1-12
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring VLANs
Configuring Extended-Range VLANs
• Although the switch or switch stack supports a total of 1005 (normal-range and extended-range)
VLANs with the IP base or IP services feature set and 255 VLANs with the LAN base feature set,
the number of routed ports, SVIs, and other configured features affects the use of the switch
hardware. If you try to create an extended-range VLAN and there are not enough hardware resources
available, an error message is generated, and the extended-range VLAN is rejected.
• In a switch stack, the whole stack uses the same running configuration and saved configuration, and
extended-range VLAN information is shared across the stack.
Creating an Extended-Range VLAN
You create an extended-range VLAN in global configuration mode by entering the vlan global
configuration command with a VLAN ID from 1006 to 4094. The extended-range VLAN has the default
Ethernet VLAN characteristics (see Table 1-2) and the MTU size, private VLAN, and RSPAN
configuration are the only parameters you can change. See the description of the vlan global
configuration command in the command reference for the default settings of all parameters. In VTP
version 1 or 2, if you enter an extended-range VLAN ID when the switch is not in VTP transparent mode,
an error message is generated when you exit VLAN configuration mode, and the extended-range VLAN
is not created.
In VTP version 1 and 2, extended-range VLANs are not saved in the VLAN database; they are saved in
the switch running configuration file. You can save the extended-range VLAN configuration in the
switch startup configuration file by using the copy running-config startup-config privileged EXEC
command. VTP version 3 saves extended-range VLANs in the VLAN database.
Note Before you create an extended-range VLAN, you can verify that the VLAN ID is not used internally by
entering the show vlan internal usage privileged EXEC command. If the VLAN ID is used internally
and you want to free it up, go to the“Creating an Extended-Range VLAN with an Internal VLAN ID”
section on page 1-13 before creating the extended-range VLAN.
Beginning in privileged EXEC mode, follow these steps to create an extended-range VLAN:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
vtp mode transparent Configure the switch for VTP transparent mode, disabling VTP.
Note This step is not required for VTP version 3.
Step 3
vlan vlan-id Enter an extended-range VLAN ID and enter VLAN configuration mode.
The range is 1006 to 4094.
Step 4
mtu mtu-size (Optional) Modify the VLAN by changing the MTU size.
Note Although all VLAN commands appear in the CLI help, only the
mtu mtu-size, private-vlan, and remote-span commands are
supported for extended-range VLANs.
Step 5
remote-span (Optional) Configure the VLAN as the RSPAN VLAN. See the
“Configuring a VLAN as an RSPAN VLAN” section on page 1-18.
Step 6
end Return to privileged EXEC mode.
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