H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 481)

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Configuring an IACTP tunnel and WLAN
roaming
Support for this feature depends on the device model. For more information, see " About the H3C Access
Controllers Web-Based Configuration Guide ."
For a client to remain in the same VLAN during WLAN roaming, enable MAC VLAN.
IACTP tunnel
The Inter AC Tunneling Protocol (IACTP) is an H3C-proprietary protocol that provides a generic packet
encapsulation and transport mechanism for ACs to securely communicate with each other.
IACTP provides a control tunnel to exchange control messages, and a data tunnel to transmit data
packets between ACs. IACTP supports both IPv4 and IPv6.
WLAN roaming, AC backup, and AC-BAS collaboration must support IACTP for inter-AC
communication.
WLAN roaming overview
WLAN roaming enables clients to roam between ACs in a mobility group or within an AC. ACs in a
mobility group communicate with each other through IACTP tunnels.
When a client supporting fast roaming associates with one of the ACs in a mobility group for the first time,
the AC (called the HA) performs 802.1X authentication and 11 Key exchange for the client. The client
information is synchronized across ACs in the mobility group. When this client roams to another AC in
the mobility group (called the FA), the FA uses stored client information to fast authenticate the client by
skipping 802.1X authentication, and performing only 802.11 key exchange and associates with the
client.
Configuring an IACTP tunnel
IMPORTANT:
Roaming group configuration is available only for inter-AC roaming. For the configuration example of
inter-AC roaming, see "
Inter-AC roaming configuration example ."
1. Select Roam > Roam Group from the navigation tree.