Chapter 13 Configuring VLANs

Configuring Normal-Range VLANs

When you save VLAN and VTP information (including extended-range VLAN configuration information) in the startup configuration file and reboot the switch, the switch configuration is selected as follows:

If the VTP mode is transparent in the startup configuration, and the VLAN database and the VTP domain name from the VLAN database matches that in the startup configuration file, the VLAN database is ignored (cleared), and the VTP and VLAN configurations in the startup configuration file are used. The VLAN database revision number remains unchanged in the VLAN database.

If the VTP mode or domain name in the startup configuration does not match the VLAN database, the domain name and VTP mode and configuration for the first 1005 VLANs use the VLAN database information.

If VTP mode is server, the domain name and VLAN configuration for the first 1005 VLANs use the VLAN database information

Caution If the VLAN database configuration is used at startup and the startup configuration file contains extended-range VLAN configuration, this information is lost when the system boots up.

Default Ethernet VLAN Configuration

Table 13-2shows the default configuration for Ethernet VLANs.

Note The switch supports Ethernet interfaces exclusively. Because FDDI and Token Ring VLANs are not locally supported, you only configure FDDI and Token Ring media-specific characteristics for VTP global advertisements to other switches.

 

 

 

 

Table 13-2

Ethernet VLAN Defaults and Ranges

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Parameter

 

Default

Range

 

 

 

 

 

 

 

 

 

 

 

 

VLAN ID

 

1

1 to 4094.

 

 

 

 

 

 

 

Note Extended-range VLANs (VLAN

 

 

 

 

 

 

 

IDs 1006 to 4094) are not saved in

 

 

 

 

 

 

 

the VLAN database.

 

 

 

 

 

 

 

 

 

 

 

 

VLAN name

 

VLANxxxx, where xxxx

No range

 

 

 

 

 

 

represents four numeric digits

 

 

 

 

 

 

 

 

(including leading zeros) equal

 

 

 

 

 

 

 

 

to the VLAN ID number

 

 

 

 

 

 

 

 

 

 

 

 

 

IEEE 802.10 SAID

100001 (100000 plus the

1 to 4294967294

 

 

 

 

 

 

VLAN ID)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

MTU size

 

1500

1500 to 18190

 

 

 

 

 

 

 

 

 

 

 

Translational bridge 1

0

0 to 1005

 

 

 

 

 

 

 

 

 

 

 

Translational bridge 2

0

0 to 1005

 

 

 

 

 

 

 

 

 

 

 

 

VLAN state

 

active

active, suspend

 

 

 

 

 

 

 

 

 

 

 

 

Remote SPAN

 

disabled

enabled, disabled

 

 

 

 

 

 

 

 

 

 

 

 

Private VLANs

 

none configured

2 to 1001, 1006 to 4094.

 

 

 

 

 

 

 

 

 

 

 

Catalyst 3750-E and 3560-E Switch Software Configuration Guide

 

 

 

 

 

 

 

 

13-8

 

 

 

 

 

OL-9775-02

 

 

 

 

 

 

 

 

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Cisco Systems 3750E manual Default Ethernet Vlan Configuration, Parameter Default Range, VLANxxxx, where, 13-8