How to configure roaming on an AC

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By default, the AC supports intra-AC roaming, which can be implemented as long as the basic WLAN services are configured and the source and destination APs have the same SSID and security policy.
To implement inter-AC roaming, you need to configure the master controller, mobility group, and home agent.
Note the following points when configuring WLAN roaming:
1. Two APs must use the same SSID and security profile.
2. In the direct forwarding mode, services of a roaming user may be interrupted for a short period because ARP entries of the access device connected to an AP do not age in time. To prevent this problem, run the learn client ip-address enable command in the VAP profile view on the AC to enable STA IP address learning. This function enablesAPs to promptly send gratuitous ARP packets to the access device for ARP entry updates, so that user services will not be interrupted during roaming. By default, STA IP address learning is enabled.
3. A maximum of 16 ACs can be added to a mobility group. An AC can be added only to one mobility group.
4. ACs in the same mobility group must use the same software version, otherwise inter-AC roaming may fail.
5. In dual-link hot standby (HSB) scenarios, roaming between active and standby ACs is not supported. Service interruption may occur if users roam in this scenario.

Other related questions:
How to display the roaming trace on an AC
After STA roaming, run the display station roam-track command to on the AC to display the roaming trace of the STA.

How to configure key negotiation between STAs and APs for roaming
Key negotiation between STAs and APs can only be configured in V200R003. The configuration procedure is as follows: [AC-wlan-view] ap-profile name huawei id 1 //Create AP profile huawei. [AC-wlan-ap-prof-huawei] 4-way-handshake ap //Configure key negotiation between a STA and an AP. [AC-wlan-ap-prof-huawei] quit [AC-wlan-view] ap id 1 [AC-wlan-ap-1] profile-id 1 [AC-wlan-ap-1] quit [AC-wlan-view] commit ap 1 //Deliver the configuration to the AP. Warning: Committing configuration may cause service interruption,continue?[Y/N]y

WLAN roaming
WLAN roaming allows STAs to move within the coverage areas of APs belonging to the same ESS with nonstop service transmission. The most obvious advantage of WLAN networks is that a STA can move within a WLAN network without physical media restrictions. WLAN roaming allows STAs to move within a WLAN network without service interruption. An ESS includes multiple APs. When a STA moves from an AP to another, WLAN roaming ensures seamless transition of STA services between APs. WLAN roaming has the following advantages: - Retains STAs' IP addresses. After roaming, STAs can still access the initially associated WLAN network and retain their services. - Avoids packet loss or service interruption caused by long-term authentication.

How to configure combined authentication on an AC
ACs and Fat APs do not support combined authentication. In combined authentication, MAC address authentication, 802.1x authentication, and Portal authentication are uniformly deployed on interfaces connected to users, so that users can select a proper authentication mode to connect to the network.

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