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Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
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Chapter 10 Configuring VLANs
Configuring VLANs on the Switch
Configuring VLANs on the Switch
VLANs are either normal range or extended range. VLANs in the normal range are VLANs 2–1000.
VLANs in the extended range are VLANs 1025–4094.
When you configure normal-range VLANs, VLANs 2–1000, you can configure one VLAN at a time or
a range of VLANs, all with a single command. If you configure a range of VLANs, you cannot specify
a name, because VLAN names must be unique.
Note You cannot configure or modify normal-range VLAN 1.
You can use VTP to manage global normal-range VLAN configuration information on your network, but
you cannot manage extended-range VLAN configuration information. To use VTP, you must configure
it before you create any normal-range VLANs. For more information, see Chapter 9, “Configuring
VTP.”
Note With VTP version 3, you can manage extended-range VLANs 1025–4094. These VLANs are propagated
with VTP version 3.
Before configuring extended-range VLANs, VLANs 1025–4094, you must first enable MAC address
reduction. When you enable MAC address reduction, the system commits the IDs for extended-range
VLANs. After you enable MAC address reduction, you cannot disable it as long as any extended-range
VLANs exist.
Note If you wish to use extended-range VLANs and you have existing 802.1Q-to-ISL mappings in your
system, you must first delete the mappings. See the “Clearing 802.1Q-to-ISL VLAN Mappings” section
on page 10-12 for more information.
Creating or Modifying an Ethernet VLAN
To create a new Ethernet VLAN, perform this task in privileged mode:
Note The default VLAN type is Ethernet; if you do not specify the type, the VLAN is an Ethernet VLAN.
Task Command
Step 1
Create a new Ethernet VLAN. set vlan vlan_num [name name] [said said] [mtu mtu]
[translation vlan_num]
Step 2
Verify the VLAN configuration. show vlan [vlan_num]
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