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Catalyst2950 and Catalyst2955 Switch Software Configuration Guide
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Chapter17 Configuring VLANs
Configuring Normal-Range VLANs
Configuring Normal-Range VLANs
Normal-range VLANs are VLANs with VLAN IDs 1 to 1005. If the sw it ch is in VT P server or
transparent mode, you can add, modify or remove configurations for VL ANs 2 to 10 01 in t h e V LAN
database. (VLAN IDs 1 and 1002 to 1005 are automatically cre ate d and ca nnot be rem oved.)
Note When the switch is in VTP transparent mode and the EI is installe d, you can also create extended-range
VLANs (VLANs with IDs from 1006 to 4094), but these VLANs are not saved in the VLAN database.
See the “Configuring Extended-Range VLANs” section on page 17-12.
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.
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 th ese sections and in the
command reference for this release. To change the VTP configuration, see Chapter18, “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)
•Maximum transmission unit (MTU) for the VLAN
•Security Association Identifier (SAID)
•Bridge identification number for TrBRF VLANs
•Ring number for FDDI and TrCRF VLANs
•Parent VLAN number for TrCRF VLANs
•Spanning Tree Protocol (STP) type for TrCRF VLANs
•VLAN number to use when translating from one VLAN type to an othe r
Note This section does not provide configuration details for most of these parameters. For complete
information on the commands and parameters that control VLAN configuration, refer t o the comma nd
reference for this release.