Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release.
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Prerequisites for VLAN Groups
A VLAN should be present in the switch to be able to add it to the VLAN group.
Restrictions for VLAN Groups
The number of VLANs mapped to a VLAN group is not limited by Cisco IOS Software Release. But if the number of VLANs in a VLAN group exceed the recommended value of 32, the mobility behavior is unexpected and in the VLAN group, L2 multicast breaks for some VLANs. So it is the responsibility of the administrator to configure feasible number of VLANs in a VLAN group. When a VLAN is added to a VLAN group mapped to a WLAN which already has 32 VLANs, a warning is generated. But when a new VLAN group is mapped to a WLAN with more than 32 VLANs, an error is generated.
For expected behavior of the VLAN group, the VLANs mapped in the group must be present in the switch. The static IP client behavior is not supported.
Information About VLAN Groups
Whenever a wireless client connects to a wireless network (WLAN), the client is placed in a VLAN that is associated with the WLAN. In a large venue such as an auditorium, a stadium, or a conference room where there are numerous wireless clients, having only a single WLAN to accommodate many clients might be a challenge.
The VLAN group feature uses a single WLAN that can support multiple VLANs. The clients can get assigned to one of the configured VLANs. This feature maps a WLAN to a single VLAN or multiple VLANs using the VLAN groups. When a wireless client associates to the WLAN, the VLAN is derived by an algorithm based on the MAC address of the wireless client. A VLAN is assigned to the client and the client gets the IP address from the assigned VLAN. This feature also extends the current AP group architecture and AAA override architecture, where the AP groups and AAA override can override a VLAN or a VLAN group to which the WLAN is mapped.
Switch(config)#vlan group vlangrp1 vlan-list 91-95
Creates a VLAN
group with the given group name (vlangrp1) and adds all the VLANs listed in the
command. The VLAN list ranges from 1 to 4096 and the recommended number of
VLANs in a group is 32.
Step 3
end
Example:
Switch(config)#end
Exits the global
configuration mode and returns to privileged EXEC mode. Alternatively, press
CTRL-Z to
exit the global configuration mode.
Switch(config)#vlan group vlangrp1 vlan-list 91-95
Creates a VLAN group with the given group name (vlangrp1) and adds
all the VLANs listed in the command. The VLAN list ranges from 1 to 4096 and
the recommended number of VLANs in a group is 32.
Step 3
no vlan group
WORDvlan-listvlan-ID
Example:
Switch(config)#no vlan group vlangrp1 vlan-list 91-95
Removes the VLAN group with the given group name (vlangrp1).
Step 4
end
Example:
Switch(config)#end
Exits the global configuration mode and returns to privileged EXEC
mode. Alternatively, press
CTRL-Z to exit the global
configuration mode.
Creating VLAN Groups (GUI)
To create a VLAN group using the switch web UI, you must:
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