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Chapter 11
Configuring VLANs
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Caution
The FlexWAN modules and routed ports automatically allocate a sequential block of internal VLANs
starting at VLAN 1006. If you use these devices, you must allow the required number of VLANs for
them. If not enough VLANs are available for the FlexWAN module, some ports may not work. Refer to
the Catalyst 6500 Series and Cisco 7600 Series Router FlexWAN Module Installation and Configuration
Note for more information.
If you move a FlexWAN module from one slot to another on the same switch, it will allocate another
Caution
block of VLANs without deleting the previous block. You should reboot the switch if you move the
FlexWAN module.
Creating Extended-Range VLANs
To create the extended-range VLANs, you must first enable MAC address reduction, which provides the
IDs for the extended-range VLANs. After you enable MAC address reduction, you cannot disable it as
long as any extended-range VLANs exist.
If you wish to use the extended-range VLANs and you have existing 802.1Q-to-ISL mappings in your
Note
system, you must delete the mappings. See the
page 11-10
With software release 8.1(1) and later releases, you can name the extended-range VLANs. This
Note
capability is independent of any VTP version or mode.
To enable MAC address reduction and create an Ethernet VLAN in the extended range, perform this task
in privileged mode:
Task
Step 1
Enable MAC address reduction.
Step 2
Create a VLAN.
Step 3
Verify the VLAN configuration.
OL-8978-04
You can configure the private VLAN parameters and RSPAN for the extended-range VLANs;
however, all other parameters for the extended-range VLANs use the system defaults only.
The switch may allocate a block of VLANs from the extended range for internal purposes; for
example, the switch may allocate the VLANs for the routed ports or FlexWAN modules. The block
of VLANs is always allocated starting from VLAN 1006 up. If you have any VLANs within the
range that are required by the FlexWAN module, all of the VLANs that are required will not be
allocated, because the VLANs are never allocated from the user's VLAN area.
for more information.
"Deleting 802.1Q-to-ISL VLAN Mappings" section on
Command
set spantree macreduction {enable | disable}
set vlan vlan
show vlan [vlan]
Catalyst 6500 Series Switch Software Configuration Guide—Release 8.7
Configuring Extended-Range VLANs on the Switch
11-7
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