H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 352)

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WLAN roaming configuration
The Inter AC Tunneling Protocol (IACTP) is a proprietary protocol of H3C which defines how access
controllers (ACs) communicate with each other. IACTP provides a generic packet encapsulation and
transport mechanism between ACs to provide secure AC-AC communications based on the standard TCP
client/server model.
A mobility group is a group of ACs that communicate with each other using the IACTP protocol. A
maximum of 8 ACs can be present in a mobility group in current version. Formation and maintenance of
a mobility group is done using IACTP.
IACTP provides a control tunnel for applications such as roaming to share/exchange messages. It also
provides a data tunnel to encapsulate data packets to be transported between ACs. It can be used either
with IPv4 or with IPv6.
Whenever a station supporting key caching associates to any of the ACs in a mobility group (which
would be its Home-AC (HA)) for the first time, it goes through 802.1X authentication followed by 11 Key
exchange. The station information is synchronized across the ACs in the mobility group prior to the
roaming of the station within an AC/across ACs. When this station roams to another AC in the mobility
group (which would be its Foreign-AC (FA)), the station information is used to fast authenticate the station
by skipping 802.1X authentication, and performing only 802.11 key exchange to facilitate seamless
roaming within the mobility group.
Configuring WLAN roaming
Configuring a roaming group
NOTE:
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.
Figure 368 Configuring a roaming group
2. Configure a roaming group as described in Table 111 .
3. Click Apply.