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Assigning a unique range of VLAN IDs to each client can exceed the limit of 4096 VLANs. The 802.1Q-in-Q VLAN tag feature encapsulates the 802.1Q VLAN tagging within another 802.1Q VLAN tag. The outer tag is assigned according to the AP group, and the inner VLAN ID is assigned dynamically by the AAA server.
802.1Q-in-Q VLAN tagging is supported only on Cisco 5500 Series Wireless LAN Controllers, Cisco 8500 Series Wireless LAN Controllers, and Cisco WiSM2.
You cannot enable multicast until you disable IGMP snooping.
802.1Q-in-Q VLAN tagging is supported only on Layer 2 and Layer 3 intra-Controller roaming, and Layer 2 inter-Controller roaming. Layer 3 inter-Controller roaming is not supported.
0x8100 is the only supported value for the EtherType field of the 802.1Q-in-Q Ethernet frame.
You can enable 802.1Q-in-Q VLAN tagging only on centrally switched packets.
You can enable only IPv4 DHCP packets and not IPv6 DHCP packets for 802.1Q-in-Q VLAN tagging.
The IETF attribute which is a tunnel-type is required to override the C-VLAN.
C-VLAN can be set with tunnel-private-group-ID /tunnel-type and tunnel-private-group-id.