13-4
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 13 Configuring VLANs
Configuring Normal-Range VLANs
For more detailed definitions of access and trunk modes and their functions, see Table 13-4 on
page 13-16.
When a port belongs to a VLAN, the switch learns and manages the addresses associated with the port
on
a per-VLAN basis. For more information, see the “Managing the MAC Address Table” section on
page 7-19.
Configuring Normal-Range VLANs
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
V
LAN 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
VL
ANs (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. See the
“Configuring Extended-Range VLANs” section on page 13-10.
Configurations for VLAN IDs 1 to 1005 are written to the file v
lan.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 a Catalyst 3750-E switch, thevlan.dat file is stored in flash memory on the stack master.
Stack members have a vlan.dat file that is consistent with the stack master.
Caution You can cause inconsistency in the VLAN database if you attempt to manually delete the vlan.dat file.
If you want to modify the VLAN configuration, use the commands described in these sections and in the
command reference for this release. To change the VTP configuration, see Chapter 14, “Configuring
VTP.”
You use the interface configuration mode to define the port membership mode and to add and remove
ports from VLANs. The results of these commands are written to the running-configuration file, and you
can display the file by entering the show running-config privileged EXEC command.
You can set these parameters when you create a new normal-range VLAN or modify an existing VLAN
in
the VLAN database:
• VLAN ID
• VLAN name
• VLAN type (Ethernet, Fiber Distributed Data Interface [FDDI], FDDI network entity title [NET],
TrBRF, or TrCRF, Token Ring, Token Ring-Net)
• VLAN state (active or suspended)
Voice VLAN A voice VLAN port is an access port attached to a Cisco IP
Ph
one, configured to use one VLAN for voice traffic and
another VLAN for data traffic from a device attached to the
phone.
For more information about voice VLAN ports, see
Chapter 15, “Configuring Voice VLAN.”
VTP is not required; it has no effect on
a v
oice VLAN.
Table 13-1 Port Membership Modes and Characteristics (continued)
Membership Mode VLAN Membership Characteristics VTP Characteristics
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