Cisco Systems 2960 Manual De Usuario
13-13
Catalyst 2960 and 2960-S Switch Software Configuration Guide
OL-8603-09
Chapter 13 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.
extended-range VLANs. The display includes VLAN status, ports, and configuration information.
For more details about the show command options and explanations of output fields, see the command
reference for this release.
reference for this release.
Configuring VLAN Trunks
These sections contain this conceptual information:
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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. The switch supports IEEE 802.1Q encapsulation.
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. The switch supports IEEE 802.1Q encapsulation.
You can configure a trunk on a single Ethernet interface or on an EtherChannel bundle. For more
information about EtherChannel, see
information about EtherChannel, see
Ethernet trunk interfaces support different trunking modes (see
). You can set an interface as
trunking or nontrunking or to negotiate trunking with the neighboring interface. To autonegotiate
trunking, the interfaces must be in the same VTP domain.
trunking, the interfaces must be in the same VTP domain.
Trunk negotiation is managed by the Dynamic Trunking Protocol (DTP), which is a Point-to-Point
Protocol. However, some internetworking devices might forward DTP frames improperly, which could
cause misconfigurations.
Protocol. However, some internetworking devices might forward DTP frames improperly, which could
cause misconfigurations.
Table 13-3
VLAN Monitoring Commands
Command
Purpose
show interfaces [vlan
vlan-id]
vlan-id]
Display characteristics for all interfaces or for the specified VLAN configured on the switch.
show vlan [id vlan-id]
Display parameters for all VLANs or the specified VLAN on the switch.