Configuring VLANs

Normal-Range VLAN Overview

Membership Mode

VLAN Membership Characteristics VTP Characteristics

Trunk (IEEE 802.1Q) :

•IEEE 802.1Q— Industry-standard trunking encapsulation.

A trunk port is a member of all VLANs by default, including extended-range VLANs, but membership can be limited by configuring the allowed-VLAN list. You can also modify the pruning-eligible list to block flooded traffic to VLANs on trunk ports that are included in the list.

VTP is recommended but not required. VTP maintains VLAN configuration consistency by managing the addition, deletion, and renaming of VLANs on a network-wide basis. VTP exchanges VLAN configuration messages with other switches over trunk links.

Dynamic access

A dynamic-access port can belong

 

to one VLAN (VLAN ID 1 to

 

4094) and is dynamically assigned

 

by a VLAN Member Policy Server

 

(VMPS).

 

The VMPS can be a Catalyst 6500

 

series switch, for example, but

 

never a Catalyst 2960, 2960-S, or

 

2960-C switch. The Catalyst 2960,

 

2960-S, or 2960-C switch is a

 

VMPS client.

 

You can have dynamic-access ports

 

and trunk ports on the same switch,

 

but you must connect the

 

dynamic-access port to an end

 

station or hub and not to another

 

switch.

VTP is required.

Configure the VMPS and the client with the same VTP domain name.

To participate in VTP, at least one trunk port on the switch or a switch stack must be connected to a trunk port of a second switch or switch stack.

Voice VLAN

A voice VLAN port is an access

 

port attached to a Cisco IP Phone,

 

configured to use one VLAN for

 

voice traffic and another VLAN for

 

data traffic from a device attached

 

to the phone.

VTP is not required; it has no effect on a voice VLAN.

Normal-Range VLAN Overview

Normal-range VLANs are VLANs with VLAN IDs 1 to 1005. If the switch is in VTP server or VTP transparent mode, you can add, modify or remove configurations for VLANs 2 to 1001 in the VLAN database. (VLAN IDs 1 and 1002 to 1005 are automatically created and cannot be removed.)

In VTP versions 1 and 2, the switch must be in VTP transparent mode when you create extended-range VLANs (VLANs with IDs from 1006 to 4094), but these VLANs are not saved in the VLAN database. VTP version 3 supports extended-range VLANs in VTP server and transparent mode.

Configurations for VLAN IDs 1 to 1005 are written to the file vlan.dat (VLAN database), and you can display them by entering the show vlan privileged EXEC command. The vlan.dat file is stored in flash memory. On

 

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Cisco Systems WSC2960XR48FPSI manual Normal-Range Vlan Overview, Vmps
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WSC2960XR48FPSI specifications

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