet Interface VLAN Configuration, page 15-17
• Configuring an Ethernet Interface as a Trunk Port, page 15-17
• Configuring Trunk Ports for Load Sharing, page 15-22
Trunking Overview
A trunk is a point-to-point link between one or more Ethernet switch interfaces and another networking device
such as a router or a switch. Ethernet trunks carry the traffic of multiple VLANs over a single link, and you
can extend the VLANs across an entire network.
Two trunking encapsulations are available on a
ll Ethernet interfaces:
• Inter-Switch Link (ISL)—Cisco-proprietary trunking encapsulation.
• IEEE 802.1Q— industry-standard trunking encapsulation.
Ta ble 15-3 VLAN Monitoring Commands
Command Command Mode Purpose
show interfaces [vl
an
vlan-id]
Privileged EXEC Display characteristics for all interfaces or for
the specified VLAN configured on the switch.
show vlan [id vlan-id] Privileged EXEC Display parameters for all VLANs or the
s
pecified VLAN on the switch.

Cisco Catalyst 3750-X Specifications

General

Brand	Cisco
Model	Catalyst 3750-X
Category	Switch
Language	English